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ARCA biopharma Inc (ABIO)Ownership Data

Short Interest History (%)

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

Date Short Interest
January 30, 20157.03
January 15, 20157.14
December 31, 20148.44
December 15, 20149.1
November 28, 20148.85
November 14, 201411.29
October 31, 201412.19
October 15, 201414.98
September 30, 201415.57
September 15, 201416.71
August 29, 201417.46
August 15, 201418.5
July 31, 201419.59
July 15, 201420.01
June 30, 201421.68
June 13, 201422.73
May 30, 201424.05
May 15, 201426.1
April 30, 201427.21
April 15, 201428.2
March 31, 201427.7
March 14, 201441.25
February 28, 201435.98
February 14, 201435.32
January 31, 201436.36
January 15, 201429.72
December 31, 201324.1
December 13, 201324.82
November 29, 201314.16
November 15, 201316
October 31, 201315.26
October 15, 20139.94
September 30, 20134.47
September 13, 20133.81
August 30, 20133.72
August 15, 20133.59
July 31, 20132.6
July 15, 20132.04
June 28, 20131.61
June 14, 20137.84
May 31, 201310.79
May 15, 201311.08
April 30, 201311.24
April 15, 20139.83
March 28, 201311.8
March 15, 201310.43
February 28, 20138.82
February 15, 201311.2
January 31, 20134.59
January 15, 20134.67
December 31, 20124.84
December 14, 20121.51
November 30, 20120.45
November 15, 20121.55
October 31, 20121.58
October 15, 20121.94
September 28, 20122.01
September 14, 20121.77
August 31, 20121.68
August 15, 20121.98
July 31, 20121.7
July 13, 20122.19
June 29, 20122.22
June 15, 20122.72
May 31, 20123.07
May 15, 20123.49
April 30, 20124.34
April 13, 20124.5
March 30, 20125.41
March 15, 20128.28
February 29, 20128.91
February 15, 20129
January 31, 201212.42
January 13, 201210.69
December 30, 20119.91
December 15, 20116.36
November 30, 20117.8
November 15, 20113.26
October 31, 20113.63
October 14, 20113.85
September 30, 20114.17
September 15, 20114.71
August 31, 20116.72
August 15, 201111.12
July 29, 201112.03
July 15, 201112.1
June 30, 201112.49
June 15, 201112.51
May 31, 201111.24
May 13, 20113.49
April 29, 20111.74
April 15, 20111.93
March 31, 20111.92
March 15, 20112.21
February 28, 20112.2
February 15, 20112.27
January 31, 20112.43
January 14, 20112.7
December 31, 20102.37
December 15, 20102.44
November 30, 20102.41
November 15, 20102.37
October 29, 20102.41
October 15, 20103.2
September 30, 20104.18
September 15, 20104.67
August 31, 20105.42
August 13, 20105.97
July 30, 20106.51
July 15, 20107.75
June 30, 20108.15
June 15, 20109.18
May 28, 20109.96
May 14, 201010.62
April 30, 201012.95
April 15, 201014.03
March 31, 201020.73
March 15, 20100.47
February 26, 20100.49
February 12, 20100.5
January 29, 20100.5
January 15, 20100.51
December 31, 20090.5
December 15, 20090.5
November 30, 20090.45
November 13, 20090.62
October 30, 20090.67
October 15, 20090.67
September 30, 20090.79
September 15, 20090.89
August 31, 20090.79
August 14, 20090.78
July 31, 20090.27
July 15, 20090.32
June 30, 20090.7
June 15, 20090.2
May 29, 20090.44
May 15, 20090.4
April 30, 20090.43
April 15, 20090.2
March 31, 20090.23
March 13, 20090.09
February 27, 20090.4
February 13, 20090.26
January 30, 20090.43
January 15, 20090.51
December 31, 20080.49
December 15, 20080.53
November 28, 20080.62
November 14, 20080.23
October 31, 20080.3
October 15, 20080.46
September 30, 20080.32
September 15, 20080.31
August 29, 20080.32
August 15, 20080.31
July 31, 20080.33
July 15, 20080.36
June 30, 20080.35
June 13, 20080.34
May 30, 20080.35
May 15, 20080.34
April 30, 20080.36
April 15, 20080.39
March 31, 20080.36
March 14, 20080.5
February 29, 20080.49
February 15, 20080.48
January 31, 20080.46
January 15, 20080.49
December 31, 20070.48
December 11, 20070.5
November 27, 20070.65
November 9, 20070.56
October 26, 20070.57
October 10, 20070.66
September 25, 20070.64
September 11, 20070.86
August 10, 20070.96
July 10, 20078.02
June 12, 200715.13
May 10, 200713.97
April 10, 200716.88
March 12, 20079.77
February 12, 20077.71
January 9, 20078.85
December 12, 20068.87
November 10, 20068.55
October 10, 20069.86
September 12, 200610.74
August 10, 20069.88
July 11, 20069.75
June 12, 20069.36
May 10, 20067.79
April 10, 20067.3
March 10, 20066.09
February 10, 20066.07
January 10, 20067.2
December 12, 20050.82
November 10, 20050.85
October 11, 20050.75
September 12, 20050.62
August 10, 20050.6
July 12, 20050.62
June 10, 20050.69
May 10, 20050.71
April 12, 20050.72
March 10, 20050.53
February 10, 20050.51
January 11, 20050.59
December 10, 20040.55
November 10, 20040.59
October 12, 20040.65
September 10, 20040.69
August 10, 20040.61
July 12, 20040.57
June 9, 20040.47
May 11, 20040.39
April 12, 20040.35
March 10, 20040.19
February 10, 20040.34
January 12, 20040.58
December 10, 20030.89
November 11, 20030.83
October 10, 20030.53
September 10, 20030.27
August 12, 20030.32
July 10, 20030.88
June 10, 20030.18
May 12, 20030.14
April 10, 20030.14
March 11, 20030.79
February 11, 20030.34
January 10, 20037
December 10, 20026.76
November 12, 20020.57
October 10, 20020.25
September 10, 20020.26
August 12, 20020.44
July 10, 20020.64
June 11, 20020.65
May 10, 20020.83
April 10, 20020.79
March 12, 20020.75
February 12, 20020.77
January 10, 20020.91
December 11, 20017.66
November 12, 20017.3
October 10, 20010.71
September 5, 20010.61
August 10, 20010.42
July 10, 20010.36
June 12, 20010.44
May 10, 20010.32
April 9, 20010.31
March 12, 20010.41
February 12, 20010.39
January 9, 20010.37
December 12, 20000.25
November 10, 20000.26
October 10, 20000.27
September 12, 20000.27
August 10, 20000.42
July 11, 20000.69
June 12, 20000.54
May 10, 20000.53
April 11, 20000.4
March 10, 20000.31
February 10, 20000.29
January 11, 20000.92
December 10, 19990.44
November 10, 19990.69
October 12, 19990.7
September 10, 19990.69
August 10, 19990.73
July 12, 19990.39
June 10, 19990.35
May 11, 19990.36
April 12, 19990.34
March 10, 19990.34
February 9, 19990.36
January 8, 19990.36
December 8, 19980.35
November 6, 19980.35
October 8, 19980.4
September 8, 19980.42
August 7, 19980.4
July 8, 19980.39
June 8, 19980.39
May 8, 19980.38
April 7, 19980.13
March 6, 19980.07
February 6, 19980.26
January 8, 19980.07
December 8, 19970.06
November 7, 19970.06
October 8, 19970.17
September 8, 19970.45
August 8, 19970.53

Institutional Ownership History (%)

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

Date Institutional Ownership
January 31, 201516
December 31, 201416
November 30, 201413
October 31, 201413
September 30, 201413
August 31, 201413
July 31, 201413
June 30, 201413
May 31, 201413
April 30, 201414
March 31, 201418
February 28, 201424
January 31, 201424
December 31, 201318
November 30, 20137
October 31, 20139
September 30, 201317
August 31, 201317
July 31, 201318
June 30, 201331
May 31, 201329
April 30, 201327
March 31, 201323
February 28, 201330
January 31, 201331
December 31, 201220
November 30, 201224
October 31, 201224
September 30, 201223
August 31, 201228
July 31, 201228
June 30, 201219
May 31, 201219
April 30, 201219
March 31, 201219
February 29, 201222
January 31, 201225
December 31, 201133
November 30, 201133
October 31, 201133
September 30, 201140
August 31, 201141
July 31, 201141
June 30, 201140
May 31, 201137
April 30, 201146
March 31, 201114
February 28, 201114
January 31, 201114
December 31, 20108
November 30, 20108
October 31, 20107
September 30, 20107
August 31, 20107
July 31, 20109
June 30, 20108
May 31, 20108
April 30, 20109
March 31, 20108
February 28, 201015
October 31, 200912
September 30, 200912
August 31, 200912
July 31, 20099
June 30, 20098
May 31, 20098
April 30, 20098
March 31, 20098
February 28, 200924
January 31, 200928
December 31, 200828
November 30, 200828
October 31, 200832

Insider ownership (%)

This is the historical insider ownership of ARCA biopharma 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, 20154
December 31, 20143
November 30, 20143
October 31, 20143
September 30, 20143
August 31, 20144
July 31, 20144
June 30, 20144
May 31, 20144
March 31, 20147
February 28, 20147
January 31, 20146
December 31, 20136
November 30, 20136
October 31, 20136
September 30, 20136
August 31, 20134
July 31, 20134
June 30, 20134
May 31, 20133
April 30, 20136
March 31, 20136
January 31, 20136
November 30, 20126
October 31, 20126
September 30, 20125
August 31, 20125
July 31, 20125
June 30, 20125
May 31, 20125
April 30, 20125
March 31, 20125
February 29, 20125
January 31, 20125
December 31, 20115
November 30, 20115
October 31, 20115
September 30, 20115
August 31, 20115
July 31, 20115
June 30, 20115
May 31, 20115
April 30, 20116
March 31, 20116
February 28, 20116
January 31, 20116
December 31, 20106
November 30, 20106
October 31, 20106
September 30, 20106
August 31, 20106
July 31, 20106
June 30, 20106
May 31, 20106
April 30, 20107
March 31, 20107
February 28, 20104
January 31, 20104
December 31, 20094
November 30, 20094
October 31, 20094
May 31, 20091
April 30, 20091
March 31, 20091
February 28, 20092
January 31, 20091
February 28, 20071
January 31, 20072
December 31, 20062
November 30, 20062
October 31, 20062
September 30, 20062
June 30, 20062
May 31, 20062
April 30, 20062
March 31, 20069
February 28, 20062
January 31, 20062
December 31, 20052
November 30, 20052
October 31, 20052
September 30, 20054
August 31, 20054
July 31, 20054
June 30, 20054
May 31, 20054
April 30, 20054
March 31, 20054
February 28, 20059
January 31, 20059
December 31, 200412
November 30, 200412
October 31, 200412
September 30, 200412
August 31, 200412
July 31, 200412

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Dr. Michael R. Bristow,M.D.,PhDPresident and CEO340,7251.61%2015-02-12
Christopher D. OzeroffEVP & General Counsel150,7870.71%2015-02-12
Thomas A. KeuerN/A126,6260.6%2015-02-12
Mr. Patrick WheelerCFO101,5100.48%2014-09-18
Richard B. BrewerPresident and CEO83,4900.39%2009-01-27
Mr. Brian SelbyN/A34,5660.16%2015-02-12
Mr. Ted W. Love,M.D.N/A3,580less than 0.1%2008-12-31
Lee BendekgeyN/A1,502less than 0.1%2008-12-31

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value
Sabby Management LLC2,112,9342014-12-319.990.002,014,894
Vanguard Group, Inc.420,9522014-12-311.990.00401,000
Vanguard Total Stock Mkt Idx320,4242015-01-311.510.00227,501
Atlas Venture Fund VII LP263,2562013-12-311.680.00442,270
Knight Capital Americas LLC102,1742014-12-310.480.0097,000
GRT Capital Partners LLC90,9372014-12-310.430.0187,000
Frigate Ventures LP85,2662014-12-310.400.1081,000
Vanguard Instl Total Stock Market Index81,1002015-01-310.380.0057,581
California Public Employees Retrmnt Sys57,6952014-12-310.270.0055,018
Vanguard Extended Market Index Fund49,8282015-01-310.240.0035,378

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