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Rubicon Technology Inc (RBCN) Ownership Data

Short Interest History (%)

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

Date Short Interest
August 14, 201523.67
July 31, 201528.39
July 15, 201529.72
June 30, 201539.18
June 15, 201539.48
May 29, 201540.67
May 15, 201542.3
April 30, 201544.51
April 15, 201542.2
March 31, 201526.53
March 13, 201525.35
February 27, 201524.37
February 13, 201523.84
January 30, 201524.71
January 15, 201525.06
December 31, 201424.71
December 15, 201429.32
November 28, 201429.46
November 14, 201428.51
October 31, 201427.81
October 15, 201423.62
September 30, 201423.45
September 15, 201435.36
August 29, 201436.44
August 15, 201436.34
July 31, 201434.45
July 15, 201432.84
June 30, 201431.52
June 13, 201432.11
May 30, 201430.68
May 15, 201431.01
April 30, 201433.61
April 15, 201438.36
March 31, 201438.94
March 14, 201442.96
February 28, 201447.81
February 14, 201448.98
January 31, 201448.9
January 15, 201446.74
December 31, 201344.7
December 13, 201344.85
November 29, 201345.34
November 15, 201343.43
October 31, 201339.82
October 15, 201336.31
September 30, 201337.8
September 13, 201337.52
August 30, 201342.05
August 15, 201342.4
July 31, 201338.32
July 15, 201337.77
June 28, 201337.31
June 14, 201340.51
May 31, 201333.53
May 15, 201330.65
April 30, 201327.4
April 15, 201328.26
March 28, 201326.54
March 15, 201325.17
February 28, 201326.41
February 15, 201326.17
January 31, 201323.14
January 15, 201322.8
December 31, 201224.09
December 14, 201225.76
November 30, 201232.38
November 15, 201233.61
October 31, 201231.88
October 15, 201232.85
September 28, 201233.89
September 14, 201235.06
August 31, 201235.71
August 15, 201237.47
July 31, 201236.67
July 13, 201237.04
June 29, 201237.4
June 15, 201238.83
May 31, 201237.29
May 15, 201236.1
April 30, 201235.66
April 13, 201230.21
March 30, 201227.86
March 15, 201229.41
February 29, 201227.85
February 15, 201226.71
January 31, 201225.63
January 13, 201224.79
December 30, 201124.45
December 15, 201126.03
November 30, 201128.18
November 15, 201131.37
October 31, 201131.49
October 14, 201132.04
September 30, 201130.15
September 15, 201131.17
August 31, 201131.97
August 15, 201137.8
July 29, 201153.45
July 15, 201155.29
June 30, 201152.4
June 15, 201149.16
May 31, 201150.75
May 13, 201151.3
April 29, 201148.37
April 15, 201150.16
March 31, 201180.99
March 15, 201181.83
February 28, 201185.97
February 15, 201188.73
January 31, 201191.6
January 14, 201183.75
December 31, 201082.98
December 15, 201083.21
November 30, 201089.29
November 15, 201088.15
October 29, 201089.33
October 15, 201089.68
September 30, 201085.8
September 15, 201080.52
August 31, 201076.39
August 13, 201069.84
July 30, 201061.28
July 15, 201057.07
June 30, 201050.51
June 15, 201048.43
May 28, 201046.14
May 14, 201044.65
April 30, 201041.81
April 15, 201023.07
March 31, 201022.64
March 15, 201022.71
February 26, 201021.8
February 12, 201020.61
January 29, 201019.69
January 15, 201019.81
December 31, 200920.4
December 15, 200920.69
November 30, 200921.75
November 13, 200920.66
October 30, 200917.27
October 15, 200914.72
September 30, 200912.64
September 15, 200910.41
August 31, 20099.29
August 14, 20097.44
July 31, 20096.75
July 15, 20096.7
June 30, 20093.81
June 15, 20093.97
May 29, 20094.5
May 15, 20094.17
April 30, 20093.48
April 15, 20094.46
March 31, 20095.08
March 13, 20094.82
February 27, 20094.47
February 13, 20094.11
January 30, 20095.15
January 15, 20094.8
December 31, 20084.8
December 15, 20085.66
November 28, 20085.34
November 14, 20085.09
October 31, 20085.87
October 15, 20087.14
September 30, 20088.84
September 15, 200812.3
August 29, 200811.59
August 15, 20088.89
July 31, 200810.53
July 15, 200811.92
June 30, 20088.95
June 13, 20087.32
May 30, 20085.73
May 15, 20085.02
April 30, 20085.68
April 15, 20084.44
March 31, 20084.21
March 14, 20083.21
February 29, 20082.57
February 15, 20082.39
January 31, 20082.31
January 15, 20081.89
December 31, 20072.08
December 11, 20071.18
November 27, 20070.17

Institutional Ownership History (%)

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

Date Institutional Ownership
June 30, 201591
March 31, 201587
December 31, 201485
September 30, 201480
March 31, 201493
December 31, 201383
September 30, 201379
June 30, 201394
March 31, 201355
December 31, 201252
September 30, 201257
June 30, 201293
March 31, 201261
December 31, 201159
September 30, 201157
June 30, 201189
March 31, 201199
June 30, 201093
March 31, 201079
December 31, 200992
September 30, 200977
June 30, 200966
March 31, 200975
December 31, 200864
September 30, 200865
June 30, 200868
March 31, 200838
December 31, 200736

Insider ownership (%)

This is the historical insider ownership of Rubicon Technology 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
July 31, 20151
June 30, 20151
May 31, 20151
April 30, 20151
March 31, 20151
February 28, 20151
January 31, 20151
December 31, 20141
November 30, 20141
October 31, 20141
September 30, 20141
August 31, 20141
July 31, 20141
June 30, 20141
May 31, 20141
March 31, 20141
February 28, 20141
January 31, 20141
December 31, 20131
November 30, 20131
October 31, 20131
September 30, 20131
August 31, 20131
July 31, 20131
June 30, 20131
May 31, 20131
April 30, 20131
March 31, 20131
January 31, 20131
November 30, 20121
October 31, 20121
September 30, 20121
August 31, 20121
July 31, 20121
June 30, 20121
May 31, 20121
April 30, 20121
March 31, 20121
February 29, 20121
January 31, 20121
December 31, 20111
November 30, 20111
October 31, 20111
September 30, 20111
August 31, 20111
July 31, 20111
June 30, 20111
May 31, 20111
April 30, 20111
March 31, 20111
February 28, 20111
January 31, 20111
December 31, 20101
November 30, 20101
October 31, 20101
September 30, 20101
August 31, 20101
July 31, 20101
June 30, 20101
May 31, 20101
April 30, 20101
March 31, 20101
February 28, 20101
January 31, 20101
December 31, 20091
November 30, 20091
October 31, 20091
September 30, 20091
August 31, 20091
July 31, 20091
June 30, 20091
May 31, 20091
April 30, 20091
March 31, 20091
February 28, 20091
January 31, 20091
April 30, 20081
March 31, 20081
February 29, 20081
January 31, 20081
December 31, 20071
November 30, 20071

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Mr. Michael E. MikolajczykDirector128,1690.49%2015-01-01
Mr. Don N. AquilanoDirector54,8310.21%2015-01-01
Mr. Raymond J. SpencerDirector40,2280.15%2015-01-01
Mr. Donald R. CaldwellDirector, 10% Owner35,5330.14%2015-01-01
Mr. Raja M. ParvezPresident/CEO27,9850.11%2013-12-31
Mr. William F. WeissmanCFO, Treasurer and Secretary14,136less than 0.1%2014-12-31
Gordon HunterN/A8,900less than 0.1%2009-12-28
Mardel A. GraffyN/A792less than 0.1%2014-11-01


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