Sionna Therapeutics's three largest insider shareholders as of April 28, 2026 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 |
| Gp A, Llc Tpg | - | 0 | 6,494,962 | 26 Jan, 2026 |
| Gp A, Llc Tpg | - | 0 | 6,494,962 | 26 Jan, 2026 |
| Peter A. Thompson | - | 0 | 3,704,959 | 10 Feb, 2025 |
| Advisors Llc Orbimed | - | 0 | 3,020,119 | 16 Apr, 2026 |
| Bruce Booth | - | 0 | 2,995,602 | 21 Oct, 2025 |
| 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 | Peter A. Thompson | Common Stock | D | 52,397 | $44.68 | 2,967,722 | I | S |
| 17 Apr, 2026 | Advisors Llc Orbimed | 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 | Peter A. Thompson | Common Stock | D | 226,906 | $45.34 | 3,020,119 | I | S |
| 16 Apr, 2026 | Advisors Llc Orbimed | 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 | Advisors Llc Orbimed | Common Stock | D | 1,890 | $44.57 | 3,559,765 | I | S |
| 02 Feb, 2026 | Peter A. Thompson | Common Stock | D | 1,890 | $44.57 | 3,559,765 | I | S |
| 03 Feb, 2026 | Peter A. Thompson | Common Stock | D | 29,063 | $44.58 | 3,530,702 | I | S |
| 03 Feb, 2026 | Advisors Llc Orbimed | 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 |
| 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 |