secwatch / observer
8-K filed March 5, 2026, 6:59 PM ET CIK 0001918102
regulatory confidence high sentiment neutral materiality 0.50

Deep Fission replaces auditor dbbmckennon with Grant Thornton; material weakness in internal controls disclosed

DEEP FISSION, INC.

Machine-readable event card

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0001918102
company_name
DEEP FISSION, INC.
filed_at
2026-03-05T23:59:59+00:00
discovered_at
2026-05-14T18:02:36.753595+00:00
generated_at
2026-05-15T19:58:11.202300+00:00
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https://www.sec.gov/Archives/edgar/data/1918102/000110465926023876/tm267549d1_8k.htm
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Source-grounded claims

19fb1f1cd3d0ddbf2b86e8f43f53f8383c5cd10a

DEEP FISSION, INC. engaged Grant Thornton LLP as its auditor.

On February 27, 2026, the Audit Committee of the Board of Directors (the “Audit Committee”) of Deep Fission, Inc. (the “Company”) approved the engagement of Grant Thornton LLP (“Grant Thornton”) as the Company’s independent registered public accounting firm to audit the Company’s consolidated financial statements for the fiscal years ended December 31, 2024 and 2025.

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

ecfb431323a42c64d91cf329830fefee1bc5d6a5

DEEP FISSION, INC. dismissed dbbmckennon as its auditor.

Accordingly, dbbmckennon (“dbbmckennon”), the Company’s independent registered public accounting firm since September 5, 2025, was informed that it would be replaced as the Company’s independent registered public accounting firm effective February 27, 2026.

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

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This filing

On February 27, 2026, the Audit Committee of the Board of Directors (the “Audit Committee”) of Deep Fission, Inc. (the “Company”) approved the engagement of Grant Thornton LLP (“Grant Thornton”) as the Company’s independent registered public accounting firm to audit the Company’s consolidated financial statements for the fiscal years ended December 31, 2024 and 2025.

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On February 27, 2026, the Audit Committee of the Board of Directors (the “Audit Committee”) of Deep Fission, Inc. (the “Company”) approved the engagement of Grant Thornton LLP (“Grant Thornton”) as the Company’s independent registered public accounting firm to audit the Company’s consolidated financial statements for the fiscal years ended December 31, 2024 and 2025.

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On February 27, 2026, the Audit Committee of the Board of Directors (the “Audit Committee”) of Deep Fission, Inc. (the “Company”) approved the engagement of Grant Thornton LLP (“Grant Thornton”) as the Company’s independent registered public accounting firm to audit the Company’s consolidated financial statements for the fiscal years ended December 31, 2024 and 2025.

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On February 27, 2026, the Audit Committee of the Board of Directors (the “Audit Committee”) of Deep Fission, Inc. (the “Company”) approved the engagement of Grant Thornton LLP (“Grant Thornton”) as the Company’s independent registered public accounting firm to audit the Company’s consolidated financial statements for the fiscal years ended December 31, 2024 and 2025.

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On February 27, 2026, the Audit Committee of the Board of Directors (the “Audit Committee”) of Deep Fission, Inc. (the “Company”) approved the engagement of Grant Thornton LLP (“Grant Thornton”) as the Company’s independent registered public accounting firm to audit the Company’s consolidated financial statements for the fiscal years ended December 31, 2024 and 2025.

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This filing

On February 27, 2026, the Audit Committee of the Board of Directors (the “Audit Committee”) of Deep Fission, Inc. (the “Company”) approved the engagement of Grant Thornton LLP (“Grant Thornton”) as the Company’s independent registered public accounting firm to audit the Company’s consolidated financial statements for the fiscal years ended December 31, 2024 and 2025.

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On February 27, 2026, the Audit Committee of the Board of Directors (the “Audit Committee”) of Deep Fission, Inc. (the “Company”) approved the engagement of Grant Thornton LLP (“Grant Thornton”) as the Company’s independent registered public accounting firm to audit the Company’s consolidated financial statements for the fiscal years ended December 31, 2024 and 2025.

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Source: SEC EDGAR
accession 0001104659-26-023876

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