Picton Mahoney Asset Management’s Biogen BIIB Stock Holding History

Picton Mahoney 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	$10.1M	Buy	+46,536	New	+$8.9M	0.07%	243
2023 Q3	–	Sell	-18,202	Closed	-$5.19M	–	433
2023 Q2	$5.19M	Buy	18,202 +959	+6%	+$285K	0.22%	135
2023 Q1	$4.79M	Buy	+17,243	New	+$4.77M	0.21%	147
2015 Q3	–	Sell	-77,600	Closed	-$31.3M	–	292
2015 Q2	$31.3M	Buy	77,600 +47,800	+160%	+$19.2M	1.55%	8
2015 Q1	$12.6M	Buy	+29,800	New	+$11.7M	0.48%	66
2014 Q3	–	Sell	-4,800	Closed	-$1.51M	–	314
2014 Q2	$1.51M	Buy	+4,800	New	+$1.44M	0.09%	143

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

Picton Mahoney Asset Management's BIIB Position: Q2 2026 in Review

Picton Mahoney Asset Management opened a new position in Biogen (BIIB) in Q2 2026: 46,536 shares worth $10.1M. The stake represents 0.07% of the portfolio and ranks #243 among its holdings. This is a return to the name: Picton Mahoney Asset Management previously reported a position in BIIB as recently as Q2 2023.

Picton Mahoney Asset Management first reported a position in BIIB in Q2 2014 and has held it in 6 quarters since. The position peaked at $31.3M in Q2 2015. 1,046 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

Picton Mahoney Asset Management held 46,536 shares of Biogen worth $10.1M as of Q2 2026.
Biogen was a new Picton Mahoney Asset Management position in Q2 2026.
Biogen made up 0.07% of Picton Mahoney Asset Management's portfolio in Q2 2026, its #243 holding.
Picton Mahoney Asset Management first reported a position in Biogen in Q2 2014 and has held it in 6 quarters since.
Picton Mahoney Asset Management's Biogen position peaked at $31.3M in Q2 2015.
1,046 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Picton Mahoney Asset Management's 13F filing for Q2 2026, filed 13 Aug 2026.