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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
2025-10-14 Booth Bruce Director Sale 10b5-1 −105 $29.95 $3K 771,762
2025-10-13 Booth Bruce Director Sale 10b5-1 −44,048 $30.32 $1.3M 2,719,526
2025-10-13 Booth Bruce Director Sale 10b5-1 −9,245 $30.32 $280K 772,724
2025-10-13 Booth Bruce Director Sale 10b5-1 −4,082 $31.03 $127K 2,715,444
2025-10-13 Booth Bruce Director Sale 10b5-1 −857 $31.03 $27K 771,867
2025-10-10 Booth Bruce Director Sale 10b5-1 −16,727 $29.98 $501K 2,763,574
2025-10-10 Booth Bruce Director Sale 10b5-1 −3,511 $29.98 $105K 781,969
2025-10-06 Booth Bruce Director Sale 10b5-1 −9,753 $29.95 $292K 2,780,301
2025-10-06 Booth Bruce Director Sale 10b5-1 −2,047 $29.95 $61K 785,480
2025-10-03 Booth Bruce Director Sale 10b5-1 −31,198 $30.00 $936K 2,790,054
2025-10-03 Booth Bruce Director Sale 10b5-1 −6,548 $30.00 $196K 787,527
2025-10-01 Beer Caroline Stark Chief Business Officer Grant or award · Non-Qualified Stock Option (right to buy) +255,000 255,000
2025-10-01 Booth Bruce Director Sale 10b5-1 −165 $29.95 $5K 2,821,252
2025-10-01 Booth Bruce Director Sale 10b5-1 −35 $29.95 $1K 794,075
2025-09-30 Booth Bruce Director Sale 10b5-1 −10,239 $30.06 $308K 2,821,417
2025-09-30 Booth Bruce Director Sale 10b5-1 −2,149 $30.06 $65K 794,110
2025-09-29 Booth Bruce Director Sale 10b5-1 −54,637 $30.09 $1.6M 2,831,656
2025-09-29 Booth Bruce Director Sale 10b5-1 −11,468 $30.09 $345K 796,259
2025-09-29 Cloonan Michael President & CEO Option exercise 10b5-1 +7,793 $6.11 $48K 555,136
2025-09-29 Cloonan Michael President & CEO Sale 10b5-1 −7,793 $29.70 $231K 547,343

Page 10 of 15 · 284 trades