CASELLA JOHN W

SEC source: 0001055352-26-000008 · wk-form4_1780436527.xml · nonDerivative · entry 5

CASELLA JOHN W · CIK 0001055352 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · by SLAT 2

Disclosed balance after: 167,800

F3 · kind: Represents a gift of shares to the Spousal Lifetime Access Trust ("SLAT 2") for the benefit of Mr. Casella. Mr. Casella is the trustee of the SLAT 2.

F5 · ownership.nature: Held by the SLAT 2 for the benefit of Mr. Casella. Mr. Casella is the trustee of the SLAT 2.

SEC source: 0001055352-26-000008 · wk-form4_1780436527.xml · nonDerivative · entry 4

CASELLA JOHN W · CIK 0001055352 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 26,300

F3 · kind: Represents a gift of shares to the Spousal Lifetime Access Trust ("SLAT 2") for the benefit of Mr. Casella. Mr. Casella is the trustee of the SLAT 2.

F4 · ownership.nature: Held by Mr. Casella's spouse. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities.

SEC source: 0001055352-26-000008 · wk-form4_1780436527.xml · nonDerivative · entry 3

CASELLA JOHN W · CIK 0001055352 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By SLAT

Disclosed balance after: 170,200

F1 · kind: Represents a gift of shares to the Spousal Lifetime Access Trust ("SLAT") for the benefit of Mr. Casella's spouse. Mr. Casella's spouse is the trustee of the SLAT.

F2 · ownership.nature: Held by the SLAT for the benefit of Mr. Casella's spouse. Mr. Casella's spouse is the trustee of the SLAT. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities.

SEC source: 0001055352-26-000008 · wk-form4_1780436527.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 129,800

F1 · kind: Represents a gift of shares to the Spousal Lifetime Access Trust ("SLAT") for the benefit of Mr. Casella's spouse. Mr. Casella's spouse is the trustee of the SLAT.

SEC source: 0001055352-26-000006 · wk-form4_1773694490.xml · nonDerivative · entry 3

CASELLA JOHN W · CIK 0001055352 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 30,795

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 22, 2023 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $87.77 to $87.85. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0001055352-26-000006 · wk-form4_1773694490.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 32,539

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 22, 2023 and does not represent a discretionary sale by the reporting person.

SEC source: 0001055352-26-000006 · wk-form4_1773694490.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 33,502

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. Amended and Restated 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 12, 2027.

SEC source: 0001055352-26-000002 · wk-form4_1772487725.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,989

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of PSUs previously granted to the reporting person on March 10, 2023. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 22, 2023 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $93.00 to $93.68. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0001055352-26-000002 · wk-form4_1772487725.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,715

F1 · shares: Represents shares of Class A Common Stock acquired by the reporting person upon the vesting of performance-based stock units (PSUs) granted to the reporting person on March 10, 2023, as a result of the level of achievement by Casella Waste Systems, Inc. of certain performance objectives during the period running from January 1, 2025 through December 31, 2025, and a multiplier based on relative total shareholder return for the period running from January 1, 2023 to December 31, 2025, as certified by the issuer's compensation and human capital committee on February 26, 2026.

SEC source: 0000911177-25-000086 · wk-form4_1746820807.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,416

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $119.44 to $120.41. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-25-000070 · wk-form4_1741983358.xml · nonDerivative · entry 4

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 29,509

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 22, 2023 and does not represent a discretionary sale by the reporting person.

SEC source: 0000911177-25-000070 · wk-form4_1741983358.xml · nonDerivative · entry 3

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 30,374

F3 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on May 12, 2022 and does not represent a discretionary sale by the reporting person.

SEC source: 0000911177-25-000070 · wk-form4_1741983358.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 31,126

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 22, 2023 and does not represent a discretionary sale by the reporting person.

SEC source: 0000911177-25-000070 · wk-form4_1741983358.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 32,202

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. Amended and Restated 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 12, 2026.

SEC source: 0000911177-25-000039 · wk-form4_1741037274.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 26,258

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of PSUs previously granted to the reporting person on March 11, 2022. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on May 12, 2022 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $113.38 to $114.27. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-25-000039 · wk-form4_1741037274.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 39,835

F1 · shares: Represents shares of Class A Common Stock acquired by the reporting person upon the vesting of performance-based stock units (PSUs) granted to the reporting person on March 11, 2022, as a result of the level of achievement by the issuer of certain performance objectives during the period running from January 1, 2024 through December 31, 2024, and a multiplier based on relative total shareholder return for the period running from January 1, 2022 to December 31, 2024, as certified by the issuer's compensation and human capital committee on February 27, 2025.

SEC source: 0000911177-24-000108 · wk-form4_1731965966.xml · nonDerivative · entry 4

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,729

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $107.00 to $107.25. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000108 · wk-form4_1731965966.xml · nonDerivative · entry 3

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,526

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $106.00 to $106.85. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000108 · wk-form4_1731965966.xml · derivative · entry 10

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 27,940 shares

Expires 2026-11-17

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.

F7 · derivative.exercise_date: The option vested on February 20, 2019.

SEC source: 0000911177-24-000108 · wk-form4_1731965966.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,418

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $108.50 to $108.837. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000108 · wk-form4_1731965966.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 38,669

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: 0000911177-24-000096 · wk-form4_1730927593.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 10,729

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $100.44 to $101.37. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000096 · wk-form4_1730927593.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,539

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $99.44 to $100.40. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000043 · wk-form4_1710447411.xml · nonDerivative · entry 3

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 34,238

F4 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 23, 2021 and does not represent a discretionary sale by the reporting person.

F5 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $93.79 to $94.17. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000043 · wk-form4_1710447411.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 35,189

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of RSUs previously granted to the reporting person. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on May 12, 2022 and August 22, 2023 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $94.09 to $94.33. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000043 · wk-form4_1710447411.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 36,862

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 12, 2025.

SEC source: 0000911177-24-000023 · wk-form4_1709242503.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 31,802

F2 · kind: Represents the sale of shares of Class A Common Stock pursuant to a "sell-to-cover" transaction in order to satisfy tax withholding obligations in connection with the vesting of PSUs previously granted to the reporting person on March 12, 2021. This sale was effected pursuant to an automatic sell-to-cover instruction adopted by the reporting person on August 23, 2021 and does not represent a discretionary sale by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $90.09 to $90.88. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-24-000023 · wk-form4_1709242503.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,102

F1 · shares: Represents shares of Class A Common Stock acquired by the reporting person upon the vesting of performance-based stock units (PSUs) granted to the reporting person on March 12, 2021, as a result of the level of achievement by the issuer of certain performance objectives during the period running from January 1, 2023 through December 31, 2023, and a multiplier based on relative total shareholder return for the period running from January 1, 2021 to December 31, 2023, as certified by the issuer's compensation and human capital committee on February 27, 2024.

SEC source: 0000911177-23-000105 · wk-form4_1691179574.xml · derivative · entry 9

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 724 shares

Expires 2023-12-12

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.

F5 · derivative.exercise_date: The option vested in three equal installments on December 13, 2014, 2015, 2016.

SEC source: 0000911177-23-000105 · wk-form4_1691179574.xml · nonDerivative · entry 3

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,299

SEC source: 0000911177-23-000105 · wk-form4_1691179574.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,023

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: 0000911177-23-000105 · wk-form4_1691179574.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,299

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $81.35 to $81.54. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-23-000045 · wf-form4_167899829511553.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,031

F1 · kind: Represents shares of Class A Common Stock automatically sold by the reporting person to satisfy tax withholding obligations in connection with the vesting of RSUs granted to the reporting person on March 12, 2020, March 12, 2021, and March 11, 2022. The automatic sale of the reporting person's shares of Class A Common Stock is provided for in a Restricted Stock Unit agreement constituting a "sell-to-cover transaction" intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Securities Exchange Act of 1934 and the sale does not represent a discretionary trade by the reporting person.

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $82.10 to $82.48. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-23-000030 · wf-form4_167883053552865.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 50,247

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal annual installments beginning on March 10, 2024.

SEC source: 0000911177-23-000022 · wf-form4_167727307213922.xml · nonDerivative · entry 3

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 43,949

F2 · kind: Represents shares of Class A Common Stock automatically sold by the reporting person to satisfy tax withholding obligations in connection with the vesting of PSUs granted to the reporting person on March 12, 2020. The automatic sale of the reporting person's shares of Class A Common Stock is provided for in a performance-based stock unit agreement constituting a "sell-to-cover transaction" intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Securities Exchange Act of 1934 and the sale does not represent a discretionary trade by the reporting person.

F4 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $75.89 to $76.86. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-23-000022 · wf-form4_167727307213922.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 54,477

F2 · kind: Represents shares of Class A Common Stock automatically sold by the reporting person to satisfy tax withholding obligations in connection with the vesting of PSUs granted to the reporting person on March 12, 2020. The automatic sale of the reporting person's shares of Class A Common Stock is provided for in a performance-based stock unit agreement constituting a "sell-to-cover transaction" intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Securities Exchange Act of 1934 and the sale does not represent a discretionary trade by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $74.89 to $75.88. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-23-000022 · wf-form4_167727307213922.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 77,915

F1 · shares: Represents shares of Class A Common Stock acquired by the reporting person upon the vesting of performance-based stock units (PSUs) granted to the reporting person on March 12, 2020, as a result of the level of achievement by Casella Waste Systems, Inc. of certain performance objectives during the period running from January 1, 2022 through December 31, 2022, and a multiplier based on relative total shareholder return for the period running from January 1, 2020 to December 31, 2022.

SEC source: 0000911177-23-000004 · wf-form5_167450862778501.xml · nonDerivative · entry 5

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Indirect · by SLAT 2

Disclosed balance after: 137,000

F2 · shares: Represents a gift of shares by Mr. Casella's spouse to a Spousal Lifetime Access Trust for the benefit of Mr. Casella ("SLAT 2"). Mr. Casella is the trustee of the SLAT 2.

F4 · ownership.nature: Held by the SLAT 2 for the benefit of Mr. Casella. Mr. Casella is the trustee of the SLAT 2.

SEC source: 0000911177-23-000004 · wf-form5_167450862778501.xml · nonDerivative · entry 4

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Indirect · By Spouse

Disclosed balance after: 57,100

F2 · shares: Represents a gift of shares by Mr. Casella's spouse to a Spousal Lifetime Access Trust for the benefit of Mr. Casella ("SLAT 2"). Mr. Casella is the trustee of the SLAT 2.

F3 · balance_after: Amount shown reflects an adjustment to correct an inadvertent administrative error that omitted 100 shares of the issuer's Class B Common Stock from columns 4 and 5 of Table I in the Form 4 filed by Mr. Casella on November 15, 2022 ("Previous Form 4"). Table I, column 4 of the Previous Form 4 correctly reported Mr. Casella's disposition of 194,100 shares of Class B Common Stock to his spouse as a gift, but the corresponding acquisition of such shares by Mr. Casella's spouse was inadvertently reported as 194,000 shares of Class B Common Stock in Table I, column 4 as well as in Table I, column 5 reporting indirect beneficial ownership. In both cases, the amount should have been reported as 194,100 shares of Class B Common Stock.

F1 · ownership.nature: Held by Mr. Casella's spouse. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities.

SEC source: 0000911177-22-000075 · wf-form4_166854761749128.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 11,601

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $81.92 to $82.86. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-22-000075 · wf-form4_166854761749128.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,728

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $80.79 to $81.77. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0000911177-22-000075 · wf-form4_166854761749128.xml · nonDerivative · entry 7

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Indirect · By SLAT

Disclosed balance after: 134,000

F5 · shares: Represents a gift of shares to a Spousal Lifetime Access Trust ("SLAT") for the benefit of Mr. Casella's spouse. Mr. Casella's spouse is the trustee of the SLAT.

F6 · ownership.nature: Held by the SLAT for the benefit of Mr. Casella's spouse. Mr. Casella's spouse is the trustee of the SLAT. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities.

SEC source: 0000911177-22-000075 · wf-form4_166854761749128.xml · nonDerivative · entry 6

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Indirect · By Spouse

Disclosed balance after: 194,000

F4 · shares: Represents a gift of shares to Mr. Casella's spouse.

F3 · ownership.nature: Held by Mr. Casella's spouse. Mr. Casella disclaims beneficial ownership of the securities indicated to the extent to which he does not have an actual pecuniary interest in such securities.

SEC source: 0000911177-22-000075 · wf-form4_166854761749128.xml · nonDerivative · entry 5

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 166,000

F5 · shares: Represents a gift of shares to a Spousal Lifetime Access Trust ("SLAT") for the benefit of Mr. Casella's spouse. Mr. Casella's spouse is the trustee of the SLAT.

SEC source: 0000911177-22-000075 · wf-form4_166854761749128.xml · nonDerivative · entry 4

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 300,000

F4 · shares: Represents a gift of shares to Mr. Casella's spouse.

SEC source: 0001415889-22-003064 · form4-03162022_020323.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 30,986

F1 · kind: Represents shares of Class A Common Stock automatically sold by the reporting person to satisfy tax withholding obligations in connection with the vesting of RSUs granted to the reporting person on March 12, 2019, March 12, 2020, and March 12, 2021. The automatic sale of the reporting person's shares of Class A Common Stock is provided for in a Restricted Stock Unit agreement constituting a "binding contract" consistent with the affirmative defense to liability under Rule 10b5-1 and the sale does not represent a discretionary trade by the reporting person.

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $87.83 to $88.20. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0001415889-22-003064 · form4-03162022_020323.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 31,289

F1 · kind: Represents shares of Class A Common Stock automatically sold by the reporting person to satisfy tax withholding obligations in connection with the vesting of RSUs granted to the reporting person on March 12, 2019, March 12, 2020, and March 12, 2021. The automatic sale of the reporting person's shares of Class A Common Stock is provided for in a Restricted Stock Unit agreement constituting a "binding contract" consistent with the affirmative defense to liability under Rule 10b5-1 and the sale does not represent a discretionary trade by the reporting person.

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $86.83 to $87.80. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0001415889-22-002982 · form4-03152022_030301.xml · nonDerivative · entry 2

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,860

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $90.00 to $90.66. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0001415889-22-002982 · form4-03152022_030301.xml · nonDerivative · entry 1

CASELLA JOHN W · CIK 0001055352 · Director · CHIEF EXECUTIVE OFFICER

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,904

F1 · kind: Represents the award of Restricted Stock Units (RSUs) under the Casella Waste Systems, Inc. 2016 Incentive Plan. Each RSU represents a contingent right to receive one share of Casella's Class A Common Stock. RSUs vest in three equal installments beginning on March 11, 2023.

SEC source: 0001179110-22-001644 · edgar.xml · nonDerivative · entry 3

CASELLA JOHN W · CIK 0001055352 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 38,946

F2 · kind: Represents shares of Class A Common Stock automatically sold by the reporting person to satisfy tax withholding obligations in connection with the vesting of PSUs granted to the reporting person on April 1, 2019. The automatic sale of the reporting person's shares of Class A Common Stock is provided for in a performance-based stock unit agreement constituting a "binding contract" consistent with the affirmative defense to liability under Rule 10b5-1 and the sale does not represent a discretionary trade by the reporting person.

F4 · price: Represents the weighted average sales price for shares sold in multiple transactions, at prices ranging from $71.00 to $71.39, inclusive. Upon request of the staff of the Securities and Exchange Commission, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.