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Mast Therapeutics Inc (MSTX)Ownership Data

Short Interest History (%)

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

Date Short Interest
March 13, 20154.34
February 27, 20154.84
February 13, 20154.57
January 30, 20154.56
January 15, 20154.63
December 31, 20144.8
December 15, 20144.76
November 28, 20144.86
November 14, 20144.86
October 31, 20148.01
October 15, 20148.42
September 30, 20148.42
September 15, 20148.03
August 29, 20147.71
August 15, 20147.72
July 31, 20148.2
July 15, 20148.42
June 30, 20148.34
June 13, 20148.06
May 30, 20148.47
May 15, 20148.7
April 30, 20149.28
April 15, 201419.72
March 31, 201418.97
March 14, 201418.76
February 28, 201420.17
February 14, 201419.38
January 31, 201419.92
January 15, 201413.56
December 31, 201312.12
December 13, 201311.69
November 29, 201311.68
November 15, 201312.55
October 31, 201310.79
October 15, 201310.52
September 30, 201310.6
September 13, 201310.16
August 30, 201310.05
August 15, 20139.92
July 31, 20139.5
July 15, 20138.97
June 28, 20138.45
June 14, 20139.51
May 31, 20139.4
May 15, 20139.33
April 30, 20139.3
April 15, 20139.03
March 28, 20138.81
March 15, 20138.94
February 15, 20139.14
January 31, 20138.47
January 15, 20138.15
December 31, 20128.22
December 14, 20128.34
November 30, 20128.43
November 15, 20128.34
October 31, 20128.11
October 15, 20127.73
September 28, 20128.06
September 14, 20127.13
August 31, 20127.09
August 15, 20127.03
July 31, 20126.8
July 13, 20125.96
June 29, 20126.03
June 15, 20126
May 31, 20126.28
May 15, 20126.22
April 30, 20126.14
April 13, 20126.13
March 30, 201210.72
March 15, 201210.46
February 29, 201210.14
February 15, 201210.26
January 31, 20129.72
January 13, 20129.35
December 30, 20119.34
December 15, 20119.45
November 30, 201110.29
November 15, 20119.95
October 31, 20116.36
October 14, 20116.87
September 30, 20116.64
September 15, 20116.75
August 31, 20115.71
August 15, 20115.46
July 29, 20118.52
July 15, 20119.02
June 30, 20117.73
June 15, 20115.9
May 31, 20115.65
May 13, 20115.51
April 29, 20114.62
April 15, 20114.23
March 31, 20117.67
March 15, 20115.99
February 28, 20116.03
February 15, 20115.65
January 31, 20115.98
January 14, 20115.78
December 31, 20104.96
December 15, 20103.71
November 30, 20103.37
November 15, 20103.43
October 29, 20103.43
October 15, 20103.35
September 30, 20103.58
September 15, 20103.83
August 31, 20103.99
August 13, 20104.15
July 30, 20103.98
July 15, 20104.18
June 30, 20103.91
June 15, 20103.53
May 28, 20102.84
May 14, 20102.44
April 30, 20101.79
April 15, 20103.22
March 31, 20103.29
March 15, 20102.83
February 26, 20106.76
February 12, 20106.54
January 29, 20106.39
January 15, 20106.87
December 31, 20098.38
December 15, 20090.51
November 30, 20090.44
November 13, 20090.32
October 30, 20090.3
October 15, 20090.09
September 30, 20090.08
September 15, 20090.04
August 31, 20090.05
July 31, 20090.07
June 30, 20090.04
June 15, 20090.08
May 29, 20090.02
May 15, 20090.08
April 30, 20090.03
April 15, 20090.1
March 31, 20090.06
March 13, 20090.11
February 27, 20090.12
February 13, 20090.08
January 30, 20090.06
January 15, 20090.09
December 31, 20080.1
December 15, 20080.1
November 28, 20080.1
November 14, 20080.12
October 31, 20080.14
October 15, 20080.12
September 30, 20080.24
September 15, 20080.12
August 29, 20080.13
August 15, 20080.16
July 31, 20080.12
July 15, 20080.12
June 30, 20080.22
June 13, 20080.2
May 30, 20080.21
May 15, 20080.22
April 30, 20080.53
April 15, 20080.64
March 31, 20080.68
March 14, 20080.8
February 29, 20080.88
February 15, 20080.92
January 31, 20080.92
January 15, 20080.97
December 31, 20071.07
December 11, 20071.06
November 27, 20071.37
November 9, 20071.88
October 26, 20071.91
October 10, 20072.08
September 25, 20074.04
September 11, 20074.11
August 10, 20074.56
July 10, 20075.75
June 12, 20079.92
May 10, 20078.39
April 10, 20078.12
March 12, 20077.89
February 12, 20077.93
January 9, 20076.96
December 12, 20066.92
November 10, 20066.94
October 10, 20067.43
September 12, 20068.38
August 10, 20068.01
July 11, 20067.11
June 12, 20063.67
May 10, 20062.69
April 10, 20062.33
March 10, 20062.07
February 10, 20062.24
January 10, 20061.5
December 12, 20053.16
November 10, 20051.09
October 11, 20051.1
September 12, 20051.65
August 10, 20051.1
July 12, 20050.62
June 10, 20050.66
May 10, 20050.87
April 12, 20050.55
March 10, 20050.2
February 10, 20050.23
January 11, 20050.27
December 10, 20040.43
November 10, 20040.57
October 12, 20040.77
September 10, 20040.98
August 10, 20040.66
July 12, 20040.66
June 9, 20040.65
May 11, 20040.6

Institutional Ownership History (%)

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

Date Institutional Ownership
February 28, 201539
January 31, 201527
December 31, 201431
November 30, 201427
October 31, 201427
September 30, 201424
August 31, 201423
July 31, 201428
June 30, 201423
May 31, 201423
March 31, 201423
February 28, 201423
January 31, 201436
December 31, 201321
November 30, 201335
October 31, 201348
September 30, 201335
August 31, 201348
July 31, 201336
June 30, 201347
May 31, 201354
April 30, 201311
March 31, 201312
January 31, 201312
December 31, 201214
November 30, 201217
October 31, 201220
September 30, 201217
August 31, 201220
July 31, 201220
June 30, 201217
May 31, 201217
April 30, 201217
March 31, 201223
February 29, 201224
January 31, 201223
December 31, 201143
November 30, 201132
October 31, 201132
September 30, 201126
August 31, 201141
July 31, 201141
June 30, 201136
May 31, 201132
April 30, 201119
March 31, 201119
February 28, 201120
January 31, 201118
December 31, 20103
November 30, 20103
October 31, 20102
September 30, 20102
August 31, 20103
July 31, 201057
June 30, 201067
April 30, 20103
March 31, 20105
February 28, 20105
January 31, 20105
December 31, 20095
November 30, 20096
September 30, 200810
August 31, 200810
July 31, 200810
June 30, 200814
May 31, 200814
April 30, 200814
March 31, 200813
February 29, 200813
January 31, 200813

Insider ownership (%)

This is the historical insider ownership of Mast Therapeutics 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
February 28, 20155
January 31, 20155
December 31, 20145
November 30, 20145
October 31, 20145
September 30, 20146
August 31, 20146
March 31, 201326
January 31, 201326
November 30, 201227
October 31, 201227
September 30, 201227
August 31, 201227
July 31, 201227
June 30, 201227
May 31, 201227
April 30, 201227
March 31, 201227
February 29, 201227
January 31, 201227
December 31, 201127
November 30, 201127
October 31, 201127
September 30, 201127
August 31, 201127
July 31, 201127
June 30, 201127
May 31, 201127
April 30, 201130
March 31, 201127
February 28, 201144
January 31, 201144
December 31, 201044
November 30, 201044
October 31, 201044
September 30, 201044
August 31, 201044
July 31, 201063
June 30, 201063
May 31, 201063
April 30, 201063
March 31, 20103
February 28, 20104
January 31, 20104
December 31, 20094
November 30, 20094
October 31, 20095
September 30, 20095
August 31, 20095
July 31, 20096
June 30, 20096
May 31, 20097
April 30, 20097
March 31, 20097
February 28, 20097
January 31, 20097
December 31, 20087
November 30, 20087
October 31, 20087
September 30, 20087
August 31, 20087
July 31, 20087
June 30, 20087
May 31, 20087
March 31, 20082
February 29, 20082
January 31, 20082
December 31, 20072
November 30, 20072
October 31, 20072
September 30, 20076
August 31, 20076
July 31, 20076
June 30, 20076
May 31, 20076
April 30, 20076
March 31, 20076
February 28, 20076
January 31, 20076
December 31, 20066
November 30, 20066
October 31, 20065
September 30, 20067
June 30, 20067
May 31, 20067
April 30, 20067
March 31, 20067
February 28, 20062
January 31, 20062
December 31, 20052
November 30, 20054
October 31, 20054
September 30, 20054
August 31, 20059
July 31, 20059
June 30, 200511
May 31, 200511
April 30, 200511
March 31, 200511
February 28, 200518
January 31, 200518
December 31, 200418
November 30, 200418
October 31, 200418
September 30, 200418
August 31, 200415
July 31, 200415
June 30, 200418
May 31, 200418
April 30, 200418
March 31, 200418
February 29, 200418

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Evan M. LevineN/A4,395,0002.76%2008-02-08
Dr. M. Ross Johnson,PhDN/A1,621,7791.02%2006-12-21
R. Martin Emanuele,PhDN/A294,5980.18%2013-05-30
David A. RamsayN/A100,000less than 0.1%2012-05-14
Dr. James A. Merritt,M.D.N/A35,000less than 0.1%2007-12-14
Brian M. Culley,M.S.N/A34,500less than 0.1%2012-03-14
Dr. Michael M. Goldberg,M.D.N/A26,000less than 0.1%2006-10-15
Ms. Carrie E. McQueenN/A25,000less than 0.1%2005-06-15
Dr. Joan M. Robbins,PhDN/A10,000less than 0.1%2008-05-13
Dr. Mark J. Pykett,PhD,V.M.D.N/A8,000less than 0.1%2004-05-24

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value
Franklin Advisers, Inc.11,946,1002014-12-317.490.016,690,000
Bvf Inc7,291,6002014-12-314.570.794,083,000
Franklin Biotechnology Discovery6,592,6002014-10-315.130.133,354,974
Franklin Biotechnology Discovery Fund5,353,5002014-12-313.360.172,997,960
Baker Bros Advisors LLC4,774,4342014-12-312.990.032,674,000
Alyeska Investment Group, L.P.4,678,8552014-12-312.930.052,620,000
Sabby Management LLC3,539,7792014-12-312.220.061,982,000
Vanguard Group, Inc.3,382,4832014-12-312.120.001,894,000
ProQuest Associates IV LLC2,551,8512014-12-311.600.721,429,000
Mpm Asset Management, LLC2,551,8512014-12-311.600.321,429,000

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