RENAISSANCE TECHNOLOGIES LLC

Position in BIIB — Biogen Inc.

CIK 1037389 NEW YORK, NY

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Position in BIIB

as of Mar 31, 2026 · filed May 14, 2026 Compact

Position Value

$37,288,588

-$32,965,916 QoQ

Shares Held

203,396

-49.0% QoQ

Ownership

0.138%

of shares outstanding

% of Portfolio

0.06%

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)

Position in Drug Manufacturers - General

Healthcare · as of Mar 31, 2026

RENAISSANCE TECHNOLOGIES LLC holds $774,861,209 across 9 Drug Manufacturers - General names. BIIB ranks #6 (4.8% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	GILD	Gilead Sciences, Inc.	2,152,528	$299,997,827
2	NVS	Novartis AG	1,111,833	$169,832,490
3	NVO	Novo Nordisk A S	3,397,121	$124,844,196
4	LLY	ELI LILLY & Co	71,788	$66,028,448
5	BMY	Bristol Myers Squibb Co	977,051	$59,258,143
6	BIIB	Biogen Inc. This page	203,396	$37,288,588
7	GSK	GSK plc	311,292	$17,180,205
8	AMRN	Amarin Corp Plc\Uk	19,256	$278,441

All Filings in BIIB

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25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$37,288,588	203,396	-49.0%	Shares	Sole	2026-05-14
2025-12-31	$70,254,504	399,196	-58.6%	Shares	Sole	2026-02-12
2025-09-30	$135,093,992	964,406	-7.7%	Shares	Sole	2025-11-13
2025-06-30	$131,254,862	1,045,106	+29.9%	Shares	Sole	2025-08-13
2025-03-31	$110,088,601	804,506	-32.5%	Shares	Sole	2025-05-14
2024-12-31	$182,312,141	1,192,206	+25.1%	Shares	Sole	2025-02-13
2024-09-30	$184,672,531	952,706	+54.1%	Shares	Sole	2024-11-13
2024-06-30	$143,289,332	618,106	-30.1%	Shares	Sole	2024-08-09
2024-03-31	$190,768,723	884,704	+16.6%	Shares	Sole	2024-05-13
2023-12-31	$196,304,474	758,606	-30.2%	Shares	Sole	2024-02-13
2023-09-30	$279,214,892	1,086,397	-2.1%	Shares	Sole	2023-11-14
2023-06-30	$316,051,614	1,109,537	-12.2%	Shares	Sole	2023-08-11
2023-03-31	$351,384,601	1,263,837	+26.3%	Shares	Sole	2023-05-12
2022-12-31	$276,996,429	1,000,276	-13.4%	Shares	Sole	2023-02-13
2022-09-30	$308,253,369	1,154,507	-25.3%	Shares	Sole	2022-11-14
2022-06-30	$315,292,667	1,546,007	+48.1%	Shares	Sole	2022-08-12
2022-03-31	$219,909,994	1,044,207	-2.8%	Shares	Sole	2022-05-13
2021-12-31	$257,627,775	1,073,807	+9.4%	Shares	Sole	2022-02-11
2021-09-30	$277,813,263	981,707	-26.2%	Shares	Sole	2021-11-12
2021-06-30	$460,540,138	1,330,003	-31.4%	Shares	Sole	2021-08-13
2021-03-31	$542,200,819	1,938,162	-36.2%	Shares	Sole	2021-05-13
2020-12-31	$743,826,403	3,037,762	-20.4%	Shares	Sole	2021-02-10
2020-09-30	$1,082,795,496	3,816,961	-2.3%	Shares	Sole	2020-11-13
2020-06-30	$1,045,029,431	3,905,922	-12.7%	Shares	Sole	2020-08-13
2020-03-31	$1,415,456,278	4,473,912	—	Shares	Sole	2020-05-14
No filing history on record for this holder in this stock.