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YMAB

Y-mAbs Therapeutics
YMAB

Delisted

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

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81 hedge funds and large institutions have $606M invested in Y-mAbs Therapeutics in 2019 Q4 according to their latest regulatory filings, with 28 funds opening new positions, 38 increasing their positions, 9 reducing their positions, and 7 closing their positions.

New
Increased
Maintained
Reduced
Closed

322% more repeat investments, than reductions

Existing positions increased: 38 | Existing positions reduced: 9

300% more first-time investments, than exits

New positions opened: 28 | Existing positions closed: 7

200% more funds holding in top 10

Funds holding in top 10: 1 → 3 (+2)

77% more capital invested

Capital invested by funds: $342M → $606M (+$264M)

25% more funds holding

Funds holding: 65 → 81 (+16)

10.41% more ownership

Funds ownership: 38.43% → 48.84% (+10%)

Holders
81
Holders Change
+16
Holders Change %
+24.62%
% of All Funds
1.6%
Holding in Top 10
3
Holding in Top 10 Change
+2
Holding in Top 10 Change %
+200%
% of All Funds
0.06%
New
28
Increased
38
Reduced
9
Closed
7
Calls
–
Puts
–
Net Calls
–
Net Calls Change
–

Top Buyers

Rank Fund Capital Flow
1
Wellington Management Group
Wellington Management Group
Massachusetts
+$60.5M
2
CAM
Cormorant Asset Management
Massachusetts
+$21.3M
3
BlackRock
BlackRock
New York
+$20.4M
4
Loomis, Sayles & Company
Loomis, Sayles & Company
Massachusetts
+$16.1M
5
State Street
State Street
Massachusetts
+$11.7M

Top Sellers

Rank Fund Capital Flow
1
T. Rowe Price Associates
T. Rowe Price Associates
Maryland
-$21.8M
2
PA
Perceptive Advisors
New York
-$8.66M
3
Fidelity Investments
Fidelity Investments
Massachusetts
-$6.97M
4
Stifel Financial
Stifel Financial
Missouri
-$2.61M
5
AA
ALPS Advisors
Colorado
-$1.78M
Name Holding Trade Value Shares
Change 		Change in
Stake
New York State Common Retirement Fund
51
New York State Common Retirement Fund
New York
$650K – – –
Citigroup
52
Citigroup
New York
$549K +$482K +16,276 +1,257%
Rafferty Asset Management
53
Rafferty Asset Management
New York
$530K +$502K +16,962 New
AIG
54
American International Group
New York
$463K +$57.8K +1,955 +15%
TRSOTSOK
55
Teachers Retirement System of the State of Kentucky
Kentucky
$459K +$435K +14,700 New
LI
56
Leap Investments
Illinois
$418K +$396K +13,383 New
VEA
57
Virtus ETF Advisers
New York
$406K +$385K +13,003 New
Manulife (Manufacturers Life Insurance)
58
Manulife (Manufacturers Life Insurance)
Ontario, Canada
$402K -$17.7K -599 -4%
ProShare Advisors
59
ProShare Advisors
Maryland
$369K +$349K +11,795 New
TCM
60
Tekla Capital Management
Massachusetts
$354K +$335K +11,326 New
VOYA Investment Management
61
VOYA Investment Management
Georgia
$351K +$332K +11,222 New
Wells Fargo
62
Wells Fargo
California
$343K -$464K -15,690 -59%
MIM
63
MetLife Investment Management
New Jersey
$315K – – –
Ensign Peak Advisors
64
Ensign Peak Advisors
Utah
$275K +$260K +8,801 New
UBS AM
65
UBS AM
Illinois
$250K +$237K +8,000 New
Qube Research & Technologies (QRT)
66
Qube Research & Technologies (QRT)
United Kingdom
$237K +$225K +7,588 New
MLICM
67
Metropolitan Life Insurance Company (MetLife)
New York
$228K – – –
ARTA
68
A.R.T. Advisors
New York
$203K +$192K +6,482 New
MAM
69
Meeder Asset Management
Ohio
$196K +$187K +6,305 New
Legal & General Group
70
Legal & General Group
United Kingdom
$175K +$65.3K +2,207 +65%
Victory Capital Management
71
Victory Capital Management
Texas
$165K +$104K +3,506 +196%
SG Americas Securities
72
SG Americas Securities
New York
$106K +$100K +3,382 New
Bank of Montreal
73
Bank of Montreal
Ontario, Canada
$93K +$35.4K +1,196 +67%
BNP Paribas Financial Markets
74
BNP Paribas Financial Markets
France
$85.8K -$1.89K -64 -2%
AIP
75
Ameritas Investment Partners
Nebraska
$63K +$7.6K +257 +15%
1 2
3
4

YMAB Hedge Fund Activity: Q4 2019 in Review

81 of the 5,076 institutional investors tracked by Wall St. Rank reported a position in Y-mAbs Therapeutics (YMAB) for Q4 2019, worth a combined $606M — up 77% from $342M a quarter earlier.

Buyers outnumbered sellers: 28 funds opened new YMAB positions and 7 closed out — a net gain of 21 holders — while 38 added to existing stakes and 9 trimmed.

The largest buyer was Wellington Management Group, adding an estimated $60.5M. The largest seller was T. Rowe Price Associates, exiting entirely with an estimated $21.8M sold.

  • 81 institutional investors held Y-mAbs Therapeutics (YMAB) as of Q4 2019, up from 65 in Q3 2019.
  • Funds reported $606M of Y-mAbs Therapeutics stock for Q4 2019, up 77% quarter-over-quarter.
  • 28 funds opened new Y-mAbs Therapeutics positions in Q4 2019 and 7 closed out, a net change of +21 holders.
  • The largest Y-mAbs Therapeutics buyer in Q4 2019 was Wellington Management Group, an estimated $60.5M added.
  • The largest Y-mAbs Therapeutics seller in Q4 2019 was T. Rowe Price Associates, an estimated $21.8M sold.

Based on aggregated 13F filings for Q4 2019.