CASELLA DOUGLAS R

SEC source: 0001055353-26-000008 · wk-form4_1786742163.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 90,141

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $91.04 to $91.26. 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: 0001055353-26-000008 · wk-form4_1786742163.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,484

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $91.00 to $91.23. 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: 0001055353-26-000008 · wk-form4_1786742163.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 104,803

SEC source: 0001055353-26-000006 · wk-form4_1780689834.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 106,641

F1 · shares: 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. The RSUs will vest in full on June 4, 2027.

SEC source: 0001055353-26-000002 · wk-form4_1774384147.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By SLAT 2

Disclosed balance after: 177,000

F1 · kind: Represents a gift of shares to the Spousal Lifetime Access Trust ("SLAT 2") for the benefit of Mr. Casella. Mr. Casella's spouse is the trustee of the SLAT 2.

F2 · ownership.nature: Held by the SLAT 2 for the benefit of Mr. Casella. Mr. Casella's spouse is the trustee of the SLAT 2. The trustee of SLAT 2 was incorrectly identified in prior filings as Mr. Casella.

SEC source: 0001055353-26-000002 · wk-form4_1774384147.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 129,000

F1 · kind: Represents a gift of shares to the Spousal Lifetime Access Trust ("SLAT 2") for the benefit of Mr. Casella. Mr. Casella's spouse is the trustee of the SLAT 2.

SEC source: 0001055353-26-000004 · wk-form4a_1780606161.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By SLAT

Disclosed balance after: 171,000

F1 · kind: Represents a gift of shares to the Spousal Lifetime Access Trust for the benefit of Mr. Casella's spouse ("SLAT"). Mr. Casella's spouse is the trustee of the SLAT. The original Form 4 filed on March 24, 2026 (the "Original Form 4") incorrectly reported the gift as a transfer of the shares to the Spousal Lifetime Access Trust for the benefit of Mr. Casella ("SLAT 2"). This amendment reflects the transfer of the shares to the SLAT and the correct amount of securities beneficially owned by the SLAT following the transaction reported in the Original Form 4.

F2 · ownership.nature: Held by the SLAT. 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: 0001055353-26-000002 · wk-form4_1774384147.xml · nonDerivative · entry 5

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By SLAT

Disclosed balance after: 164,000

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

F5 · ownership.nature: Held by the SLAT for the benefit of Mr. Casella's spouse. Mr. Casella is the trustee of the SLAT. The trustee of the SLAT was incorrectly identified in prior filings as 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: 0001055353-26-000002 · wk-form4_1774384147.xml · nonDerivative · entry 4

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 24,100

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

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: 0001055353-26-000004 · wk-form4a_1780606161.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By SLAT 2

Disclosed balance after: 170,000

F3 · kind: Represents a gift of shares to the SLAT 2. Mr. Casella is the trustee of the SLAT 2. The Original Form 4 incorrectly reported the gift as a transfer of the shares to the SLAT. This amendment reflects the transfer of the shares to the SLAT 2 and the correct amount of securities beneficially owned by the SLAT 2 following the transaction reported in the Original Form 4.

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

SEC source: 0001055353-25-000004 · wk-form4_1765314841.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 104,848

F1 · shares: Represents a gift of shares to the Goldman Sachs Philanthropy Fund.

SEC source: 0000911177-25-000058 · wk-form4_1741982984.xml · nonDerivative · entry 4

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 108,748

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 30, 2023 and does not represent a discretionary sale by the reporting person.

SEC source: 0000911177-25-000058 · wk-form4_1741982984.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 108,948

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 25, 2022 and does not represent a discretionary sale by the reporting person.

SEC source: 0000911177-25-000058 · wk-form4_1741982984.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 109,172

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 30, 2023 and does not represent a discretionary sale by the reporting person.

SEC source: 0000911177-25-000058 · wk-form4_1741982984.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 109,444

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: 0000911177-25-000052 · wk-form4_1741812056.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 107,875

F2 · balance_after: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $112.19 to $112.64. 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: 0000911177-25-000052 · wk-form4_1741812056.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,033

F1 · balance_after: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $111.00 to $111.81. 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: 0000911177-24-000118 · wk-form4_1733346206.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 113,262

F1 · shares: Represents a gift of shares to the Goldman Sachs Philanthropy Fund.

SEC source: 0000911177-24-000116 · wk-form4_1732570623.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 115,435

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $112.16 to $112.47. 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: 0000911177-24-000045 · wk-form4_1710447513.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 135,435

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 $94.05 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: 0000911177-24-000045 · wk-form4_1710447513.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 135,826

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 25, 2022 and August 30, 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 $94.06 to $94.11. 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: 0000911177-24-000045 · wk-form4_1710447513.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 136,500

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: 0000911177-23-000152 · wk-form4_1700687376.xml · nonDerivative · entry 4

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By SLAT 2

Disclosed balance after: 137,000

F1 · shares: 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.

F3 · ownership.nature: Held by the SLAT 2 for the benefit of Mr. Casella. Mr. Casella is the trustee of the SLAT 2.

SEC source: 0000911177-23-000152 · wk-form4_1700687376.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 57,100

F1 · shares: 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.

F2 · 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: 0000911177-23-000136 · wk-form4_1696369485.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By SLAT

Disclosed balance after: 131,000

F1 · 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.

F2 · ownership.nature: Held by the SLAT for the benefit of Mr. Casella's spouse SLAT. 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: 0000911177-23-000136 · wk-form4_1696369485.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 169,000

F1 · 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: 0000911177-23-000120 · wk-form4_1692303796.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Indirect · By Spouse

Disclosed balance after: 194,100

F1 · shares: Represents a gift of shares to Mr. Casella's spouse.

F2 · 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: 0000911177-23-000120 · wk-form4_1692303796.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 300,000

F1 · shares: Represents a gift of shares to Mr. Casella's spouse.

SEC source: 0000911177-23-000113 · wk-form4_1691698457.xml · nonDerivative · entry 4

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 134,742

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $80.00 to $80.53. 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: 0000911177-23-000113 · wk-form4_1691698457.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 153,528

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $80.05 to $80.17. 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: 0000911177-23-000113 · wk-form4_1691698457.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 156,651

SEC source: 0000911177-23-000113 · wk-form4_1691698457.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 157,865

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $80.00 to $80.05. 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: 0000911177-23-000049 · wf-form4_167899837526129.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 160,045

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: 0000911177-23-000036 · wf-form4_167883067062913.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 160,961

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: 0000911177-22-000071 · wf-form4_166793614599415.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 158,773

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $81.63 to $81.78. 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: 0000911177-22-000071 · wf-form4_166793614599415.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 159,078

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $80.61 to $81.58. 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: 0000911177-22-000071 · wf-form4_166793614599415.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 181,826

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $80.46 to $81.39. 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: 0001415889-22-008972 · form4-08232022_050803.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 208,773

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $83.57 to $84.41. 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: 0001415889-22-003067 · form4-03162022_030320.xml · nonDerivative · entry 4

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 228,773

F5 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $88.02 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: 0001415889-22-003067 · form4-03162022_030320.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 230,173

F4 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $88.00 to $88.36. 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: 0001415889-22-003067 · form4-03162022_030320.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 245,490

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: 0001415889-22-003067 · form4-03162022_030320.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 245,621

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: 0001415889-22-002984 · form4-03152022_030312.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 246,735

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $90.01 to $90.52. 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: 0001415889-22-002984 · form4-03152022_030312.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 247,835

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $89.00 to $89.99. 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: 0001415889-22-002984 · form4-03152022_030312.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · VICE CHAIRMAN, BD OF DIRECTORS

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 260,166

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: 0001179110-21-008127 · edgar.xml · nonDerivative · entry 5

CASELLA DOUGLAS R · CIK 0001055353 · Director · Vice Chairman, Bd of Directors

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 258,353

F5 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $69.00 to $69.71. 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: 0001179110-21-008127 · edgar.xml · nonDerivative · entry 4

CASELLA DOUGLAS R · CIK 0001055353 · Director · Vice Chairman, Bd of Directors

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 277,912

F4 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $68.00 to $68.99. 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: 0001179110-21-008127 · edgar.xml · nonDerivative · entry 3

CASELLA DOUGLAS R · CIK 0001055353 · Director · Vice Chairman, Bd of Directors

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 285,612

F3 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $68.02 to $68.68. 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: 0001179110-21-008127 · edgar.xml · nonDerivative · entry 2

CASELLA DOUGLAS R · CIK 0001055353 · Director · Vice Chairman, Bd of Directors

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 294,010

F2 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $68.00 to $68.59. 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: 0001179110-21-008127 · edgar.xml · nonDerivative · entry 1

CASELLA DOUGLAS R · CIK 0001055353 · Director · Vice Chairman, Bd of Directors

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 356,353

F1 · price: Represents the weighted average sales price for shares sold in multiple transactions, ranging from $68.50 to $68.54. 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.