SIH Partners’s Biogen BIIB Stock Holding History

SIH Partners’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	–	Sell	-1,463	Closed	-$268K	–	338
2026 Q1	$268K	Buy	+1,463	New	+$270K	﹤0.01%	255
2025 Q2	–	Sell	-10,414	Closed	-$1.43M	–	186
2025 Q1	$1.43M	Buy	+10,414	New	+$1.49M	0.05%	103

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

SIH Partners's BIIB Position: Q2 2026 in Review

SIH Partners sold out of Biogen (BIIB) in Q2 2026, closing a stake of 1,463 shares — an estimated $268K sold.

SIH Partners first reported a position in BIIB in Q1 2025 and held it in 2 quarters. The position peaked at $1.43M in Q1 2025. 1,043 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

SIH Partners reported no remaining Biogen position as of Q2 2026 after selling out during the quarter.
SIH Partners sold 1,463 Biogen shares in Q2 2026, an estimated $268K.
SIH Partners first reported a position in Biogen in Q1 2025 and held it in 2 quarters.
SIH Partners's Biogen position peaked at $1.43M in Q1 2025.
1,043 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on SIH Partners's 13F filing for Q2 2026, filed 14 Aug 2026.