SIONNA THERAPEUTICS INC

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SION·829401108·US·Common Stock·Healthcare - Biotechnology-Activist

SION (SIONNA THERAPEUTICS INC) is held by 91 institutional investors as of Q2 2026. Largest holders: RA CAPITAL MANAGEMENT, L.P. ($435.7M), TPG GP A, LLC ($285.7M), VIKING GLOBAL INVESTORS LP ($140.6M). Net institutional sentiment: Bullish.

91

Holders

(5 Elite)

$1.5B

Total Value

68% (90)

Consensus

61 buying - 29 selling

13F: Jun 30, 2026Insider & Congress: Updated regularly

Smart Money Verdict

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Institutional (13F)82

Insider (Form 4)61

Activist (13D/13G)37

Congressional (STOCK Act)66

Holder Quality

84

★★★★★

Elite

58

★★★★

Strong

12

★★★

Solid

50

★★

Below

27

★

Weak

Held by 91 funds

5 elite

Who's Trading

Source dates: Price Oct 14, 2026 · Insiders Sep 21, 2026 · Activists Sep 21, 2026 · Congress none

ActivistRA Capital Management, L.P.14.3%Sep 21, 2026

InsiderFJFitzpatrick JenniferVest 28K shSep 17, 2026

InsiderRLRA CAPITAL MANAGEMENT, L.P.Sell $21.6MSep 17, 2026

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Top Holders

Top Holders (91)History

AllNewIncreasedHeldDecreasedExitedFirst report

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Fund	Action	Shares	Value	Weight	Est. P&L	Conviction
RA CAPITAL MANAGEMENT, L.P.	Unchanged	9.9M	$435.7M	3.8%	-64.62%	0
TGTPG GP A, LLC	Unchanged	6.5M	$285.7M	5.7%	-64.74%	0
VIKING GLOBAL INVESTORS LP	Unchanged	3.2M	$140.6M	0.4%	-65.59%	0
AGADAGE CAPITAL PARTNERS GP, L.L.C.	Increased	1.6M(+966.7%)	$70.4M	0.1%	-90.50%	48
BlackRock, Inc.	Increased	1.5M(+13.8%)	$64.9M	0.0%	-85.60%	34
JPMORGAN CHASE & CO	Increased	1.5M(+1.7%)	$64.1M	0.0%	-74.12%	30
JENNISON ASSOCIATES LLC	Decreased	1.2M(-19.2%)	$51.6M	0.0%	-81.60%	0
CITADEL ADVISORS LLC	Decreased	1.1M(-1.6%)	$50.5M	0.0%	-89.77%	0
VAVANGUARD CAPITAL MANAGEMENT LLC	Increased	1.1M(+10.0%)	$49.8M	0.0%	-88.31%	32
STATE STREET CORP	Increased	1M(+35.1%)	$44.9M	0.0%	-88.97%	38
PRICE T ROWE ASSOCIATES INC /MD/	Decreased	478,016(-36.8%)	$21M	0.0%	-77.90%	0
GEODE CAPITAL MANAGEMENT, LLC	Increased	457,145(+17.3%)	$20.1M	0.0%	-82.57%	33
BAKER BROS. ADVISORS LP	Unchanged	400,000	$17.6M	0.1%	-64.62%	0
GOLDMAN SACHS GROUP INC	Increased	388,810(+47.7%)	$17.1M	0.0%	-88.96%	39
DRIEHAUS CAPITAL MANAGEMENT LLC	Increased	385,447(+403.0%)	$17M	0.1%	-89.11%	46
FRANKLIN TEMPLETON INC	Increased	290,113(+65.3%)	$12.8M	0.0%	-83.22%	41
Aberdeen Group plc	Decreased	284,138(-49.6%)	$12.5M	0.0%	-67.23%	0
FMR LLC	Increased	278,292(+241.9%)	$12.2M	0.0%	-90.05%	45
MILLENNIUM MANAGEMENT LLC	Increased	276,733(+96.8%)	$12.2M	0.0%	-89.03%	45
Candriam S.C.A.	Decreased	233,208(-1.5%)	$10.2M	0.0%	-88.00%	0

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High Conviction Moves-Smart Money Convergence-Fund Consensus-Double-Down Detection

Data sourced from four public-disclosure sources: SEC 13F, Form 4, 13D/13G, and House/Senate STOCK Act disclosures. Not financial advice. Full disclaimer