Sionna Therapeutics Ownership & Insider Activity

Sionna Therapeutics Inc

SIONNASDAQ

$5.91

-0.55-8.51%

At close: Aug 14, 5:00 PM EST

$5.79

-0.67-10.37%

Pre-Market: 5:44 AM EST

Sionna Therapeutics (SION) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 1.4% of shares outstanding. Institutional investors hold 22.1%. Over the past 90 days, insiders made 6 sales worth $18.3M.

Shares Outstanding

45.212M

Shares Float

27.870M

Insider Shares Owned

614.290K

Insider % Owned

1.4%

Institutional Shares Held

9.999M

Institutional % Held

22.1%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$18.3M total

Net Activity

Net Selling

Net Value (90d)

-$18.3M

Date	Insider	Title	Type	Shares	Price	Value
Jul 7, 2026	Peter A Thompson	DIRECTOR	SELL	85.918K	$44.86	$3.9M
Jul 7, 2026	ORBIMED ADVISORS LLC, OrbiMed Capital GP VIII LLC	DIRECTOR	SELL	85.918K	$44.86	$3.9M
Jul 6, 2026	Jennifer Fitzpatrick	CHIEF LEGAL OFFICER	SELL-OPTIONS	—	$24.85	$384K
Jun 30, 2026	Peter A Thompson	DIRECTOR	SELL	115.844K	$45.50	$5.3M
Jun 30, 2026	ORBIMED ADVISORS LLC, OrbiMed Capital GP VIII LLC	DIRECTOR	SELL	115.844K	$45.50	$5.3M
May 27, 2026	Peter A Thompson	DIRECTOR	SELL	101.000	$44.49	$4K
May 27, 2026	ORBIMED ADVISORS LLC, OrbiMed Capital GP VIII LLC	DIRECTOR	SELL	101.000	$44.49	$4K
May 7, 2026	Peter A Thompson	DIRECTOR	SELL	292.952K	$45.62	$13.4M
May 7, 2026	ORBIMED ADVISORS LLC, OrbiMed Capital GP VIII LLC	DIRECTOR	SELL	292.952K	$45.62	$13.4M
Apr 17, 2026	Peter A Thompson	DIRECTOR	SELL	55.345K	$44.67	$2.5M
Apr 17, 2026	ORBIMED ADVISORS LLC, OrbiMed Capital GP VIII LLC	DIRECTOR	SELL	55.345K	$44.67	$2.5M
Apr 14, 2026	Peter A Thompson	DIRECTOR	SELL	510.583K	$44.94	$22.9M
Apr 14, 2026	ORBIMED ADVISORS LLC, OrbiMed Capital GP VIII LLC	DIRECTOR	SELL	510.583K	$44.94	$22.9M
Mar 5, 2026	Jennifer Fitzpatrick	CHIEF LEGAL OFFICER	SELL-OPTIONS	—	$19.98	$284K