ADTN

SEC source: 0000926282-21-000004 · primary_doc.xml · derivative · entry 4

Walker Kathryn A · CIK 0001264261 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 318.161 shares

Expires not disclosed

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.

F1 · derivative.exercise_price: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

F1 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

F1 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

SEC source: 0000926282-21-000004 · primary_doc.xml · nonDerivative · entry 3

Walker Kathryn A · CIK 0001264261 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,386

F2 · security: Represents restricted stock award grant that vests in full on the first anniversary of the date of grant.

SEC source: 0000926282-21-000004 · primary_doc.xml · nonDerivative · entry 2

Walker Kathryn A · CIK 0001264261 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,292

F1 · security: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

SEC source: 0000926282-21-000004 · primary_doc.xml · nonDerivative · entry 1

Walker Kathryn A · CIK 0001264261 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 37,292.161

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.

F1 · price: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

SEC source: 0000926282-21-000003 · primary_doc.xml · derivative · entry 4

Nair Balan · CIK 0001398905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 318.161 shares

Expires not disclosed

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.

F1 · derivative.exercise_price: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

F1 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

F1 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

SEC source: 0000926282-21-000003 · primary_doc.xml · nonDerivative · entry 3

Nair Balan · CIK 0001398905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 65,323

F2 · security: Represents restricted stock award grant that vests in full on the first anniversary of the date of grant.

SEC source: 0000926282-21-000003 · primary_doc.xml · nonDerivative · entry 2

Nair Balan · CIK 0001398905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 59,229

F1 · security: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

SEC source: 0000926282-21-000003 · primary_doc.xml · nonDerivative · entry 1

Nair Balan · CIK 0001398905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 59,229.161

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.

F1 · price: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

SEC source: 0000926282-21-000002 · primary_doc.xml · derivative · entry 4

HUSS H FENWICK · CIK 0001201037 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 318.161 shares

Expires not disclosed

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.

F1 · derivative.exercise_price: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

F1 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

F1 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

SEC source: 0000926282-21-000002 · primary_doc.xml · nonDerivative · entry 3

HUSS H FENWICK · CIK 0001201037 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 52,323

F2 · security: Represents restricted stock award grant that vests in full on the first anniversary of the date of grant.

SEC source: 0000926282-21-000002 · primary_doc.xml · nonDerivative · entry 2

HUSS H FENWICK · CIK 0001201037 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,229

F1 · security: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

SEC source: 0000926282-21-000002 · primary_doc.xml · nonDerivative · entry 1

HUSS H FENWICK · CIK 0001201037 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 46,229.161

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.

F1 · price: Settlement of dividend equivalent rights in connection with lapse of restriction on restricted stock. The rights accrued when and as dividends were paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the economic equivalent of one share of the Company's common stock.

SEC source: 0000926282-20-000040 · primary_doc.xml · derivative · entry 1

NICHOLS ROY J · CIK 0000937725 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 318.161

Underlying: Common Stock · 64.783 shares

Expires not disclosed

F1 · derivative.exercise_price: Settlement of dividend equivalent rights in connection with the vesting of restricted stock units. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F1 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock units. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F1 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock units. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

SEC source: 0000926282-20-000052 · primary_doc.xml · derivative · entry 5

Foliano Michael · CIK 0001300513 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,538.946

Underlying: Common Stock · 120.597 shares

Expires not disclosed

F3 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of common stock at the cash value thereof.

F4 · derivative.exercise_date: The phantom stock becomes payable six months after the reporting person's separation of service with the Company. The reporting person may transfer the phantom stock account into an alternative investment at any time.

F4 · derivative.expiration_date: The phantom stock becomes payable six months after the reporting person's separation of service with the Company. The reporting person may transfer the phantom stock account into an alternative investment at any time.

SEC source: 0000926282-20-000052 · primary_doc.xml · nonDerivative · entry 3

Foliano Michael · CIK 0001300513 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · 401(k) Plan

Disclosed balance after: 241.443

F2 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

SEC source: 0000926282-20-000052 · primary_doc.xml · nonDerivative · entry 2

Foliano Michael · CIK 0001300513 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,164.63

F2 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

SEC source: 0000926282-20-000051 · primary_doc.xml · derivative · entry 6

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,729.578

Underlying: Common Stock · 115.368 shares

Expires not disclosed

F2 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

F3 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of common stock at the cash value thereof.

F4 · derivative.exercise_date: The phantom stock becomes payable six months after the reporting person's separation of service with the Company. The reporting person may transfer the phantom stock account into an alternative investment at any time.

F4 · derivative.expiration_date: The phantom stock becomes payable six months after the reporting person's separation of service with the Company. The reporting person may transfer the phantom stock account into an alternative investment at any time.

SEC source: 0000926282-20-000051 · primary_doc.xml · nonDerivative · entry 4

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Indirect · 401(k) Plan

Disclosed balance after: 4,009.26

F2 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

SEC source: 0000926282-20-000051 · primary_doc.xml · nonDerivative · entry 3

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,049

F2 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

SEC source: 0000926282-20-000050 · primary_doc.xml · nonDerivative · entry 1

Scheiterer Eduard · CIK 0001628537 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,597.13

F1 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

SEC source: 0000926282-20-000049 · primary_doc.xml · nonDerivative · entry 1

Harris Ray · CIK 0001766181 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,479.464

F1 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

SEC source: 0000926282-20-000048 · primary_doc.xml · nonDerivative · entry 1

Centis Ronald · CIK 0001769038 · SVP, Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,985.257

F1 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

SEC source: 0000926282-20-000047 · primary_doc.xml · derivative · entry 5

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 99,516.977

Underlying: Common Stock · 686.271 shares

Expires not disclosed

F2 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

F3 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of common stock at the cash value thereof.

F4 · derivative.exercise_date: The phantom stock becomes payable six months after the reporting person's separation of service with the Company. The reporting person may transfer the phantom stock account into an alternative investment at any time.

F4 · derivative.expiration_date: The phantom stock becomes payable six months after the reporting person's separation of service with the Company. The reporting person may transfer the phantom stock account into an alternative investment at any time.

SEC source: 0000926282-20-000047 · primary_doc.xml · nonDerivative · entry 3

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 285,213.78

F2 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

SEC source: 0000926282-20-000045 · primary_doc.xml · derivative · entry 2

McCray Gregory James · CIK 0001327057 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 318.161

Underlying: Common Stock · 64.783 shares

Expires not disclosed

F2 · derivative.exercise_price: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F2 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F2 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

SEC source: 0000926282-20-000045 · primary_doc.xml · nonDerivative · entry 1

McCray Gregory James · CIK 0001327057 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 25,233.217

F1 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

SEC source: 0000926282-20-000044 · primary_doc.xml · derivative · entry 1

Jacqueline Hourigan Rice · CIK 0001637150 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 318.161

Underlying: Common Stock · 64.783 shares

Expires not disclosed

F1 · derivative.exercise_price: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F1 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F1 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

SEC source: 0000926282-20-000043 · primary_doc.xml · derivative · entry 1

Walker Kathryn A · CIK 0001264261 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 318.161

Underlying: Common Stock · 64.783 shares

Expires not disclosed

F1 · derivative.exercise_price: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F1 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F1 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

SEC source: 0000926282-20-000042 · primary_doc.xml · derivative · entry 1

Nair Balan · CIK 0001398905 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 318.161

Underlying: Common Stock · 64.783 shares

Expires not disclosed

F1 · derivative.exercise_price: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F1 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F1 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

SEC source: 0000926282-20-000041 · primary_doc.xml · derivative · entry 1

HUSS H FENWICK · CIK 0001201037 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 318.161

Underlying: Common Stock · 64,783 shares

Expires not disclosed

F1 · derivative.exercise_price: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F1 · derivative.exercise_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

F1 · derivative.expiration_date: Settlement of dividend equivalent rights in connection with the vesting of restricted stock grant. The rights accrue when and as dividends are paid on the Company's common stock and are paid in whole shares of common stock with the remainder paid in cash. Each dividend equivalent right is the equivalent of one share of the Company's common stock.

SEC source: 0000926282-21-000038 · primary_doc.xml · nonDerivative · entry 1

Kimpe Marc · CIK 0001770330 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,725.624

F1 · security: Reflects shares acquired through the automatic reinvestment of dividends paid on the Company's common stock.

SEC source: 0000926282-20-000032 · primary_doc.xml · nonDerivative · entry 1

Harris Ray · CIK 0001766181 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,671

SEC source: 0000926282-20-000039 · primary_doc.xml · derivative · entry 2

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,639.21

Underlying: Common Stock · 4,025 shares

Expires not disclosed

F2 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of common stock or the cash value thereof.

F4 · price: Upon vesting of performance shares awarded pursuant to a grant of November 11, 2017 under the ADTRAN, Inc. 2015 Employee Stock Incentive Plan, the reporting person deferred the receipt of shares of the Company's common stock and received instead shares of phantom stock pursuant to the Company's deferred compensation plan.

F3 · derivative.exercise_date: The phantom stock becomes payable 6 months after the reporting person's separation of service with the Company. The reporting person may transfer his phantom stock account into an alternative investment at any time.

F3 · derivative.expiration_date: The phantom stock becomes payable 6 months after the reporting person's separation of service with the Company. The reporting person may transfer his phantom stock account into an alternative investment at any time.

SEC source: 0000926282-20-000039 · primary_doc.xml · nonDerivative · entry 1

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,180

F1 · security: Represents a grant of restricted stock units that vest in four equal and annual installments beginning on the first anniversary date of the grant.

SEC source: 0000926282-20-000038 · primary_doc.xml · derivative · entry 2

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 117,532.706

Underlying: Common Stock · 18,702 shares

Expires not disclosed

F2 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of common stock or the cash value thereof.

F4 · price: Upon vesting of performance shares awarded pursuant to a grant of November 11, 2017 under the ADTRAN, Inc. 2015 Employee Stock Incentive Plan, the reporting person deferred the receipt of shares of the Company's common stock and received instead shares of phantom stock pursuant to the Company's deferred compensation plan.

F3 · derivative.exercise_date: The phantom stock becomes payable 6 months after the reporting person's separation of service with the Company. The reporting person may transfer his phantom stock account into an alternative investment at any time.

F3 · derivative.expiration_date: The phantom stock becomes payable 6 months after the reporting person's separation of service with the Company. The reporting person may transfer his phantom stock account into an alternative investment at any time.

SEC source: 0000926282-20-000038 · primary_doc.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 274,683

F1 · security: Represents a grant of restricted stock units that vest in four equal and annual installments beginning on the first anniversary date of the grant.

SEC source: 0000926282-20-000037 · primary_doc.xml · nonDerivative · entry 2

Scheiterer Eduard · CIK 0001628537 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 32,316

F2 · security: Represents a grant of restricted stock units that vest in four equal and annual installments beginning on the first anniversary date of the grant.

SEC source: 0000926282-20-000037 · primary_doc.xml · nonDerivative · entry 1

Scheiterer Eduard · CIK 0001628537 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,806

F1 · security: Represents vesting of performance shares awarded pursuant to a grant on November 11, 2017 under the ADTRAN, Inc. 2015 Employee Stock Incentive Plan.

SEC source: 0000926282-20-000036 · primary_doc.xml · nonDerivative · entry 2

Foliano Michael · CIK 0001300513 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 45,040

F2 · security: Represents a grant of restricted stock units that vest in four equal and annual installments beginning on the first anniversary date of the grant.

SEC source: 0000926282-20-000036 · primary_doc.xml · nonDerivative · entry 1

Foliano Michael · CIK 0001300513 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,695

F1 · security: Represents vesting of performance shares awarded pursuant to a grant on November 11, 2017 under the ADTRAN, Inc. 2015 Employee Stock Incentive Plan.

SEC source: 0000926282-20-000035 · primary_doc.xml · nonDerivative · entry 1

Kimpe Marc · CIK 0001770330 · SVP, Research & Development

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 24,697

F1 · security: Represents a grant of restricted stock units that vest in four equal and annual installments beginning on the first anniversary date of the grant.

SEC source: 0000926282-20-000033 · primary_doc.xml · nonDerivative · entry 1

Centis Ronald · CIK 0001769038 · SVP, Operations

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 21,982.76

F1 · security: Represents a grant of restricted stock units that vest in four equal and annual installments beginning on the first anniversary date of the grant.

SEC source: 0000926282-20-000034 · primary_doc.xml · nonDerivative · entry 1

Harris Ray · CIK 0001766181 · Chief Information Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,477.1

F1 · security: Represents a grant of restricted stock units that vest in four equal and annual installments beginning on the first anniversary date of the grant.

SEC source: 0000926282-20-000052 · primary_doc.xml · derivative · entry 4

Foliano Michael · CIK 0001300513 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 20,418.349

Underlying: Common Stock · 3,051 shares

Expires not disclosed

F1 · security: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 3,051 shares of common stock on November 16, 2020, which shares should have been reported as the acquisition of shares of Phantom stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

F3 · derivative.exercise_price: Each share of phantom stock represents a right to receive one share of common stock at the cash value thereof.

F4 · derivative.exercise_date: The phantom stock becomes payable six months after the reporting person's separation of service with the Company. The reporting person may transfer the phantom stock account into an alternative investment at any time.

F4 · derivative.expiration_date: The phantom stock becomes payable six months after the reporting person's separation of service with the Company. The reporting person may transfer the phantom stock account into an alternative investment at any time.

SEC source: 0000926282-20-000052 · primary_doc.xml · nonDerivative · entry 1

Foliano Michael · CIK 0001300513 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 44,144

F1 · security: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 3,051 shares of common stock on November 16, 2020, which shares should have been reported as the acquisition of shares of Phantom stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

F1 · shares: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 3,051 shares of common stock on November 16, 2020, which shares should have been reported as the acquisition of shares of Phantom stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

F1 · balance_after: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 3,051 shares of common stock on November 16, 2020, which shares should have been reported as the acquisition of shares of Phantom stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

SEC source: 0000926282-20-000051 · primary_doc.xml · derivative · entry 5

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,614.21

Underlying: Common Stock · 0 shares

Expires not disclosed

F1 · derivative.exercise_price: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 4,025 shares of phantom stock on November 16, 2020, which shares should have been reported as the acquisition of shares of common stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

F1 · shares: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 4,025 shares of phantom stock on November 16, 2020, which shares should have been reported as the acquisition of shares of common stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

F1 · derivative.exercise_date: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 4,025 shares of phantom stock on November 16, 2020, which shares should have been reported as the acquisition of shares of common stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

F1 · derivative.expiration_date: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 4,025 shares of phantom stock on November 16, 2020, which shares should have been reported as the acquisition of shares of common stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

F1 · derivative.underlying_shares: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 4,025 shares of phantom stock on November 16, 2020, which shares should have been reported as the acquisition of shares of common stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

F1 · balance_after: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 4,025 shares of phantom stock on November 16, 2020, which shares should have been reported as the acquisition of shares of common stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

SEC source: 0000926282-20-000051 · primary_doc.xml · nonDerivative · entry 2

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 41,023

SEC source: 0000926282-20-000051 · primary_doc.xml · nonDerivative · entry 1

Wilson James Denson Jr · CIK 0001371377 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,205

F1 · security: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 4,025 shares of phantom stock on November 16, 2020, which shares should have been reported as the acquisition of shares of common stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

SEC source: 0000926282-20-000047 · primary_doc.xml · nonDerivative · entry 1

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

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 293,385

F1 · security: On November 18, 2020, the reporting person filed a Form 4 incorrectly reporting the acquisition of 18,702 shares of phantom stock on November 16, 2020, which shares should have been reported as the acquisition of shares of common stock. In addition to correcting such transaction, this amendment shows the correct number of shares of common stock (as outlined in Table I) and phantom stock (as outlined in Table II) owned by the reporting person after such transaction.

SEC source: 0000926282-21-000019 · primary_doc.xml · nonDerivative · entry 1

Foliano Michael · CIK 0001300513 · CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 42,010.88

F1 · security: On December 3, 2020, the reporting person filed a Form 4 incorrectly reporting the amount of securities beneficially owned. This amendment shows the correct number of shares of common stock owned by the reporting person.

F1 · balance_after: On December 3, 2020, the reporting person filed a Form 4 incorrectly reporting the amount of securities beneficially owned. This amendment shows the correct number of shares of common stock owned by the reporting person.