BlackRock Advisors’s Spark Therapeutics, Inc. Common Stock ONCE Stock Holding History

BlackRock Advisors’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
2016 Q4	$6.34M	Buy	127,069 +26,374	+26%	+$1.41M	0.01%	1049
2016 Q3	$6.05M	Buy	100,695 +91,287	+970%	+$5.26M	0.01%	1057
2016 Q2	$481K	Buy	9,408 +4,618	+96%	+$197K	﹤0.01%	2140
2016 Q1	$141K	Buy	4,790 +511	+12%	+$16.1K	﹤0.01%	2742
2015 Q4	$194K	Sell	4,279 -151,084	-97%	-$7.92M	﹤0.01%	2588
2015 Q3	$6.48M	Sell	155,363 -162,014	-51%	-$8.45M	0.01%	988
2015 Q2	$19.1M	Sell	317,377 -124,867	-28%	-$8.26M	0.02%	537
2015 Q1	$34.3M	Buy	+442,244	New	+$25.5M	0.04%	399

Other funds holding ONCE

Fidelity Investments Boston, Massachusetts $2.3T AUM 54.33% 1-Year Est. Return

T. Rowe Price Associates Baltimore, Maryland $999B AUM 46.22% 1-Year Est. Return

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

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

Federated Hermes Pittsburgh, Pennsylvania $69.6B AUM 42.52% 1-Year Est. Return

BBA

Baker Bros. Advisors New York $20B AUM 154.41% 1-Year Est. Return

Millennium Management New York $276B AUM 44.8% 1-Year Est. Return

BFA

BlackRock Fund Advisors San Francisco, California $542B AUM 18.13% 1-Year Est. Return

SMV

Sofinnova Management VIII Menlo Park, California $183M AUM 4.18% 1-Year Est. Return

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

BlackRock Advisors's ONCE Position: Q4 2016 in Review

BlackRock Advisors increased its Spark Therapeutics, Inc. Common Stock (ONCE) stake by 26% in Q4 2016, buying an estimated $1.41M and bringing the position to 127,069 shares worth $6.34M. The position accounts for 0.01% of the portfolio, ranked #1049.

BlackRock Advisors first reported a position in ONCE in Q1 2015 and has held it in 8 quarters since. The position peaked at $34.3M in Q1 2015. 119 funds tracked by Wall St. Rank hold ONCE as of Q4 2016.

BlackRock Advisors held 127,069 shares of Spark Therapeutics, Inc. Common Stock worth $6.34M as of Q4 2016.
BlackRock Advisors bought 26,374 Spark Therapeutics, Inc. Common Stock shares in Q4 2016, an estimated $1.41M.
Spark Therapeutics, Inc. Common Stock made up 0.01% of BlackRock Advisors's portfolio in Q4 2016, its #1049 holding.
BlackRock Advisors first reported a position in Spark Therapeutics, Inc. Common Stock in Q1 2015 and has held it in 8 quarters since.
BlackRock Advisors's Spark Therapeutics, Inc. Common Stock position peaked at $34.3M in Q1 2015.
119 funds tracked by Wall St. Rank held Spark Therapeutics, Inc. Common Stock as of Q4 2016.

Based on BlackRock Advisors's 13F filing for Q4 2016, filed 10 Feb 2017.