Bayesian Capital Management’s Biogen BIIB Stock Holding History

Bayesian Capital 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
2025 Q4	–	Sell	-5,100	Closed	-$714K	–	160
2025 Q3	$714K	Buy	+5,100	New	+$689K	0.15%	214
2025 Q2	–	Sell	-1,940	Closed	-$265K	–	557
2025 Q1	$265K	Buy	+1,940	New	+$277K	0.04%	420
2024 Q2	–	Sell	-8,114	Closed	-$1.75M	–	747
2024 Q1	$1.75M	Sell	8,114 -3,486	-30%	-$816K	0.17%	173
2023 Q4	$3M	Buy	+11,600	New	+$2.85M	0.32%	75
2021 Q3	–	Sell	-11,500	Closed	-$3.98M	–	390
2021 Q2	$3.98M	Buy	+11,500	New	+$3.48M	1.04%	17
2021 Q1	–	Sell	-4,200	Closed	-$1.03M	–	536
2020 Q4	$1.03M	Buy	+4,200	New	+$1.08M	0.27%	100
2020 Q3	–	Sell	-25,000	Closed	-$6.69M	–	520
2020 Q2	$6.69M	Buy	25,000 +14,900	+148%	+$4.48M	1.48%	3
2020 Q1	$3.19M	Sell	10,100 -7,700	-43%	-$2.34M	0.69%	9
2019 Q4	$5.28M	Buy	17,800 +13,500	+314%	+$3.75M	0.9%	11
2019 Q3	$1M	Buy	+4,300	New	+$1M	0.19%	143
2019 Q1	–	Sell	-9,009	Closed	-$2.71M	–	557
2018 Q4	$2.71M	Buy	9,009 +7,700	+588%	+$2.46M	0.56%	30
2018 Q3	$462K	Buy	+1,309	New	+$451K	0.08%	353
2017 Q3	–	Sell	-4,000	Closed	-$1.08M	–	480
2017 Q2	$1.08M	Sell	4,000 -1,676	-30%	-$443K	0.4%	63
2017 Q1	$1.55M	Buy	5,676 +2,566	+83%	+$726K	0.74%	11
2016 Q4	$882K	Buy	3,110 +800	+35%	+$237K	0.22%	162
2016 Q3	$723K	Buy	+2,310	New	+$684K	0.47%	59
2016 Q2	–	Sell	-1,604	Closed	-$418K	–	402
2016 Q1	$418K	Buy	1,604 +557	+53%	+$147K	0.39%	73
2015 Q4	$321K	Buy	+1,047	New	+$301K	0.46%	83

Other funds holding BIIB

Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

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

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

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

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

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

Point72 Asset Management Stamford, Connecticut $78.1B AUM 55.25% 1-Year Est. Return

Norges Bank Oslo, Norway $935B AUM

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

Bayesian Capital Management's BIIB Position: Q4 2025 in Review

Bayesian Capital Management sold out of Biogen (BIIB) in Q4 2025, closing a stake of 5,100 shares — an estimated $714K sold.

Bayesian Capital Management first reported a position in BIIB in Q4 2015 and held it in 18 quarters. The position peaked at $6.69M in Q2 2020. 997 funds tracked by Wall St. Rank hold BIIB as of Q4 2025.

Bayesian Capital Management reported no remaining Biogen position as of Q4 2025 after selling out during the quarter.
Bayesian Capital Management sold 5,100 Biogen shares in Q4 2025, an estimated $714K.
Bayesian Capital Management first reported a position in Biogen in Q4 2015 and held it in 18 quarters.
Bayesian Capital Management's Biogen position peaked at $6.69M in Q2 2020.
997 funds tracked by Wall St. Rank held Biogen as of Q4 2025.

Based on Bayesian Capital Management's 13F filing for Q4 2025, filed 17 Feb 2026.