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YMAB

Y-mAbs Therapeutics
YMAB

Delisted

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

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109 hedge funds and large institutions have $920M invested in Y-mAbs Therapeutics in 2020 Q2 according to their latest regulatory filings, with 33 funds opening new positions, 40 increasing their positions, 29 reducing their positions, and 4 closing their positions.

New
Increased
Maintained
Reduced
Closed

725% more first-time investments, than exits

New positions opened: 33 | Existing positions closed: 4

76% more capital invested

Capital invested by funds: $523M → $920M (+$397M)

38% more repeat investments, than reductions

Existing positions increased: 40 | Existing positions reduced: 29

36% more funds holding

Funds holding: 80 → 109 (+29)

33% more funds holding in top 10

Funds holding in top 10: 3 → 4 (+1)

3.04% more ownership

Funds ownership: 50.49% → 53.53% (+3%)

Holders
109
Holders Change
+29
Holders Change %
+36.25%
% of All Funds
2.23%
Holding in Top 10
4
Holding in Top 10 Change
+1
Holding in Top 10 Change %
+33.33%
% of All Funds
0.08%
New
33
Increased
40
Reduced
29
Closed
4
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
FLAM
First Light Asset Management
Minnesota
+$23M
2
BlackRock
BlackRock
New York
+$12.5M
3
State Street
State Street
Massachusetts
+$6.32M
4
Vanguard Group
Vanguard Group
Pennsylvania
+$5.98M
5
PC
Polar Capital
United Kingdom
+$4.73M

Top Sellers

Rank Fund Capital Flow
1
Wellington Management Group
Wellington Management Group
Massachusetts
-$15.7M
2
PA
Perceptive Advisors
New York
-$6.32M
3
CAM
Cormorant Asset Management
Massachusetts
-$5.96M
4
DCM
Driehaus Capital Management
Illinois
-$4.18M
5
AG
Artal Group
Luxembourg
-$3.78M
Name Holding Trade Value Shares
Change 		Change in
Stake
New York State Common Retirement Fund
26
New York State Common Retirement Fund
New York
$5.48M +$253K +6,700 +6%
BCM
27
Burrage Capital Management
Massachusetts
$5.32M -$1.84M -48,763 -28%
PI
28
Putnam Investments
Massachusetts
$4.54M +$640K +16,920 +19%
Millennium Management
29
Millennium Management
New York
$4.52M -$1.5M -39,653 -27%
Bank of New York Mellon
30
Bank of New York Mellon
New York
$4.52M +$724K +19,140 +22%
Federated Hermes
31
Federated Hermes
Pennsylvania
$3.84M +$3.36M +88,808 New
Invesco
32
Invesco
Georgia
$3.67M +$3.22M +85,061 New
Morgan Stanley
33
Morgan Stanley
New York
$3.54M +$2.9M +76,700 +1,461%
Two Sigma Advisers
34
Two Sigma Advisers
New York
$3.43M +$563K +14,900 +23%
TCM
35
Tekla Capital Management
Massachusetts
$3.31M – – –
Bank of America
36
Bank of America
North Carolina
$2.99M +$64.8K +1,714 +3%
California Public Employees Retirement System
37
California Public Employees Retirement System
California
$2.9M +$621K +16,431 +32%
RHJA
38
Rice Hall James & Associates
California
$2.78M +$26.4K +698 +1%
Allianz Asset Management
39
Allianz Asset Management
Germany
$2.5M -$149K -3,936 -6%
AA
40
ALPS Advisors
Colorado
$2.34M +$2.05M +54,239 New
Barclays
41
Barclays
United Kingdom
$2.25M +$1.56M +41,223 +382%
Aviva
42
Aviva
United Kingdom
$2.17M -$3.12M -82,407 -62%
State of Wisconsin Investment Board
43
State of Wisconsin Investment Board
Wisconsin
$2.13M +$306K +8,100 +20%
California State Teachers Retirement System (CalSTRS)
44
California State Teachers Retirement System (CalSTRS)
California
$1.95M +$357K +9,435 +26%
MAM
45
Martingale Asset Management
Massachusetts
$1.94M +$1.7M +44,904 New
Swiss National Bank
46
Swiss National Bank
Switzerland
$1.92M +$223K +5,900 +15%
RhumbLine Advisers
47
RhumbLine Advisers
Massachusetts
$1.81M +$523K +13,827 +49%
CS
48
Credit Suisse
Switzerland
$1.6M +$604K +15,982 +75%
VIA
49
Vident Investment Advisory
Georgia
$1.4M -$460K -12,177 -27%
D.E. Shaw & Co
50
D.E. Shaw & Co
New York
$1.37M +$425K +11,236 +55%
1
2
3 4 5

YMAB Hedge Fund Activity: Q2 2020 in Review

109 of the 4,878 institutional investors tracked by Wall St. Rank reported a position in Y-mAbs Therapeutics (YMAB) for Q2 2020, worth a combined $920M — up 76% from $523M a quarter earlier.

Buyers outnumbered sellers: 33 funds opened new YMAB positions and 4 closed out — a net gain of 29 holders — while 40 added to existing stakes and 29 trimmed.

The largest buyer was First Light Asset Management, opening a new position worth an estimated $23M. The largest seller was Wellington Management Group, cutting an estimated $15.7M.

  • 109 institutional investors held Y-mAbs Therapeutics (YMAB) as of Q2 2020, up from 80 in Q1 2020.
  • Funds reported $920M of Y-mAbs Therapeutics stock for Q2 2020, up 76% quarter-over-quarter.
  • 33 funds opened new Y-mAbs Therapeutics positions in Q2 2020 and 4 closed out, a net change of +29 holders.
  • The largest Y-mAbs Therapeutics buyer in Q2 2020 was First Light Asset Management, an estimated $23M added.
  • The largest Y-mAbs Therapeutics seller in Q2 2020 was Wellington Management Group, an estimated $15.7M sold.

Based on aggregated 13F filings for Q2 2020.