CITADEL ADVISORS LLC

CIK

1423053

City

MIAMI

State / Country

Stock

MRK — Merck & Co., Inc.

Top Portfolio Positions

4,269 positions · $549,594,039,539 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	7.64%
QQQ	Invesco Qqq Trust, Series 1	55,171,964	$31,844,154,181	5.79%
NVDA	Nvidia Corp Technology	137,243,161	$23,935,207,278	4.36%
TSLA	Tesla, Inc. Consumer Cyclical	63,922,509	$23,763,192,720	4.32%
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	2.49%
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	1.95%
MU	Micron Technology Inc Technology	31,629,772	$10,685,802,171	1.94%

Portfolio Trend

25 quarters · across all stocks

Holdings in MRK

Compact Export CSV

Shares Held

Position Value (USD)

50 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$450,269,528	3,743,200	-32.6%	Put	Defined	2026-05-15
2026-03-31	$667,826,022	5,551,800	+45.3%	Call	Defined	2026-05-15
2026-03-31	$459,655,395	3,821,227	+13.1%	Shares	Defined	2026-05-15
2025-12-31	$355,557,754	3,377,900	-13.4%	Call	Defined	2026-02-17
2025-12-31	$410,577,156	3,900,600	-42.8%	Put	Defined	2026-02-17
2025-12-31	$718,013,301	6,821,331	+75.6%	Shares	Defined	2026-02-17
2025-09-30	$326,101,622	3,885,400	+301.4%	Put	Defined	2025-11-14
2025-09-30	$81,248,771	968,054	-83.6%	Shares	Defined	2025-11-14
2025-09-30	$496,655,775	5,917,500	+33.1%	Call	Defined	2025-11-14
2025-06-30	$351,937,444	4,445,900	-24.1%	Put	Defined	2025-08-14
2025-06-30	$463,679,700	5,857,500	+8.1%	Call	Defined	2025-08-14
2025-03-31	$486,265,824	5,417,400	+164.4%	Call	Defined	2025-05-15
2025-03-31	$183,894,811	2,048,739	-43.1%	Shares	Defined	2025-05-15
2025-03-31	$322,992,384	3,598,400	-31.9%	Put	Defined	2025-05-15
2024-12-31	$525,424,510	5,281,710	+36.4%	Shares	Defined	2025-02-14
2024-12-31	$385,246,248	3,872,600	+180.9%	Call	Defined	2025-02-14
2024-12-31	$137,133,180	1,378,500	-48.8%	Put	Defined	2025-02-14
2024-09-30	$305,964,708	2,694,300	-61.7%	Call	Defined	2024-11-14
2024-09-30	$799,654,202	7,041,689	+410.8%	Shares	Defined	2024-11-14
2024-09-30	$156,542,460	1,378,500	-83.3%	Put	Defined	2024-11-14
2024-06-30	$1,020,367,894	8,242,067	+238.1%	Shares	Defined	2024-08-14
2024-06-30	$301,836,780	2,438,100	+95.6%	Call	Defined	2024-08-14
2024-06-30	$154,279,560	1,246,200	-27.9%	Put	Defined	2024-08-14
2024-03-31	$228,141,550	1,729,000	-77.2%	Put	Defined	2024-05-15
2024-03-31	$999,550,278	7,575,220	+167.1%	Shares	Defined	2024-05-15
2024-03-31	$374,210,200	2,836,000	-55.1%	Call	Defined	2024-05-15
2023-12-31	$688,807,002	6,318,171	+371.6%	Shares	Defined	2024-02-14
2023-12-31	$146,043,192	1,339,600	-50.9%	Put	Defined	2024-02-14
2023-12-31	$297,700,914	2,730,700	-1.3%	Call	Defined	2024-02-14
2023-09-30	$284,945,010	2,767,800	-58.5%	Call	Defined	2023-11-14
2023-09-30	$687,408,165	6,677,107	+318.3%	Shares	Defined	2023-11-14
2023-09-30	$164,349,380	1,596,400	-29.0%	Put	Defined	2023-11-14
2023-06-30	$259,419,798	2,248,200	+22.2%	Call	Defined	2023-08-14
2023-06-30	$212,302,714	1,839,871	+12.9%	Shares	Defined	2023-08-14
2023-06-30	$188,062,622	1,629,800	+111.3%	Put	Defined	2023-08-14
2023-03-31	$82,042,009	771,144	-68.2%	Shares	Defined	2023-05-15
2023-03-31	$258,283,003	2,427,700	-2.7%	Put	Defined	2023-05-15
2023-03-31	$265,443,050	2,495,000	-30.5%	Call	Defined	2023-05-15
2022-12-31	$398,077,505	3,587,900	+44.3%	Call	Defined	2023-02-14
2022-12-31	$275,895,814	2,486,668	-42.0%	Shares	Defined	2023-02-14
2022-12-31	$475,431,845	4,285,100	+13.3%	Put	Defined	2023-02-14
2022-09-30	$325,611,108	3,780,900	+11.6%	Call	Defined	2022-11-14
2022-09-30	$291,707,040	3,387,216	+57.6%	Shares	Defined	2022-11-14
2022-09-30	$185,097,716	2,149,300	-0.3%	Put	Defined	2022-11-14
2022-06-30	$196,516,022	2,155,490	-27.4%	Shares	Defined	2022-08-15
2022-06-30	$270,729,315	2,969,500	+31.8%	Call	Defined	2022-08-15
2022-06-30	$205,460,712	2,253,600	-37.9%	Put	Defined	2022-08-15
2022-03-31	$297,546,120	3,626,400	+86.3%	Call	Defined	2022-05-16
2022-03-31	$159,743,145	1,946,900	-42.5%	Put	Defined	2022-05-16
2022-03-31	$278,035,040	3,388,605	—	Shares	Defined	2022-05-16
No 13F history on record for this holder in this stock.