SION

Sionna Therapeutics
SION

47 hedge funds and large institutions have $434M invested in Sionna Therapeutics in 2025 Q1 according to their latest regulatory filings, with 47 funds opening new positions, increasing their positions, reducing their positions, and closing their positions.

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New
Increased
Maintained
Reduced
Closed

more ownership

Funds ownership: →

Holders
47
Holders Change
Holders Change %
% of All Funds
Holding in Top 10
2
Holding in Top 10 Change
Holding in Top 10 Change %
% of All Funds
New
Increased
Reduced
Closed
Calls
–
Puts
–
Net Calls
Net Calls Change

Top Buyers

1
+$109M
2
+$69.9M
3
+$38.8M
4
AVLSA
Atlas Venture Life Science Advisors
Massachusetts
+$38.6M
5
Viking Global Investors
Viking Global Investors
Connecticut
+$30.9M

Top Sellers

No sellers this quarter
Name Holding Trade Value Shares
Change 		Change in
Stake
26
$1.2M
27
$1.19M
28
$1.04M
29
$837K
30
$676K
31
$667K
32
$659K
33
$628K
34
$579K
35
$523K
36
$355K
37
$351K
38
$281K
39
$203K
40
$151K
41
$137K
42
$127K
43
$123K
44
$117K
45
$91.4K
46
$41.2K
47
$6K
1
2