of this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Executive Vice President and Chief Operating Officer — Damian A. Ribar: The company hired a new Executive Vice President and Chief Operating Officer with a detailed employment agreement.

Executive Vice President and Chief Operating Officer — Damian A. Ribar: The company appointed a new Executive Vice President and Chief Operating Officer from an external hire.

Other Events. On May 11, 2026, Casella Waste Systems, Inc. (the “Company”) announced that it has commenced the remarketing of $15.0 million aggregate principal amount of New York State Environmental Facilities Corporation (the “Issuer”) Solid Waste Disposal Revenue Bonds (Casella Waste Systems, Inc. Project) Series 2014R-2 (collectively, the “Bonds”). The Bonds were issued pursuant to an Indenture dated as of December 1, 2014 (the “Indenture”) and drawn down on June 2, 2016. The Bonds have a…

of this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Entry into a Material Definitive Agreement. On April 20, 2026, Casella Waste Systems, Inc. (“Casella”), and certain of its subsidiaries (each a “Subsidiary,” and collectively, the “Subsidiaries,” and together with Casella, the “Co-Lessees”), entered into a Master Lease Agreement No. 68105 and an Addendum to Master Lease Agreement No. 68105 (Co-Lessee) (collectively, the “Master Lease”) with Huntington National Bank (“HNB”) for the purpose of leasing or financing motor vehicles and other equip…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The discussion of the Master Lease set forth under

Senior Vice President and Chief Operating Officer of Solid Waste Operations — Sean Steves: Mr. Steves resigned to pursue other opportunities outside of the waste and recycling industry.

of this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as expressly set forth by specific reference in such a filing.

of this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Other Events. On August 18, 2025, Casella Waste Systems, Inc. (the “Company”) announced that it has commenced the remarketing of $37.5 million aggregate principal amount of New York State Environmental Facilities Corporation (the “Issuer”) Solid Waste Disposal Revenue Bonds (Casella Waste Systems, Inc. Project) Series 2020R-1 issued on September 1, 2020 in the stated principal amount of $40.0 million (collectively, the “Bonds”). It is expected that $2.5 million of the aggregate principal amou…

CEO — John W. Casella: The CEO is transitioning to Executive Chairman with a named internal successor (President) taking over the role, representing an orderly succession rather than a sudden loss of leadership.

of this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Other Events. On July 17, 2025, Casella Waste Systems, Inc. (the “ Company ”) announced that it has commenced the remarketing of $29.0 million aggregate principal amount of Finance Authority of Maine (the “ Issuer ”) Solid Waste Disposal Revenue Bonds (Casella Waste Systems, Inc. Project) Series 2015R-1 issued on August 27, 2015 and Series 2015R-2 issued on April 2, 2018 (collectively, the “ Bonds ”). The Bonds were originally issued in the aggregate principal amount of $30.0 million. It is e…

of this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Creation of a Direct Financial Obligation or an obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth under

Entry into a Material Definitive Agreement. On March 11, 2025, Casella Waste Systems, Inc. (the “ Company ”) completed a financing transaction pursuant to which the Company incurred indebtedness in the principal amount of $25.0 million. The transaction involved the issuance by Vermont Economic Development Authority (the “ Issuer ”) of $25.0 million aggregate principal amount of its Solid Waste Disposal Revenue Bonds (Casella Waste Systems, Inc. Project) Series 2022A-2 (the “ 2022A-2 Bonds ”).…

of this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as expressly set forth by specific reference in such a filing.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information set forth under

Entry into a Material Definitive Agreement. On December 23, 2024, Casella Waste Systems, Inc. (the “Company”) completed a financing transaction pursuant to which the Company incurred indebtedness in the principal amount of $45.0 million. The transaction involved the issuance by the Finance Authority of Maine (the “Authority”) of $45.0 million aggregate principal amount of its Solid Waste Disposal Revenue Bonds (Casella Waste Systems, Inc. Project) Series 2024 (the “Bonds”). The Bonds were iss…

of this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, except as expressly set forth by specific reference in such a filing.

in this Form 8-K (including Exhibit 99.1) shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, or the Exchange Act, except as expressly set forth by specific reference in such a filing. Safe Harbor Statement Certain matters discussed in this Current Report…

Entry into a Material Definitive Agreement. On September 27, 2024, Casella Waste Systems, Inc. (the “Company”) entered into a Second Amended and Restated Credit Agreement by and among Bank of America, N.A., as administrative agent (“Administrative Agent”), Bank of America, N.A., as lender, and the other lenders party thereto (collectively, the “Lenders”), the Company, the Company’s subsidiaries identified therein and the other parties thereto (the “Credit Facility”), which amends and restates…

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The discussion of the Credit Facility set forth under

Entry into a Material Definitive Agreement. On September 17, 2024, Casella Waste Systems, Inc. (the “Company”) entered into an underwriting agreement (the “Underwriting Agreement”) with Raymond James & Associates, Inc., J.P. Morgan Securities LLC and Stifel, Nicolaus & Company, Incorporated acting as the representatives of the several underwriters named therein (collectively, the “Underwriters”), relating to an underwritten public offering of 4,500,000 shares (the “Underwritten Shares”) of th…