Boothbay Fund Management’s Biogen BIIB Stock Holding History

Boothbay Fund Management’s Portfolio BIIB Stock Details BIIB Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2022 Q4	–	Sell	-85,100	Closed	-$22.7M	–	2011
2022 Q3	$22.7M	Buy	+85,100	New	+$18.1M	0.57%	8
2022 Q1	–	Sell	-6,700	Closed	-$1.61M	–	2278
2021 Q4	$1.61M	Buy	+6,700	New	+$1.72M	0.04%	558
2021 Q1	–	Sell	-378	Closed	-$9.26M	–	1544
2020 Q4	$9.26M	Buy	378 +232	+159%	+$59.9K	0.34%	36
2020 Q3	$4.14M	Buy	+146	New	+$40.7K	0.25%	83
2019 Q2	–	Sell	-91	Closed	-$2.15M	–	747
2019 Q1	$2.15M	Buy	91 +2	+2%	+$630	0.21%	113
2018 Q4	$2.68M	Buy	+89	New	+$28.4K	0.39%	50

Other funds holding BIIB

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

VCM

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

VPM

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

JP Morgan Chase New York $1.56T AUM 27.86% 1-Year Est. Return

Boothbay Fund Management's BIIB Position: Q1 2026 in Review

Boothbay Fund Management opened a new position in Biogen (BIIB) in Q1 2026: 14,268 shares worth $2.62M. The stake represents 0.03% of the portfolio and ranks #517 among its holdings. This is a return to the name: Boothbay Fund Management previously reported a position in BIIB as recently as Q3 2025.

Boothbay Fund Management first reported a position in BIIB in Q2 2016 and has held it in 23 quarters since. The position peaked at $6.76M in Q2 2021. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

Boothbay Fund Management held 14,268 shares of Biogen worth $2.62M as of Q1 2026.
Biogen was a new Boothbay Fund Management position in Q1 2026.
Biogen made up 0.03% of Boothbay Fund Management's portfolio in Q1 2026, its #517 holding.
Boothbay Fund Management first reported a position in Biogen in Q2 2016 and has held it in 23 quarters since.
Boothbay Fund Management's Biogen position peaked at $6.76M in Q2 2021.
1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Boothbay Fund Management's 13F filing for Q1 2026, filed 15 May 2026.