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 %
State Street
26
State Street
Massachusetts
$2.16M 124,518 +110,118 +765%
RSCM
27
Rock Springs Capital Management
Maryland
$1.73M 99,429 – –
Charles Schwab
28
Charles Schwab
California
$1.61M 92,832 +28,188 +44%
Northern Trust
29
Northern Trust
Illinois
$1.59M 91,890 +65,068 +243%
DCM
30
Driehaus Capital Management
Illinois
$1.45M 83,850 -245,039 -75%
WP
31
Woodline Partners
California
$1.39M 80,000 – –
UBS Group
32
UBS Group
Switzerland
$891K 51,367 +40,221 +361%
Holocene Advisors
33
Holocene Advisors
New York
$868K 50,000 – –
TD Asset Management
34
TD Asset Management
Ontario, Canada
$867K 49,966 -5,400 -10%
Goldman Sachs
35
Goldman Sachs
New York
$799K 46,048 -17,693 -28%
Morgan Stanley
36
Morgan Stanley
New York
$764K 44,018 +40,079 +1,017%
Manulife (Manufacturers Life Insurance)
37
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$660K 38,038 +4,489 +13%
Renaissance Technologies
38
Renaissance Technologies
New York
$451K 26,000 +26,000 New
Bank of New York Mellon
39
Bank of New York Mellon
New York
$419K 24,131 +24,131 New
Barclays
40
Barclays
United Kingdom
$400K 23,022 +23,022 New
RhumbLine Advisers
41
RhumbLine Advisers
Massachusetts
$307K 17,670 +17,670 New
BAM
42
Bosun Asset Management
Illinois
$295K 16,975 +16,975 New
Polen Capital Management
43
Polen Capital Management
Florida
$295K 16,975 +16,975 New
NL
44
Nuveen LLC
North Carolina
$278K 16,040 +16,040 New
Millennium Management
45
Millennium Management
New York
$243K 14,034 -165,038 -92%
Commonwealth Equity Services
46
Commonwealth Equity Services
Massachusetts
$243K 14,017 +14,017 New
Deutsche Bank
47
Deutsche Bank
Germany
$166K 9,596 +9,596 New
MIM
48
MetLife Investment Management
New Jersey
$139K 8,033 +8,033 New
New York State Common Retirement Fund
49
New York State Common Retirement Fund
New York
$118K 6,800 +6,800 New
Mirae Asset Global ETFs Holdings
50
Mirae Asset Global ETFs Holdings
Hong Kong
$117K 6,747 +6,747 New
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