Rock Springs Capital Management’s Spark Therapeutics, Inc. Common Stock ONCE Stock Holding History

Rock Springs Capital Management’s Portfolio ONCE Stock Details ONCE Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2015 Q4	–	Sell	-45,700	Closed	-$1.91M	–	128
2015 Q3	$1.91M	Buy	+45,700	New	+$2.38M	0.15%	111

Rock Springs Capital Management's ONCE Position: Q4 2019 in Review

Rock Springs Capital Management sold out of Spark Therapeutics, Inc. Common Stock (ONCE) in Q4 2019, closing a stake of 505,371 shares — an estimated $49M sold.

Rock Springs Capital Management first reported a position in ONCE in Q1 2015 and held it in 19 quarters. The position peaked at $61.2M in Q1 2019. 0 funds tracked by Wall St. Rank hold ONCE as of Q4 2019.

Rock Springs Capital Management reported no remaining Spark Therapeutics, Inc. Common Stock position as of Q4 2019 after selling out during the quarter.
Rock Springs Capital Management sold 505,371 Spark Therapeutics, Inc. Common Stock shares in Q4 2019, an estimated $49M.
Rock Springs Capital Management first reported a position in Spark Therapeutics, Inc. Common Stock in Q1 2015 and held it in 19 quarters.
Rock Springs Capital Management's Spark Therapeutics, Inc. Common Stock position peaked at $61.2M in Q1 2019.
0 funds tracked by Wall St. Rank held Spark Therapeutics, Inc. Common Stock as of Q4 2019.

Based on Rock Springs Capital Management's 13F filing for Q4 2019, filed 14 Feb 2020.