EcoR1 Capital’s aTyr Pharma ATYR Stock Holding History

EcoR1 Capital’s Portfolio ATYR Stock Details ATYR Fund Activity

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2018 Q2	–	Sell	-279,855	Closed	-$10.6M	–	43
2018 Q1	$10.6M	Hold	279,855	–	–	1.06%	21
2017 Q4	$13.7M	Sell	279,855 -1,206	-0.4%	-$74.2K	1.54%	16
2017 Q3	$19.9M	Buy	281,061 +117,300	+72%	+$5.43M	2.65%	10
2017 Q2	$7.79M	Hold	163,761	–	–	1.38%	17
2017 Q1	$8.02M	Buy	163,761 +93,976	+135%	+$4.3M	2.03%	13
2016 Q4	$2.1M	Buy	+69,785	New	+$2.86M	0.67%	20
2016 Q2	–	Sell	-5,354	Closed	-$295K	–	37
2016 Q1	$295K	Sell	5,354 -51,108	-91%	-$3.88M	0.1%	35
2015 Q4	$7.77M	Sell	56,462 -3,571	-6%	-$508K	2.44%	17
2015 Q3	$8.62M	Buy	60,033 +257	+0.4%	+$58.6K	3.92%	10
2015 Q2	$15.5M	Buy	+59,776	New	+$18.6M	5.17%	8

Other funds holding ATYR

Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return

Redmile Group San Francisco, California $1.51B AUM 164.17% 1-Year Est. Return

PVMCV

Polaris Venture Management Co V Boston, Massachusetts $14.1M AUM 121.41% 1-Year Est. Return

Viking Global Investors Stamford, Connecticut $35.7B AUM 21.3% 1-Year Est. Return

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

Alyeska Investment Group Chicago, Illinois $35.4B AUM 33.54% 1-Year Est. Return

Renaissance Technologies New York $63.9B AUM 45.56% 1-Year Est. Return

Artal Group Luxembourg $1.01B AUM 29.84% 1-Year Est. Return

BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return

GHCM

Glen Harbor Capital Management San Diego, California $4.82B AUM 4.69% 1-Year Est. Return

EcoR1 Capital's ATYR Position: Q2 2018 in Review

EcoR1 Capital sold out of aTyr Pharma (ATYR) in Q2 2018, closing a stake of 279,855 shares — an estimated $10.6M sold.

EcoR1 Capital first reported a position in ATYR in Q2 2015 and held it in 10 quarters. The position peaked at $19.9M in Q3 2017. 33 funds tracked by Wall St. Rank hold ATYR as of Q2 2018.

EcoR1 Capital reported no remaining aTyr Pharma position as of Q2 2018 after selling out during the quarter.
EcoR1 Capital sold 279,855 aTyr Pharma shares in Q2 2018, an estimated $10.6M.
EcoR1 Capital first reported a position in aTyr Pharma in Q2 2015 and held it in 10 quarters.
EcoR1 Capital's aTyr Pharma position peaked at $19.9M in Q3 2017.
33 funds tracked by Wall St. Rank held aTyr Pharma as of Q2 2018.

Based on EcoR1 Capital's 13F filing for Q2 2018, filed 14 Aug 2018.