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SIMPLEX TRADING, LLC

Position in MCRB — Seres Therapeutics, Inc.

CIK 1488542 CHICAGO, IL

Position in MCRB

as of Jun 30, 2026 · filed Aug 12, 2026
Position Value
$36,278
+$9,048 QoQ
Shares Held
4,598
+49.8% QoQ
Ownership
0.046%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#19
of 36 holders
Holding Since
Sep 2020
19 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in MCRB Over Time

Shares Held

Position Value (USD)

Position in Biotechnology

Healthcare · as of Jun 30, 2026

SIMPLEX TRADING, LLC holds $82,521,702 across 182 Biotechnology names. MCRB ranks #112 (0.0% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in MCRB

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19 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $36,278 4,598
2026-03-31 $27,230 3,070
2025-12-31 $18,332 1,232
2025-09-30 $54,006 2,807
2024-12-31 $20,572 24,756
2024-09-30 $2 2,624
2024-06-30 $56,434 77,948
2024-03-31 $57,176 73,871
2023-12-31 $63,435 45,311
2023-09-30 $152,798 64,201
2023-06-30 $292,285 61,020
2023-03-31 $652,617 115,100
2022-12-31 $27,680 4,943
2021-12-31 $73,453 8,818
2021-09-30 $432,661 62,164
2021-06-30 $1,175,375 49,282
2021-03-31 $672,078 32,641
2020-12-31 $272,464 11,121
2020-09-30 $1,042,544 36,826