# Sionna Therapeutics, Inc.: filings

SION · Nasdaq · CIK 2036042 · [Healthcare](/sectors/healthcare.md) · fiscal year ends Dec 31

Pages: [Overview](/companies/sion.md) · [Financials](/companies/sion/financials.md) · [Filings](/companies/sion/filings.md) · [Insiders](/companies/sion/insiders.md)

## Reports and events: 33 filings

Newest first, by EDGAR acceptance time (Eastern). Filter with ?form= one of: `periodic`, `8-K`, `10-K`, `10-Q`, `4`, `proxy`, `13dg`, `all`, or any form this company filed (4 82, 144 68, 3 18, 8-K 13, 10-Q 5, SCHEDULE 13D 5, CORRESP 4, SCHEDULE 13D/A 4, 10-K 2, ARS 2, DEF 14A 2, DEFA14A 2, S-8 2, SCHEDULE 13G 2, SCHEDULE 13G/A 2, SEC STAFF LETTER 2, UPLOAD 2, 144/A 1, 424B4 1, 8-A12B 1, CERT 1, DRS 1, DRS/A 1, DRSLTR 1, EFFECT 1, S-1 1, S-1/A 1, S-1MEF 1, S-3ASR 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-09-21 | 18:57 ET | [SCHEDULE 13D/A](/filings/0001346824-26-000239.md) | Ownership report, active investor, amended | 0001346824-26-000239 |
| 2026-09-14 | 16:10 ET | [8-K](/filings/0001193125-26-390577.md) | 2.05 Exit or disposal costs; 5.02 Departure or appointment of officers or directors; 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-26-390577 |
| 2026-08-10 | 07:15 ET | [8-K](/filings/0001193125-26-341230.md) | 8.01 Other events; 9.01 Financial statements and exhibits | 0001193125-26-341230 |
| 2026-08-06 | 07:19 ET | [10-Q](/filings/0001628280-26-053839.md) | Quarterly report, period 2026-06-30 | 0001628280-26-053839 |
| 2026-08-06 | 07:12 ET | [8-K](/filings/0001628280-26-053832.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001628280-26-053832 |
| 2026-06-18 | 16:05 ET | [8-K](/filings/0001628280-26-044263.md) | 5.07 Shareholder vote results | 0001628280-26-044263 |
| 2026-05-12 | 07:17 ET | [10-Q](/filings/0001628280-26-033876.md) | Quarterly report, period 2026-03-31 | 0001628280-26-033876 |
| 2026-05-12 | 07:08 ET | [8-K](/filings/0001628280-26-033870.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001628280-26-033870 |
| 2026-04-27 | 16:04 ET | [DEF 14A](/filings/0001628280-26-027489.md) | Proxy statement, period 2026-06-17 | 0001628280-26-027489 |
| 2026-04-20 | 18:46 ET | [SCHEDULE 13D/A](/filings/0000947871-26-000456.md) | Ownership report, active investor, amended | 0000947871-26-000456 |
| 2026-03-02 | 07:19 ET | [10-K](/filings/0001628280-26-012996.md) | Annual report, period 2025-12-31 | 0001628280-26-012996 |
| 2026-03-02 | 07:09 ET | [8-K](/filings/0001628280-26-012993.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001628280-26-012993 |
| 2025-11-07 | 16:59 ET | [SCHEDULE 13D/A](/filings/0001346824-25-000045.md) | Ownership report, active investor, amended | 0001346824-25-000045 |
| 2025-11-05 | 07:28 ET | [10-Q](/filings/0001628280-25-049251.md) | Quarterly report, period 2025-09-30 | 0001628280-25-049251 |
| 2025-11-05 | 07:14 ET | [8-K](/filings/0001628280-25-049246.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001628280-25-049246 |
| 2025-10-20 | 21:40 ET | [SCHEDULE 13D/A](/filings/0001708269-25-000004.md) | Ownership report, active investor, amended | 0001708269-25-000004 |
| 2025-08-11 | 07:21 ET | [10-Q](/filings/0002036042-25-000047.md) | Quarterly report, period 2025-06-30 | 0002036042-25-000047 |
| 2025-08-11 | 07:13 ET | [8-K](/filings/0002036042-25-000044.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0002036042-25-000044 |
| 2025-06-13 | 16:09 ET | [8-K](/filings/0002036042-25-000018.md) | 5.07 Shareholder vote results | 0002036042-25-000018 |
| 2025-06-04 | 07:13 ET | [8-K](/filings/0001193125-25-134462.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-134462 |
| 2025-05-12 | 07:31 ET | [10-Q](/filings/0002036042-25-000016.md) | Quarterly report, period 2025-03-31 | 0002036042-25-000016 |
| 2025-05-12 | 07:12 ET | [8-K](/filings/0002036042-25-000014.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0002036042-25-000014 |
| 2025-04-29 | 07:28 ET | [DEF 14A](/filings/0001193125-25-101830.md) | Proxy statement, period 2025-06-12 | 0001193125-25-101830 |
| 2025-03-20 | 07:27 ET | [10-K](/filings/0002036042-25-000005.md) | Annual report, period 2024-12-31 | 0002036042-25-000005 |
| 2025-03-20 | 07:15 ET | [8-K](/filings/0001193125-25-058306.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001193125-25-058306 |
| 2025-02-18 | 20:56 ET | [SCHEDULE 13D](/filings/0001839882-25-009559.md) | Ownership report, active investor | 0001839882-25-009559 |
| 2025-02-18 | 16:59 ET | [SCHEDULE 13D](/filings/0001415889-25-004453.md) | Ownership report, active investor | 0001415889-25-004453 |
| 2025-02-18 | 16:25 ET | [SCHEDULE 13D](/filings/0001415889-25-004419.md) | Ownership report, active investor | 0001415889-25-004419 |
| 2025-02-18 | 16:22 ET | [SCHEDULE 13D](/filings/0001415889-25-004410.md) | Ownership report, active investor | 0001415889-25-004410 |
| 2025-02-13 | 16:47 ET | [SCHEDULE 13D](/filings/0000947871-25-000138.md) | Ownership report, active investor | 0000947871-25-000138 |
| 2025-02-10 | 16:01 ET | [8-K](/filings/0001193125-25-023570.md) | 5.03 Amendment to articles or bylaws; 9.01 Financial statements and exhibits | 0001193125-25-023570 |
| 2025-02-03 | 06:06 ET | [S-1/A](/filings/0001193125-25-018825.md) | Registration statement, amended | 0001193125-25-018825 |
| 2025-01-17 | 17:00 ET | [S-1](/filings/0001193125-25-008474.md) | Registration statement | 0001193125-25-008474 |

Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 24, 2026, 15:06 ET. No prices; not investment advice.