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YMAB

Y-mAbs Therapeutics
YMAB

Delisted

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

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85 hedge funds and large institutions have $95.4M invested in Y-mAbs Therapeutics in 2023 Q1 according to their latest regulatory filings, with 13 funds opening new positions, 32 increasing their positions, 27 reducing their positions, and 19 closing their positions.

New
Increased
Maintained
Reduced
Closed

2,400% more call options, than puts

Call options by funds: $50K | Put options by funds: $2K

19% more repeat investments, than reductions

Existing positions increased: 32 | Existing positions reduced: 27

2% more capital invested

Capital invested by funds: $93.6M → $95.4M (+$1.81M)

0% more funds holding in top 10

Funds holding in top 10: 1 → 1 (0)

0.73% less ownership

Funds ownership: 44.21% → 43.48% (-0.73%)

7% less funds holding

Funds holding: 91 → 85 (-6)

32% less first-time investments, than exits

New positions opened: 13 | Existing positions closed: 19

Holders
85
Holders Change
-6
Holders Change %
-6.59%
% of All Funds
1.35%
Holding in Top 10
1
Holding in Top 10 Change
–
Holding in Top 10 Change %
–
% of All Funds
0.02%
New
13
Increased
32
Reduced
27
Closed
19
Calls
$50K
Puts
$2K
Net Calls
+$48K
Net Calls Change
-$44K

Top Buyers

Rank Fund Capital Flow
1
ACM
AIGH Capital Management
Maryland
+$1.75M
2
Jacobs Levy Equity Management
Jacobs Levy Equity Management
New Jersey
+$1.32M
3
D.E. Shaw & Co
D.E. Shaw & Co
New York
+$1.32M
4
N
Nuveen
North Carolina
+$936K
5
Acadian Asset Management
Acadian Asset Management
Massachusetts
+$821K

Top Sellers

Rank Fund Capital Flow
1
Citadel Advisors
Citadel Advisors
Florida
-$2.67M
2
Millennium Management
Millennium Management
New York
-$2.06M
3
AG
Artal Group
Luxembourg
-$1.95M
4
E
Ergoteles
New York
-$936K
5
BlackRock
BlackRock
New York
-$889K
Name Holding Trade Value Shares
Change 		Change in
Stake
AllianceBernstein
26
AllianceBernstein
Tennessee
$780K – – –
Two Sigma Investments
27
Two Sigma Investments
New York
$780K -$220K -53,839 -26%
State of Wisconsin Investment Board
28
State of Wisconsin Investment Board
Wisconsin
$756K +$94.9K +23,242 +18%
SO
29
STRS Ohio
Ohio
$745K +$159K +38,900 +35%
NYLIM
30
New York Life Investment Management
New York
$730K +$595K +145,808 New
Bank of New York Mellon
31
Bank of New York Mellon
New York
$564K -$3.3K -809 -0.7%
Dimensional Fund Advisors
32
Dimensional Fund Advisors
Texas
$548K -$47.8K -11,704 -10%
WVP
33
Worth Venture Partners
New Jersey
$523K +$427K +104,487 New
RHJA
34
Rice Hall James & Associates
California
$448K +$9.76K +2,390 +3%
Renaissance Technologies
35
Renaissance Technologies
New York
$438K +$138K +33,900 +63%
SCM
36
Soleus Capital Management
Connecticut
$437K – – –
Bank of America
37
Bank of America
North Carolina
$428K +$255K +62,332 +270%
UBS Group
38
UBS Group
Switzerland
$382K +$311K +76,263 New
BCM
39
Bridgeway Capital Management
Texas
$376K +$306K +75,000 New
Prudential Financial
40
Prudential Financial
New Jersey
$371K +$208K +50,900 +220%
Federated Hermes
41
Federated Hermes
Pennsylvania
$320K -$260K -63,579 -50%
Man Group
42
Man Group
United Kingdom
$307K -$116K -28,343 Closed
CSS
43
Cubist Systematic Strategies
Connecticut
$286K +$72.9K +17,866 +46%
Susquehanna International Group
44
Susquehanna International Group
Pennsylvania
$245K +$58K +14,199 +41%
RhumbLine Advisers
45
RhumbLine Advisers
Massachusetts
$244K -$470 -115 -0.2%
CIC
46
Cornercap Investment Counsel
Georgia
$242K – – –
Barclays
47
Barclays
United Kingdom
$238K +$153K +37,550 +381%
Citigroup
48
Citigroup
New York
$235K +$187K +45,779 +4,307%
VOYA Investment Management
49
VOYA Investment Management
Georgia
$227K +$31K +7,594 +20%
CANY
50
Caxton Associates (New York)
New York
$216K +$176K +43,046 New
1
2
3 4 5

YMAB Hedge Fund Activity: Q1 2023 in Review

85 of the 6,276 institutional investors tracked by Wall St. Rank reported a position in Y-mAbs Therapeutics (YMAB) for Q1 2023, worth a combined $95.4M — up 1.9% from $93.6M a quarter earlier.

Sellers outnumbered buyers: 19 funds closed out of YMAB and 13 opened new positions — a net loss of 6 holders — while 27 trimmed existing stakes and 32 added.

The largest buyer was AIGH Capital Management, opening a new position worth an estimated $1.75M. The largest seller was Citadel Advisors, cutting an estimated $2.67M.

  • 85 institutional investors held Y-mAbs Therapeutics (YMAB) as of Q1 2023, down from 91 in Q4 2022.
  • Funds reported $95.4M of Y-mAbs Therapeutics stock for Q1 2023, up 1.9% quarter-over-quarter.
  • 13 funds opened new Y-mAbs Therapeutics positions in Q1 2023 and 19 closed out, a net change of -6 holders.
  • The largest Y-mAbs Therapeutics buyer in Q1 2023 was AIGH Capital Management, an estimated $1.75M added.
  • The largest Y-mAbs Therapeutics seller in Q1 2023 was Citadel Advisors, an estimated $2.67M sold.

Based on aggregated 13F filings for Q1 2023.