JANE STREET GROUP, LLC

Position in BIIB — Biogen Inc.

CIK 1595888 NEW YORK, NY

Back to BIIB Full portfolio

Position in BIIB

as of Mar 31, 2026 · filed May 12, 2026 Compact

Position Value

$1,919,281

-$2,223,346 QoQ

Shares Held

10,469

-55.5% QoQ

Ownership

0.007%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 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 Mar 31, 2026

CallValue

$19,927,971

CallShares

108,700

PutValue

$31,477,761

PutShares

171,700

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

JANE STREET GROUP, LLC holds $859,838,957 across 13 Drug Manufacturers - General names. BIIB ranks #13 (0.2% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	AZN	Astrazeneca PLC	844,701	$166,591,930
2	BMY	Bristol Myers Squibb Co	2,265,508	$137,403,059
3	LLY	ELI LILLY & Co	115,863	$106,567,309
4	GILD	Gilead Sciences, Inc.	666,637	$92,909,198
5	NVO	Novo Nordisk A S	2,024,007	$74,382,257
6	NVS	Novartis AG	366,467	$55,977,834
7	PFE	Pfizer Inc	1,883,213	$52,880,620
8	MRK	Merck & Co., Inc.	351,131	$42,237,546

All Filings in BIIB

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50 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$31,477,761	171,700	+58.0%	Put	Defined	2026-05-12
2026-03-31	$19,927,971	108,700	+938.3%	Call	Defined	2026-05-12
2026-03-31	$1,919,281	10,469	-94.5%	Shares	Defined	2026-05-12
2025-12-31	$33,420,501	189,900	+706.7%	Put	Defined	2026-02-12
2025-12-31	$4,142,627	23,539	-93.3%	Shares	Defined	2026-02-12
2025-12-31	$61,842,886	351,400	+6480.5%	Call	Defined	2026-02-12
2025-09-30	$748,026	5,340	-97.4%	Shares	Defined	2025-11-14
2025-09-30	$29,094,616	207,700	-45.8%	Put	Defined	2025-11-14
2025-09-30	$53,720,680	383,500	+18.7%	Call	Defined	2025-11-14
2025-06-30	$40,565,570	323,000	+877.6%	Put	Defined	2025-08-14
2025-06-30	$4,149,619	33,041	-89.4%	Shares	Defined	2025-08-14
2025-06-30	$39,246,875	312,500	+738.8%	Call	Defined	2025-08-14
2025-03-31	$5,097,836	37,254	-82.3%	Shares	Defined	2025-05-19
2025-03-31	$28,777,452	210,300	+21.6%	Put	Defined	2025-05-19
2025-03-31	$23,673,320	173,000	-14.6%	Call	Defined	2025-05-19
2024-12-31	$30,987,402	202,638	+172.7%	Shares	Defined	2025-02-14
2024-12-31	$11,361,956	74,300	-50.1%	Put	Defined	2025-02-14
2024-12-31	$22,769,788	148,900	+35.0%	Call	Defined	2025-02-14
2024-09-30	$21,378,418	110,289	+68.9%	Shares	Defined	2024-11-15
2024-09-30	$12,657,752	65,300	-12.3%	Put	Defined	2024-11-15
2024-09-30	$14,441,080	74,500	-58.2%	Call	Defined	2024-11-15
2024-06-30	$41,302,441	178,166	+107.2%	Shares	Defined	2024-08-15
2024-03-31	$18,542,885	85,994	-58.0%	Shares	Defined	2024-05-16
2023-12-31	$52,967,113	204,688	+336.9%	Shares	Defined	2024-02-15
2023-09-30	$12,041,946	46,854	-65.3%	Shares	Defined	2023-11-15
2023-06-30	$38,429,967	134,913	+170.3%	Shares	Defined	2023-08-14
2023-03-31	$13,876,475	49,910	-76.0%	Shares	Defined	2023-05-16
2022-12-31	$57,483,330	207,581	-31.8%	Shares	Defined	2023-02-15
2022-09-30	$81,312,180	304,540	+60.5%	Shares	Defined	2022-11-15
2022-06-30	$38,689,457	189,710	-40.2%	Shares	Defined	2022-08-16
2022-03-31	$66,781,260	317,100	+72.8%	Put	Defined	2022-05-17
2022-03-31	$38,641,519	183,483	-23.7%	Shares	Defined	2022-05-17
2022-03-31	$50,649,300	240,500	-28.5%	Call	Defined	2022-05-17
2021-12-31	$80,661,104	336,200	+109.5%	Put	Defined	2022-02-15
2021-12-31	$38,504,999	160,491	-49.5%	Shares	Defined	2022-02-15
2021-12-31	$76,198,592	317,600	-33.6%	Call	Defined	2022-02-15
2021-09-30	$135,410,715	478,500	+43.3%	Call	Defined	2021-11-16
2021-09-30	$94,518,660	334,000	+254.7%	Put	Defined	2021-11-16
2021-09-30	$26,649,167	94,170	-85.6%	Shares	Defined	2021-11-16
2021-06-30	$225,906,548	652,400	+689.0%	Call	Defined	2021-08-16
2021-06-30	$28,631,679	82,686	-78.8%	Shares	Defined	2021-08-16
2021-06-30	$135,183,808	390,400	+26.3%	Put	Defined	2021-08-16
2021-03-31	$86,442,750	309,000	+151.8%	Call	Defined	2021-05-18
2021-03-31	$34,323,925	122,695	-45.5%	Shares	Defined	2021-05-18
2021-03-31	$62,999,700	225,200	-16.9%	Put	Defined	2021-05-18
2020-12-31	$66,381,546	271,100	-44.0%	Call	Defined	2021-02-17
2020-12-31	$118,438,782	483,700	+97.6%	Put	Defined	2021-02-17
2020-12-31	$59,944,419	244,811	-24.6%	Shares	Defined	2021-02-17
2020-09-30	$92,054,160	324,500	+18.8%	Put	Defined	2020-11-17
2020-09-30	$77,501,376	273,200	—	Call	Defined	2020-11-17
No filing history on record for this holder in this stock.