SION

Sionna Therapeutics, Inc. Common Stock
SION

Overview Fund Activity

65 hedge funds and large institutions have $754M invested in Sionna Therapeutics, Inc. Common Stock in 2025 Q2 according to their latest regulatory filings, with 26 funds opening new positions, 18 increasing their positions, 10 reducing their positions, and 8 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
65
Holders Change
+18
Holders Change %
+38.3%
% of All Funds
0.87%
Holding in Top 10
4
Holding in Top 10 Change
+2
Holding in Top 10 Change %
+100%
% of All Funds
0.05%
New
26
Increased
18
Reduced
10
Closed
8
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

1
B
Braidwell
Connecticut
+$18.8M
2
BlackRock
BlackRock
New York
+$7.61M
3
Viking Global Investors
Viking Global Investors
Connecticut
+$4.21M
4
DM
Deerfield Management
New York
+$3.88M
5
Aberdeen Group
Aberdeen Group
United Kingdom
+$3.55M

Top Sellers

1
DCM
Driehaus Capital Management
Illinois
-$4.25M
2
Citadel Advisors
Citadel Advisors
Florida
-$3.41M
3
Millennium Management
Millennium Management
New York
-$2.86M
4
ZP
Zimmer Partners
New York
-$2.48M
5
T. Rowe Price Associates
T. Rowe Price Associates
Maryland
-$2.34M
Name Holding Trade Value Shares
Change 		Shares
Change %
Mirae Asset Global ETFs Holdings
51
Mirae Asset Global ETFs Holdings
Hong Kong
$117K +$117K +6,747 New
Wells Fargo
52
Wells Fargo
California
$111K +$111K +6,374 New
Bank of America
53
Bank of America
North Carolina
$104K -$47.3K -2,727 -31%
VIA
54
Virtus Investment Advisers
Connecticut
$96K +$96K +5,535 New
Citigroup
55
Citigroup
New York
$76K +$76K +4,380 New
PFSRSONJ
56
Police & Firemen's Retirement System of New Jersey
New Jersey
$45.2K +$45.2K +2,608 New
SO
57
STRS Ohio
Ohio
$39.9K +$39.9K +2,300 New
BNP Paribas Financial Markets
58
BNP Paribas Financial Markets
France
$30.6K +$30.6K +1,761 New
Legal & General Group
59
Legal & General Group
United Kingdom
$23.8K +$23.8K +1,374 New
AIP
60
Ameritas Investment Partners
Nebraska
$21.8K +$21.8K +1,259 New
California State Teachers Retirement System (CalSTRS)
61
California State Teachers Retirement System (CalSTRS)
California
$13.4K +$13.4K +770 New
AB
62
Amalgamated Bank
New York
$7K +$7K +421 New
Royal Bank of Canada
63
Royal Bank of Canada
Ontario, Canada
$1K -$9.3K -558 -90%
HFS
64
Hughes Financial Services
Virginia
$747 +$747 +44 New
SCM
65
Sterling Capital Management
North Carolina
$521 +$521 +30 New
ZP
66
Zimmer Partners
New York
– -$2.48M -237,500 Closed
CP
67
CenterBook Partners
Connecticut
– -$1.2M -114,284 Closed
SC
68
Stempoint Capital
New York
– -$628K -60,000 Closed
Squarepoint
69
Squarepoint
New York
– -$355K -33,964 Closed
ACM
70
Aster Capital Management
United Arab Emirates
– -$203K -14,757 Closed
Balyasny Asset Management
71
Balyasny Asset Management
Illinois
– -$137K -13,060 Closed
Marshall Wace
72
Marshall Wace
United Kingdom
– -$127K -12,188 Closed
Two Sigma Investments
73
Two Sigma Investments
New York
– -$123K -11,715 Closed
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