Sage Mountain Advisors’s Biogen BIIB Stock Holding History

Sage Mountain 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 Q1	–	Sell	-2,042	Closed	-$359K	–	320
2025 Q4	$359K	Sell	2,042 -348	-15%	-$56.9K	0.02%	351
2025 Q3	$335K	Buy	+2,390	New	+$323K	0.02%	348

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

Sage Mountain Advisors's BIIB Position: Q1 2026 in Review

Sage Mountain Advisors sold out of Biogen (BIIB) in Q1 2026, closing a stake of 2,042 shares — an estimated $359K sold.

Sage Mountain Advisors first reported a position in BIIB in Q3 2025 and held it in 2 quarters. The position peaked at $359K in Q4 2025. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

Sage Mountain Advisors reported no remaining Biogen position as of Q1 2026 after selling out during the quarter.
Sage Mountain Advisors sold 2,042 Biogen shares in Q1 2026, an estimated $359K.
Sage Mountain Advisors first reported a position in Biogen in Q3 2025 and held it in 2 quarters.
Sage Mountain Advisors's Biogen position peaked at $359K in Q4 2025.
1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Sage Mountain Advisors's 13F filing for Q1 2026, filed 11 May 2026.