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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
July 15, 20153.21
June 30, 20153.27
June 15, 20153.26
May 29, 20153.36
May 15, 20153.36
April 30, 20152.95
April 15, 20154.42
March 31, 20154.5
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
June 30, 201526
March 31, 201526
December 31, 201431
September 30, 201419
June 30, 201418
March 31, 201420
December 31, 201323
September 30, 201335
June 30, 201347
March 31, 201311
December 31, 201211
September 30, 201215
June 30, 201219
March 31, 201223
December 31, 201124
September 30, 201114
June 30, 201130
March 31, 201129
December 31, 20104
September 30, 20102
June 30, 201011
March 31, 20103
September 30, 20096
June 30, 20097
March 31, 20098
June 30, 200814
March 31, 200813
December 31, 200713
December 31, 200630
December 31, 200518
September 30, 200519
June 30, 20058
March 31, 20054
December 31, 20045
September 30, 20048
June 30, 20047
March 31, 20045
December 31, 20035

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
April 30, 20154
March 31, 20154
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
R. Martin Emanuele,PhDN/A294,5980.18%2013-05-30
Ms. Brandi L. RobertsCFO & SVP38,000less than 0.1%2015-03-26

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value($1000)
Franklin Advisers, Inc.   Premium Plus11,946,1002015-03-317.49N/A5,794
Bvf Inc   Premium Plus7,241,6002015-03-314.540.733,512
Franklin Biotechnology Discovery6,592,6002015-04-304.170.123,362
Franklin Biotechnology Discovery Fund5,353,5002015-03-313.360.132,596
Baker Bros Advisors LLC   Premium Plus4,707,4642015-03-312.950.022,283
Vanguard Group, Inc.   Premium Plus3,695,0622015-03-312.32N/A1,792
ProQuest Associates IV LLC   Premium Plus2,551,8512015-03-311.600.401,238
Mpm Asset Management, LLC   Premium Plus2,551,8512015-03-311.620.271,250
Alyeska Investment Group, L.P.   Premium Plus2,398,8922015-03-311.500.021,163
Vanguard Total Stock Mkt Idx2,339,0862015-06-301.43N/A1,146

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