Stocks
BIIB
Balyasny Asset Management L.P.

Balyasny Asset Management L.P.

CIK

1218710

City

Chicago

State / Country

Stock

BIIB — Biogen Inc.

Top Portfolio Positions

1,959 positions · $66,917,766,316 total · as of Mar 31, 2026

Ticker	Company	Shares	Value (USD)	% of Portfolio
SPY	Spdr S&P 500 ETF Trust	6,144,822	$3,996,223,539	5.97%
QQQ	Invesco Qqq Trust, Series 1	4,746,270	$2,739,452,118	4.09%
META	Meta Platforms, Inc. Communication Services	2,982,339	$1,706,285,612	2.55%
AMZN	Amazon Com Inc Consumer Cyclical	7,656,935	$1,594,709,852	2.38%
NVDA	Nvidia Corp Technology	8,330,677	$1,452,870,068	2.17%
AAPL	Apple Inc. Technology	5,627,148	$1,428,113,890	2.13%
GOOGL	Alphabet Inc. Communication Services	2,910,658	$836,988,814	1.25%
WBD	Warner Bros. Discovery, Inc. Communication Services	27,939,614	$767,221,800	1.15%
RTX	RTX Corp Industrials	3,727,941	$719,119,818	1.07%
MSFT	Microsoft Corp Technology	1,413,996	$523,418,899	0.78%

Portfolio Trend

38 quarters · across all stocks

Holdings in BIIB

Compact Export CSV

Shares Held

Position Value (USD)

37 quarters on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$119,172,933	650,046	+1128.8%	Shares	Sole	2026-05-15
2025-12-31	$9,309,871	52,900	+32.6%	Call	Sole	2026-02-17
2025-12-31	$7,022,001	39,900	-93.4%	Put	Sole	2026-02-17
2025-12-31	$106,993,648	607,953	-50.7%	Shares	Sole	2026-02-17
2025-09-30	$172,879,591	1,234,149	+25086.7%	Shares	Sole	2025-11-14
2025-09-30	$686,392	4,900	+206.2%	Call	Sole	2025-11-14
2025-09-30	$224,128	1,600	-99.8%	Put	Sole	2025-11-14
2025-06-30	$104,478,948	831,905	+5.8%	Shares	Sole	2025-08-14
2025-03-31	$107,586,207	786,219	+1615.5%	Shares	Sole	2025-05-15
2024-12-31	$7,008,170	45,829	+3173.5%	Shares	Sole	2025-02-14
2024-12-31	$214,088	1,400	-91.2%	Call	Sole	2025-02-14
2024-09-30	$3,101,440	16,000	+150.0%	Call	Sole	2024-11-14
2024-09-30	$1,240,576	6,400	-98.4%	Put	Sole	2024-11-14
2024-06-30	$91,542,704	394,887	+24.5%	Shares	Sole	2024-08-14
2023-12-31	$82,108,238	317,302	+37.7%	Shares	Sole	2024-02-14
2023-09-30	$59,217,931	230,411	+284.1%	Shares	Sole	2023-11-14
2023-06-30	$17,087,581	59,988	+130.7%	Shares	Sole	2023-08-14
2023-06-30	$7,406,100	26,000	-89.1%	Call	Sole	2023-08-14
2023-03-31	$66,558,990	239,395	+365.9%	Shares	Other	2023-05-15
2022-12-31	$14,228,979	51,383	-70.8%	Shares	Sole	2023-02-14
2022-09-30	$47,036,055	176,165	+655.9%	Shares	Sole	2022-11-15
2022-06-30	$4,753,025	23,306	-86.1%	Shares	Other	2022-08-15
2022-03-31	$35,417,865	168,176	+18.4%	Shares	Sole	2022-05-16
2022-03-31	$29,905,200	142,000	+52.7%	Call	Sole	2022-05-16
2021-12-31	$22,312,560	93,000	+14.5%	Call	Sole	2022-02-14
2021-12-31	$19,492,060	81,244	+74.6%	Shares	Sole	2022-02-14
2021-09-30	$13,168,939	46,535	-60.9%	Shares	Sole	2021-11-15
2021-09-30	$33,675,810	119,000	+417.4%	Call	Sole	2021-11-15
2021-06-30	$7,964,210	23,000	-83.4%	Call	Sole	2021-08-16
2021-06-30	$47,881,869	138,279	+54.3%	Shares	Sole	2021-08-16
2021-03-31	$25,071,195	89,620	+244.7%	Shares	Sole	2021-05-17
2021-03-31	$7,273,500	26,000	-23.5%	Call	Sole	2021-05-17
2020-12-31	$8,325,240	34,000	-3.2%	Call	Sole	2021-02-16
2020-12-31	$8,603,156	35,135	-45.5%	Shares	Sole	2021-02-16
2020-09-30	$18,297,360	64,500	-57.9%	Call	Sole	2020-11-16
2020-09-30	$43,476,229	153,258	+70.3%	Shares	Sole	2020-11-16
2020-03-31	$28,474,200	90,000	—	Put	Sole	2020-05-15
No 13F history on record for this holder in this stock.