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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 %
JPMorgan Chase & Co
26
JPMorgan Chase & Co
New York
$740K -$376K -83,387 -34%
IAM
27
Infinitum Asset Management
Florida
$701K – – –
Jacobs Levy Equity Management
28
Jacobs Levy Equity Management
New Jersey
$643K -$428K -94,870 -40%
Millennium Management
29
Millennium Management
New York
$631K -$1.47M -326,665 -70%
Two Sigma Investments
30
Two Sigma Investments
New York
$565K -$133K -29,487 -19%
Federated Hermes
31
Federated Hermes
Pennsylvania
$539K -$153K -34,028 -22%
Two Sigma Advisers
32
Two Sigma Advisers
New York
$522K -$124K -27,600 -19%
RHJA
33
Rice Hall James & Associates
California
$494K +$26.9K +5,962 +6%
Bank of New York Mellon
34
Bank of New York Mellon
New York
$448K +$31K +6,878 +7%
BNP Paribas Financial Markets
35
BNP Paribas Financial Markets
France
$426K -$5.05K -1,119 -1%
NL
36
Nuveen LLC
North Carolina
$421K -$86K -19,065 -17%
XT
37
XTX Topco
Cayman Islands
$390K -$22.6K -5,014 -5%
Barclays
38
Barclays
United Kingdom
$329K +$118K +26,084 +56%
CSS
39
Cubist Systematic Strategies
Connecticut
$315K -$386K -85,614 -55%
RhumbLine Advisers
40
RhumbLine Advisers
Massachusetts
$308K +$65.3K +14,490 +27%
SO
41
STRS Ohio
Ohio
$281K +$85.7K +19,000 +44%
JF
42
Jump Financial
Illinois
$277K +$106K +23,421 +62%
Jane Street
43
Jane Street
New York
$275K +$275K +60,873 New
AllianceBernstein
44
AllianceBernstein
Tennessee
$268K +$20.7K +4,600 +8%
BCM
45
Bridgeway Capital Management
Texas
$251K +$139K +30,800 +124%
State of Wisconsin Investment Board
46
State of Wisconsin Investment Board
Wisconsin
$232K +$232K +51,336 New
Susquehanna International Group
47
Susquehanna International Group
Pennsylvania
$230K -$43.2K -9,570 -16%
SC
48
Sapient Capital
Indiana
$197K – – –
Invesco
49
Invesco
Georgia
$193K +$46.4K +10,286 +32%
Marshall Wace
50
Marshall Wace
United Kingdom
$181K +$181K +40,181 New
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2
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