Holocene Advisors’s Biogen BIIB Stock Holding History

Holocene Advisors’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
2026 Q2	$1.04M	Hold	4,793	–	–	﹤0.01%	675
2026 Q1	$879K	Buy	+4,793	New	+$883K	﹤0.01%	690
2025 Q4	–	Sell	-5,979	Closed	-$838K	–	753
2025 Q3	$838K	Buy	+5,979	New	+$808K	﹤0.01%	639
2023 Q3	–	Sell	-3,791	Closed	-$1.08M	–	722
2023 Q2	$1.08M	Sell	3,791 -190,314	-98%	-$56.7M	﹤0.01%	627
2023 Q1	$54M	Buy	+194,105	New	+$53.7M	0.27%	125
2021 Q3	–	Sell	-1,370	Closed	-$474K	–	812
2021 Q2	$474K	Buy	+1,370	New	+$415K	﹤0.01%	750
2020 Q2	–	Sell	-227,469	Closed	-$68.4M	–	618
2020 Q1	$72M	Sell	227,469 -22,473	-9%	-$6.82M	0.77%	33
2019 Q4	$74.2M	Buy	+249,942	New	+$69.3M	0.66%	50
2018 Q2	–	Sell	-926	Closed	-$254K	–	578
2018 Q1	$254K	Buy	+926	New	+$287K	0.01%	432

Other funds holding BIIB

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return

Norges Bank Oslo, Norway $1T AUM

Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

Holocene Advisors's BIIB Position: Q2 2026 in Review

Holocene Advisors held its Biogen (BIIB) position steady in Q2 2026 at 4,793 shares worth $1.04M. The position accounts for ﹤0.01% of the portfolio, ranked #675.

Holocene Advisors first reported a position in BIIB in Q1 2018 and has held it in 9 quarters since. The position peaked at $74.2M in Q4 2019. 1,043 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

Holocene Advisors held 4,793 shares of Biogen worth $1.04M as of Q2 2026.
Holocene Advisors left its Biogen share count unchanged in Q2 2026.
Biogen made up ﹤0.01% of Holocene Advisors's portfolio in Q2 2026, its #675 holding.
Holocene Advisors first reported a position in Biogen in Q1 2018 and has held it in 9 quarters since.
Holocene Advisors's Biogen position peaked at $74.2M in Q4 2019.
1,043 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Holocene Advisors's 13F filing for Q2 2026, filed 14 Aug 2026.