SION insider buying – Sionna Therapeutics, Inc.
4 insider purchases since 2016 worth $32.2M by 4 different insiders. Last 12 months: 0 purchases, $0. Most recent filing: 2025-07-01.
Same time range as the chart above - each mark sits under the week of the trade. Circles = purchases (height = price paid, size = amount), red triangles = open-market sales of $50k+. Prices as reported, not adjusted for later stock splits.
Purchases are open-market buys (SEC Form 4, code "P") - insiders paying with their own money. Sales are open-market sales (code "S") of $50,000 or more; many sales are pre-planned (Rule 10b5-1) or made for taxes and diversification. Each row links to the original filing.
Bought, sold, still holding?
| Insider | Bought | First / last buy | Sold since 2016 | Holds now* | Status |
|---|---|---|---|---|---|
| RA CAPITAL MANAGEMENT, L.P. Director | $20.2M 1× · 1,125,000 sh | 2025-02-10 2025-02-10 | 2× · $27.3M last 2026-09-17 | 3,448,812 shares as of 2026-09-21 | Sold part |
| OrbiMed Capital GP VIII LLC Director | $9.9M 1× · 550,000 sh | 2025-02-10 2025-02-10 | 2× · $5.2M last 2026-07-07 | 2,469,959 shares as of 2026-07-09 | Sold part |
| Booth Bruce Director | $1.1M 1× · 60,000 sh | 2025-02-10 2025-02-10 | 5× · $22.1M last 2025-10-21 | 3,057,453 shares as of 2025-10-21 | Sold part |
| COULTER JAMES G 10% Owner | $950,400 1× · 60,000 sh | 2025-06-27 2025-06-27 | – | 6,744,962 shares as of 2025-07-01 | Holds - never sold |
* Shares held after the insider's most recent SEC filing for this company (all share classes, direct and indirect). If an insider stops filing, later changes are not known.
Insider buying and selling by year
| Year | Purchases | Bought | Buyers | Sales | Sold |
|---|---|---|---|---|---|
| 2026 | 0 | – | – | 10 | $81.9M |
| 2025 | 4 | $32.2M | 4 | 21 | $58.9M |
Insider purchases
| Filed | Insider | Role | Shares | Avg price | Value | Holdings | Filing |
|---|---|---|---|---|---|---|---|
| 2025-07-01 | COULTER JAMES G | 10% Owner | 60,000 | $15.84 | $950,400 | +0.9% | SEC |
| 2025-02-10 | RA CAPITAL MANAGEMENT, L.P. | Director | 1,125,000 | $18.00 | $20.2M | +19.4% | SEC |
| 2025-02-10 | OrbiMed Capital GP VIII LLC | Director | 550,000 | $18.00 | $9.9M | +17.4% | SEC |
| 2025-02-10 | Booth Bruce | Director | 60,000 | $18.00 | $1.1M | +8.0% | SEC |
Insider sales
| Filed | Insider | Role | Shares | Avg price | Value | Type | Filing |
|---|---|---|---|---|---|---|---|
| 2026-09-21 | RA CAPITAL MANAGEMENT, L.P. | Director | 3,448,811 | $6.33 | $21.8M | Sale | SEC |
| 2026-07-09 | OrbiMed Capital GP VIII LLC | Director | 85,918 | $44.86 | $3.9M | Pre-planned (10b5-1) | SEC |
| 2026-07-07 | Fitzpatrick Jennifer | Officer | 10,250 | $43.60 | $446,900 | Pre-planned (10b5-1) | SEC |
| 2026-07-02 | ORBIMED ADVISORS LLC | Director | 115,844 | $45.50 | $5.3M | Pre-planned (10b5-1) | SEC |
| 2026-05-11 | ORBIMED ADVISORS LLC | Director | 292,952 | $45.62 | $13.4M | Pre-planned (10b5-1) | SEC |
| 2026-04-21 | ORBIMED ADVISORS LLC | Director | 55,345 | $44.67 | $2.5M | Pre-planned (10b5-1) | SEC |
| 2026-04-16 | ORBIMED ADVISORS LLC | Director | 510,583 | $44.94 | $22.9M | Pre-planned (10b5-1) | SEC |
| 2026-03-06 | Fitzpatrick Jennifer | Officer | 10,250 | $33.86 | $347,065 | Pre-planned (10b5-1) | SEC |
| 2026-02-04 | OrbiMed Capital GP VIII LLC | Director | 30,953 | $44.58 | $1.4M | Pre-planned (10b5-1) | SEC |
| 2026-01-26 | WINKELRIED JON | 10% Owner | 250,000 | $40.00 | $10.0M | Sale | SEC |
| 2025-12-29 | Thompson Peter A. | Director | 33,356 | $44.55 | $1.5M | Pre-planned (10b5-1) | SEC |
| 2025-12-19 | Thompson Peter A. | Director | 1,875 | $44.49 | $83,428 | Pre-planned (10b5-1) | SEC |
| 2025-12-09 | Fitzpatrick Jennifer | Officer | 10,250 | $40.52 | $415,330 | Pre-planned (10b5-1) | SEC |
| 2025-11-26 | Thompson Peter A. | Director | 108,073 | $44.55 | $4.8M | Pre-planned (10b5-1) | SEC |
| 2025-11-24 | Kolchinsky Peter | Director | 30,316 | $39.61 | $1.2M | Sale | SEC |
Showing the latest 15 of 31 sales of $50,000+ since 2016.
Compiled automatically from public SEC filings. Not investment advice. Get every new insider purchase in the daily report.
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