Costello Asset Management’s Biogen BIIB Stock Holding History

Costello Asset 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	$64.8K	Hold	300	–	–	0.02%	217
2026 Q1	$55K	Hold	300	–	–	0.02%	217
2025 Q4	$52.8K	Hold	300	–	–	0.02%	215
2025 Q3	$42K	Hold	300	–	–	0.01%	265
2025 Q2	$37.7K	Hold	300	–	–	0.01%	275
2025 Q1	$41.1K	Buy	+300	New	+$42.9K	0.02%	251

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

Costello Asset Management's BIIB Position: Q2 2026 in Review

Costello Asset Management held its Biogen (BIIB) position steady in Q2 2026 at 300 shares worth $64.8K. The position accounts for 0.02% of the portfolio, ranked #217.

Costello Asset Management first reported a position in BIIB in Q1 2025 and has held it in 6 quarters since. 1,046 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

Costello Asset Management held 300 shares of Biogen worth $64.8K as of Q2 2026.
Costello Asset Management left its Biogen share count unchanged in Q2 2026.
Biogen made up 0.02% of Costello Asset Management's portfolio in Q2 2026, its #217 holding.
Costello Asset Management first reported a position in Biogen in Q1 2025 and has held it in 6 quarters since.
1,046 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Costello Asset Management's 13F filing for Q2 2026, filed 28 Jul 2026.