Over the 90-day window ending December 12, 2025, Sionna Therapeutics's three dominant insider ownership positions are held by Director Advisors Llc Orbimed (3.60Mn shares), Director Peter A. Thompson (3.60Mn shares), Director Bruce Booth (686.57K 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 | 3,596,886 | 26 Nov, 2025 | |
| Peter A. Thompson | 3,596,886 | 26 Nov, 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 |
|---|---|---|---|---|---|---|---|---|
| 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 |
| 24 Nov, 2025 | Peter A. Thompson | Common Stock | D | 94,583 | $44.54 | 3,610,376 | I | S |
| 24 Nov, 2025 | Advisors Llc Orbimed | Common Stock | D | 94,583 | $44.54 | 3,610,376 | 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 |
| 26 Nov, 2025 | Peter A. Thompson | Common Stock | D | 1,600 | $44.49 | 3,596,886 | I | S |
| 26 Nov, 2025 | Advisors Llc Orbimed | Common Stock | D | 1,600 | $44.49 | 3,596,886 | I | S |
| 20 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 150 | $39.89 | 6,898,929 | I | S |
| 20 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 1,235 | $39.89 | 661,019 | I | S |
| 20 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 801 | $39.89 | 2,205,034 | I | S |
| 20 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 947 | $39.89 | 167,246 | I | S |
| 20 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 96 | $40.50 | 6,898,833 | I | S |
| 20 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 788 | $40.50 | 660,231 | I | S |
| 20 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 512 | $40.50 | 2,204,522 | I | S |
| 20 Nov, 2025 | Capital Management, L.P. Ra | Common Stock | D | 604 | $40.50 | 166,642 | 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 | 9,924 | $39.50 | 650,307 | 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 | 7,609 | $39.50 | 159,033 | I | S |