Marathon Trading Investment Management’s Biogen BIIB Stock Holding History

Marathon Trading Investment 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	–	Sell	-1,450	Closed	-$255K	–	302
2025 Q4	$255K	Sell	1,450 -300	-17%	-$49K	0.01%	227
2025 Q3	$245K	Sell	1,750 -1,000	-36%	-$135K	0.02%	201
2025 Q2	$345K	Hold	2,750	–	–	0.04%	151
2025 Q1	$376K	Sell	2,750 -11,783	-81%	-$1.68M	0.05%	164
2024 Q4	$2.22M	Buy	+14,533	New	+$2.45M	0.12%	77
2024 Q2	–	Sell	-3,000	Closed	-$647K	–	307
2024 Q1	$647K	Buy	+3,000	New	+$703K	0.05%	137
2020 Q4	–	Sell	-745	Closed	-$211K	–	348
2020 Q3	$211K	Buy	+745	New	+$208K	0.02%	242
2019 Q2	–	Sell	-1,030	Closed	-$243K	–	225
2019 Q1	$243K	Buy	+1,030	New	+$324K	0.03%	209

Other funds holding BIIB

BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return

Primecap Management Pasadena, California $169B AUM 114.72% 1-Year Est. Return

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM

State Street Boston, Massachusetts $3.37T AUM 44.26% 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

Morgan Stanley New York $1.89T AUM 35.08% 1-Year Est. Return

JP Morgan Chase New York $1.81T AUM 41.13% 1-Year Est. Return

Marathon Trading Investment Management's BIIB Position: Q1 2026 in Review

Marathon Trading Investment Management sold out of Biogen (BIIB) in Q1 2026, closing a stake of 1,450 shares — an estimated $255K sold.

Marathon Trading Investment Management first reported a position in BIIB in Q1 2019 and held it in 8 quarters. The position peaked at $2.22M in Q4 2024. 1,009 funds tracked by Wall St. Rank hold BIIB as of Q1 2026.

Marathon Trading Investment Management reported no remaining Biogen position as of Q1 2026 after selling out during the quarter.
Marathon Trading Investment Management sold 1,450 Biogen shares in Q1 2026, an estimated $255K.
Marathon Trading Investment Management first reported a position in Biogen in Q1 2019 and held it in 8 quarters.
Marathon Trading Investment Management's Biogen position peaked at $2.22M in Q4 2024.
1,009 funds tracked by Wall St. Rank held Biogen as of Q1 2026.

Based on Marathon Trading Investment Management's 13F filing for Q1 2026, filed 14 May 2026.