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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)
December 30, 20165.290.69
December 15, 20166.040.79
November 30, 20165.370.71
November 15, 20166.380.84
October 31, 20166.250.82
October 14, 20165.980.78
September 30, 20165.960.78
September 15, 20166.130.80
August 31, 20165.940.78
August 15, 20165.470.72
July 29, 20164.750.62
July 15, 20164.540.60
June 30, 20163.820.50
June 15, 20166.510.85
May 31, 20166.950.91
May 13, 20166.440.85
April 29, 201660.79
April 15, 20166.780.89
March 31, 20166.950.91
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)
December 31, 201675.3817.88
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)
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 Director324,9711.37%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 MatsuokaSee Remarks12,412less 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 Plus1,040,1352016-09-304.390.033,308
Federated Global Inv Mgmt Corp   Premium Plus558,9692016-09-302.360.021,778
Baker Bros Advisors Llc   Premium Plus2,335,1252015-12-319.87N/A22,954
Vanguard Group Inc   Premium Plus464,0002016-09-301.96N/A1,476
BlackRock Fund Advisors   Premium Plus360,9642016-09-301.52N/A1,148
BlackRock Advisors LLC   Premium Plus231,8132016-09-300.98N/A737
TIVERTON ASSET MANAGEMENT LLC   Premium Plus213,7482016-09-300.900.05680
Fidelity Management and Research Company   Premium Plus3,557,7792016-09-3015.00N/A11,314
TANG CAPITAL MANAGEMENT LLC   Premium Plus279,4252016-09-301.180.37889
Rock Springs Capital Management LP   Premium Plus433,5002016-09-301.830.091,379
Polaris Venture Management Co. V,LLC   Premium Plus1,827,9922016-09-307.716.145,813
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 Fund562,1072016-11-302.37N/A1,743
Federated Kaufmann Fund370,9962016-09-301.560.021,180
Fidelity® Select Biotechnology Portfolio201,8202016-11-300.850.01626
Vanguard Total Stock Mkt Idx200,9682016-12-310.85N/A432
BlackRock Small Cap Growth Equity Port168,7762016-12-310.710.05363
Fidelity® Series Growth Company Fund166,9742016-11-300.70N/A518

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