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The 10-K filing for BBCMS Mortgage Trust 2021-C9, dated March 23, 2026, covers the fiscal year ended December 31, 2025. As a commercial mortgage-backed securities (CMBS) trust, no traditional financial statements or XBRL data are provided; Item 8 is omitted. The report emphasizes compliance with Regulation AB servicing criteria under Items 1122 and 1123. Management and servicers, including Midland Loan Services (master servicer), K-Star Asset Management (special servicer), KeyBank National Association (primary servicer for key loans), and others like Wells Fargo and Computershare, assert material compliance for their roles. Key loans highlighted: The Atlantic Mortgage Loan (9.4% of pool), MGM Grand & Mandalay Bay (7.3%), Crescent Gateway (4.0%), Seaport Homes (1.8%), McCarthy Ranch (0.6%). No delinquencies, losses, or material legal proceedings noted (Item 1117). Servicing transfers and vendor roles detailed, with attestations from auditors like PwC and KPMG confirming compliance. No significant changes in performance metrics; focus remains on operational adherence amid pari passu loan structures across related deals. Investor relevance: Confirms ongoing servicing integrity for pool assets totaling undisclosed principal, with no single obligor exceeding 10%.