Seneschal Advisors’s Biogen BIIB Stock Holding History

Seneschal 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 Q3	$452	Hold	2	–	–	﹤0.01%	443
2026 Q2	$433	Hold	2	–	–	﹤0.01%	434
2026 Q1	$367	Hold	2	–	–	﹤0.01%	431
2025 Q4	$352	Buy	+2	New	+$327	﹤0.01%	448

Other funds holding BIIB

Fidelity Investments Boston, Massachusetts $2.32T AUM 44.66% 1-Year Est. Return

BlackRock New York $6.79T AUM 37.06% 1-Year Est. Return

Primecap Management Pasadena, California $161B AUM 86.05% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.76T AUM

State Street Boston, Massachusetts $3.44T AUM 36.12% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $2.21T AUM

Geode Capital Management Boston, Massachusetts $1.92T AUM 36.1% 1-Year Est. Return

Morgan Stanley New York $1.96T AUM 27.49% 1-Year Est. Return

JP Morgan Chase New York $1.84T AUM 33.86% 1-Year Est. Return

Invesco Atlanta, Georgia $1.27T AUM 50.62% 1-Year Est. Return

Seneschal Advisors's BIIB Position: Q3 2026 in Review

Seneschal Advisors held its Biogen (BIIB) position steady in Q3 2026 at 2 shares worth $452. The position accounts for ﹤0.01% of the portfolio, ranked #443.

Seneschal Advisors first reported a position in BIIB in Q4 2025 and has held it in 4 quarters since. 881 funds tracked by Wall St. Rank hold BIIB as of Q3 2026.

Seneschal Advisors held 2 shares of Biogen worth $452 as of Q3 2026.
Seneschal Advisors left its Biogen share count unchanged in Q3 2026.
Biogen made up ﹤0.01% of Seneschal Advisors's portfolio in Q3 2026, its #443 holding.
Seneschal Advisors first reported a position in Biogen in Q4 2025 and has held it in 4 quarters since.
881 funds tracked by Wall St. Rank held Biogen as of Q3 2026.

Based on Seneschal Advisors's 13F filing for Q3 2026, filed 13 Nov 2026.