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CIK 0002036042 · Non-accelerated filer<br>Smaller reporting company<br>Emerging growth company

Sionna Therapeutics, Inc.

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Ticker
SION
Exchange
Nasdaq
Industry
Pharmaceutical Preparations
FY end
Dec 31
Incorporated
DE
Entity type
operating
Phone
617-819-2020
Business address
21 HICKORY DRIVE, SUITE 500, WALTHAM, MA, 02451
Open-market buys, last 90 days
$0
in 0 filings
Open-market sales, last 90 days
$21,835,018
in 1 filing

Net −$21,835,018. Shares bought or sold at a price by officers, directors and 10% owners (Form 4 codes P and S). Grants, option exercises and tax withholding aren't counted.

Pace of trading Bought Sold

Who's trading

90 days

  1. RA CAPITAL MANAGEMENT, L.P. −$21.8M Director sold 50% of stake
Date Insider Transaction Shares Price Value Owned after
2025-08-20 Cloonan Michael President & CEO Option exercise · Non-Qualified Stock Option (right to buy) 10b5-1 −25,000 228,142
2025-08-20 Ridloff Elena CFO & Head of Corp. Dev. Sale 10b5-1 −17,500 $22.69 $397K 71,532
2025-08-19 Ridloff Elena CFO & Head of Corp. Dev. Sale 10b5-1 −34,500 $21.08 $727K 89,032
2025-06-27 TPG GP A, LLC 10% owner Purchase +60,000 $15.84 $950K 6,744,962
2025-06-12 Viney Joanne L. Director Grant or award · Non-Qualified Stock Option (right to buy) +19,959 19,959
2025-06-12 Thompson Peter A. Director Grant or award · Non-Qualified Stock Option (right to buy) +19,959 19,959
2025-06-12 Stelzer Laurie Director Grant or award · Non-Qualified Stock Option (right to buy) +19,959 19,959
2025-06-12 Ruddy Marcella K. Director Grant or award · Non-Qualified Stock Option (right to buy) +19,959 19,959
2025-06-12 Resnick Joshua Director Grant or award · Non-Qualified Stock Option (right to buy) +19,959 19,959
2025-06-12 Fleming Harold Edward Director Grant or award · Non-Qualified Stock Option (right to buy) +19,959 19,959
2025-06-12 Clancy Paul J Director Grant or award · Non-Qualified Stock Option (right to buy) +19,959 19,959
2025-06-12 Booth Bruce Director Grant or award · Non-Qualified Stock Option (right to buy) +19,959 19,959
2025-06-12 RA CAPITAL MANAGEMENT, L.P. Director Grant or award · Non-Qualified Stock Option (right to buy) +19,959 19,959
2025-02-10 TPG GP A, LLC 10% owner Conversion +4,875,547 5,559,962
2025-02-10 TPG GP A, LLC 10% owner Purchase +1,125,000 $18.00 $20.3M 6,684,962
2025-02-10 TPG GP A, LLC 10% owner Conversion · Series Seed Preferred Stock −1,276,276 0
2025-02-10 TPG GP A, LLC 10% owner Conversion · Series A Preferred Stock −1,806,318 0
2025-02-10 TPG GP A, LLC 10% owner Conversion · Series B Preferred Stock −2,275,528 0
2025-02-10 TPG GP A, LLC 10% owner Conversion · Series C Preferred Stock −1,765,541 0
2025-02-10 RA CAPITAL MANAGEMENT, L.P. Director Conversion +5,021,990 5,900,779

Page 12 of 15 · 284 trades