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Tesaro Inc (TSRO) Ownership Data

Short Interest History (%)

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

Date Short Interest
January 29, 201639.13
January 15, 201639.81
December 31, 201536.47
December 15, 201536.36
November 30, 201535.38
November 13, 201534.75
October 30, 201533.65
October 15, 201535.54
September 30, 201536.4
September 15, 201536.93
August 31, 201533.46
August 14, 201531.62
July 31, 201530.69
July 15, 201530.84
June 30, 201530.83
June 15, 201532.4
May 29, 201532.23
May 15, 201530.97
April 30, 201530.48
April 15, 201527.93
March 31, 201528.39
March 13, 201525.94
February 27, 201526.39
February 13, 201522.26
January 30, 201522.67
January 15, 201522.72
December 31, 201422.34
December 15, 201425.18
November 28, 201424.23
November 14, 201421.95
October 31, 201421.08
October 15, 201421.17
September 30, 201418.04
September 15, 201414.17
August 29, 201413.59
August 15, 201412.77
July 31, 201412.86
July 15, 201414.26
June 30, 201412.21
June 13, 201411.73
May 30, 201410.31
May 15, 201411.22
April 30, 20149.8
April 15, 20149.21
March 31, 201412.4
March 14, 201418.62
February 28, 201418.49
February 14, 201418.72
January 31, 201418.64
January 15, 201419.57
December 31, 201311.91
December 13, 201313.15
November 29, 201313.3
November 15, 201313.92
October 31, 201314.09
October 15, 201314.22
September 30, 201314.27
September 13, 201311.08
August 30, 201311.21
August 15, 201310.42
July 31, 20139.86
July 15, 201311.23
June 28, 20138.74
June 14, 201310.19
May 31, 201311.02
May 15, 201313.8
April 30, 201312.4
April 15, 201311.92
March 28, 20139.33
March 15, 20139.58
February 28, 20138.7
February 15, 20138.74
January 31, 20138.93
January 15, 20139.45
December 31, 20127.72
December 14, 20127.14
November 30, 20126.2
November 15, 20125.25
October 31, 20124.01
October 15, 20124.16
September 28, 20123.11
September 14, 20122.93
August 31, 20123.42
August 15, 20122.42
July 31, 20120.87
July 13, 20120.04

Institutional Ownership History (%)

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

Date Institutional Ownership
September 30, 201495.57
June 30, 201490.89
March 31, 201489.75
December 31, 201384.05
September 30, 201390.66
June 30, 201383.51
March 31, 201389.16
December 31, 201267.65
September 30, 201285.37
June 30, 201234.61

Insider ownership (%)

This is the historical insider ownership of Tesaro 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
December 31, 20154.71
November 30, 20154.74
October 31, 20154.74
September 30, 20154.75
August 31, 20154.74
July 31, 20154.74
June 30, 20154.74
May 31, 20154.74
April 30, 20154.73
March 31, 20155.24
February 28, 20155.24
January 31, 20155.24
December 31, 20145.21
November 30, 20145.24
October 31, 20145.24
September 30, 20145.24
August 31, 20145.24
July 31, 20145.24
June 30, 20145.25
May 31, 20145.25

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Leon O. Moulder,JrCEO1,006,4282.51%2012-08-30
Dr. Mary Lynne Hedley,PhDN/A563,5691.41%2012-07-03
Richard J. RodgersN/A257,1410.64%2012-07-03
Mr. Lawrence (Larry) M. AllevaDirector26,354less than 0.1%2015-06-01
Dr. Beth C. Seidenberg,M.D.Director20,073less than 0.1%2015-09-17
Dr. Arnold L. Oronsky,PhDDirector, 10% Owner10,096less than 0.1%2015-06-01
David MottDirector, 10% Owner10,034less than 0.1%2015-06-01
Mr. Paul WalkerN/A4,041less than 0.1%2014-06-02
Mr. Patrick J. Kerins10% Owner1,333less than 0.1%2015-06-01
Ryan D. Drant10% Owner353less than 0.1%2015-06-01

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value($1000)
New Enterprise Associates, LLC8,856,3842015-06-0122.14N/A520,401
NEA Management Company, LLC   Premium Plus8,854,2552015-12-3122.0929.47463,255
Fidelity Management and Research Company   Premium Plus5,581,7932015-09-3017.890.04287,518
T. Rowe Price Associates, Inc.   Premium Plus3,514,8382015-09-3011.270.04181,049
Wellington Management Group, LLP   Premium Plus3,495,8472015-04-308.74N/A190,419
Wellington Management Company LLP   Premium Plus3,215,5532015-09-3010.310.05165,633
BlackRock Advisors LLC   Premium Plus2,620,9802015-12-316.54N/A137,130
Fidelity® Select Biotechnology Portfolio2,149,8492015-12-315.360.75112,480
Perceptive Advisors LLC   Premium Plus1,963,5182015-09-306.293.53101,141
Vanguard Group Inc   Premium Plus1,884,9322015-09-306.040.0197,093

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