ADTN

SEC source: 0000926282-22-000045 · primary_doc.xml · nonDerivative · entry 2

Foliano Michael · CIK 0001300513 · SVP of Finance & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 151,545.366

F1 · kind: Represents shares surrendered to Adtran Holdings, Inc. to cover the exercise price of outstanding stock options. The reporting person received 1,304 shares of common stock on the net exercise of stock options to purchase 4,516 shares of common stock. The reporting person surrendered 3,212 shares of common stock underlying the stock options for payment of the exercise price, using the closing stock price on August 8, 2022 of $23.86, pursuant to the terms of the 2006 Employee Stock Incentive Plan.

SEC source: 0000926282-22-000045 · primary_doc.xml · nonDerivative · entry 1

Foliano Michael · CIK 0001300513 · SVP of Finance & CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 154,757.366

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001209191-22-042915 · doc4.xml · derivative · entry 7

Protiva Brian · CIK 0001930886 · Director · CEO of ADVA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,668

Underlying: Common Stock · 17,668 shares

Expires 2023-05-14

F1 · kind: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022. In connection therewith, on July 20, 2022, the reporting person's options to purchase shares of ADVA's common stock outstanding immediately prior to the Closing Date ("ADVA Options") converted into options to purchase shares of the Issuer's common stock ("Issuer Options"), at a ratio of 1 ADVA Option to 0.8244 Issuer Options (such ratio, the "Exchange Ratio"), rounded down to the nearest whole share, and at an exercise price equal to the original ADVA Option exercise price divided by the Exchange Ratio and multiplied by the FX rate on the Closing Date, rounded up to the nearest cent.

F1 · price: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022. In connection therewith, on July 20, 2022, the reporting person's options to purchase shares of ADVA's common stock outstanding immediately prior to the Closing Date ("ADVA Options") converted into options to purchase shares of the Issuer's common stock ("Issuer Options"), at a ratio of 1 ADVA Option to 0.8244 Issuer Options (such ratio, the "Exchange Ratio"), rounded down to the nearest whole share, and at an exercise price equal to the original ADVA Option exercise price divided by the Exchange Ratio and multiplied by the FX rate on the Closing Date, rounded up to the nearest cent.

SEC source: 0001209191-22-042915 · doc4.xml · derivative · entry 6

Protiva Brian · CIK 0001930886 · Director · CEO of ADVA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 61,830

Underlying: Common Stock · 61,830 shares

Expires 2025-05-14

F1 · kind: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022. In connection therewith, on July 20, 2022, the reporting person's options to purchase shares of ADVA's common stock outstanding immediately prior to the Closing Date ("ADVA Options") converted into options to purchase shares of the Issuer's common stock ("Issuer Options"), at a ratio of 1 ADVA Option to 0.8244 Issuer Options (such ratio, the "Exchange Ratio"), rounded down to the nearest whole share, and at an exercise price equal to the original ADVA Option exercise price divided by the Exchange Ratio and multiplied by the FX rate on the Closing Date, rounded up to the nearest cent.

F1 · price: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022. In connection therewith, on July 20, 2022, the reporting person's options to purchase shares of ADVA's common stock outstanding immediately prior to the Closing Date ("ADVA Options") converted into options to purchase shares of the Issuer's common stock ("Issuer Options"), at a ratio of 1 ADVA Option to 0.8244 Issuer Options (such ratio, the "Exchange Ratio"), rounded down to the nearest whole share, and at an exercise price equal to the original ADVA Option exercise price divided by the Exchange Ratio and multiplied by the FX rate on the Closing Date, rounded up to the nearest cent.

SEC source: 0001209191-22-042915 · doc4.xml · derivative · entry 5

Protiva Brian · CIK 0001930886 · Director · CEO of ADVA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,220

Underlying: Common Stock · 41,220 shares

Expires 2027-05-14

F1 · kind: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022. In connection therewith, on July 20, 2022, the reporting person's options to purchase shares of ADVA's common stock outstanding immediately prior to the Closing Date ("ADVA Options") converted into options to purchase shares of the Issuer's common stock ("Issuer Options"), at a ratio of 1 ADVA Option to 0.8244 Issuer Options (such ratio, the "Exchange Ratio"), rounded down to the nearest whole share, and at an exercise price equal to the original ADVA Option exercise price divided by the Exchange Ratio and multiplied by the FX rate on the Closing Date, rounded up to the nearest cent.

F1 · price: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022. In connection therewith, on July 20, 2022, the reporting person's options to purchase shares of ADVA's common stock outstanding immediately prior to the Closing Date ("ADVA Options") converted into options to purchase shares of the Issuer's common stock ("Issuer Options"), at a ratio of 1 ADVA Option to 0.8244 Issuer Options (such ratio, the "Exchange Ratio"), rounded down to the nearest whole share, and at an exercise price equal to the original ADVA Option exercise price divided by the Exchange Ratio and multiplied by the FX rate on the Closing Date, rounded up to the nearest cent.

SEC source: 0001209191-22-042915 · doc4.xml · derivative · entry 4

Protiva Brian · CIK 0001930886 · Director · CEO of ADVA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,464

Underlying: Common Stock · 49,464 shares

Expires 2028-05-14

F1 · kind: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022. In connection therewith, on July 20, 2022, the reporting person's options to purchase shares of ADVA's common stock outstanding immediately prior to the Closing Date ("ADVA Options") converted into options to purchase shares of the Issuer's common stock ("Issuer Options"), at a ratio of 1 ADVA Option to 0.8244 Issuer Options (such ratio, the "Exchange Ratio"), rounded down to the nearest whole share, and at an exercise price equal to the original ADVA Option exercise price divided by the Exchange Ratio and multiplied by the FX rate on the Closing Date, rounded up to the nearest cent.

F1 · price: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022. In connection therewith, on July 20, 2022, the reporting person's options to purchase shares of ADVA's common stock outstanding immediately prior to the Closing Date ("ADVA Options") converted into options to purchase shares of the Issuer's common stock ("Issuer Options"), at a ratio of 1 ADVA Option to 0.8244 Issuer Options (such ratio, the "Exchange Ratio"), rounded down to the nearest whole share, and at an exercise price equal to the original ADVA Option exercise price divided by the Exchange Ratio and multiplied by the FX rate on the Closing Date, rounded up to the nearest cent.

SEC source: 0001209191-22-042915 · doc4.xml · derivative · entry 3

Protiva Brian · CIK 0001930886 · Director · CEO of ADVA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 88,326

Underlying: Common Stock · 88,326 shares

Expires 2029-05-14

F1 · kind: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022. In connection therewith, on July 20, 2022, the reporting person's options to purchase shares of ADVA's common stock outstanding immediately prior to the Closing Date ("ADVA Options") converted into options to purchase shares of the Issuer's common stock ("Issuer Options"), at a ratio of 1 ADVA Option to 0.8244 Issuer Options (such ratio, the "Exchange Ratio"), rounded down to the nearest whole share, and at an exercise price equal to the original ADVA Option exercise price divided by the Exchange Ratio and multiplied by the FX rate on the Closing Date, rounded up to the nearest cent.

F1 · price: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022. In connection therewith, on July 20, 2022, the reporting person's options to purchase shares of ADVA's common stock outstanding immediately prior to the Closing Date ("ADVA Options") converted into options to purchase shares of the Issuer's common stock ("Issuer Options"), at a ratio of 1 ADVA Option to 0.8244 Issuer Options (such ratio, the "Exchange Ratio"), rounded down to the nearest whole share, and at an exercise price equal to the original ADVA Option exercise price divided by the Exchange Ratio and multiplied by the FX rate on the Closing Date, rounded up to the nearest cent.

SEC source: 0001209191-22-042587 · doc4.xml · nonDerivative · entry 2

Protiva Brian · CIK 0001930886 · Director · CEO of ADVA

10b5-1 filing: Not disclosed

Ownership: Indirect · By spouse

Disclosed balance after: 19,361.03

F1 · kind: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022 (the "Closing Date"). On the Closing Date, each ADVA share tendered by the reporting person was exchanged for 0.8244 shares of the Issuer's common stock.

F1 · price: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022 (the "Closing Date"). On the Closing Date, each ADVA share tendered by the reporting person was exchanged for 0.8244 shares of the Issuer's common stock.

SEC source: 0001209191-22-042587 · doc4.xml · nonDerivative · entry 1

Protiva Brian · CIK 0001930886 · Director · CEO of ADVA

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 330,609.14

F1 · kind: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022 (the "Closing Date"). On the Closing Date, each ADVA share tendered by the reporting person was exchanged for 0.8244 shares of the Issuer's common stock.

F1 · price: Pursuant to the Business Combination Agreement (the "Business Combination Agreement"), dated August 30, 2021, by and among ADTRAN, Inc.; ADVA Optical Networking SE ("ADVA"); the Issuer (f/k/a Acorn HoldCo, Inc.); and Acorn MergeCo, Inc., the Issuer and ADVA consummated the Exchange Offer (as defined in the Business Combination Agreement) and ADVA became a subsidiary of the Issuer on July 15, 2022 (the "Closing Date"). On the Closing Date, each ADVA share tendered by the reporting person was exchanged for 0.8244 shares of the Issuer's common stock.

SEC source: 0000926282-22-000044 · primary_doc.xml · nonDerivative · entry 1

STANTON THOMAS R · CIK 0001191219 · Director · Chairman, CEO and President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 842,082.09

F1 · security: Represents a grant of restricted stock units ("RSUs") with 75% vesting in 24 months, 6.25% vesting in 27 months, 6.25% vesting in 30 months, 6.25% vesting in 33 months and 6.25% vesting in 36 months following the date of grant.

F2 · balance_after: Includes 648,483 time-based RSUs that settle upon vesting in shares of the Issuer's common stock.

SEC source: 0001209191-22-041659 · doc4.xml · derivative · entry 10

STANTON THOMAS R · CIK 0001191219 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 158,297.672 shares

Expires not disclosed

F2 · derivative.exercise_price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.expiration_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.expiration_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041659 · doc4.xml · derivative · entry 9

STANTON THOMAS R · CIK 0001191219 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 69,473 shares

Expires 2022-11-06

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041659 · doc4.xml · derivative · entry 8

STANTON THOMAS R · CIK 0001191219 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,893 shares

Expires 2022-11-06

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041659 · doc4.xml · derivative · entry 7

STANTON THOMAS R · CIK 0001191219 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 71,136 shares

Expires 2023-11-02

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041659 · doc4.xml · derivative · entry 6

STANTON THOMAS R · CIK 0001191219 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,230 shares

Expires 2023-11-02

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041659 · doc4.xml · derivative · entry 5

STANTON THOMAS R · CIK 0001191219 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 88,936 shares

Expires 2024-11-15

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041659 · doc4.xml · derivative · entry 4

STANTON THOMAS R · CIK 0001191219 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,271 shares

Expires 2024-11-15

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041659 · doc4.xml · derivative · entry 3

STANTON THOMAS R · CIK 0001191219 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 87,864 shares

Expires 2025-11-14

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041659 · doc4.xml · derivative · entry 2

STANTON THOMAS R · CIK 0001191219 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 6,523 shares

Expires 2025-11-14

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041659 · doc4.xml · nonDerivative · entry 1

STANTON THOMAS R · CIK 0001191219 · Director · Chairman and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Includes 111,959 time-based restricted stock units ("RSUs") that settle upon vesting in shares of the Issuer's common stock.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041663 · doc4.xml · derivative · entry 9

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 17,196.473 shares

Expires not disclosed

F2 · derivative.exercise_price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.expiration_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.expiration_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041663 · doc4.xml · derivative · entry 8

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 15,169 shares

Expires 2023-11-02

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041663 · doc4.xml · derivative · entry 7

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,865 shares

Expires 2023-11-02

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041663 · doc4.xml · derivative · entry 6

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 19,772 shares

Expires 2024-11-15

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041663 · doc4.xml · derivative · entry 5

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 5,271 shares

Expires 2024-11-15

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041663 · doc4.xml · derivative · entry 4

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 12,522 shares

Expires 2025-11-14

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041663 · doc4.xml · derivative · entry 3

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 6,260 shares

Expires 2025-11-14

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041663 · doc4.xml · nonDerivative · entry 2

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · 401(k) Plan

Disclosed balance after: 0

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041663 · doc4.xml · nonDerivative · entry 1

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Includes 24,182 time-based restricted stock units ("RSUs") that settle upon vesting in shares of the Issuer's common stock.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041655 · doc4.xml · nonDerivative · entry 1

Nair Balan · CIK 0001398905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Includes 3,943 shares of time-based restricted stock under a restricted stock award (an "RSA") and 35.53 shares of restricted stock acquired in connection with such RSA pursuant to a dividend reinvestment feature of the applicable equity plan.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, each share of the Issuer's common stock converted, on a one-for-one basis, into a share of common stock of Holdings.

SEC source: 0001209191-22-041661 · doc4.xml · nonDerivative · entry 1

Walker Kathryn A · CIK 0001264261 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Includes 3,943 shares of time-based restricted stock under a restricted stock award (an "RSA") and 35.53 shares of restricted stock acquired in connection with such RSA pursuant to a dividend reinvestment feature of the applicable equity plan.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, each share of the Issuer's common stock converted, on a one-for-one basis, into a share of common stock of Holdings.

SEC source: 0001209191-22-041638 · doc4.xml · nonDerivative · entry 1

Harris Ray · CIK 0001766181 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Includes 14,158 time-based restricted stock units ("RSUs") that settle upon vesting in shares of the Issuer's common stock.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock and (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time.

SEC source: 0001209191-22-041657 · doc4.xml · nonDerivative · entry 1

Jacqueline Hourigan Rice · CIK 0001637150 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Includes 3,943 shares of time-based restricted stock under a restricted stock award (an "RSA") and 35.53 shares of restricted stock acquired in connection with such RSA pursuant to a dividend reinvestment feature of the applicable equity plan.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, each share of the Issuer's common stock converted, on a one-for-one basis, into a share of common stock of Holdings.

SEC source: 0001209191-22-041652 · doc4.xml · nonDerivative · entry 1

McCray Gregory James · CIK 0001327057 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Includes 3,943 shares of time-based restricted stock under a restricted stock award (an "RSA") and 35.53 shares of restricted stock acquired in connection with such RSA pursuant to a dividend reinvestment feature of the applicable equity plan.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, each share of the Issuer's common stock converted, on a one-for-one basis, into a share of common stock of Holdings.

SEC source: 0001209191-22-041625 · doc4.xml · derivative · entry 4

Conger Robert · CIK 0001844323 · SVP, Technology & Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,000 shares

Expires 2023-11-02

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

SEC source: 0001209191-22-041625 · doc4.xml · derivative · entry 3

Conger Robert · CIK 0001844323 · SVP, Technology & Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,600 shares

Expires 2024-11-15

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

SEC source: 0001209191-22-041625 · doc4.xml · derivative · entry 2

Conger Robert · CIK 0001844323 · SVP, Technology & Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,900 shares

Expires 2025-11-14

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

SEC source: 0001209191-22-041625 · doc4.xml · nonDerivative · entry 1

Conger Robert · CIK 0001844323 · SVP, Technology & Strategy

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Includes 12,109 time-based restricted stock units ("RSUs") that settle upon vesting in shares of the Issuer's common stock.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

SEC source: 0001209191-22-041648 · doc4.xml · derivative · entry 7

Kimpe Marc · CIK 0001770330 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 1,200 shares

Expires 2023-11-02

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

SEC source: 0001209191-22-041648 · doc4.xml · derivative · entry 6

Kimpe Marc · CIK 0001770330 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,600 shares

Expires 2023-11-02

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

SEC source: 0001209191-22-041648 · doc4.xml · derivative · entry 5

Kimpe Marc · CIK 0001770330 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 2,686 shares

Expires 2024-11-15

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

SEC source: 0001209191-22-041648 · doc4.xml · derivative · entry 4

Kimpe Marc · CIK 0001770330 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 9,314 shares

Expires 2024-11-15

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

SEC source: 0001209191-22-041648 · doc4.xml · derivative · entry 3

Kimpe Marc · CIK 0001770330 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 6,579 shares

Expires 2025-11-14

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

SEC source: 0001209191-22-041648 · doc4.xml · derivative · entry 2

Kimpe Marc · CIK 0001770330 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 7,221 shares

Expires 2025-11-14

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

SEC source: 0001209191-22-041648 · doc4.xml · nonDerivative · entry 1

Kimpe Marc · CIK 0001770330 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Includes 15,659 time-based restricted stock units ("RSUs") that settle upon vesting in shares of the Issuer's common stock.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) and (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time.

SEC source: 0001209191-22-041643 · doc4.xml · nonDerivative · entry 1

HUSS H FENWICK · CIK 0001201037 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · shares: Includes 3,943 shares of time-based restricted stock under a restricted stock award (an "RSA") and 35.53 shares of restricted stock acquired in connection with such RSA pursuant to a dividend reinvestment feature of the applicable equity plan.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, each share of the Issuer's common stock converted, on a one-for-one basis, into a share of common stock of Holdings.

SEC source: 0001209191-22-041634 · doc4.xml · derivative · entry 11

Foliano Michael · CIK 0001300513 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 21,112.16 shares

Expires not disclosed

F2 · derivative.exercise_price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.expiration_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.expiration_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041634 · doc4.xml · derivative · entry 10

Foliano Michael · CIK 0001300513 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 13,547 shares

Expires not disclosed

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.expiration_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.expiration_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041634 · doc4.xml · derivative · entry 9

Foliano Michael · CIK 0001300513 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 4,515 shares

Expires not disclosed

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.expiration_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.expiration_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

SEC source: 0001209191-22-041634 · doc4.xml · derivative · entry 8

Foliano Michael · CIK 0001300513 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 12,843 shares

Expires not disclosed

F2 · price: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · price: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.exercise_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.exercise_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.

F2 · derivative.expiration_date: Pursuant to that certain Business Combination Agreement, dated August 30, 2021, by and among the Issuer, ADVA Optical Networking SE, Acorn HoldCo, Inc. (now named ADTRAN Holdings, Inc. ("Holdings")), and Acorn MergeCo, Inc., the Issuer became a wholly owned subsidiary of Holdings on July 8, 2022 (the "Effective Time"). At the Effective Time, (a) each share of the Issuer's common stock converted, on a one-for-one basis, into a share of Holdings' common stock; (b) each RSU measured in shares of the Issuer's common stock, whether vested or unvested, converted, on a one-for-one basis, into an RSU measured in shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding RSU immediately prior to the Effective Time;

F3 · derivative.expiration_date: (Continued from footnote 2) (c) each option to purchase the Issuer's common stock converted, on a one-for-one basis, into an option to purchase shares of Holdings' common stock on the same terms and conditions as were applicable to the corresponding option immediately prior to the Effective Time; and (d) each share of phantom stock of the Issuer (representing the economic equivalent of one share of the Issuer's common stock) converted, on a one-for-one basis, into a share of phantom stock of Holdings on the same terms and conditions as were applicable to the corresponding phantom stock immediately prior to the Effective Time.