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aTyr Pharma Inc (LIFE) Ownership Data

Short Interest History (%)

This is the historical short interest of aTyr Pharma Inc, as measured by the Short Percentage Of Float.

Date Short Interest (%)Short Interest (Shares in Mil)
April 28, 20174.190.55
April 13, 20174.120.55
March 31, 20174.370.58
March 15, 20174.470.59
February 28, 20174.70.65
February 15, 20175.140.71
January 31, 20175.360.74
January 13, 20174.260.59
December 30, 201650.69
December 15, 20165.710.79
November 30, 20165.080.71
November 15, 20166.040.84
October 31, 20165.920.82
October 14, 20165.660.78
September 30, 20165.640.78
September 15, 20165.80.80
August 31, 20165.620.78
August 15, 20165.180.72
July 29, 20164.490.62
July 15, 20164.290.60
June 30, 20163.610.50
June 15, 20166.160.85
May 31, 20166.580.91
May 13, 20166.090.85
April 29, 20165.680.79
April 15, 20166.410.89
March 31, 20166.570.91
March 15, 20165.480.83
February 29, 20166.050.92
February 12, 20164.960.75
January 29, 20164.560.69
January 15, 20165.820.89
December 31, 20155.60.85
December 15, 20154.640.71
November 30, 20154.910.75
November 13, 20155.230.80
October 30, 20156.921.05
October 15, 20157.761.18
September 30, 20157.211.10
September 15, 20156.91.05
August 31, 20156.240.95
August 14, 20155.970.91
July 31, 20155.480.83
July 15, 20154.940.75
June 30, 20152.70.41
June 15, 20151.480.22
May 29, 20150.780.12
May 15, 20150.540.08

Institutional Ownership History (%)

This the Institutional Ownership History of aTyr Pharma IncPeter Lynch prefers to buy companies with low institutional ownership.

Date Institutional Ownership (%)Institutional Ownership (Shares in Mil)
March 31, 201747.2611.24
December 31, 201643.0310.22
September 30, 201642.9110.18
June 30, 201642.8810.17
March 31, 201660.9714.44
December 31, 201573.7517.46
September 30, 201562.8314.89
June 30, 201559.9316.08

Insider ownership (%)

This is the historical insider ownership of aTyr Pharma Inc. It is usually better to buy companies with large insider ownership. The company insiders' interest are more aligned with external shareholders in this case.

Date Insider Ownership (%)Insider Ownership (Shares in Mil)
April 30, 20172.580.61
March 31, 20172.580.61
February 28, 20172.580.61
January 31, 20172.580.61
December 31, 20162.280.54
November 30, 20162.280.54
October 31, 20162.280.54
September 30, 20162.280.54
August 31, 20162.280.54
July 31, 20162.280.54
June 30, 20162.280.54
May 31, 20162.230.53
April 30, 20162.420.57
March 31, 20162.020.48
February 29, 20162.030.48
January 31, 20162.030.48
December 31, 20152.030.48
November 30, 20152.030.48
October 31, 20152.030.48
September 30, 20152.030.48
August 31, 20152.030.48
July 31, 20152.030.48
June 30, 20152.030.48
May 31, 20152.030.48
April 30, 20151.590.36

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Dr. John D. Mendlein, PhDCEO and Director324,9711.36%2016-12-19
John K. ClarkeN/A104,8780.44%2015-05-12
Dr. Melissa A. Ashlock, M.D.N/A68,1640.29%2015-05-06
Dr. Paul R. Schimmel,PhDDirector40,4400.17%2016-12-20
Mr. Frederic ChereauN/A12,867less than 0.1%2015-05-06
Kathryn E. FalbergN/A12,572less than 0.1%2015-05-06
Mr. Amir H. NashatN/A12,572less than 0.1%2015-05-12
Mr. Grove MatsuokaN/A12,412less than 0.1%2016-05-09
Mr. Amanullah AshrafVice President, Manufacturing11,000less than 0.1%2016-12-20
Dr. David M. Weiner, M.D.N/A5,028less than 0.1%2015-05-06

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value($1000)
Alyeska Investment Group, L.P.   Premium Plus1,072,1082016-12-314.520.022,305
Magnetar Financial LLC   Premium Plus138,4592016-12-310.58N/A298
Federated Global Inv Mgmt Corp   Premium Plus558,9692016-09-302.360.021,778
Vanguard Group Inc   Premium Plus356,7452016-12-311.50N/A767
BlackRock Fund Advisors   Premium Plus371,0572016-12-311.56N/A798
BlackRock Advisors LLC   Premium Plus211,3562016-12-310.89N/A454
Fidelity Management and Research Company   Premium Plus3,557,7792016-12-3114.98N/A7,649
TANG CAPITAL MANAGEMENT LLC   Premium Plus279,4252016-12-311.180.32601
Rock Springs Capital Management LP   Premium Plus475,0002016-12-312.000.071,021
Polaris Venture Management Co. V,LLC   Premium Plus1,827,9922016-09-307.716.145,813
EcoR1 Capital, LLC   Premium Plus1,961,3352017-01-188.26N/A4,217
One Palmer Square Associates V, L.L.C.1,827,5202015-12-317.72N/A17,965
Alta Partners Management VIII, LLC1,778,0642015-12-317.51N/A17,478
CHP II Management LLC1,758,1582015-12-317.43N/A17,283
Fidelity® Growth Company Fund528,6072017-01-312.23N/A1,744
Fidelity® Select Biotechnology Portfolio201,8202017-01-310.850.01666
Vanguard Total Stock Mkt Idx200,9682017-02-280.85N/A804
Vanguard Extended Market Index Fund184,8372017-02-280.78N/A739
Fidelity® Series Growth Company Fund166,9742017-01-310.700.01551
BlackRock Small Cap Growth Equity Port162,0162017-01-310.680.07535

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