Sionna Therapeutics, Inc. (SION) Insider Ownership

Historic Insider Ownership Trends

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).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
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