Jane Street
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Jane Street’s Seres Therapeutics MCRB Stock Holding History

Jane Street’s Portfolio MCRB Stock Details MCRB Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q1 		– Sell
-2,937
Closed -$48.8K – 10142
2024
Q4 		$48.8K Buy
2,937
+1,893
+181% +$30.8K ﹤0.01% 8978
2024
Q3 		$19.7K Sell
1,044
-34,310
-97% -$696K ﹤0.01% 9296
2024
Q2 		$512K Buy
35,354
+31,032
+718% +$518K ﹤0.01% 6988
2024
Q1 		$66.9K Sell
4,322
-10,192
-70% -$220K ﹤0.01% 8679
2023
Q4 		$406K Buy
14,514
+13,044
+887% +$343K ﹤0.01% 7133
2023
Q3 		$70K Sell
1,470
-2,522
-63% -$192K ﹤0.01% 8068
2023
Q2 		$382K Buy
3,992
+2,013
+102% +$219K ﹤0.01% 6731
2023
Q1 		$224K Sell
1,979
-260
-12% -$28.1K ﹤0.01% 7673
2022
Q4 		$251K Buy
+2,239
New +$300K ﹤0.01% 7317
2022
Q2 		– Sell
-958
Closed -$137K – 10400
2022
Q1 		$137K Sell
958
-6,851
-88% -$1.05M ﹤0.01% 9287
2021
Q4 		$1.3M Buy
7,809
+3,741
+92% +$594K ﹤0.01% 5378
2021
Q3 		$567K Sell
4,068
-633
-13% -$124K ﹤0.01% 7044
2021
Q2 		$2.24M Buy
4,701
+950
+25% +$401K ﹤0.01% 4115
2021
Q1 		$1.54M Sell
3,751
-311
-8% -$143K ﹤0.01% 4526
2020
Q4 		$1.99M Buy
4,062
+2,230
+122% +$1.31M ﹤0.01% 3493
2020
Q3 		$1.04M Buy
1,832
+1,116
+156% +$371K ﹤0.01% 4042
2020
Q2 		$68K Buy
716
+130
+22% +$11.4K ﹤0.01% 6805
2020
Q1 		$42K Sell
586
-2,285
-80% -$153K ﹤0.01% 5108
2019
Q4 		$198K Sell
2,871
-1,746
-38% -$129K ﹤0.01% 4727
2019
Q3 		$370K Sell
4,617
-1,116
-19% -$73.7K ﹤0.01% 3915
2019
Q2 		$369K Buy
+5,733
New +$544K ﹤0.01% 3956

Other funds holding MCRB

FP
Flagship Pioneering Cambridge, Massachusetts $1.54B AUM 86.39% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Marshall Wace
Marshall Wace London, United Kingdom $127B AUM 46.06% 1-Year Est. Return
Vontobel Holding
Vontobel Holding Zurich, Switzerland $31.4B AUM 31.97% 1-Year Est. Return
Susquehanna International Group
Susquehanna International Group Bala Cynwyd, Pennsylvania $1.28T AUM 58.89% 1-Year Est. Return
BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
Vanguard Fiduciary Trust
Vanguard Fiduciary Trust Malvern, Pennsylvania $454B AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Jane Street's MCRB Position: Q1 2025 in Review

Jane Street sold out of Seres Therapeutics (MCRB) in Q1 2025, closing a stake of 2,937 shares — an estimated $48.8K sold.

Jane Street first reported a position in MCRB in Q2 2019 and held it in 21 quarters. The position peaked at $2.24M in Q2 2021. 63 funds tracked by Wall St. Rank hold MCRB as of Q1 2025.

  • Jane Street reported no remaining Seres Therapeutics position as of Q1 2025 after selling out during the quarter.
  • Jane Street sold 2,937 Seres Therapeutics shares in Q1 2025, an estimated $48.8K.
  • Jane Street first reported a position in Seres Therapeutics in Q2 2019 and held it in 21 quarters.
  • Jane Street's Seres Therapeutics position peaked at $2.24M in Q2 2021.
  • 63 funds tracked by Wall St. Rank held Seres Therapeutics as of Q1 2025.

Based on Jane Street's 13F filing for Q1 2025, filed 14 May 2025.