X0202 SCHEDULE 13D/A 0000929638-26-002599 0000014661 XXXXXXXX LIVE 8 Class S Units of Beneficial Interest 09/02/2026 true 0002097545 03116N104 AMG BBH Asset-Backed Credit Fund, LLC

680 Washington Boulevard, Suite 500 Stamford CT 06901

Morgan, Lewis & Bockius LLP 617-951-8000 One Federal Street Boston MA 02110 0000014661 BROWN BROTHERS HARRIMAN & CO AF OO NY 2278852.74 390440.52 2278852.74 390440.52 2669293.26 N 63.39 IA 0002102651 BROWN BROTHERS HARRIMAN CREDIT PARTNERS, LLC WC DE 0 390440.52 0 390440.52 390440.52 N 9.27 BK HC Class S Units of Beneficial Interest AMG BBH Asset-Backed Credit Fund, LLC 680 Washington Boulevard, Suite 500 Stamford CT 06901 Since the filing of the original Schedule 13D, Credit Partners and the Client Accounts have acquired additional Class S Units of Beneficial Interest from the Issuer using working capital and funds of such Client Accounts, respectively. Information regarding such transactions is set forth in Item 5(c), as has been amended from time to time, which is incorporated herein by reference. Capitalized terms used and not otherwise defined in this Schedule 13D amendment have the meanings ascribed to them in the original Schedule 13D. See Items 7-13 of the cover pages and Item 2 above. See Items 7-13 of the cover pages and Item 2 above. The Reporting Persons have not engaged in transactions in securities of the Issuer during the sixty day period prior to the filing of this Schedule 13D amendment that have not previously been reported, other than the transactions listed in Exhibit 99.2. The information set forth in Item 4 hereof is hereby incorporated by reference into this Item 6. Exhibit 99.1 Joint Filing Agreement between the Reporting Persons, dated July 14, 2026, incorporated by reference to Exhibit 99.1 to the Schedule 13D filed by the Reporting Persons on July 14, 2026. Exhibit 99.2 Recent transactions. BROWN BROTHERS HARRIMAN & CO /s/ Paul Gallagher 09/04/2026 BROWN BROTHERS HARRIMAN CREDIT PARTNERS, LLC /s/ Paul Gallagher 09/04/2026