YMAB icon

Y-mAbs Therapeutics
YMAB

Overview Fund Activity

102 hedge funds and large institutions have $128M invested in Y-mAbs Therapeutics in 2025 Q1 according to their latest regulatory filings, with 17 funds opening new positions, 40 increasing their positions, 28 reducing their positions, and 26 closing their positions.

New
Increased
Maintained
Reduced
Closed
Holders
102
Holders Change
-10
Holders Change %
-8.93%
% of All Funds
1.39%
Holding in Top 10
1
Holding in Top 10 Change
-1
Holding in Top 10 Change %
-50%
% of All Funds
0.01%
New
17
Increased
40
Reduced
28
Closed
26
Calls
$171K
Puts
$9K
Net Calls
+$162K
Net Calls Change
+$120K

Top Buyers

1
CP
Caligan Partners
New York
$10.4M
2
Millennium Management
Millennium Management
New York
$2.07M
3
ACA
Acorn Capital Advisors
New York
$14.3M
4
Morgan Stanley
Morgan Stanley
New York
$2.22M
5
Bank of America
Bank of America
North Carolina
$1.25M

Top Sellers

1
LGM
Logos Global Management
California
$0
2
CAM
Cormorant Asset Management
Massachusetts
$0
3
State Street
State Street
Massachusetts
$3.5M
4
Pictet Asset Management
Pictet Asset Management
Switzerland
$1.96M
5
Franklin Resources
Franklin Resources
California
$0
Name Holding Trade Value Shares
Change 		Shares
Change %
PBA
1
Paradigm Biocapital Advisors
New York
$18.8M – – –
ACA
2
Acorn Capital Advisors
New York
$14.3M +$1.65M +373,562 +13%
BlackRock
3
BlackRock
New York
$12.9M -$427K -96,447 -3%
CP
4
Caligan Partners
New York
$10.4M +$2.55M +574,627 +33%
SI
5
Sofinnova Investments
California
$9.72M – – –
Vanguard Group
6
Vanguard Group
Pennsylvania
$8.62M -$237K -53,513 -3%
PCH
7
Polar Capital Holdings
United Kingdom
$8.11M – – –
Geode Capital Management
8
Geode Capital Management
Massachusetts
$3.76M +$120K +27,191 +3%
State Street
9
State Street
Massachusetts
$3.5M -$2.33M -525,388 -40%
BFM
10
Boothbay Fund Management
New York
$3.07M – – –
D.E. Shaw & Co
11
D.E. Shaw & Co
New York
$2.44M -$290K -65,465 -11%
Morgan Stanley
12
Morgan Stanley
New York
$2.22M +$795K +179,354 +56%
Millennium Management
13
Millennium Management
New York
$2.07M +$1.91M +431,173 +1,216%
Pictet Asset Management
14
Pictet Asset Management
Switzerland
$1.96M -$1.39M -314,363 -42%
Dimensional Fund Advisors
15
Dimensional Fund Advisors
Texas
$1.86M -$198K -44,681 -10%
SCM
16
Soleus Capital Management
Connecticut
$1.55M – – –
Northern Trust
17
Northern Trust
Illinois
$1.45M -$139K -31,322 -9%
Bank of America
18
Bank of America
North Carolina
$1.25M +$687K +155,159 +122%
Charles Schwab
19
Charles Schwab
California
$1.23M -$30.7K -6,930 -2%
Renaissance Technologies
20
Renaissance Technologies
New York
$1.14M +$554K +125,106 +95%
JPMorgan Chase & Co
21
JPMorgan Chase & Co
New York
$1.1M +$664K +149,782 +153%
Jacobs Levy Equity Management
22
Jacobs Levy Equity Management
New Jersey
$1.05M +$389K +87,830 +59%
Wellington Management Group
23
Wellington Management Group
Massachusetts
$904K +$314K +70,789 +53%
Goldman Sachs
24
Goldman Sachs
New York
$894K -$77.1K -17,399 -8%
AQR Capital Management
25
AQR Capital Management
Connecticut
$730K +$655K +147,788 +869%
1
2 3 4 5