YMAB

Y-mAbs Therapeutics
YMAB

Overview Fund Activity
Delisted

YMAB was delisted on the 15th of September, 2025.

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117 hedge funds and large institutions have $804M invested in Y-mAbs Therapeutics in 2021 Q1 according to their latest regulatory filings, with 18 funds opening new positions, 55 increasing their positions, 32 reducing their positions, and 14 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
117
Holders Change
+3
Holders Change %
+2.63%
% of All Funds
2.06%
Holding in Top 10
2
Holding in Top 10 Change
-2
Holding in Top 10 Change %
-50%
% of All Funds
0.04%
New
18
Increased
55
Reduced
32
Closed
14
Calls
–
Puts
$496K
Net Calls
-$496K
Net Calls Change
-$496K

Top Buyers

1
State Street
State Street
Massachusetts
+$23.2M
2
Wellington Management Group
Wellington Management Group
Massachusetts
+$17.6M
3
Fidelity Investments
Fidelity Investments
Massachusetts
+$16.4M
4
FLAM
First Light Asset Management
Minnesota
+$9.33M
5
ACM
Ashford Capital Management
Delaware
+$8.73M

Top Sellers

1
PCH
Polar Capital Holdings
United Kingdom
-$15.1M
2
CAM
Cormorant Asset Management
Massachusetts
-$13.1M
3
SFM
Sphera Funds Management
Israel
-$6.49M
4
PI
Putnam Investments
Massachusetts
-$5.7M
5
Axa
Axa
France
-$4.68M
Name Holding Trade Value Shares
Change 		Shares
Change %
Morgan Stanley
26
Morgan Stanley
New York
$6.48M +$2.48M +82,151 +62%
TCM
27
Tekla Capital Management
Massachusetts
$5.98M +$3.67M +121,272 +158%
Charles Schwab
28
Charles Schwab
California
$5.76M +$394K +13,042 +7%
LOAMS
29
Lombard Odier Asset Management (Switzerland)
Switzerland
$5.49M +$5.49M +181,492 New
CLOS
30
Compagnie Lombard Odier SCmA
Switzerland
$5.49M +$5.49M +181,492 New
GPP
31
Great Point Partners
Connecticut
$4.54M +$4.54M +150,000 New
Nuveen Asset Management
32
Nuveen Asset Management
Illinois
$3.88M +$59.5K +1,967 +2%
BCM
33
Burrage Capital Management
Massachusetts
$3.46M -$15.4K -508 -0.4%
BC
34
Brookfield Corp
Ontario, Canada
$3.26M +$1.93M +63,700 +145%
RHJA
35
Rice Hall James & Associates
California
$3.06M +$1.03K +34 +0%
Bank of New York Mellon
36
Bank of New York Mellon
New York
$3.05M -$207K -6,849 -6%
Citigroup
37
Citigroup
New York
$2.93M +$2.69M +88,812 +1,091%
Federated Hermes
38
Federated Hermes
Pennsylvania
$2.83M +$2.16M +71,445 +323%
Citadel Advisors
39
Citadel Advisors
Florida
$2.76M -$728K -24,074 -21%
Bank of America
40
Bank of America
North Carolina
$2.5M +$659K +21,801 +36%
D.E. Shaw & Co
41
D.E. Shaw & Co
New York
$2.43M +$769K +25,422 +46%
Rafferty Asset Management
42
Rafferty Asset Management
New York
$2.34M +$2.18M +71,969 +1,330%
MS
43
Maven Securities
Jersey
$1.9M +$1.9M +65,000 New
California Public Employees Retirement System
44
California Public Employees Retirement System
California
$1.68M -$365K -12,058 -18%
Swiss National Bank
45
Swiss National Bank
Switzerland
$1.4M +$36.3K +1,200 +3%
California State Teachers Retirement System (CalSTRS)
46
California State Teachers Retirement System (CalSTRS)
California
$1.39M -$4.2K -139 -0.3%
PCM
47
Pinz Capital Management
New York
$1.25M +$1.25M +41,295 New
State of Wisconsin Investment Board
48
State of Wisconsin Investment Board
Wisconsin
$1.24M -$236K -7,800 -16%
Aviva
49
Aviva
United Kingdom
$1.16M +$163K +5,398 +16%
Allianz Asset Management
50
Allianz Asset Management
Germany
$1.13M -$5.41K -179 -0.5%
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