SCHEDULE 13G/A 0001140361-21-004994 0001846343 XXXXXXXX LIVE 5 Subordinate Voting Shares, no par value 12/31/2025 0001780232 GFL Environmental Inc. 36168Q104 100 New Park Place Suite 500 Vaughan A6 L4K 0H9 Rule 13d-1(d) BCEC-GFL Borrower (Cayman) LP b E9 62062374 0 62062374 0 62062374 N 17.9 PN BCEC-GFL Borrower GP (Cayman), Ltd b E9 62062374 0 62062374 0 62062374 N 17.9 CO GFL Borrower II (Cayman) LP b E9 14584103 0 14584103 0 14584103 N 4.2 PN GFL Borrower II GP (Cayman), Ltd b E9 14584103 0 0 14584103 14584103 N 4.2 CO GFL Borrower Luxembourg S.a r.l. b N4 76646477 0 62062374 14584103 76646477 N 22.1 CO BCEC - GFL Holdings (Guernsey) L.P. b Y7 76646477 0 62062374 14584103 76646477 N 22.1 PN BCEC Management X Limited b Y7 76646477 0 62062374 14584103 76646477 N 22.1 CO GFL Environmental Inc. 100 New Park Place, Suite 500, Vaughan, Ontario, Canada, L4K 0H9 See Item 2(c) below See Item 2(c) below Each of the following is hereinafter individually referred to as a "Reporting Person" and collectively as the "Reporting Persons." This statement is filed on behalf of: (i) BCEC-GFL Borrower (Cayman) LP c/o BC Partners Advisors L.P. 650 Madison Avenue New York, New York 10022 Citizenship: Cayman Islands (ii) BCEC-GFL Borrower GP (Cayman), Ltd c/o BC Partners Advisors L.P. 650 Madison Avenue New York, New York 10022 Citizenship: Cayman Islands (iii) GFL Borrower II (Cayman) LP 168 Robinson Road, #37-01 Capital Tower, Singapore 068912 Citizenship: Cayman Islands (iv) GFL Borrower II GP (Cayman), Ltd c/o BC Partners Advisors L.P. 650 Madison Avenue New York, New York 10022 Citizenship: Cayman Islands (v) GFL Borrower Luxembourg S.a r.l. c/o BC Partners Advisors L.P. 650 Madison Avenue New York, New York 10022 Citizenship: Luxembourg (vi) BCEC-GFL Holdings (Guernsey) L.P. c/o BC Partners Advisors L.P. 650 Madison Avenue New York, New York 10022 Citizenship: Guernsey (vii) BCEC Management X Limited c/o BC Partners Advisors L.P. 650 Madison Avenue New York, New York 10022 Citizenship: Guernsey BCEC-GFL Borrower (Cayman) LP directly holds 62,062,374 subordinate voting shares, no par value (the "Subordinate Voting Shares") of GFL Environmental Inc. (the "Issuer") and GFL Borrower II (Cayman) LP directly holds 14,584,103 Subordinate Voting Shares of the Issuer. BCEC-GFL Borrower GP (Cayman), Ltd is the general partner of BCEC-GFL Borrower (Cayman) LP, and GFL Borrower II GP (Cayman), Ltd is the general partner of GFL Borrower II (Cayman) LP. Each of BCEC-GFL Borrower GP (Cayman), Ltd and GFL Borrower II GP (Cayman), Ltd is wholly-owned by GFL Borrower Luxembourg S.a r.l. GFL Borrower Luxembourg S.a r.l. is wholly-owned by BCEC - GFL Holdings (Guernsey) L.P. The general partner of BCEC - GFL Holdings (Guernsey) L.P. is BCEC Management X Limited. Y Calculations of the percentage of Subordinate Voting Shares of the Issuer beneficially owned are based on 347,010,981 Subordinate Voting Shares outstanding as of November 20, 2025, as reported in the Prospectus Supplement filed by the Issuer with the Securities and Exchange Commission on November 24, 2025. Each of the Reporting Persons may be deemed to be the beneficial owner of the Subordinate Voting Shares listed on such Reporting Person's cover page. As of December 31, 2025, BCEC-GFL Borrower (Cayman) LP directly holds 62,062,374 Subordinate Voting Shares of the Issuer and GFL Borrower II (Cayman) LP directly holds 14,584,103 Subordinate Voting Shares of the Issuer. By virtue of certain rights that Magny Cours Investment Pte Ltd., an affiliate of GIC Private Limited, has with respect to its investment in GFL Borrower II (Cayman) LP, GFL Borrower II (Cayman), LP and Magny Cours Investment Pte Ltd. may be deemed to share dispositive power over the securities held by GFL Borrower II (Cayman) LP. Neither the filing of this Schedule 13G nor any of its contents shall be deemed to constitute an admission that any Reporting Person is a member of a group with Magny Cours Investment Pte Ltd. and its affiliates for the purposes of Sections 13(d) and 13(g) of the Securities Exchange Act of 1934, as amended ("Exchange Act"). Each Reporting Person disclaims beneficial ownership of any Subordinate Voting Shares that may be deemed to be beneficially owned by Magny Cours Investment Pte Ltd. and its affiliates. By virtue of a certain Investor Rights Agreement, dated as of March 5, 2020 (the "Investor Rights Agreement"), entered into by and among Patrick Dovigi and certain of his affiliates (collectively with their affiliated transferees, the "Investor"), the Issuer and, solely for certain limited purposes, BC Partners Advisors, L.P., an affiliate of the Reporting Persons, the Investor and the Reporting Persons may be deemed to be part of a "group" for purposes of Section 13(d) of the Exchange Act. However, neither the filing of this Schedule 13G nor any of its contents shall be deemed to constitute an admission that such persons are members of any such group. Each of the Reporting Persons and the Investor and their respective affiliates separately make Schedule 13G filings reporting the Subordinate Voting Shares they may be deemed to beneficially own. Each Reporting Person disclaims beneficial ownership of any Subordinate Voting Shares that may be deemed to be beneficially owned by the Investor and its affiliates. Each of the Reporting Persons may be deemed to be the beneficial owner of the percentage of Subordinate Voting Shares listed on such Reporting Person's cover page. See each cover page hereof. See each cover page hereof. See each cover page hereof. See each cover page hereof. Y Y Y N See Item 4. Y Y BCEC-GFL Borrower (Cayman) LP /s/ Matthew Elston 02/13/2026 /s/ Mark Rodliffe 02/13/2026 BCEC-GFL Borrower GP (Cayman), Ltd /s/ Matthew Elston 02/13/2026 /s/ Mark Rodliffe 02/13/2026 GFL Borrower II (Cayman) LP /s/ Matthew Elston 02/13/2026 /s/ Mark Rodliffe 02/13/2026 GFL Borrower II GP (Cayman), Ltd /s/ Matthew Elston 02/13/2026 /s/ Mark Rodliffe 02/13/2026 GFL Borrower Luxembourg S.a r.l. /s/ Christelle Retif 02/13/2026 /s/ Pierre Stemper 02/13/2026 BCEC - GFL Holdings (Guernsey) L.P. /s/ Matthew Elston 02/13/2026 /s/ Mark Rodliffe 02/13/2026 BCEC Management X Limited /s/ Matthew Elston 02/13/2026 /s/ Mark Rodliffe 02/13/2026