CITADEL ADVISORS LLC

CIK

1423053

City

MIAMI

State / Country

Stock

SPRO — Spero Therapeutics, Inc.

Top Portfolio Positions

4,277 positions · $548,325,010,314 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio
SPY	Spdr S&P 500 ETF Trust	64,565,975	$41,989,836,181	7.66%
QQQ	Invesco Qqq Trust, Series 1	55,171,964	$31,844,154,181	5.81%
NVDA	Nvidia Corp Technology	137,243,161	$23,935,207,278	4.37%
TSLA	Tesla, Inc. Consumer Cyclical	63,922,509	$23,763,192,720	4.33%
GLD	Spdr Gold Trust	34,441,722	$14,819,928,559	2.70%
AAPL	Apple Inc. Technology	55,393,070	$14,058,207,235	2.56%
META	Meta Platforms, Inc. Communication Services	23,967,037	$13,712,260,878	2.50%
MSFT	Microsoft Corp Technology	32,176,424	$11,910,746,871	2.17%
AMZN	Amazon Com Inc Consumer Cyclical	51,582,437	$10,743,074,153	1.96%
MU	Micron Technology Inc Technology	31,629,772	$10,685,802,171	1.95%

Portfolio Trend

25 quarters · across all stocks

Holdings in SPRO

Compact Export CSV

Shares Held

Position Value (USD)

45 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$52,650	22,500	-94.0%	Put	Defined	2026-05-15
2026-03-31	$880,911	376,458	+1310.0%	Shares	Defined	2026-05-15
2026-03-31	$62,478	26,700	-63.5%	Call	Defined	2026-05-15
2025-12-31	$170,323	73,100	-81.6%	Put	Defined	2026-02-17
2025-12-31	$927,022	397,864	+626.0%	Shares	Defined	2026-02-17
2025-09-30	$103,024	54,800	-60.1%	Put	Defined	2025-11-14
2025-06-30	$397,880	137,200	+32.2%	Put	Defined	2025-08-14
2025-06-30	$300,979	103,786	+1016.0%	Shares	Defined	2025-08-14
2025-03-31	$6,696	9,300	-84.8%	Call	Defined	2025-05-15
2025-03-31	$44,147	61,316	+61216.0%	Shares	Defined	2025-05-15
2025-03-31	$72	100	-50.0%	Put	Defined	2025-05-15
2024-12-31	$206	200	-99.9%	Put	Defined	2025-02-14
2024-12-31	$178,057	172,872	+86336.0%	Shares	Defined	2025-02-14
2024-12-31	$206	200	-99.8%	Call	Defined	2025-02-14
2024-09-30	$109,109	81,425	+40612.5%	Shares	Defined	2024-11-14
2024-09-30	$268	200	0.0%	Put	Defined	2024-11-14
2024-09-30	$268	200	-60.0%	Call	Defined	2024-11-14
2024-06-30	$650	500	-99.8%	Call	Defined	2024-08-14
2024-06-30	$405,644	312,034	+31103.4%	Shares	Defined	2024-08-14
2024-06-30	$1,300	1,000	-96.9%	Put	Defined	2024-08-14
2023-12-31	$47,442	32,274	+32174.0%	Shares	Defined	2024-02-14
2023-06-30	$145	100	-99.3%	Call	Defined	2023-08-14
2023-06-30	$21,686	14,956	+2392.7%	Shares	Defined	2023-08-14
2023-06-30	$870	600	-99.4%	Put	Defined	2023-08-14
2022-06-30	$80,287	108,351	+165.6%	Shares	Defined	2022-08-15
2022-06-30	$30,232	40,800	+11.5%	Call	Defined	2022-08-15
2022-06-30	$27,120	36,600	+239.0%	Put	Defined	2022-08-15
2022-03-31	$93,933	10,797	-35.7%	Shares	Defined	2022-05-16
2022-03-31	$146,160	16,800	+7.7%	Call	Defined	2022-05-16
2021-12-31	$249,756	15,600	-43.1%	Call	Defined	2022-02-14
2021-12-31	$438,674	27,400	-18.0%	Put	Defined	2022-02-14
2021-09-30	$614,894	33,400	+13.6%	Call	Defined	2021-11-15
2021-09-30	$541,254	29,400	+12.6%	Put	Defined	2021-11-15
2021-06-30	$364,356	26,100	+121.0%	Put	Defined	2021-08-16
2021-06-30	$164,895	11,812	-69.2%	Shares	Defined	2021-08-16
2021-06-30	$534,668	38,300	+23.5%	Call	Defined	2021-08-16
2021-03-31	$456,320	31,000	+54.4%	Call	Defined	2021-05-21
2021-03-31	$295,577	20,080	-52.5%	Shares	Defined	2021-05-21
2021-03-31	$622,656	42,300	-34.1%	Put	Defined	2021-05-21
2020-12-31	$1,244,838	64,200	+96.7%	Put	Defined	2021-02-16
2020-12-31	$632,849	32,638	+4.3%	Shares	Defined	2021-02-16
2020-12-31	$606,907	31,300	+46.9%	Call	Defined	2021-02-16
2020-09-30	$237,819	21,310	-23.1%	Shares	Defined	2020-11-16
2020-09-30	$309,132	27,700	+73.1%	Put	Defined	2020-11-16
2020-09-30	$178,560	16,000	—	Call	Defined	2020-11-16
No 13F history on record for this holder in this stock.