Eventide Asset Management’s Spark Therapeutics, Inc. Common Stock ONCE Stock Holding History

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2018 Q2	–	Sell	-270,000	Closed	-$18M	–	154
2018 Q1	$18M	Sell	270,000 -54,000	-17%	-$3.12M	0.84%	42
2017 Q4	$16.7M	Hold	324,000	–	–	0.87%	44
2017 Q3	$28.9M	Buy	324,000 +174,000	+116%	+$13.2M	1.64%	21
2017 Q2	$8.96M	Hold	150,000	–	–	0.56%	52
2017 Q1	$8M	Hold	150,000	–	–	0.53%	54
2016 Q4	$7.49M	Hold	150,000	–	–	0.49%	59
2016 Q3	$9.01M	Hold	150,000	–	–	0.55%	52
2016 Q2	$7.67M	Hold	150,000	–	–	0.47%	59
2016 Q1	$4.43M	Hold	150,000	–	–	0.25%	81
2015 Q4	$6.8M	Buy	150,000 +101,000	+206%	+$5.29M	0.34%	71
2015 Q3	$2.04M	Buy	49,000 +10,800	+28%	+$564K	0.12%	99
2015 Q2	$2.3M	Buy	+38,200	New	+$2.53M	0.12%	95