XTX Topco’s Biogen BIIB Stock Holding History

XTX Topco’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	-2,459	Closed	-$433K	–	3852
2025 Q4	$433K	Buy	+2,459	New	+$402K	0.01%	1735
2025 Q2	–	Sell	-16,743	Closed	-$2.29M	–	2382
2025 Q1	$2.29M	Buy	16,743 +14,459	+633%	+$2.07M	0.12%	209
2024 Q4	$349K	Sell	2,284 -4,671	-67%	-$788K	0.03%	1088
2024 Q3	$1.35M	Buy	+6,955	New	+$1.46M	0.1%	296
2024 Q2	–	Sell	-7,176	Closed	-$1.55M	–	1879
2024 Q1	$1.55M	Buy	7,176 +4,036	+129%	+$945K	0.21%	61
2023 Q4	$813K	Buy	3,140 +1,021	+48%	+$251K	0.18%	63
2023 Q3	$545K	Sell	2,119 -265	-11%	-$70.9K	0.09%	347
2023 Q2	$679K	Buy	+2,384	New	+$710K	0.12%	222
2023 Q1	–	Sell	-830	Closed	-$230K	–	1276
2022 Q4	$230K	Sell	830 -543	-40%	-$153K	0.05%	758
2022 Q3	$367K	Sell	1,373 -1,144	-45%	-$243K	0.09%	382
2022 Q2	$513K	Buy	2,517 +512	+26%	+$105K	0.21%	108
2022 Q1	$422K	Buy	2,005 +1,148	+134%	+$250K	0.19%	182
2021 Q4	$206K	Sell	857 -1,643	-66%	-$422K	0.12%	360
2021 Q3	$707K	Buy	+2,500	New	+$819K	0.24%	99

Other funds holding BIIB

BlackRock New York $5.7T AUM 30.48% 1-Year Est. Return

Primecap Management

Primecap Management Pasadena, California $127B AUM 44.11% 1-Year Est. Return

Fidelity Investments

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM

State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return

Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM

Geode Capital Management

Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return

Wellington Management Group

Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return

Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

JP Morgan Chase

JP Morgan Chase New York $1.47T AUM 27.86% 1-Year Est. Return