Plum Acquisition Corp. III auditor Marcum resigns; CBIZ CPAs acquired attest business

Plum Acquisition Corp. III

Marcum LLP resigned as independent registered public accounting firm on June 3, 2026.
CBIZ CPAs P.C. acquired Marcum's attest business effective November 1, 2024.
No disagreements or reportable events except material weakness in internal control over financial reporting disclosed in 2025 10-K and Q1 2026 10-Q.
Marcum's reports for fiscal years 2024 and 2025 were unqualified.
Marcum letter dated August 14, 2026 filed as Exhibit 16.1.

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