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CITADEL ADVISORS LLC

Position in MCRB — Seres Therapeutics, Inc.

CIK 1423053 MIAMI, FL

Position in MCRB

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$82,876
+$82,876 QoQ
Shares Held
10,504
Ownership
0.106%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
#18
of 36 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in MCRB Over Time

Shares Held

Position Value (USD)

Derivatives in MCRB

reported options exposure · as of Jun 30, 2026
CallValue
$0
CallShares
0
PutValue
$343,215
PutShares
43,500

Notional value of option positions as reported on Form 13F. Calls and puts are disclosed separately and do not net against the common-share stake above.

Position in Biotechnology

Healthcare · as of Jun 30, 2026

CITADEL ADVISORS LLC holds $6,088,670,159 across 436 Biotechnology names. MCRB ranks #363 (0.0% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in MCRB

Export CSV
50 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $343,215 43,500
2026-06-30 $82,876 10,504
2026-03-31 $527,765 59,500
2025-12-31 $637,310 42,830
2025-12-31 $467,499 31,418
2025-09-30 $468,109 24,330
2025-09-30 $577,392 30,010
2025-09-30 $594,227 30,885
2025-06-30 $119,099 10,720
2025-03-31 $9,800 14,000
2025-03-31 $19,670 28,100
2025-03-31 $33 48
2024-12-31 $69,804 84,000
2024-12-31 $25 31
2024-12-31 $206,586 248,600
2024-09-30 $119,479 126,300
2024-09-30 $180,023 190,300
2024-06-30 $94,771 130,900
2024-06-30 $71,458 98,700
2024-03-31 $139,320 180,000
2024-03-31 $3,467 4,480
2024-03-31 $28,560 36,900
2023-12-31 $1,516 1,083
2023-12-31 $87,780 62,700
2023-12-31 $103,600 74,000
2023-09-30 $255,374 107,300
2023-09-30 $161,602 67,900
2023-09-30 $447,135 187,872
2023-06-30 $1,051,884 219,600
2023-06-30 $666,289 139,100
2023-06-30 $200,092 41,773
2023-03-31 $3,003,358 529,693
2023-03-31 $349,839 61,700
2023-03-31 $375,354 66,200
2022-12-31 $14,722 2,629
2022-12-31 $339,920 60,700
2022-12-31 $95,200 17,000
2022-09-30 $87,312 13,600
2022-09-30 $215,634 33,588
2022-09-30 $414,732 64,600
2022-06-30 $89,523 26,100
2022-06-30 $59,339 17,300
2022-06-30 $562,831 164,091
2022-03-31 $340,336 47,800
2022-03-31 $134,568 18,900
2022-03-31 $1,687,275 236,977
2021-12-31 $464,814 55,800
2021-12-31 $438,991 52,700
2021-12-31 $3,296,447 395,732
2021-09-30 $448,920 64,500