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 Q2	–	Sell	-35,000	Closed	-$6.42M	–	45
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

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 $3.38T AUM 44.17% 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

Tang Capital Management's BIIB Position: Q2 2026 in Review

Tang Capital Management sold out of Biogen (BIIB) in Q2 2026, closing a stake of 35,000 shares — an estimated $6.42M sold.

Tang Capital Management first reported a position in BIIB in Q2 2024 and held it in 8 quarters. The position peaked at $8.11M in Q2 2024. 1,046 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

Tang Capital Management reported no remaining Biogen position as of Q2 2026 after selling out during the quarter.
Tang Capital Management sold 35,000 Biogen shares in Q2 2026, an estimated $6.42M.
Tang Capital Management first reported a position in Biogen in Q2 2024 and held it in 8 quarters.
Tang Capital Management's Biogen position peaked at $8.11M in Q2 2024.
1,046 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Tang Capital Management's 13F filing for Q2 2026, filed 14 Aug 2026.