Sionna Therapeutics, Inc.
SION
31 insider filings · Latest: Sep 17, 2026
Common Stock Transactions
| Txn Date | Accepted | Insider | Type | Shares | Avg Price | Value | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|---|
| Oct 28, 2025 | Oct 28 9:07 PM | RA Capital Healthcare Fund LP | Proposed Sale | 3,624 | $39.45 | $143.0K | — | View → |
| Oct 28, 2025 | Oct 28 9:05 PM | RA Capital Nexus Fund, L.P. | Proposed Sale | 31,392 | $39.45 | $1.2M | — | View → |
| Oct 28, 2025 | Oct 28 8:57 PM | BLACKWELL PARTNERS LLC - SERIES A | Proposed Sale | 10,476 | $39.45 | $413.3K | — | View → |
| Oct 24, 2025 | Oct 24 10:05 PM | RA Capital Nexus Fund, L.P. | Proposed Sale | 122,271 | $39.21 | $4.8M | — | View → |
| Oct 24, 2025 | Oct 24 10:00 PM | RA Capital Nexus Fund III, L.P. | Proposed Sale | 66,672 | $39.21 | $2.6M | — | View → |
| Oct 24, 2025 | Oct 24 9:53 PM | RA Capital Healthcare Fund LP | Proposed Sale | 14,116 | $39.21 | $553.5K | — | View → |
| Oct 24, 2025 | Oct 24 9:39 PM | BLACKWELL PARTNERS LLC - SERIES A | Proposed Sale | 107,941 | $39.21 | $4.2M | — | View → |
| Oct 21, 2025 | Oct 21 8:22 PM | Atlas Venture Opportunity Fund II, L.P. | Proposed Sale | 15,418 | $32.20 | $496.5K | — | View → |
| 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 → |
Stock Options & Derivatives
| Txn Date | Accepted | Insider | Type | Shares | Exercise Price | Shares Owned | Filing |
|---|---|---|---|---|---|---|---|
| Sep 17, 2026 | Sep 18 8:59 PM | Elena RidloffCFO and CBO | Grant/Award | 165,440 | — | 165,440(D) | View → |
| Sep 17, 2026 | Sep 18 8:59 PM | Elena RidloffCFO and CBO | Disposition | 165,440 | $39.21 | 0(D) | View → |
| Sep 17, 2026 | Sep 18 8:58 PM | Charlotte MckeeCMO and Head of R&D | Disposition | 155,700 | $39.21 | 0(D) | View → |
| Sep 17, 2026 | Sep 18 8:58 PM | Charlotte MckeeCMO and Head of R&D | Grant/Award | 155,700 | — | 155,700(D) | View → |
| Sep 17, 2026 | Sep 18 8:56 PM | Jennifer FitzpatrickCLO and Head of Program Mgmt. | Disposition | 103,140 | $39.21 | 0(D) | View → |
| Sep 17, 2026 | Sep 18 8:56 PM | Jennifer FitzpatrickCLO and Head of Program Mgmt. | Grant/Award | 103,140 | — | 103,140(D) | View → |
| Sep 17, 2026 | Sep 18 8:52 PM | Michael CloonanDirector, President & CEO | Grant/Award | 436,100 | — | 436,100(D) | View → |
| Sep 17, 2026 | Sep 18 8:52 PM | Michael CloonanDirector, President & CEO | Disposition | 436,100 | $39.21 | 0(D) | View → |
| Jul 6, 2026 | Jul 7 8:38 PM | Jennifer FitzpatrickChief Legal Officer | Option Exercise | 10,250 | $6.11 | 40,685(D) | View → |
| 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 → |