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Y-mAbs Therapeutics
YMAB

Overview Fund Activity

96 hedge funds and large institutions have $126M invested in Y-mAbs Therapeutics in 2025 Q2 according to their latest regulatory filings, with 13 funds opening new positions, 28 increasing their positions, 36 reducing their positions, and 19 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
96
Holders Change
-6
Holders Change %
-5.88%
% of All Funds
1.29%
Holding in Top 10
1
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.01%
New
13
Increased
28
Reduced
36
Closed
19
Calls
$151K
Puts
$2K
Net Calls
+$149K
Net Calls Change
-$13K

Top Buyers

1
NCM
1
Nantahala Capital Management
Connecticut
$1.59M
2
ACA
2
Acorn Capital Advisors
New York
$15.4M
3
GCP
3
GSA Capital Partners
United Kingdom
$839K
4
SCM
4
Stonepine Capital Management
Oregon
$1.29M
5
UBS Group
5
UBS Group
Switzerland
$1.03M

Top Sellers

1
Pictet Asset Management
1
Pictet Asset Management
Switzerland
$0
2
Millennium Management
2
Millennium Management
New York
$631K
3
Morgan Stanley
3
Morgan Stanley
New York
$1.32M
4
Wellington Management Group
4
Wellington Management Group
Massachusetts
$0
5
BlackRock
5
BlackRock
New York
$12.4M
Name Holding Trade Value Shares
Change 		Shares
Change %
PBA
1
Paradigm Biocapital Advisors
New York
$19.1M – – –
ACA
2
Acorn Capital Advisors
New York
$15.4M +$828K +183,608 +6%
BlackRock
3
BlackRock
New York
$12.4M -$694K -153,948 -5%
CP
4
Caligan Partners
New York
$10.6M – – –
SI
5
Sofinnova Investments
California
$9.9M – – –
Vanguard Group
6
Vanguard Group
Pennsylvania
$8.76M -$14.5K -3,224 -0.2%
PCH
7
Polar Capital Holdings
United Kingdom
$8.07M -$186K -41,200 -2%
Geode Capital Management
8
Geode Capital Management
Massachusetts
$3.83M -$4.69K -1,039 -0.1%
State Street
9
State Street
Massachusetts
$3.52M -$40K -8,876 -1%
BFM
10
Boothbay Fund Management
New York
$3.13M – – –
D.E. Shaw & Co
11
D.E. Shaw & Co
New York
$2.33M -$148K -32,809 -6%
Dimensional Fund Advisors
12
Dimensional Fund Advisors
Texas
$1.86M -$28.5K -6,308 -2%
NCM
13
Nantahala Capital Management
Connecticut
$1.59M +$1.59M +351,878 New
SCM
14
Soleus Capital Management
Connecticut
$1.58M – – –
Northern Trust
15
Northern Trust
Illinois
$1.39M -$89.2K -19,771 -6%
Morgan Stanley
16
Morgan Stanley
New York
$1.32M -$936K -207,594 -42%
SCM
17
Stonepine Capital Management
Oregon
$1.29M +$695K +154,140 +118%
Charles Schwab
18
Charles Schwab
California
$1.25M +$2.57K +569 +0.2%
Bank of America
19
Bank of America
North Carolina
$1.24M -$36.8K -8,154 -3%
AQR Capital Management
20
AQR Capital Management
Connecticut
$1.14M +$394K +87,354 +53%
UBS Group
21
UBS Group
Switzerland
$1.03M +$620K +137,496 +150%
Goldman Sachs
22
Goldman Sachs
New York
$960K +$49.5K +10,975 +5%
Citadel Advisors
23
Citadel Advisors
Florida
$936K +$242K +53,687 +35%
GCP
24
GSA Capital Partners
United Kingdom
$839K +$746K +165,431 +802%
Renaissance Technologies
25
Renaissance Technologies
New York
$740K -$418K -92,606 -36%
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