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JANE STREET GROUP, LLC

Position in FULC — Fulcrum Therapeutics, Inc.

CIK 1595888 NEW YORK, NY

Position in FULC

as of Jun 30, 2026 · filed Aug 14, 2026
Position Value
$8,116,041
+$5,735,144 QoQ
Shares Held
2,217,498
+614.4% QoQ
Ownership
2.91%
of shares outstanding
% of Portfolio
0.01%
of 13F equity value
Holder Rank
#9
of 154 holders
Holding Since
Sep 2021
19 quarters on record
Voting authority Sole 100% Shared 0% None 0%

Common Shares in FULC Over Time

Shares Held

Position Value (USD)

Derivatives in FULC

reported options exposure · as of Jun 30, 2026
CallValue
$161,772
CallShares
44,200
PutValue
$87,840
PutShares
24,000

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

JANE STREET GROUP, LLC holds $1,364,050,815 across 292 Biotechnology names. FULC ranks #27 (0.6% of the industry book) .

# Ticker Company Shares Value (USD) Open

All Filings in FULC

Export CSV
30 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $8,116,041 2,217,498
2026-06-30 $161,772 44,200
2026-06-30 $87,840 24,000
2026-03-31 $163,371 21,300
2026-03-31 $2,380,897 310,417
2025-12-31 $5,584,311 493,750
2025-12-31 $415,077 36,700
2025-09-30 $2,957,982 321,520
2025-06-30 $119,897 17,427
2025-03-31 $339,309 117,816
2024-12-31 $212,247 45,159
2024-12-31 $129,250 27,500
2024-09-30 $250,614 70,200
2024-09-30 $428,017 119,893
2024-09-30 $278,817 78,100
2024-06-30 $1,043,111 168,244
2024-03-31 $5,050,984 535,062
2023-12-31 $2,341,237 346,850
2023-09-30 $170,944 38,501
2023-06-30 $218,766 66,293
2023-03-31 $40,623 14,254
2022-12-31 $85,081 11,687
2022-06-30 $185,857 37,930
2022-03-31 $353,756 14,958
2021-12-31 $552,617 31,239
2021-12-31 $237,046 13,400
2021-12-31 $309,575 17,500
2021-09-30 $267,995 9,500
2021-09-30 $1,408,863 49,942
2021-09-30 $1,136,863 40,300