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
2026
Q1 		– Sell
-29,905
Closed -$445K – 12419
2025
Q4 		$445K Sell
29,905
-38,195
-56% -$666K ﹤0.01% 7958
2025
Q3 		$1.31M Buy
+68,100
New +$1.09M ﹤0.01% 5754
2023
Q4 		– Sell
-49,365
Closed -$2.35M – 9555
2023
Q3 		$2.35M Buy
49,365
+2,135
+5% +$163K ﹤0.01% 3786
2023
Q2 		$4.52M Buy
+47,230
New +$5.14M ﹤0.01% 2897
2023
Q1 		– Sell
-3,585
Closed -$402K – 9557
2022
Q4 		$402K Buy
3,585
+2,360
+193% +$316K ﹤0.01% 6521
2022
Q3 		$157K Buy
+1,225
New +$125K ﹤0.01% 8367
2022
Q2 		– Sell
-705
Closed -$100K – 10399
2022
Q1 		$100K Sell
705
-3,255
-82% -$501K ﹤0.01% 9457
2021
Q4 		$660K Buy
3,960
+1,465
+59% +$233K ﹤0.01% 6749
2021
Q3 		$347K Sell
2,495
-4,780
-66% -$935K ﹤0.01% 7912
2021
Q2 		$3.47M Buy
7,275
+470
+7% +$198K ﹤0.01% 3295
2021
Q1 		$2.8M Buy
6,805
+2,960
+77% +$1.36M ﹤0.01% 3386
2020
Q4 		$1.88M Buy
3,845
+815
+27% +$477K ﹤0.01% 3591
2020
Q3 		$1.72M Buy
+3,030
New +$1.01M ﹤0.01% 3277

Other funds holding MCRB

FP
Flagship Pioneering Cambridge, Massachusetts $1.16B AUM 67.93% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Marshall Wace
Marshall Wace London, United Kingdom $100B AUM 35.1% 1-Year Est. Return
Vontobel Holding
Vontobel Holding Zurich, Switzerland $29.1B AUM 22.79% 1-Year Est. Return
Susquehanna International Group
Susquehanna International Group Bala Cynwyd, Pennsylvania $893B AUM 36.07% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $194B AUM 35% 1-Year Est. Return
VFT
Vanguard Fiduciary Trust Malvern, Pennsylvania $396B AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 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.