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Equibles

CITADEL ADVISORS LLC

Position in SPRO — Spero Therapeutics, Inc.

CIK 1423053 MIAMI, FL
Back to SPRO Full portfolio

Position in SPRO

as of Jun 30, 2026 · filed Sep 2, 2026
Position Value
$0
-$880,911 QoQ
Shares Held
0
-100.0% QoQ
Ownership
0.000%
of shares outstanding
% of Portfolio
0.00%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Sep 2020
19 quarters on record

Common Shares in SPRO Over Time

Shares Held

Position Value (USD)

Derivatives in SPRO

reported options exposure · as of Jun 30, 2026
CallValue
$0
CallShares
0
PutValue
$144,976
PutShares
65,600

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 $6,150,763,744 across 435 Biotechnology names.

# Ticker Company Shares Value (USD) Open
1 ONC
BeOne Medicines Ltd.
 1,425,517 $406,229,578
2 BBIO
BridgeBio Pharma, Inc.
 3,760,028 $280,046,885
3 INSM
INSMED Inc
 2,556,973 $272,624,460
4 MDGL
Madrigal Pharmaceuticals, Inc.
 507,233 $272,358,759
5 VRTX
Vertex Pharmaceuticals Inc / Ma
 510,430 $253,545,893
6 JAZZ
Jazz Pharmaceuticals plc
 1,006,676 $242,578,715
7 MANE
Veradermics, Inc
 1,877,775 $230,853,658
8 ROIV
Roivant Sciences Ltd.
 5,576,261 $197,343,876

All Filings in SPRO

Export CSV
46 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $144,976 65,600
2026-03-31 $52,650 22,500
2026-03-31 $880,911 376,458
2026-03-31 $62,478 26,700
2025-12-31 $170,323 73,100
2025-12-31 $927,022 397,864
2025-09-30 $103,024 54,800
2025-06-30 $397,880 137,200
2025-06-30 $300,979 103,786
2025-03-31 $6,696 9,300
2025-03-31 $44,147 61,316
2025-03-31 $72 100
2024-12-31 $206 200
2024-12-31 $178,057 172,872
2024-12-31 $206 200
2024-09-30 $109,109 81,425
2024-09-30 $268 200
2024-09-30 $268 200
2024-06-30 $650 500
2024-06-30 $405,644 312,034
2024-06-30 $1,300 1,000
2023-12-31 $47,442 32,274
2023-06-30 $145 100
2023-06-30 $21,686 14,956
2023-06-30 $870 600
2022-06-30 $80,287 108,351
2022-06-30 $30,232 40,800
2022-06-30 $27,120 36,600
2022-03-31 $93,933 10,797
2022-03-31 $146,160 16,800
2021-12-31 $249,756 15,600
2021-12-31 $438,674 27,400
2021-09-30 $614,894 33,400
2021-09-30 $541,254 29,400
2021-06-30 $364,356 26,100
2021-06-30 $164,895 11,812
2021-06-30 $534,668 38,300
2021-03-31 $622,656 42,300
2021-03-31 $295,577 20,080
2021-03-31 $456,320 31,000
2020-12-31 $1,244,838 64,200
2020-12-31 $632,849 32,638
2020-12-31 $606,907 31,300
2020-09-30 $237,819 21,310
2020-09-30 $309,132 27,700
2020-09-30 $178,560 16,000