Rock Springs Capital Management’s aTyr Pharma ATYR Stock Holding History

Rock Springs Capital Management’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 Q1	–	Sell	-33,929	Closed	-$1.66M	–	158
2017 Q4	$1.66M	Hold	33,929	–	–	0.08%	137
2017 Q3	$2.4M	Hold	33,929	–	–	0.11%	127
2017 Q2	$1.61M	Hold	33,929	–	–	0.08%	134
2017 Q1	$1.66M	Hold	33,929	–	–	0.1%	126
2016 Q4	$1.02M	Buy	33,929 +2,965	+10%	+$122K	0.07%	126
2016 Q3	$1.38M	Hold	30,964	–	–	0.09%	128
2016 Q2	$1.21M	Hold	30,964	–	–	0.09%	129
2016 Q1	$1.71M	Buy	30,964 +1,307	+4%	+$99.4K	0.14%	116
2015 Q4	$4.08M	Buy	29,657 +1,872	+7%	+$266K	0.31%	96
2015 Q3	$3.99M	Sell	27,785 -1,393	-5%	-$318K	0.32%	93
2015 Q2	$7.57M	Buy	+29,178	New	+$9.06M	0.55%	68

Other funds holding ATYR

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

EcoR1 Capital San Francisco, California $2.36B AUM 204.53% 1-Year Est. Return

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

Sofinnova Investments Menlo Park, California $2.63B AUM 117.41% 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

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

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

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

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

Rock Springs Capital Management's ATYR Position: Q1 2018 in Review

Rock Springs Capital Management sold out of aTyr Pharma (ATYR) in Q1 2018, closing a stake of 33,929 shares — an estimated $1.66M sold.

Rock Springs Capital Management first reported a position in ATYR in Q2 2015 and held it in 11 quarters. The position peaked at $7.57M in Q2 2015. 35 funds tracked by Wall St. Rank hold ATYR as of Q1 2018.

Rock Springs Capital Management reported no remaining aTyr Pharma position as of Q1 2018 after selling out during the quarter.
Rock Springs Capital Management sold 33,929 aTyr Pharma shares in Q1 2018, an estimated $1.66M.
Rock Springs Capital Management first reported a position in aTyr Pharma in Q2 2015 and held it in 11 quarters.
Rock Springs Capital Management's aTyr Pharma position peaked at $7.57M in Q2 2015.
35 funds tracked by Wall St. Rank held aTyr Pharma as of Q1 2018.

Based on Rock Springs Capital Management's 13F filing for Q1 2018, filed 15 May 2018.