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 |
|---|---|---|---|---|---|---|---|---|
| Oct 21, 2025 | Oct 21 8:21 PM | Atlas Venture Fund XI, LP | Proposed Sale | 73,460 | $32.20 | $2.4M | — | View → |
| Oct 21, 2025 | Oct 21 8:19 PM | MICHAEL CLOONAN | Proposed Sale | 99,800 | $32.20 | $3.2M | — | View → |
| Oct 20, 2025 | Oct 20 8:46 PM | Atlas Venture Fund XI, LP | Proposed Sale | 46,273 | $31.93 | $1.5M | — | View → |
| Oct 20, 2025 | Oct 20 8:46 PM | Atlas Venture Opportunity Fund II, L.P. | Proposed Sale | 9,712 | $31.93 | $310.1K | — | View → |
| Oct 17, 2025 | Oct 17 8:27 PM | Atlas Venture Opportunity Fund II, L.P. | Proposed Sale | 10,604 | $32.71 | $346.9K | — | View → |
| Oct 17, 2025 | Oct 17 8:27 PM | Atlas Venture Fund XI, LP | Proposed Sale | 50,520 | $32.72 | $1.7M | — | View → |
| Oct 16, 2025 | Oct 16 9:01 PM | Atlas Venture Fund XI, LP | Proposed Sale | 139,897 | $30.91 | $4.3M | — | View → |
| Oct 16, 2025 | Oct 16 9:00 PM | Atlas Venture Opportunity Fund II, L.P. | Proposed Sale | 29,363 | $30.91 | $907.6K | — | View → |
| Oct 16, 2025 | Oct 16 8:34 PM | MICHAEL CLOONAN | Proposed Sale | 200 | $30.91 | $6.2K | — | View → |
| Oct 15, 2025 | Oct 15 8:38 PM | MICHAEL CLOONAN | Proposed Sale | 25,000 | $29.94 | $748.5K | — | View → |
| Oct 14, 2025 | Oct 14 8:23 PM | Atlas Venture Fund XI, LP | Proposed Sale | 48,631 | $29.42 | $1.4M | — | View → |
| Oct 14, 2025 | Oct 14 8:22 PM | Atlas Venture Opportunity Fund II, L.P. | Proposed Sale | 10,207 | $29.42 | $300.3K | — | View → |
| Oct 10, 2025 | Oct 10 8:24 PM | Atlas Venture Opportunity Fund II, L.P. | Proposed Sale | 3,511 | $28.35 | $99.5K | — | View → |
| Oct 10, 2025 | Oct 10 8:24 PM | Atlas Venture Fund XI, LP | Proposed Sale | 16,727 | $28.35 | $474.2K | — | View → |
| Oct 6, 2025 | Oct 6 8:51 PM | Atlas Venture Opportunity Fund II, L.P. | Proposed Sale | 2,047 | $30.01 | $61.4K | — | View → |
| Oct 6, 2025 | Oct 6 8:51 PM | Atlas Venture Fund XI, LP | Proposed Sale | 9,753 | $30.01 | $292.7K | — | View → |
| Oct 3, 2025 | Oct 3 8:44 PM | Atlas Venture Opportunity Fund II, L.P. | Proposed Sale | 6,548 | $29.30 | $191.9K | — | View → |
| Oct 3, 2025 | Oct 3 8:44 PM | Atlas Venture Fund XI, LP | Proposed Sale | 31,198 | $29.30 | $914.1K | — | View → |
| Oct 1, 2025 | Oct 1 8:17 PM | Atlas Venture Fund XI, LP | Proposed Sale | 165 | $29.41 | $4.9K | — | View → |
| Oct 1, 2025 | Oct 1 8:17 PM | Atlas Venture Opportunity Fund II, L.P. | Proposed Sale | 35 | $29.41 | $1.0K | — | View → |
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 → |