Tang Capital Management’s Biogen BIIB Stock Holding History

Tang Capital 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	$6.42M	Hold	35,000	–	–	0.33%	32
2025 Q4	$6.16M	Hold	35,000	–	–	0.3%	56
2025 Q3	$4.9M	Hold	35,000	–	–	0.19%	94
2025 Q2	$4.4M	Hold	35,000	–	–	0.22%	89
2025 Q1	$4.79M	Hold	35,000	–	–	0.27%	76
2024 Q4	$5.35M	Hold	35,000	–	–	0.35%	67
2024 Q3	$6.78M	Hold	35,000	–	–	0.48%	59
2024 Q2	$8.11M	Buy	+35,000	New	+$7.61M	0.83%	40

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

Tang Capital Management's BIIB Position: Q1 2026 in Review

Tang Capital Management held its Biogen (BIIB) position steady in Q1 2026 at 35,000 shares worth $6.42M. The position accounts for 0.33% of the portfolio, ranked #32.

Tang Capital Management first reported a position in BIIB in Q2 2024 and has held it in 8 quarters since. The position peaked at $8.11M in Q2 2024. 1,002 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

Tang Capital Management held 35,000 shares of Biogen worth $6.42M as of Q1 2026.
Tang Capital Management left its Biogen share count unchanged in Q1 2026.
Biogen made up 0.33% of Tang Capital Management's portfolio in Q1 2026, its #32 holding.
Tang Capital Management first reported a position in Biogen in Q2 2024 and has held it in 8 quarters since.
Tang Capital Management's Biogen position peaked at $8.11M in Q2 2024.
1,002 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

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