InsiderClue
← All stocks

Sionna Therapeutics, Inc.

SION Net buying
CIK 0002036042 #3720 in the set updated 21 Sep 2026
Bought (120 mo)
$63.41M
out of their own pocket, the only kind of buying there is
Sold (120 mo)
$174.64M
$135.40M on a plan · $7.77M straight out of an exercise
Sold at will
$31.46M
45 of 158 sales
Net
−$111.23M
+$31.95M against sales at will

By person

10 insiders · 166 transactions
Insider
Role
Bought
Sold
Net
Holding
Of company
Worth
Change
ORBIMED ADVISORS LLC entity
Director
$9.90M (1)
$55.67M (20) scheduled
−$45.77M
2,469,959
5.46%
$110.80M
—
Thompson Peter A.
Director
$9.90M (1)
$55.67M (20) scheduled
−$45.77M
2,469,959
5.46%
$110.80M
—
Booth Bruce
Director
$1.08M (1)
$22.09M (50) scheduled
−$21.01M
686,567
1.52%
$30.80M
—
TPG GP A, LLC entity
10% owner
$21.20M (2)
$10.00M (1)
+$11.20M
6,494,962
14.37%
$291.36M
+849.0%
Cloonan Michael
President & CEO
—
$6.33M (12) scheduled
−$6.33M
765,393
1.69%
$34.34M
+39.8%
Ridloff Elena
CFO and CBO
—
$1.97M (7) scheduled
−$1.97M
133,069
0.2943%
$5.97M
+7.7%
Fitzpatrick Jennifer
CLO and Head of Program Mgmt.
—
$1.45M (4) scheduled
−$1.45M
56,265
0.1244%
$2.52M
—
RA CAPITAL MANAGEMENT, L.P. entity
Director
$20.25M (2)
$21.46M (44)
−$1.21M
159,033
0.3517%
$7.13M
—
Atlas Venture Fund XI, L.P. entity
10% owner
$1.08M (1)
—
+$1.08M
3,694,020
8.17%
$165.71M
—
McKee Charlotte
CMO and Head of R&D
—
—
—
128,415
0.2840%
$5.76M
+351.9%

Individual transactions

8
Insider
Date
Role
Action
Shares
Price
Amount
TPG GP A, LLC
27 Jun 2025
10% owner
Buy indirect
60,000
$15.84
$950.40K
Atlas Venture Fund XI, L.P.
10 Feb 2025
10% owner
Buy indirect
60,000
$18.00
$1.08M
Booth Bruce
10 Feb 2025
Director
Buy indirect
60,000
$18.00
$1.08M
Thompson Peter A.
10 Feb 2025
Director
Buy indirect
550,000
$18.00
$9.90M
ORBIMED ADVISORS LLC
10 Feb 2025
Director
Buy indirect
550,000
$18.00
$9.90M
RA CAPITAL MANAGEMENT, L.P.
10 Feb 2025
Director
Buy indirect
102,414
$18.00
$1.84M
RA CAPITAL MANAGEMENT, L.P.
10 Feb 2025
Director
Buy indirect
1,022,586
$18.00
$18.41M
TPG GP A, LLC
10 Feb 2025
10% owner
Buy indirect
1,125,000
$18.00
$20.25M
Show all 166 transactions →

What was left out

Form 4 filings counted 81
Amendments (4/A) skipped 0
Filings about a different issuer 0
Unreadable filings 0
Joint filings 21
Sales on a Rule 10b5-1 plan 97
Sales straight out of an exercise 16
Sales at will 45
Transactions with no price 0
Shares from compensation/vesting 27,114,850
History held since 10 Feb 2025