Sionna Therapeutics Ownership & Insider Activity

Sionna Therapeutics Inc

SIONNASDAQ

$3.89

-0.19-4.66%

Last update: Oct 16, 4:26 PM

$3.89

-0.19-4.66%

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

Insiders own 2.4% of shares outstanding. Institutional investors hold 18.0%. Over the past 90 days, insiders made 1 sale worth $21.8M.

Shares Outstanding

45.212M

Shares Float

27.870M

Insider Shares Owned

1.083M

Insider % Owned

2.4%

Institutional Shares Held

8.138M

Institutional % Held

18.0%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$21.8M total

Net Activity

Net Selling

Net Value (90d)

-$21.8M

Date	Insider	Title	Type	Shares	Price	Value
Sep 17, 2026	RA CAPITAL MANAGEMENT LP, RA Capital Healthcare Fund LP, RA Capital Nexus Fund LP, RA Capital Nexus Fund III LP, Peter Kolchinsky, Rajeev Shah	DIRECTOR	SELL	3.449M	$6.33	$21.8M
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