Ghost Tree Capital’s Biogen BIIB Stock Holding History

Ghost Tree Capital’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 Q4	–	Sell	-3,750	Closed	-$1M	–	39
2022 Q3	$1M	Buy	+3,750	New	+$796K	0.28%	43
2021 Q3	–	Sell	-32,500	Closed	-$11.3M	–	61
2021 Q2	$11.3M	Buy	32,500 +12,500	+63%	+$3.79M	3.09%	12
2021 Q1	$5.59M	Buy	20,000 +17,800	+809%	+$4.8M	1.32%	24
2020 Q4	$539K	Sell	2,200 -2,000	-48%	-$516K	0.12%	43
2020 Q3	$1.19M	Buy	+4,200	New	+$1.17M	0.34%	39
2020 Q2	–	Sell	-3,250	Closed	-$1.03M	–	45
2020 Q1	$1.03M	Buy	+3,250	New	+$986K	0.27%	45
2017 Q1	–	Sell	-15,000	Closed	-$4.25M	–	71
2016 Q4	$4.25M	Hold	15,000	–	–	1.02%	38
2016 Q3	$4.7M	Sell	15,000 -15,000	-50%	-$4.44M	0.76%	46
2016 Q2	$7.25M	Buy	+30,000	New	+$7.91M	2.1%	17
2016 Q1	–	Sell	-25,000	Closed	-$7.66M	–	54
2015 Q4	$7.66M	Buy	+25,000	New	+$7.18M	3.14%	14
2015 Q3	–	Sell	-30,000	Closed	-$12.1M	–	80
2015 Q2	$12.1M	Buy	+30,000	New	+$12M	3.93%	3
2014 Q2	–	Sell	-6,471	Closed	-$1.98M	–	58
2014 Q1	$1.98M	Sell	6,471 -9,529	-60%	-$3.02M	1.18%	30
2013 Q4	$4.47M	Buy	+16,000	New	+$4.14M	2.75%	9

Other funds holding BIIB

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

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

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

State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return

Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

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

Deutsche Bank Frankfurt Am Main Ge, Germany $344B AUM 42.99% 1-Year Est. Return

ClearBridge Investments New York $121B AUM 27.52% 1-Year Est. Return

D.E. Shaw & Co New York $210B AUM 57.28% 1-Year Est. Return

Ghost Tree Capital's BIIB Position: Q4 2022 in Review

Ghost Tree Capital sold out of Biogen (BIIB) in Q4 2022, closing a stake of 3,750 shares — an estimated $1M sold.

Ghost Tree Capital first reported a position in BIIB in Q4 2013 and held it in 13 quarters. The position peaked at $12.1M in Q2 2015. 1,031 funds tracked by Wall St. Rank hold BIIB as of Q4 2022.

Ghost Tree Capital reported no remaining Biogen position as of Q4 2022 after selling out during the quarter.
Ghost Tree Capital sold 3,750 Biogen shares in Q4 2022, an estimated $1M.
Ghost Tree Capital first reported a position in Biogen in Q4 2013 and held it in 13 quarters.
Ghost Tree Capital's Biogen position peaked at $12.1M in Q2 2015.
1,031 funds tracked by Wall St. Rank held Biogen as of Q4 2022.

Based on Ghost Tree Capital's 13F filing for Q4 2022, filed 14 Feb 2023.