Through the 90-day period concluding January 09, 2026, Sionna Therapeutics's top three insider stakeholders include TenPercentOwner Gp A, Llc Tpg (6.74Mn shares), TenPercentOwner Venture Fund Xi, L.P. Atlas (3.69Mn shares), Director Peter A. Thompson (3.56Mn shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Gp A, Llc Tpg | 6,744,962 | 01 Jul, 2025 | |
| Venture Fund Xi, L.P. Atlas | 3,694,020 | 10 Feb, 2025 | |
| Advisors Llc Orbimed | 3,561,655 | 29 Dec, 2025 | |
| Peter A. Thompson | 3,561,655 | 29 Dec, 2025 | |
| Bruce Booth | 686,567 | 21 Oct, 2025 | |
| Michael Cloonan | President & Ceo | 547,343 | 22 Oct, 2025 |
| Capital Management, L.P. Ra | 159,033 | 24 Nov, 2025 | |
| Elena Ridloff | Cfo & Head Of Corp. Dev. | 38,532 | 03 Sep, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 24 Dec, 2025 | Advisors Llc Orbimed | Common Stock | D | 33,356 | $44.55 | 3,561,655 | I | S |
| 24 Dec, 2025 | Peter A. Thompson | Common Stock | D | 33,356 | $44.55 | 3,561,655 | I | S |
| 19 Dec, 2025 | Advisors Llc Orbimed | Common Stock | D | 875 | $44.49 | 3,595,011 | I | S |
| 19 Dec, 2025 | Peter A. Thompson | Common Stock | D | 875 | $44.49 | 3,595,011 | I | S |
| 18 Dec, 2025 | Advisors Llc Orbimed | Common Stock | D | 100 | $44.49 | 3,595,886 | I | S |
| 18 Dec, 2025 | Peter A. Thompson | Common Stock | D | 100 | $44.49 | 3,595,886 | I | S |
| 17 Dec, 2025 | Advisors Llc Orbimed | Common Stock | D | 900 | $44.50 | 3,595,986 | I | S |
| 17 Dec, 2025 | Peter A. Thompson | Common Stock | D | 900 | $44.50 | 3,595,986 | I | S |
| 05 Dec, 2025 | Jennifer Fitzpatrick | Common Stock | A | 10,250 | $6.11 | 10,250 | D | M |
| 05 Dec, 2025 | Jennifer Fitzpatrick | Common Stock | D | 10,250 | $40.52 | 0 | D | S |
| 26 Nov, 2025 | Advisors Llc Orbimed | Common Stock | D | 1,600 | $44.49 | 3,596,886 | I | S |
| 26 Nov, 2025 | Peter A. Thompson | Common Stock | D | 1,600 | $44.49 | 3,596,886 | I | S |
| 25 Nov, 2025 | Advisors Llc Orbimed | Common Stock | D | 11,890 | $44.60 | 3,598,486 | I | S |
| 25 Nov, 2025 | Peter A. Thompson | Common Stock | D | 11,890 | $44.60 | 3,598,486 | I | S |
| 24 Nov, 2025 | Advisors Llc Orbimed | Common Stock | D | 94,583 | $44.54 | 3,610,376 | I | S |
| 24 Nov, 2025 | Peter A. Thompson | Common Stock | D | 94,583 | $44.54 | 3,610,376 | I | S |
| 21 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 6,440 | $39.50 | 2,198,082 | I | S |
| 21 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 1,210 | $39.50 | 6,897,623 | I | S |
| 21 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 7,609 | $39.50 | 159,033 | I | S |
| 21 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 9,924 | $39.50 | 650,307 | I | S |