IMC-Chicago, LLC

Position in BIIB — Biogen Inc.

CIK 1452861 CHICAGO, IL

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Position in BIIB

as of Jun 30, 2026 · filed Aug 6, 2026 Compact

Position Value

$4,461,422

+$1,115,677 QoQ

Shares Held

20,649

+8.6% QoQ

Ownership

0.014%

of shares outstanding

% of Portfolio

0.05%

of 13F equity value

Holder Rank

#259

of 1,031 holders

Holding Since

Dec 2020

6 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Common Shares in BIIB Over Time

Shares Held

Position Value (USD)

Derivatives in BIIB

reported options exposure · as of Sep 30, 2021

CallValue

$32,713,644

CallShares

115,600

PutValue

$39,873,291

PutShares

140,900

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 Jun 30, 2026

IMC-Chicago, LLC holds $56,648,218 across 9 Drug Manufacturers - General names. BIIB ranks #3 (7.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	LLY	ELI LILLY & Co	25,449	$30,524,296
2	BMY	Bristol Myers Squibb Co	128,157	$7,384,406
3	BIIB	Biogen Inc. This page	20,649	$4,461,422
4	PFE	Pfizer Inc	173,689	$4,182,431
5	AMGN	Amgen Inc	8,927	$3,232,645
6	GILD	Gilead Sciences, Inc.	23,216	$2,933,109
7	NVS	Novartis AG	9,740	$1,526,452
8	AZN	Astrazeneca PLC	7,754	$1,470,313

All Filings in BIIB

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8 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$4,461,422	20,649	+8.6%	Shares	Sole	2026-08-06
2025-12-31	$3,345,745	19,011	+86.0%	Shares	Sole	2026-01-29
2021-12-31	$2,452,462	10,222	-10.8%	Shares	Sole	2022-02-08
2021-09-30	$39,873,291	140,900	—	Put	Sole	2021-11-05
2021-09-30	$32,713,644	115,600	—	Call	Sole	2021-11-05
2021-09-30	$3,244,480	11,465	-53.0%	Shares	Sole	2021-11-05
2021-06-30	$8,450,719	24,405	+103.4%	Shares	Sole	2021-08-06
2020-12-31	$2,937,830	11,998	—	Shares	Sole	2021-02-17
No filing history on record for this holder in this stock.