Sionna Therapeutics, Inc. (SION) Insider Ownership

Historic Insider Ownership Trends

Through the 90-day period concluding January 09, 2026, Sionna Therapeutics's top three insider stakeholders include TenPercentOwner Gp A, Llc Tpg (6.74Mn shares), TenPercentOwner Venture Fund Xi, L.P. Atlas (3.69Mn shares), Director Peter A. Thompson (3.56Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
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 3,561,655 29 Dec, 2025
Peter A. Thompson 3,561,655 29 Dec, 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.

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
24 Dec, 2025 Advisors Llc Orbimed Common Stock D 33,356 $44.55 3,561,655 I S
24 Dec, 2025 Peter A. Thompson Common Stock D 33,356 $44.55 3,561,655 I S
19 Dec, 2025 Advisors Llc Orbimed Common Stock D 875 $44.49 3,595,011 I S
19 Dec, 2025 Peter A. Thompson Common Stock D 875 $44.49 3,595,011 I S
18 Dec, 2025 Advisors Llc Orbimed Common Stock D 100 $44.49 3,595,886 I S
18 Dec, 2025 Peter A. Thompson Common Stock D 100 $44.49 3,595,886 I S
17 Dec, 2025 Advisors Llc Orbimed Common Stock D 900 $44.50 3,595,986 I S
17 Dec, 2025 Peter A. Thompson Common Stock D 900 $44.50 3,595,986 I S
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
26 Nov, 2025 Advisors Llc Orbimed Common Stock D 1,600 $44.49 3,596,886 I S
26 Nov, 2025 Peter A. Thompson Common Stock D 1,600 $44.49 3,596,886 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
24 Nov, 2025 Advisors Llc Orbimed Common Stock D 94,583 $44.54 3,610,376 I S
24 Nov, 2025 Peter A. Thompson Common Stock D 94,583 $44.54 3,610,376 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 1,210 $39.50 6,897,623 I S
21 Nov, 2025 Capital Management, L.P. Ra Common Stock D 7,609 $39.50 159,033 I S
21 Nov, 2025 Capital Management, L.P. Ra Common Stock D 9,924 $39.50 650,307 I S