SION

Healthcare

Sionna Therapeutics, Inc.

$37.13+0.46 (+1.24%)

Prev Close

$36.68

Open

$36.68

High

$37.95

Low

$36.21

Volume

257.8K

Market Cap

$1.67B

P/E

—

Div Yield

—

Over the past 12 months, insider activity at Sionna Therapeutics, Inc. (SION) has been exclusively selling, with 0 insider purchases totaling $0.00 and 23 insider sales totaling $51.90M. The most recent insider transaction was by Fitzpatrick Jennifer (officer: Chief Legal Officer), who sold $347.0K worth of shares on Mar 6, 2026. Sionna Therapeutics, Inc. operates in the Healthcare sector, within the Biotechnology industry, with a market cap of $1.67B.

Buys (12M)

$0.00

Sells (12M)

$51.90M

Net Activity

Net Seller

$51.90M

Active Insiders

last 12 mo

SION Price Chart

SION Insider Trading Activity

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Mar 6, 2026↗	Fitzpatrick Jennifer	officer: Chief Legal Officer	Sell	10,250	$33.86	$347.0K	0
Feb 4, 2026↗	ORBIMED ADVISORS LLC	director	Sell	30,953	$44.58	$1.38M	3,559,760
Feb 4, 2026↗	Thompson Peter A.	director	Sell	30,953	$44.58	$1.38M	3,559,760
Feb 2, 2026↗	Thompson Peter A.	Director	Sell	30,953	$44.58	$1.38M	0
Jan 26, 2026↗	TPG GP A, LLC	10 percent owner	Sell	250,000	$40.00	$10.00M	6,494,960
Dec 24, 2025↗	Thompson Peter A.	Director	Sell	33,356	$44.55	$1.49M	0
Dec 17, 2025↗	Thompson Peter A.	Director	Sell	1,875	$44.49	$83.4K	0
Dec 5, 2025↗	Fitzpatrick Jennifer	Chief Legal Officer	Sell	10,250	$40.52	$415.3K	0
Nov 24, 2025↗	Thompson Peter A.	Director	Sell	108,073	$44.55	$4.81M	0
Oct 21, 2025↗	Booth Bruce	Director	Sell	88,878	$34.22	$3.04M	0
Oct 21, 2025↗	Cloonan Michael	President & CEO	Sell	99,800	$36.26	$3.62M	0
Oct 16, 2025↗	Booth Bruce	Director	Sell	286,369	$32.30	$9.25M	0
Oct 15, 2025↗	Cloonan Michael	President & CEO	Sell	25,200	$31.28	$788.2K	0
Oct 10, 2025↗	Booth Bruce	Director	Sell	194,932	$30.47	$5.94M	0
Oct 3, 2025↗	Booth Bruce	Director	Sell	49,546	$29.99	$1.49M	0
Sep 29, 2025↗	Booth Bruce	Director	Sell	78,693	$30.08	$2.37M	0
Sep 26, 2025↗	Cloonan Michael	President & CEO	Sell	25,000	$29.11	$727.8K	0
Sep 4, 2025↗	Fitzpatrick Jennifer	Chief Legal Officer	Sell	10,250	$23.12	$237.0K	0
Aug 29, 2025↗	Ridloff Elena	CFO & Head of Corp. Dev.	Sell	9,584	$25.09	$240.4K	0
Aug 26, 2025↗	Cloonan Michael	President & CEO	Sell	25,000	$24.97	$624.4K	0
Aug 26, 2025↗	Ridloff Elena	CFO & Head of Corp. Dev.	Sell	23,416	$25.70	$601.9K	0
Aug 20, 2025↗	Cloonan Michael	President & CEO	Sell	25,000	$22.75	$568.8K	0
Aug 19, 2025↗	Ridloff Elena	CFO & Head of Corp. Dev.	Sell	52,000	$21.62	$1.12M	0

SION Insider Buying Activity

The following table shows recent insider purchases of Sionna Therapeutics, Inc. (SION) stock reported via SEC Form 4 filings.

No insider buying activity found for SION in the last 12 months.

SION Insider Selling Activity

The following table shows recent insider sales of Sionna Therapeutics, Inc. (SION) stock reported via SEC Form 4 filings.

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Mar 6, 2026↗	Fitzpatrick Jennifer	officer: Chief Legal Officer	Sell	10,250	$33.86	$347.0K	0
Feb 4, 2026↗	ORBIMED ADVISORS LLC	director	Sell	30,953	$44.58	$1.38M	3,559,760
Feb 4, 2026↗	Thompson Peter A.	director	Sell	30,953	$44.58	$1.38M	3,559,760
Feb 2, 2026↗	Thompson Peter A.	Director	Sell	30,953	$44.58	$1.38M	0
Jan 26, 2026↗	TPG GP A, LLC	10 percent owner	Sell	250,000	$40.00	$10.00M	6,494,960
Dec 24, 2025↗	Thompson Peter A.	Director	Sell	33,356	$44.55	$1.49M	0
Dec 17, 2025↗	Thompson Peter A.	Director	Sell	1,875	$44.49	$83.4K	0
Dec 5, 2025↗	Fitzpatrick Jennifer	Chief Legal Officer	Sell	10,250	$40.52	$415.3K	0
Nov 24, 2025↗	Thompson Peter A.	Director	Sell	108,073	$44.55	$4.81M	0
Oct 21, 2025↗	Booth Bruce	Director	Sell	88,878	$34.22	$3.04M	0
Oct 21, 2025↗	Cloonan Michael	President & CEO	Sell	99,800	$36.26	$3.62M	0
Oct 16, 2025↗	Booth Bruce	Director	Sell	286,369	$32.30	$9.25M	0
Oct 15, 2025↗	Cloonan Michael	President & CEO	Sell	25,200	$31.28	$788.2K	0
Oct 10, 2025↗	Booth Bruce	Director	Sell	194,932	$30.47	$5.94M	0
Oct 3, 2025↗	Booth Bruce	Director	Sell	49,546	$29.99	$1.49M	0
Sep 29, 2025↗	Booth Bruce	Director	Sell	78,693	$30.08	$2.37M	0
Sep 26, 2025↗	Cloonan Michael	President & CEO	Sell	25,000	$29.11	$727.8K	0
Sep 4, 2025↗	Fitzpatrick Jennifer	Chief Legal Officer	Sell	10,250	$23.12	$237.0K	0
Aug 29, 2025↗	Ridloff Elena	CFO & Head of Corp. Dev.	Sell	9,584	$25.09	$240.4K	0
Aug 26, 2025↗	Cloonan Michael	President & CEO	Sell	25,000	$24.97	$624.4K	0
Aug 26, 2025↗	Ridloff Elena	CFO & Head of Corp. Dev.	Sell	23,416	$25.70	$601.9K	0
Aug 20, 2025↗	Cloonan Michael	President & CEO	Sell	25,000	$22.75	$568.8K	0
Aug 19, 2025↗	Ridloff Elena	CFO & Head of Corp. Dev.	Sell	52,000	$21.62	$1.12M	0