Sionna Therapeutics, Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| OrbiMed Capital GP VIII LLC | — | Sale | 33,356 | $44.55 | $1,486,010 | 3,561,655 | Dec 24, 2025 |
| Thompson Peter A. | — | Sale | 33,356 | $44.55 | $1,486,010 | 3,561,655 | Dec 24, 2025 |
| Thompson Peter A. | — | Sale | 900 | $44.50 | $40,050 | 3,595,986 | Dec 18, 2025 |
| OrbiMed Capital GP VIII LLC | — | Sale | 875 | $44.49 | $38,929 | 3,595,011 | Dec 17, 2025 |
| Fitzpatrick Jennifer | Chief Legal Officer | Option Exercise | 10,250 | $6.11 | $62,628 | 10,250 | Dec 5, 2025 |
| Thompson Peter A. | — | Sale | 94,583 | $44.54 | $4,212,727 | 3,610,376 | Nov 25, 2025 |
| ORBIMED ADVISORS LLC | — | Sale | 11,890 | $44.60 | $530,294 | 3,598,486 | Nov 24, 2025 |
| Kolchinsky Peter | — | Sale | 788 | $40.50 | $31,914 | 660,231 | Nov 20, 2025 |
| RA CAPITAL MANAGEMENT, L.P. | — | Sale | 2,092 | $39.57 | $82,780 | 182,527 | Nov 17, 2025 |
| RA Capital Nexus Fund III, L.P. | — | Sale | 14,116 | $39.50 | $557,582 | 6,909,249 | Oct 24, 2025 |
| Cloonan Michael | President & CEO | Option Exercise | 30,049 | $6.11 | $183,599 | 577,392 | Oct 21, 2025 |
| Booth Bruce | — | Sale | 22,339 | $32.69 | $730,262 | 2,360,156 | Oct 21, 2025 |
| Booth Bruce | — | Sale | 12,888 | $33.38 | $430,201 | 2,479,288 | Oct 16, 2025 |
| Cloonan Michael | President & CEO | Option Exercise | 14,775 | $6.11 | $90,275 | 562,118 | Oct 15, 2025 |
| Booth Bruce | — | Sale | 105 | $29.95 | $3,145 | 771,762 | Oct 15, 2025 |
| Booth Bruce | — | Sale | 6,548 | $30.00 | $196,440 | 787,527 | Oct 3, 2025 |
| Booth Bruce | — | Sale | 54,637 | $30.09 | $1,644,027 | 2,831,656 | Oct 1, 2025 |
| Cloonan Michael | President & CEO | Sale | 7,793 | $29.70 | $231,452 | 547,343 | Sep 29, 2025 |
| Fitzpatrick Jennifer | Chief Legal Officer | Option Exercise | 10,250 | $6.11 | $62,628 | 10,250 | Sep 4, 2025 |
| Ridloff Elena | CFO & Head of Corp. Dev. | Sale | 8,836 | $25.08 | $221,607 | 38,532 | Aug 29, 2025 |
| Ridloff Elena | CFO & Head of Corp. Dev. | Sale | 16,098 | $25.97 | $418,065 | 48,116 | Aug 27, 2025 |
| Cloonan Michael | President & CEO | Sale | 7,426 | $25.01 | $185,724 | 547,343 | Aug 26, 2025 |
| Cloonan Michael | President & CEO | Option Exercise | 25,000 | $6.11 | $152,750 | 572,343 | Aug 20, 2025 |
| Ridloff Elena | CFO & Head of Corp. Dev. | Sale | 17,500 | $22.69 | $397,075 | 71,532 | Aug 19, 2025 |
| COULTER JAMES G | — | Purchase | 60,000 | $15.84 | $950,400 | 6,744,962 | Jun 27, 2025 |
| Booth Bruce | — | C | 2,886,293 | — | — | 2,886,293 | Feb 10, 2025 |
| Thompson Peter A. | — | C | 3,154,959 | — | — | 3,154,959 | Feb 10, 2025 |
| Atlas Venture Fund XI, L.P. | — | C | 2,886,293 | — | — | 2,886,293 | Feb 10, 2025 |
| OrbiMed Capital GP VIII LLC | — | Purchase | 550,000 | $18.00 | $9,900,000 | 3,704,959 | Feb 10, 2025 |
| RA CAPITAL MANAGEMENT, L.P. | — | Purchase | 102,414 | $18.00 | $1,843,452 | 2,324,498 | Feb 10, 2025 |
| TPG GP A, LLC | — | Purchase | 1,125,000 | $18.00 | $20,250,000 | 6,684,962 | Feb 10, 2025 |