Balyasny Asset Management L.P.

Position in BIIB — Biogen Inc.

CIK 1218710 Chicago, IL

Back to BIIB Full portfolio

Position in BIIB

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$119,172,933

+$12,179,285 QoQ

Shares Held

650,046

+6.9% QoQ

Ownership

0.440%

of shares outstanding

% of Portfolio

0.25%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

23 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Common Shares in BIIB Over Time

Shares Held

Position Value (USD)

Derivatives in BIIB

reported options exposure · as of Dec 31, 2025

CallValue

$9,309,871

CallShares

52,900

PutValue

$7,022,001

PutShares

39,900

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 Drug Manufacturers - General

Healthcare · as of Mar 31, 2026

Balyasny Asset Management L.P. holds $901,802,235 across 14 Drug Manufacturers - General names. BIIB ranks #4 (13.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	PFE	Pfizer Inc	10,471,388	$294,036,575
2	MRK	Merck & Co., Inc.	1,812,608	$218,038,616
3	JNJ	Johnson & Johnson	600,849	$146,871,529
4	BIIB	Biogen Inc. This page	650,046	$119,172,933
5	SNY	Sanofi	833,780	$40,171,520
6	AZN	Astrazeneca PLC	148,684	$29,323,458
7	LLY	ELI LILLY & Co	17,835	$16,404,097
8	NVO	Novo Nordisk A S	383,146	$14,080,615

All Filings in BIIB

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37 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$119,172,933	650,046	+1529.2%	Shares	Sole	2026-05-15
2025-12-31	$7,022,001	39,900	-93.4%	Put	Sole	2026-02-17
2025-12-31	$106,993,648	607,953	+1049.2%	Shares	Sole	2026-02-17
2025-12-31	$9,309,871	52,900	+3206.2%	Call	Sole	2026-02-17
2025-09-30	$224,128	1,600	-67.3%	Put	Sole	2025-11-14
2025-09-30	$686,392	4,900	-99.6%	Call	Sole	2025-11-14
2025-09-30	$172,879,591	1,234,149	+48.4%	Shares	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	+56058.5%	Shares	Sole	2025-05-15
2024-12-31	$214,088	1,400	-96.9%	Call	Sole	2025-02-14
2024-12-31	$7,008,170	45,829	+186.4%	Shares	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	-31.7%	Shares	Sole	2022-02-14
2021-09-30	$33,675,810	119,000	+155.7%	Call	Sole	2021-12-01
2021-09-30	$13,168,939	46,535	+102.3%	Shares	Sole	2021-12-01
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 filing history on record for this holder in this stock.