Sionna Therapeutics, Inc.
SION
21 insider filings · Latest: Jun 17, 2026
Common Stock Transactions
| Txn Date | Accepted | Insider | Type | Shares | Avg Price | Value | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|---|
| Sep 30, 2025 | Sep 30 8:21 PM | Atlas Venture Fund XI, LP | Proposed Sale | 10,239 | $29.52 | $302.3K | — | View → |
| Sep 30, 2025 | Sep 30 8:21 PM | Atlas Venture Opportunity Fund II, L.P. | Proposed Sale | 2,149 | $29.52 | $63.4K | — | View → |
| Sep 29, 2025 | Sep 29 8:39 PM | Atlas Venture Fund XI, LP | Proposed Sale | 54,637 | $28.94 | $1.6M | — | View → |
| Sep 29, 2025 | Sep 29 8:39 PM | Atlas Venture Opportunity Fund II, L.P. | Proposed Sale | 11,468 | $28.94 | $331.9K | — | View → |
| Sep 26, 2025 | Sep 26 8:31 PM | MICHAEL CLOONAN | Proposed Sale | 25,000 | $27.50 | $687.5K | — | View → |
| Sep 4, 2025 | Sep 4 8:24 PM | JENNIFER R FITZPATRICK | Proposed Sale | 10,250 | $24.55 | $251.6K | — | View → |
| Aug 26, 2025 | Aug 26 8:28 PM | MICHAEL CLOONAN | Proposed Sale | 25,000 | $24.06 | $601.5K | — | View → |
| Aug 26, 2025 | Aug 26 8:28 PM | ELENA RIDLOFF | Proposed Sale | 33,000 | $24.06 | $794.0K | — | View → |
| Aug 20, 2025 | Aug 20 8:26 PM | ELENA RIDLOFF | Proposed Sale | 17,500 | $21.48 | $375.9K | — | View → |
| Aug 20, 2025 | Aug 20 8:22 PM | MICHAEL CLOONAN | Proposed Sale | 25,000 | $21.48 | $537.0K | — | View → |
| Aug 19, 2025 | Aug 19 8:26 PM | ELENA RIDLOFF | Proposed Sale | 34,500 | $21.39 | $738.0K | — | View → |
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Stock Options & Derivatives
| Txn Date | Accepted | Insider | Type | Shares | Exercise Price | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|
| Jun 17, 2026 | Jun 18 9:58 PM | Laurie StelzerDirector | Grant/Award | 17,340 | $36.73 | 17,340(D) | View → |
| Jun 17, 2026 | Jun 18 9:48 PM | Joanne L. VineyDirector | Grant/Award | 17,340 | $36.73 | 17,340(D) | View → |
| Jun 17, 2026 | Jun 18 9:45 PM | Peter A. ThompsonDirector | Grant/Award | 17,340 | $36.73 | 17,340(D) | View → |
| Jun 17, 2026 | Jun 18 9:41 PM | RA CAPITAL MANAGEMENT, L.P.Director, 10% Owner | Grant/Award | 17,340 | $36.73 | 17,340(I) | View → |
| Jun 17, 2026 | Jun 18 9:39 PM | Marcella K. RuddyDirector | Grant/Award | 17,340 | $36.73 | 17,340(D) | View → |
| Jun 17, 2026 | Jun 18 9:37 PM | Joshua ResnickDirector | Grant/Award | 17,340 | $36.73 | 17,340(D) | View → |
| Jun 17, 2026 | Jun 18 9:35 PM | Harold Edward FlemingDirector | Grant/Award | 17,340 | $36.73 | 17,340(D) | View → |
| Jun 17, 2026 | Jun 18 9:33 PM | Paul J ClancyDirector | Grant/Award | 17,340 | $36.73 | 17,340(D) | View → |
| Jun 17, 2026 | Jun 18 9:29 PM | Bruce BoothDirector | Grant/Award | 17,340 | $36.73 | 17,340(D) | View → |
| Mar 5, 2026 | Mar 6 11:56 PM | Jennifer FitzpatrickChief Legal Officer | Option Exercise | 10,250 | $6.11 | 50,935(D) | View → |