Ostrum Asset Management’s Biogen BIIB Stock Holding History

Ostrum Asset 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
2026 Q1	$324K	Sell	1,767 -709	-29%	-$131K	0.02%	406
2025 Q4	$436K	Sell	2,476 -8,982	-78%	-$1.47M	0.02%	393
2025 Q3	$1.61M	Sell	11,458 -3,067	-21%	-$415K	0.07%	229
2025 Q2	$1.82M	Sell	14,525 -183	-1%	-$22.8K	0.09%	207
2025 Q1	$2.01M	Sell	14,708 -173	-1%	-$24.7K	0.11%	189
2024 Q4	$2.28M	Sell	14,881 -7,023	-32%	-$1.18M	0.2%	166
2024 Q3	$4.25M	Buy	21,904 +167	+0.8%	+$34.9K	0.35%	59
2024 Q2	$5.04M	Sell	21,737 -1,056	-5%	-$229K	0.44%	43
2024 Q1	$4.91M	Buy	22,793 +2,483	+12%	+$582K	0.39%	55
2023 Q4	$5.26M	Buy	20,310 +9,112	+81%	+$2.24M	0.46%	43
2023 Q3	$2.88M	Buy	11,198 +56	+0.5%	+$15K	0.27%	107
2023 Q2	$3.17M	Buy	11,142 +720	+7%	+$214K	0.27%	117
2023 Q1	$2.9M	Buy	+10,422	New	+$2.88M	0.25%	130
2019 Q1	–	Sell	-2,163	Closed	-$651K	–	146
2018 Q4	$651K	Buy	+2,163	New	+$690K	0.26%	113

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

Ostrum Asset Management's BIIB Position: Q1 2026 in Review

Ostrum Asset Management reduced its Biogen (BIIB) stake by 29% in Q1 2026, selling an estimated $131K and leaving 1,767 shares worth $324K. The position accounts for 0.02% of the portfolio, ranked #406.

Ostrum Asset Management first reported a position in BIIB in Q4 2018 and has held it in 14 quarters since. The position peaked at $5.26M in Q4 2023. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

Ostrum Asset Management held 1,767 shares of Biogen worth $324K as of Q1 2026.
Ostrum Asset Management sold 709 Biogen shares in Q1 2026, an estimated $131K.
Biogen made up 0.02% of Ostrum Asset Management's portfolio in Q1 2026, its #406 holding.
Ostrum Asset Management first reported a position in Biogen in Q4 2018 and has held it in 14 quarters since.
Ostrum Asset Management's Biogen position peaked at $5.26M in Q4 2023.
1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Ostrum Asset Management's 13F filing for Q1 2026, filed 14 May 2026.