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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
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
November 30, 201496
September 30, 201499
August 31, 201498
March 31, 201488
February 28, 201498
January 31, 201498
December 31, 201389
November 30, 201397
October 31, 201397
September 30, 201392
August 31, 201392
July 31, 201392
June 30, 201390
May 31, 201388
April 30, 201389
March 31, 201352
February 28, 201387
January 31, 201387
August 31, 201271
July 31, 201271
May 31, 201263
April 30, 201263

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
January 31, 20155
December 31, 20145
November 30, 20145
October 31, 20145
September 30, 20145
August 31, 20145
July 31, 20145
June 30, 20145
May 31, 20145

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Leon O. Moulder,JrCEO1,006,4282.79%2012-08-30
Dr. Mary Lynne Hedley,PhDN/A563,5691.56%2012-07-03
Richard J. RodgersN/A257,1410.71%2012-07-03
Mr. Lawrence (Larry) M. AllevaDirector25,285less than 0.1%2014-09-29
Dr. Beth C. Seidenberg,M.D.Director15,565less than 0.1%2014-06-02
Dr. Arnold L. Oronsky,PhDDirector, 10% Owner9,093less than 0.1%2015-01-12
David MottDirector, 10% Owner8,677less than 0.1%2014-06-02
Mr. Paul WalkerN/A4,041less than 0.1%2014-06-02
Mr. Patrick J. Kerins10% Owner829less than 0.1%2013-06-04

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value
NEA Management Company, LLC9,854,2552014-12-3127.2917.77366,480,000
Wellington Management Company LLP5,022,3232014-12-3113.910.05186,780,000
T. Rowe Price Associates, Inc.2,530,5392014-12-317.010.0294,111,000
InterWest Management Partners X LLC1,871,7012015-01-125.180.0069,608,560
AllianceBernstein LP1,346,4992014-12-313.730.0450,076,000
Orbimed Advisors, LLC1,330,0002014-12-313.680.4749,463,000
Fidelity Management and Research Company1,225,8942014-12-313.390.0145,591,000
T. Rowe Price Health Sciences Fund1,131,8382014-12-313.130.3642,093,055
Fidelity® Select Biotechnology Portfolio1,072,1152015-01-312.970.3543,131,186
Healthcor Management, L.p.1,050,0002014-12-312.912.1839,050,000

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