John Overdeck’s Biogen BIIB Stock Holding History

John Overdeck’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
2022 Q1	–	Sell	-5,600	Closed	-$1.34M	–	2783
2021 Q4	$1.34M	Sell	5,600 -3,000	-35%	-$771K	﹤0.01%	2292
2021 Q3	$2.43M	Sell	8,600 -1,800	-17%	-$590K	0.01%	1805
2021 Q2	$3.6M	Buy	+10,400	New	+$3.15M	0.01%	1415
2021 Q1	–	Sell	-13,000	Closed	-$3.18M	–	3821
2020 Q4	$3.18M	Sell	13,000 -10,100	-44%	-$2.61M	0.01%	1198
2020 Q3	$6.55M	Buy	23,100 +18,500	+402%	+$5.16M	0.02%	679
2020 Q2	$1.23M	Sell	4,600 -7,400	-62%	-$2.22M	0.01%	1397
2020 Q1	$3.8M	Sell	12,000 -11,700	-49%	-$3.55M	0.03%	628
2019 Q4	$7.03M	Sell	23,700 -4,800	-17%	-$1.33M	0.02%	771
2019 Q3	$6.63M	Buy	28,500 +10,500	+58%	+$2.44M	0.02%	728
2019 Q2	$4.21M	Buy	18,000 +12,000	+200%	+$2.77M	0.01%	974
2019 Q1	$1.42M	Hold	6,000	–	–	﹤0.01%	1615
2018 Q4	$1.81M	Sell	6,000 -8,000	-57%	-$2.55M	0.01%	1291
2018 Q3	$4.95M	Sell	14,000 -21,700	-61%	-$7.47M	0.01%	952
2018 Q2	$10.4M	Buy	35,700 +19,300	+118%	+$5.43M	0.03%	654
2018 Q1	$4.49M	Buy	16,400 +11,400	+228%	+$3.54M	0.01%	1015
2017 Q4	$1.59M	Sell	5,000 -13,000	-72%	-$4.17M	0.01%	1634
2017 Q3	$5.64M	Buy	18,000 +6,000	+50%	+$1.78M	0.02%	752
2017 Q2	$3.26M	Buy	+12,000	New	+$3.17M	0.01%	1108
2017 Q1	–	Sell	-2,000	Closed	-$567K	–	2907
2016 Q4	$567K	Buy	+2,000	New	+$593K	﹤0.01%	2430
2016 Q2	–	Sell	-5,000	Closed	-$1.3M	–	2910
2016 Q1	$1.3M	Sell	5,000 -27,000	-84%	-$7.13M	0.01%	1445
2015 Q4	$9.8M	Buy	32,000 +31,000	+3,100%	+$8.91M	0.05%	437
2015 Q3	$292K	Sell	1,000 -1,000	-50%	-$330K	﹤0.01%	1799
2015 Q2	$808K	Hold	2,000	–	–	﹤0.01%	1800
2015 Q1	$844K	Buy	+2,000	New	+$788K	﹤0.01%	1680

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 $3.37T 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

Norges Bank Oslo, Norway $1T AUM

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

John Overdeck's BIIB Position: Q2 2026 in Review

John Overdeck reduced its Biogen (BIIB) stake by 25% in Q2 2026, selling an estimated $447K and leaving 7,105 shares worth $1.54M. The position accounts for ﹤0.01% of the portfolio, ranked #3247.

John Overdeck first reported a position in BIIB in Q2 2013 and has held it in 44 quarters since. The position peaked at $160M in Q4 2016. 1,036 funds tracked by Wall St. Rank hold BIIB as of Q2 2026.

John Overdeck held 7,105 shares of Biogen worth $1.54M as of Q2 2026.
John Overdeck sold 2,339 Biogen shares in Q2 2026, an estimated $447K.
Biogen made up ﹤0.01% of John Overdeck's portfolio in Q2 2026, its #3247 holding.
John Overdeck first reported a position in Biogen in Q2 2013 and has held it in 44 quarters since.
John Overdeck's Biogen position peaked at $160M in Q4 2016.
1,036 funds tracked by Wall St. Rank held Biogen as of Q2 2026.

Based on Two Sigma Investments's 13F filing for Q2 2026, filed 14 Aug 2026.