As of May 22, 2026, Sionna Therapeutics's top three insider holders are Gp A, Llc Tpg (TenPercentOwner, 6.49Mn shares), Gp A, Llc Tpg (TenPercentOwner, 6.49Mn shares), Gp A, Llc Tpg (TenPercentOwner, 6.49Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Gp A, Llc Tpg | - | 0 | 6,494,962 | 26 Jan, 2026 |
| Peter A. Thompson | - | 0 | 3,704,959 | 10 Feb, 2025 |
| Venture Fund Xi, L.P. Atlas | - | 2,886,293 | 807,727 | 10 Feb, 2025 |
| Peter A. Thompson | - | 0 | 3,530,702 | 04 Feb, 2026 |
| Bruce Booth | - | 0 | 2,995,602 | 21 Oct, 2025 |
| Advisors Llc Orbimed | - | 0 | 2,964,774 | 21 Apr, 2026 |
| Peter A. Thompson | - | 0 | 2,964,774 | 21 Apr, 2026 |
| Michael Cloonan | President Ceo | 547,343 | 0 | 22 Oct, 2025 |
| Capital Management, L.P. Ra | - | 0 | 159,033 | 24 Nov, 2025 |
| Elena Ridloff | Cfo Head Of Corp. Dev. | 38,532 | 0 | 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 |
|---|---|---|---|---|---|---|---|---|
| 17 Apr, 2026 | Advisors Llc Orbimed | Common Stock | D | 52,397 | $44.68 | 2,967,722 | I | S |
| 17 Apr, 2026 | Peter A. Thompson | Common Stock | D | 52,397 | $44.68 | 2,967,722 | I | S |
| 18 Apr, 2026 | Peter A. Thompson | Common Stock | D | 2,948 | $44.52 | 2,964,774 | I | S |
| 18 Apr, 2026 | Advisors Llc Orbimed | Common Stock | D | 2,948 | $44.52 | 2,964,774 | I | S |
| 14 Apr, 2026 | Advisors Llc Orbimed | Common Stock | D | 47,814 | $44.51 | 3,482,888 | I | S |
| 14 Apr, 2026 | Peter A. Thompson | Common Stock | D | 47,814 | $44.51 | 3,482,888 | I | S |
| 15 Apr, 2026 | Peter A. Thompson | Common Stock | D | 235,863 | $44.64 | 3,247,025 | I | S |
| 15 Apr, 2026 | Advisors Llc Orbimed | Common Stock | D | 235,863 | $44.64 | 3,247,025 | I | S |
| 16 Apr, 2026 | Advisors Llc Orbimed | Common Stock | D | 226,906 | $45.34 | 3,020,119 | I | S |
| 16 Apr, 2026 | Peter A. Thompson | Common Stock | D | 226,906 | $45.34 | 3,020,119 | I | S |
| 05 Mar, 2026 | Jennifer Fitzpatrick | Common Stock | A | 10,250 | $6.11 | 10,250 | D | M |
| 05 Mar, 2026 | Jennifer Fitzpatrick | Common Stock | D | 10,250 | $33.86 | 0 | D | S |
| 05 Mar, 2026 | Jennifer Fitzpatrick | Non-Qualified Stock Option (right to buy) | D | 10,250 | $0.00 | 50,935 | D | M |
| 02 Feb, 2026 | Peter A. Thompson | Common Stock | D | 1,890 | $44.57 | 3,559,765 | I | S |
| 02 Feb, 2026 | Advisors Llc Orbimed | Common Stock | D | 1,890 | $44.57 | 3,559,765 | I | S |
| 03 Feb, 2026 | Advisors Llc Orbimed | Common Stock | D | 29,063 | $44.58 | 3,530,702 | I | S |
| 03 Feb, 2026 | Peter A. Thompson | Common Stock | D | 29,063 | $44.58 | 3,530,702 | I | S |
| 22 Jan, 2026 | Gp A, Llc Tpg | Common Stock | D | 250,000 | $40.00 | 6,494,962 | I | S |
| 02 Jan, 2026 | Michael Cloonan | Non-Qualified Stock Option (right to buy) | A | 436,100 | $0.00 | 436,100 | D | A |
| 02 Jan, 2026 | Jennifer Fitzpatrick | Non-Qualified Stock Option (right to buy) | A | 103,140 | $0.00 | 103,140 | D | A |