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Sionna Therapeutics, Inc.

SION Net selling

CIK 0002036042 #3720 in the set updated 22 Sep 2026

Bought (1 mo)

$0.00

out of their own pocket, the only kind of buying there is

Sold (1 mo)

$21.84M

$0.00 on a plan · $0.00 straight out of an exercise

Sold at will

$21.84M

2 of 2 sales

Net

−$21.84M

−$21.84M against sales at will

By person

10 insiders · 2 transactions

Insider

Role

Bought

Sold

Net

Holding

Of company

Worth

Change

RA CAPITAL MANAGEMENT, L.P. entity

Director

—

$21.84M (2)

−$21.84M

318,066

0.7035%

$2.37M

—

TPG GP A, LLC entity

10% owner

—

6,494,962

14.37%

$48.45M

+849.0%

Atlas Venture Fund XI, L.P. entity

10% owner

—

3,694,020

8.17%

$27.56M

—

Thompson Peter A.

Director

—

2,469,959

5.46%

$18.43M

—

ORBIMED ADVISORS LLC entity

Director

—

2,469,959

5.46%

$18.43M

—

Cloonan Michael

President & CEO

—

765,393

1.69%

$5.71M

+39.8%

Booth Bruce

Director

—

686,567

1.52%

$5.12M

—

Ridloff Elena

CFO and CBO

—

133,069

0.2943%

$992.69K

+7.7%

McKee Charlotte

CMO and Head of R&D

—

128,415

0.2840%

$957.98K

+351.9%

Fitzpatrick Jennifer

CLO and Head of Program Mgmt.

—

56,265

0.1244%

$419.74K

—

Individual transactions

Nothing of that kind in this period.

What was left out

Form 4 filings counted 5

Amendments (4/A) skipped 0

Filings about a different issuer 0

Unreadable filings 0

Joint filings 1

Sales on a Rule 10b5-1 plan 0

Sales straight out of an exercise 0

Sales at will 2

Transactions with no price 0

Shares from compensation/vesting 468,852

History held since 10 Feb 2025