Sionna Therapeutics's top three insider shareholders as of June 12, 2026 are Gp A, Llc Tpg (TenPercentOwner, 6.49Mn shares), Peter A. Thompson (Director, 3.70Mn shares), Venture Fund Xi, L.P. Atlas (TenPercentOwner, 3.69Mn shares).
| Holder | Position | Shares (Direct) | Shares (Indirect) | Report Date |
|---|---|---|---|---|
| Advisors Llc Orbimed | - | 0 | 2,964,774 | 21 Apr, 2026 |
| Capital Management, L.P. Ra | - | 0 | 159,033 | 24 Nov, 2025 |
| Peter A. Thompson | - | 0 | 3,704,959 | 10 Feb, 2025 |
| Bruce Booth | - | 0 | 2,995,602 | 21 Oct, 2025 |
| Michael Cloonan | President Ceo | 547,343 | 0 | 22 Oct, 2025 |
| Venture Fund Xi, L.P. Atlas | - | 2,886,293 | 807,727 | 10 Feb, 2025 |
| Elena Ridloff | Cfo Head Of Corp. Dev. | 38,532 | 0 | 03 Sep, 2025 |
| Gp A, Llc Tpg | - | 0 | 6,494,962 | 26 Jan, 2026 |
* 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 |