SIMPLEX TRADING, LLC

Position in BIIB — Biogen Inc.

CIK 1488542 CHICAGO, IL

Position in BIIB

as of Jun 30, 2026 · filed Aug 12, 2026 Compact

Position Value

$1,940,866

+$1,544,140 QoQ

Shares Held

8,983

+315.1% QoQ

Ownership

0.006%

of shares outstanding

% of Portfolio

0.06%

of 13F equity value

Holder Rank

#348

of 1,036 holders

Holding Since

Dec 2020

14 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Healthcare · as of Jun 30, 2026

SIMPLEX TRADING, LLC holds $31,644,428 across 7 Drug Manufacturers - General names. BIIB ranks #5 (6.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	PFE	Pfizer Inc	640,977	$15,434,726
2	BMY	Bristol Myers Squibb Co	100,185	$5,772,659
3	JNJ	Johnson & Johnson	13,397	$3,402,436
4	OGN	Organon & Co.	145,377	$1,968,404
5	BIIB	Biogen Inc. This page	8,983	$1,940,866
6	ABBV	AbbVie Inc.	7,173	$1,805,013
7	AZN	Astrazeneca PLC	6,963	$1,320,324

14 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$1,940,866	8,983	+315.1%	Shares	Sole	2026-08-12
2026-03-31	$396,726	2,164	-93.0%	Shares	Sole	2026-05-14
2025-12-31	$5,434,219	30,878	+2666.8%	Shares	Sole	2026-02-11
2025-09-30	$156,329	1,116	-83.1%	Shares	Sole	2025-11-12
2025-06-30	$828,768	6,599	+108.9%	Shares	Sole	2025-08-05
2025-03-31	$432,277	3,159	-90.6%	Shares	Sole	2025-05-12
2024-12-31	$5,129,242	33,542	-36.9%	Shares	Sole	2025-02-11
2024-09-30	$10,296,393	53,118	+156.4%	Shares	Sole	2024-11-08
2024-06-30	$4,801,687	20,713	+1331.4%	Shares	Sole	2024-07-25
2023-09-30	$371,893	1,447	-61.7%	Shares	Sole	2023-11-01
2022-06-30	$769,669	3,774	-59.6%	Shares	Sole	2022-08-03
2022-03-31	$1,969,110	9,350	-78.3%	Shares	Sole	2022-05-02
2021-03-31	$12,067,575	43,137	-6.0%	Shares	Sole	2021-04-26
2020-12-31	$11,239,808	45,903	—	Shares	Sole	2021-02-02
No filing history on record for this holder in this stock.