INNOVATIVE SOLUTIONS AND SUPPORT, INC. Auditor
The independent registered public accounting firm that signed the audit report in each annual report on Form 10-K, newest first. PCAOB firm ID and the internal-control attestation are as tagged on the cover from fiscal 2021; earlier rows come from the signed report text.
- 2026-01-27: Fiscal year end 2025-09-30; Auditor GRANT THORNTON LLP; PCAOB firm ID 248; Location Philadelphia, Pennsylvania.
- 2025-12-23: Fiscal year end 2025-09-30; Auditor GRANT THORNTON LLP; PCAOB firm ID 248; Location Philadelphia, Pennsylvania.
- 2025-01-23: Fiscal year end 2024-09-30; Auditor GRANT THORNTON LLP; PCAOB firm ID 248; Location Philadelphia, Pennsylvania.
- 2024-12-30: Fiscal year end 2024-09-30; Auditor GRANT THORNTON LLP; PCAOB firm ID 248; Location Philadelphia, Pennsylvania.
| Filed | Fiscal year end | Auditor | PCAOB firm ID | Location | Internal-control attestation |
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| 2026-01-27 | 2025-09-30 | GRANT THORNTON LLP | 248 | Philadelphia, Pennsylvania | No |
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| 2025-12-23 | 2025-09-30 | GRANT THORNTON LLP | 248 | Philadelphia, Pennsylvania | No |
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| 2025-01-23 | 2024-09-30 | GRANT THORNTON LLP | 248 | Philadelphia, Pennsylvania | No |
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| 2024-12-30 | 2024-09-30 | GRANT THORNTON LLP | 248 | Philadelphia, Pennsylvania | No |
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| 2024-01-29 | 2023-09-30 | GRANT THORNTON LLP | 248 | Philadelphia, Pennsylvania | No |
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| 2024-01-12 | 2023-09-30 | GRANT THORNTON LLP | 248 | Philadelphia, Pennsylvania | No |
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| 2023-01-31 | 2022-09-30 | GRANT THORNTON LLP | 248 | Philadelphia, Pennsylvania | No |
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| 2022-12-16 | 2022-09-30 | GRANT THORNTON LLP | 248 | Philadelphia, Pennsylvania | No |
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| 2021-12-22 | 2021-09-30 | GRANT THORNTON LLP | | Philadelphia, Pennsylvania | |
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| 2020-12-22 | 2020-09-30 | GRANT THORNTON LLP | | Philadelphia, Pennsylvania | |
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| 2019-12-23 | 2019-09-30 | GRANT THORNTON LLP | | Philadelphia, Pennsylvania | |
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| 2018-12-21 | 2018-09-30 | GRANT THORNTON LLP | | Philadelphia, Pennsylvania | |
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| 2017-12-15 | 2017-09-30 | GRANT THORNTON LLP | | Philadelphia, Pennsylvania | |
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| 2016-12-16 | 2016-09-30 | GRANT THORNTON LLP | | Philadelphia, Pennsylvania | |
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| 2016-01-14 | 2015-09-30 | GRANT THORNTON LLP | | Philadelphia, Pennsylvania | |
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| 2014-12-15 | 2014-09-30 | GRANT THORNTON LLP | | Philadelphia, Pennsylvania | |
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| 2013-12-20 | 2013-09-30 | DELOITTE & TOUCHE LLP | | Philadelphia, Pennsylvania | |
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| 2012-12-14 | 2012-09-30 | DELOITTE & TOUCHE LLP | | Philadelphia, Pennsylvania | |
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| 2011-12-14 | 2011-09-30 | DELOITTE & TOUCHE LLP | | Philadelphia, Pennsylvania | |
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| 2009-12-14 | 2009-09-30 | DELOITTE & TOUCHE LLP | | Philadelphia, Pennsylvania | |
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