SION

Sionna Therapeutics, Inc. Common Stock
SION

Overview Fund Activity

64 hedge funds and large institutions have $754M invested in Sionna Therapeutics, Inc. Common Stock in 2025 Q2 according to their latest regulatory filings, with 25 funds opening new positions, 18 increasing their positions, 10 reducing their positions, and 8 closing their positions.

Holders
64
Holders Change
+17
Holders Change %
+36.17%
% of All Funds
0.86%
Holding in Top 10
4
Holding in Top 10 Change
+2
Holding in Top 10 Change %
+100%
% of All Funds
0.05%
New
25
Increased
18
Reduced
10
Closed
8
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

1
B
1
Braidwell
Connecticut
$18.8M
2
BlackRock
2
BlackRock
New York
$11.1M
3
Viking Global Investors
3
Viking Global Investors
Connecticut
$55.4M
4
DM
4
Deerfield Management
New York
$16.8M
5
Aberdeen Group
5
Aberdeen Group
United Kingdom
$16.5M

Top Sellers

1
DCM
1
Driehaus Capital Management
Illinois
$1.45M
2
Citadel Advisors
2
Citadel Advisors
Florida
$2.25M
3
Millennium Management
3
Millennium Management
New York
$243K
4
ZP
4
Zimmer Partners
New York
$0
5
T. Rowe Price Associates
5
T. Rowe Price Associates
Maryland
$14.9M
Name Market Value Shares Shares
Change 		Shares
Change %
Wells Fargo
51
Wells Fargo
California
$111K 6,374 +6,374 New
Bank of America
52
Bank of America
North Carolina
$104K 6,012 -2,727 -31%
VIA
53
Virtus Investment Advisers
Connecticut
$96K 5,535 +5,535 New
Citigroup
54
Citigroup
New York
$76K 4,380 +4,380 New
PFSRSONJ
55
Police & Firemen's Retirement System of New Jersey
New Jersey
$45.2K 2,608 +2,608 New
SO
56
STRS Ohio
Ohio
$39.9K 2,300 +2,300 New
BNP Paribas Financial Markets
57
BNP Paribas Financial Markets
France
$30.6K 1,761 +1,761 New
Legal & General Group
58
Legal & General Group
United Kingdom
$23.8K 1,374 +1,374 New
AIP
59
Ameritas Investment Partners
Nebraska
$21.8K 1,259 +1,259 New
California State Teachers Retirement System (CalSTRS)
60
California State Teachers Retirement System (CalSTRS)
California
$13.4K 770 +770 New
AB
61
Amalgamated Bank
New York
$7K 421 +421 New
Royal Bank of Canada
62
Royal Bank of Canada
Ontario, Canada
$1K 60 -558 -90%
HFS
63
Hughes Financial Services
Virginia
$747 44 +44 New
SCM
64
Sterling Capital Management
North Carolina
$521 30 +30 New
ZP
65
Zimmer Partners
New York
– – -237,500 Closed
CP
66
CenterBook Partners
Connecticut
– – -114,284 Closed
SC
67
Stempoint Capital
New York
– – -60,000 Closed
Squarepoint
68
Squarepoint
New York
– – -33,964 Closed
ACM
69
Aster Capital Management
United Arab Emirates
– – -14,757 Closed
Balyasny Asset Management
70
Balyasny Asset Management
Illinois
– – -13,060 Closed
Marshall Wace
71
Marshall Wace
United Kingdom
– – -12,188 Closed
Two Sigma Investments
72
Two Sigma Investments
New York
– – -11,715 Closed
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