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YMAB

Y-mAbs Therapeutics
YMAB

Delisted

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

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114 hedge funds and large institutions have $1.11B invested in Y-mAbs Therapeutics in 2020 Q4 according to their latest regulatory filings, with 16 funds opening new positions, 47 increasing their positions, 34 reducing their positions, and 7 closing their positions.

New
Increased
Maintained
Reduced
Closed

129% more first-time investments, than exits

New positions opened: 16 | Existing positions closed: 7

100% more funds holding in top 10

Funds holding in top 10: 2 → 4 (+2)

38% more repeat investments, than reductions

Existing positions increased: 47 | Existing positions reduced: 34

36% more capital invested

Capital invested by funds: $819M → $1.11B (+$292M)

8% more funds holding

Funds holding: 106 → 114 (+8)

1.9% more ownership

Funds ownership: 53.57% → 55.47% (+1.9%)

Holders
114
Holders Change
+8
Holders Change %
+7.55%
% of All Funds
2.02%
Holding in Top 10
4
Holding in Top 10 Change
+2
Holding in Top 10 Change %
+100%
% of All Funds
0.07%
New
16
Increased
47
Reduced
34
Closed
7
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
Artisan Partners
Artisan Partners
Wisconsin
+$14.9M
2
CAM
Cormorant Asset Management
Massachusetts
+$12.2M
3
Vanguard Group
Vanguard Group
Pennsylvania
+$11M
4
ACM
Ashford Capital Management
Delaware
+$10.1M
5
Goldman Sachs
Goldman Sachs
New York
+$6.26M

Top Sellers

Rank Fund Capital Flow
1
SFM
Sphera Funds Management
Israel
-$12.3M
2
Wellington Management Group
Wellington Management Group
Massachusetts
-$9.96M
3
Fidelity Investments
Fidelity Investments
Massachusetts
-$4.97M
4
State Street
State Street
Massachusetts
-$4.95M
5
Axa
Axa
France
-$4.38M
Name Holding Trade Value Shares
Change 		Change in
Stake
N
26
Nuveen
North Carolina
$6.26M +$328K +7,101 +6%
OIM
27
Oracle Investment Management
Connecticut
$6.25M +$4.68M +101,130 +401%
Citadel Advisors
28
Citadel Advisors
Florida
$5.72M +$4.92M +106,301 +1,159%
PI
29
Putnam Investments
Massachusetts
$5.7M +$128K +2,769 +2%
BCM
30
Burrage Capital Management
Massachusetts
$5.69M -$373K -8,063 -7%
Two Sigma Advisers
31
Two Sigma Advisers
New York
$5.61M +$569K +12,300 +12%
Bank of New York Mellon
32
Bank of New York Mellon
New York
$5.33M +$123K +2,650 +3%
Millennium Management
33
Millennium Management
New York
$5.2M +$402K +8,689 +9%
RHJA
34
Rice Hall James & Associates
California
$5M +$297K +6,427 +7%
Axa
35
Axa
France
$4.68M -$4.38M -94,582 -50%
Two Sigma Investments
36
Two Sigma Investments
New York
$3.92M -$613K -13,257 -14%
TCM
37
Tekla Capital Management
Massachusetts
$3.79M – – –
BNP Paribas Financial Markets
38
BNP Paribas Financial Markets
France
$3.36M +$2.81M +60,856 +863%
California Public Employees Retirement System
39
California Public Employees Retirement System
California
$3.35M -$60.1K -1,300 -2%
Bank of America
40
Bank of America
North Carolina
$3.01M -$527K -11,403 -16%
SG Americas Securities
41
SG Americas Securities
New York
$2.81M -$961K -20,774 -27%
D.E. Shaw & Co
42
D.E. Shaw & Co
New York
$2.73M +$2M +43,303 +369%
State of Wisconsin Investment Board
43
State of Wisconsin Investment Board
Wisconsin
$2.42M -$356K -7,700 -14%
California State Teachers Retirement System (CalSTRS)
44
California State Teachers Retirement System (CalSTRS)
California
$2.29M +$22.7K +490 +1%
Swiss National Bank
45
Swiss National Bank
Switzerland
$2.23M – – –
BC
46
Brookfield Corp
Ontario, Canada
$2.18M +$2.04M +44,000 New
RhumbLine Advisers
47
RhumbLine Advisers
Massachusetts
$1.91M +$89.8K +1,941 +5%
Allianz Asset Management
48
Allianz Asset Management
Germany
$1.85M -$876K -18,942 -34%
Aviva
49
Aviva
United Kingdom
$1.63M -$1.24M -26,714 -45%
VIA
50
Vident Investment Advisory
Georgia
$1.56M +$46.4K +1,004 +3%
1
2
3 4 5

YMAB Hedge Fund Activity: Q4 2020 in Review

114 of the 5,652 institutional investors tracked by Wall St. Rank reported a position in Y-mAbs Therapeutics (YMAB) for Q4 2020, worth a combined $1.11B — up 36% from $819M a quarter earlier.

Buyers outnumbered sellers: 16 funds opened new YMAB positions and 7 closed out — a net gain of 9 holders — while 47 added to existing stakes and 34 trimmed.

The largest buyer was Artisan Partners, adding an estimated $14.9M. The largest seller was Sphera Funds Management, cutting an estimated $12.3M.

  • 114 institutional investors held Y-mAbs Therapeutics (YMAB) as of Q4 2020, up from 106 in Q3 2020.
  • Funds reported $1.11B of Y-mAbs Therapeutics stock for Q4 2020, up 36% quarter-over-quarter.
  • 16 funds opened new Y-mAbs Therapeutics positions in Q4 2020 and 7 closed out, a net change of +9 holders.
  • The largest Y-mAbs Therapeutics buyer in Q4 2020 was Artisan Partners, an estimated $14.9M added.
  • The largest Y-mAbs Therapeutics seller in Q4 2020 was Sphera Funds Management, an estimated $12.3M sold.

Based on aggregated 13F filings for Q4 2020.