Wellington Management Group
YMAB

Wellington Management Group’s Y-mAbs Therapeutics YMAB Stock Holding History

Wellington Management Group’s Portfolio YMAB Stock Details YMAB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q2 		– Sell
-204,052
Closed -$904K – 2071
2025
Q1 		$904K Buy
204,052
+70,789
+53% +$411K ﹤0.01% 1724
2024
Q4 		$1.04M Sell
133,263
-3,451
-3% -$42K ﹤0.01% 1707
2024
Q3 		$1.8M Sell
136,714
-23,730
-15% -$301K ﹤0.01% 1566
2024
Q2 		$1.94M Buy
160,444
+14,141
+10% +$191K ﹤0.01% 1520
2024
Q1 		$2.38M Buy
+146,303
New +$1.97M ﹤0.01% 1485
2022
Q4 		– Sell
-1,948,469
Closed -$28.1M – 2134
2022
Q3 		$28.1M Buy
1,948,469
+78,090
+4% +$1.29M 0.01% 817
2022
Q2 		$28.3M Sell
1,870,379
-40,199
-2% -$469K 0.01% 849
2022
Q1 		$22.7M Sell
1,910,578
-2,360,804
-55% -$24.2M ﹤0.01% 985
2021
Q4 		$69.2M Sell
4,271,382
-6,715
-0.2% -$144K 0.01% 734
2021
Q3 		$122M Sell
4,278,097
-170,513
-4% -$5.37M 0.02% 569
2021
Q2 		$150M Buy
4,448,610
+1,428,152
+47% +$45.8M 0.03% 519
2021
Q1 		$91.3M Buy
3,020,458
+580,649
+24% +$23.8M 0.02% 637
2020
Q4 		$121M Sell
2,439,809
-215,243
-8% -$9.96M 0.02% 541
2020
Q3 		$102M Buy
2,655,052
+327,126
+14% +$13M 0.02% 513
2020
Q2 		$101M Sell
2,327,926
-416,379
-15% -$15.7M 0.02% 523
2020
Q1 		$71.6M Buy
2,744,305
+287,679
+12% +$8.35M 0.02% 535
2019
Q4 		$76.8M Buy
2,456,626
+2,046,011
+498% +$60.5M 0.02% 641
2019
Q3 		$10.7M Buy
+410,615
New +$10.5M ﹤0.01% 1144

Other funds holding YMAB

PBA
Paradigm Biocapital Advisors New York $4.89B AUM 251.12% 1-Year Est. Return
ACA
Acorn Capital Advisors New York $352M AUM 299.18% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
CP
Caligan Partners New York $1.5B AUM 518.95% 1-Year Est. Return
SI
Sofinnova Investments Menlo Park, California $2.63B AUM 117.41% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
PCH
Polar Capital Holdings London, United Kingdom $28.2B AUM 115.26% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
BFM
Boothbay Fund Management New York $7.71B AUM 106.31% 1-Year Est. Return

Wellington Management Group's YMAB Position: Q2 2025 in Review

Wellington Management Group sold out of Y-mAbs Therapeutics (YMAB) in Q2 2025, closing a stake of 204,052 shares — an estimated $904K sold.

Wellington Management Group first reported a position in YMAB in Q3 2019 and held it in 18 quarters. The position peaked at $150M in Q2 2021. 97 funds tracked by Wall St. Rank hold YMAB as of Q2 2025.

  • Wellington Management Group reported no remaining Y-mAbs Therapeutics position as of Q2 2025 after selling out during the quarter.
  • Wellington Management Group sold 204,052 Y-mAbs Therapeutics shares in Q2 2025, an estimated $904K.
  • Wellington Management Group first reported a position in Y-mAbs Therapeutics in Q3 2019 and held it in 18 quarters.
  • Wellington Management Group's Y-mAbs Therapeutics position peaked at $150M in Q2 2021.
  • 97 funds tracked by Wall St. Rank held Y-mAbs Therapeutics as of Q2 2025.

Based on Wellington Management Group's 13F filing for Q2 2025, filed 14 Aug 2025.