8-K filed October 14, 2025, 7:59 PM ET ticker OPTX CIK 0001866816

other material confidence high sentiment neutral materiality 0.60

Syntec Optics auditor Marcum resigns; CBIZ CPAs appointed Oct 10, 2025

SYNTEC OPTICS HOLDINGS, INC.

Marcum LLP resigned as independent auditor on Oct 10, 2025; CBIZ CPAs P.C. engaged as replacement.
No disagreements with Marcum on accounting principles or audit scope during past two fiscal years.
Marcum's reports for FYE 2023 and 2024 were unqualified; no adverse opinion or modification.
Material weaknesses in internal controls were previously disclosed in 2024 10-K (Item 9A).
Company provided Marcum with disclosure copy; Marcum concurred via letter dated Oct 10, 2025 (Ex. 16.1).

item 4.01 item 9.01

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accession: 0001493152-25-017828
form_type: 8-K
ticker: OPTX
cik: 0001866816
company_name: SYNTEC OPTICS HOLDINGS, INC.
filed_at: 2025-10-14T23:59:59+00:00
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Source-grounded claims

20b2673d8edefb7aed7e3c8f539ca5b5f1cffb3f

Marcum LLP resigned as auditor of SYNTEC OPTICS HOLDINGS, INC..

On October 10, 2025, Marcum informed Syntec Optics Holdings, Inc. (the “Company”) and as the Audit Committee of the Board of Directors approved, that Marcum resigned as the Company’s independent registered public accounting firm.

SEC 8-K Item 4.01/4.02 confidence 0.9 SEC evidence

8a7ac7cca1928793a5e0d3ca8974deedf2ef3b3d

SYNTEC OPTICS HOLDINGS, INC. engaged CBIZ CPAs P.C. as its auditor.

On October 10, 2025, the Company, with the approval of the Audit Committee of the Board of Directors and the Board of Directors, engaged CBIZ CPAs P.C. as the Company’s independent registered public accounting firm.

SEC 8-K Item 4.01/4.02 confidence 0.9 SEC evidence

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On October 10, 2025, Marcum informed Syntec Optics Holdings, Inc. (the “Company”) and as the Audit Committee of the Board of Directors approved, that Marcum resigned as the Company’s independent registered public accounting firm.

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On October 10, 2025, Marcum informed Syntec Optics Holdings, Inc. (the “Company”) and as the Audit Committee of the Board of Directors approved, that Marcum resigned as the Company’s independent registered public accounting firm.

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On October 10, 2025, Marcum informed Syntec Optics Holdings, Inc. (the “Company”) and as the Audit Committee of the Board of Directors approved, that Marcum resigned as the Company’s independent registered public accounting firm.

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On October 10, 2025, Marcum informed Syntec Optics Holdings, Inc. (the “Company”) and as the Audit Committee of the Board of Directors approved, that Marcum resigned as the Company’s independent registered public accounting firm.

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On October 10, 2025, Marcum informed Syntec Optics Holdings, Inc. (the “Company”) and as the Audit Committee of the Board of Directors approved, that Marcum resigned as the Company’s independent registered public accounting firm.

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On October 10, 2025, Marcum informed Syntec Optics Holdings, Inc. (the “Company”) and as the Audit Committee of the Board of Directors approved, that Marcum resigned as the Company’s independent registered public accounting firm.

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on May 4, 2026, the Committee approved the dismissal of Grant Thornton as the Company’s independent registered public accounting firm.

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