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 %
State Street
26
State Street
Massachusetts
$2.16M +$1.91M +110,118 +765%
RSCM
27
Rock Springs Capital Management
Maryland
$1.73M – – –
Charles Schwab
28
Charles Schwab
California
$1.61M +$489K +28,188 +44%
Northern Trust
29
Northern Trust
Illinois
$1.59M +$1.13M +65,068 +243%
DCM
30
Driehaus Capital Management
Illinois
$1.45M -$4.25M -245,039 -75%
WP
31
Woodline Partners
California
$1.39M – – –
UBS Group
32
UBS Group
Switzerland
$891K +$698K +40,221 +361%
Holocene Advisors
33
Holocene Advisors
New York
$868K – – –
TD Asset Management
34
TD Asset Management
Ontario, Canada
$867K -$93.7K -5,400 -10%
Goldman Sachs
35
Goldman Sachs
New York
$799K -$307K -17,693 -28%
Morgan Stanley
36
Morgan Stanley
New York
$764K +$695K +40,079 +1,017%
Manulife (Manufacturers Life Insurance)
37
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$660K +$77.9K +4,489 +13%
Renaissance Technologies
38
Renaissance Technologies
New York
$451K +$451K +26,000 New
Bank of New York Mellon
39
Bank of New York Mellon
New York
$419K +$419K +24,131 New
Barclays
40
Barclays
United Kingdom
$400K +$400K +23,022 New
RhumbLine Advisers
41
RhumbLine Advisers
Massachusetts
$307K +$307K +17,670 New
Polen Capital Management
42
Polen Capital Management
Florida
$295K +$295K +16,975 New
BAM
43
Bosun Asset Management
Illinois
$295K +$295K +16,975 New
NL
44
Nuveen LLC
North Carolina
$278K +$278K +16,040 New
Susquehanna International Group
45
Susquehanna International Group
Pennsylvania
$257K +$257K +14,834 New
Millennium Management
46
Millennium Management
New York
$243K -$2.86M -165,038 -92%
Commonwealth Equity Services
47
Commonwealth Equity Services
Massachusetts
$243K +$243K +14,017 New
Deutsche Bank
48
Deutsche Bank
Germany
$166K +$166K +9,596 New
MIM
49
MetLife Investment Management
New Jersey
$139K +$139K +8,033 New
New York State Common Retirement Fund
50
New York State Common Retirement Fund
New York
$118K +$118K +6,800 New
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2
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