8-K filed May 8, 2026, 7:59 PM ET ticker AAOI CIK 0001158114

other material confidence high sentiment neutral materiality 0.50

Applied Optoelectronics dismisses Grant Thornton, appoints PwC as FY2026 auditor

APPLIED OPTOELECTRONICS, INC.

Grant Thornton dismissed May 4, 2026 after competitive selection; PwC appointed for fiscal year ending Dec 31, 2026.
No adverse opinions or disagreements with Grant Thornton in FY2024/2025; prior material weakness in technical accounting controls remediated by Dec 2025.
Grant Thornton will complete review of Q1 2026; PwC not previously consulted on accounting matters.

item 4.01 item 9.01

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Source-grounded claims

27ecbe8c1d9bb40319cdf76905bccc967bc8aca6

APPLIED OPTOELECTRONICS, INC. dismissed Grant Thornton LLP as its auditor.

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

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

5df06a2a1cef66952df2768433ee50064e88fe1f

APPLIED OPTOELECTRONICS, INC. engaged PricewaterhouseCoopers LLP as its auditor.

Grant Thronton was previously engaged to perform a review of the Company’s consolidated financial statements for the quarter ending March 31, 2026.

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

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