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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 (%)Short Interest (Shares in Mil)
September 29, 201731.076.77
September 15, 201743.439.46
August 31, 201744.489.69
August 15, 201742.279.21
July 31, 201740.058.72
July 14, 201737.528.17
June 30, 201738.628.41
June 15, 201738.398.36
May 31, 201738.68.41
May 15, 201737.598.19
April 28, 201737.238.11
April 13, 201736.327.91
March 31, 201737.868.25
March 15, 201738.318.34
February 28, 201749.628.65
February 15, 201748.588.46
January 31, 201747.028.19
January 13, 201745.837.99
December 30, 201645.827.98
December 15, 201649.168.57
November 30, 201649.338.60
November 15, 201652.389.13
October 31, 201650.718.84
October 14, 201651.739.01
September 30, 201648.538.46
September 15, 201651.528.98
August 31, 201646.928.18
August 15, 201647.858.34
July 29, 201646.728.14
July 15, 201645.37.89
June 30, 201642.587.42
June 15, 201640.827.11
May 31, 201641.067.16
May 13, 201641.477.23
April 29, 201640.847.12
April 15, 201642.697.44
March 31, 201647.78.31
March 15, 201648.448.44
February 29, 201641.118.14
February 12, 201643.948.70
January 29, 201639.137.75
January 15, 201639.817.89
December 31, 201536.477.22
December 15, 201536.367.20
November 30, 201535.387.01
November 13, 201534.756.88
October 30, 201533.656.67
October 15, 201535.547.04
September 30, 201536.47.21
September 15, 201536.937.32
August 31, 201533.466.63
August 14, 201531.626.26
July 31, 201530.696.08
July 15, 201530.846.11
June 30, 201530.836.11
June 15, 201532.46.42
May 29, 201532.236.38
May 15, 201530.976.14
April 30, 201530.486.04
April 15, 201527.935.53
March 31, 201528.395.62
March 13, 201525.945.25
February 27, 201526.395.34
February 13, 201522.264.50
January 30, 201522.674.59
January 15, 201522.724.60
December 31, 201422.344.52
December 15, 201425.185.10
November 28, 201424.234.90
November 14, 201421.954.44
October 31, 201421.084.27
October 15, 201421.174.29
September 30, 201418.043.65
September 15, 201414.172.87
August 29, 201413.592.75
August 15, 201412.772.59
July 31, 201412.862.60
July 15, 201414.262.89
June 30, 201412.212.47
June 13, 201411.732.37
May 30, 201410.312.09
May 15, 201411.222.27
April 30, 20149.81.98
April 15, 20149.211.86
March 31, 201412.42.51
March 14, 201418.621.98
February 28, 201418.491.97
February 14, 201418.721.99
January 31, 201418.641.99
January 15, 201419.572.09
December 31, 201311.911.27
December 13, 201313.151.40
November 29, 201313.31.42
November 15, 201313.921.48
October 31, 201314.091.50
October 15, 201314.221.52
September 30, 201314.271.52
September 13, 201311.081.18
August 30, 201311.211.19
August 15, 201310.421.11
July 31, 20139.861.05
July 15, 201311.231.20
June 28, 20138.740.93
June 14, 201310.191.09
May 31, 201311.021.17
May 15, 201313.81.47
April 30, 201312.41.32
April 15, 201311.921.27
March 28, 20139.330.99
March 15, 20139.580.98
February 28, 20138.70.89
February 15, 20138.740.90
January 31, 20138.930.92
January 15, 20139.450.97
December 31, 20127.720.79
December 14, 20127.140.73
November 30, 20126.20.64
November 15, 20125.250.54
October 31, 20124.010.41
October 15, 20124.160.43
September 28, 20123.110.32
September 14, 20122.930.30
August 31, 20123.420.35
August 15, 20122.420.25
July 31, 20120.870.09
July 13, 20120.040.00

Institutional Ownership History (%)

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

Date Institutional Ownership (%)Institutional Ownership (Shares in Mil)
June 30, 201699.9846.02
September 30, 201495.5734.46
June 30, 201490.932.76
March 31, 201489.7632.29
December 31, 20138427.50
September 30, 201390.6229.66
June 30, 201383.5127.24
March 31, 201389.1629.05
December 31, 201267.6218.35
September 30, 201285.3723.27
June 30, 201234.612.51

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 (%)Insider Ownership (Shares in Mil)
June 30, 20173.381.82
May 31, 20173.381.82
April 30, 20173.381.82
March 31, 20173.391.82
February 28, 20174.392.34
January 31, 20174.392.34
December 31, 20164.542.35
November 30, 20164.542.35
October 31, 20164.562.34
September 30, 20164.562.34
August 31, 20164.562.34
July 31, 20165.112.34
June 30, 20165.112.34
May 31, 20165.12.34
April 30, 20165.82.34
March 31, 20164.721.90
February 29, 20164.741.90
January 31, 20164.741.90
December 31, 20154.721.90
November 30, 20154.741.90
October 31, 20154.741.90
September 30, 20154.751.90
August 31, 20154.741.90
July 31, 20154.741.90
June 30, 20154.741.90
May 31, 20154.741.90
April 30, 20154.731.89
March 31, 20155.241.89
February 28, 20155.241.89
January 31, 20155.241.89
December 31, 20145.211.88
November 30, 20145.241.89
October 31, 20145.241.89
September 30, 20145.241.89
August 31, 20145.241.89
July 31, 20145.241.89
June 30, 20145.251.89
May 31, 20145.251.89

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Leon O. Moulder,JrN/A1,018,8281.88%2017-03-01
Jack KhattarN/A444,1240.82%2016-03-29
Richard J. RodgersN/A257,1410.47%2012-07-03
Mr. Lawrence (Larry) M. AllevaN/A27,834less than 0.1%2016-06-01
Dr. Beth C. Seidenberg,M.D.N/A21,657less than 0.1%2016-06-01
Mr. David M. MottN/A12,149less than 0.1%2016-06-01
Dr. Mary Lynne Hedley,PhDPresident & COO6,073less than 0.1%2017-03-01
Mr. Orlando OliveiraSVP & GM, International5,376less than 0.1%2017-03-01
Mr. Martin H. Huber, JrSVP & Cheif Medical Officer4,772less than 0.1%2017-03-01
Mr. Paul WalkerN/A4,041less than 0.1%2014-06-02

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value($1000)
NEA Management Company, LLC   Premium Plus10,275,1132017-06-3052.290.191,437,077
WELLINGTON MANAGEMENT GROUP LLP   Premium Plus5,147,6852017-06-300.170.10719,955
PRICE T ROWE ASSOCIATES INC /MD/   Premium Plus4,814,7352017-06-300.120.09673,389
BlackRock Inc.   Premium Plus3,605,2472017-06-300.030.07504,230
VANGUARD GROUP INC   Premium Plus2,978,2362017-06-300.020.05416,537
INTERWEST VENTURE MANAGEMENT CO   Premium Plus2,021,7382017-09-3067.96N/A261,007
FRANKLIN RESOURCES INC   Premium Plus1,875,4222017-06-300.130.03262,301
STATE STREET CORP   Premium Plus1,168,9132017-06-300.010.02163,496
ORACLE INVESTMENT MANAGEMENT INC   Premium Plus1,052,5792017-06-3029.580.02147,214
Fairholme Focused Income Fund Premium1,027,0352017-06-300.310.02143,641
Chou RRSP Fund Premium1,027,0352017-06-300.310.02143,641
Matthews Japan Fund Premium1,027,0352017-06-300.310.02143,641
Meryl Witmer Premium1,027,0352017-06-300.310.02143,641
Eaton Vance Worldwide Health Sciences Fund Premium1,027,0352017-06-300.310.02143,641
Leith Wheeler Canadian Equity Premium1,027,0352017-06-300.310.02143,641
Invesco European Growth Fund Premium1,027,0352017-06-300.310.02143,641
Causeway International Value Premium1,027,0352017-06-300.310.02143,641
David Williams Premium1,027,0352017-06-300.310.02143,641
Signature Select Canadian Fund Premium1,027,0352017-06-300.310.02143,641
Wintergreen Fund Premium1,027,0352017-06-300.310.02143,641
Charles de Vaulx Premium1,027,0352017-06-300.310.02143,641
azValor Iberia FI Premium1,027,0352017-06-300.310.02143,641
Yacktman Focused Fund Premium1,027,0352017-06-300.310.02143,641
David Herro Premium1,027,0352017-06-300.310.02143,641
Hennessy Japan Small Cap Fund Premium1,027,0352017-06-300.310.02143,641
Value Partners Premium1,027,0352017-06-300.310.02143,641
David Carlson Premium1,027,0352017-06-300.310.02143,641
Vanguard Health Care Fund Premium1,027,0352017-06-300.310.02143,641
Mawer Canadian Equity Fund Premium1,027,0352017-06-300.310.02143,641
Oakmark Intl Small Cap Premium1,027,0352017-06-300.310.02143,641
Wasatch International Growth Premium1,027,0352017-06-300.310.02143,641
Francisco García Paramés Premium1,027,0352017-06-300.310.02143,641
Steven Romick Premium1,027,0352017-06-300.310.02143,641
CI Can Am Small Cap Premium1,027,0352017-06-300.310.02143,641
IVA International Fund Premium1,027,0352017-06-300.310.02143,641
Bestinfond Premium1,027,0352017-06-300.310.02143,641
David Nadel Premium1,027,0352017-06-300.310.02143,641
Yacktman Fund Premium1,027,0352017-06-300.310.02143,641
Tweedy Browne Global Value Premium1,027,0352017-06-300.310.02143,641
Hennessy Japan Fund Premium1,027,0352017-06-300.310.02143,641
Matthews China Fund Premium1,027,0352017-06-300.310.02143,641
Jerome Dodson Premium1,027,0352017-06-300.310.02143,641
FPA Capital Fund Premium1,027,0352017-06-300.310.02143,641
Mawer New Canada Fund Premium1,027,0352017-06-300.310.02143,641
Bernard Horn Premium1,027,0352017-06-300.310.02143,641
MS Global Franchise Fund Premium1,027,0352017-06-300.310.02143,641
Spiros Segalas Premium1,027,0352017-06-300.310.02143,641
BB BIOTECH AG   Premium Plus877,9902017-06-303.750.02122,796
Bank of New York Mellon Corp   Premium Plus703,7742017-06-300.030.0198,430
Ameriprise Financial Inc   Premium Plus641,4662017-06-300.050.0189,716
PointState Capital LP   Premium Plus614,6952017-06-300.940.0185,971
Rock Springs Capital Management LP   Premium Plus490,5002017-06-303.500.0168,601
ORACLE INVESTMENT MANAGEMENT INC   Premium Plus476,4002017-06-300.160.01814
GOLDMAN SACHS GROUP INC   Premium Plus461,9322017-06-300.020.0164,606
SUSQUEHANNA INTERNATIONAL GROUP, LLP   Premium Plus455,5002017-06-300.030.0163,706
venBio Select Advisor LLC   Premium Plus400,4032017-06-307.100.0156,000
PICTET ASSET MANAGEMENT LTD   Premium Plus399,1052017-06-300.180.0159,590

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