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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
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
April 30, 201596
March 31, 201594
February 28, 201597
January 31, 201597
December 31, 201492
November 30, 201492
October 31, 201495
September 30, 201488
March 31, 201493
February 28, 201488
January 31, 201488
December 31, 201392
August 31, 201398
July 31, 201399
June 30, 201379
May 31, 201377
April 30, 201377
March 31, 201331
February 28, 201376
January 31, 201376
December 31, 201280
November 30, 201281
October 31, 201280
September 30, 201292
August 31, 201292
July 31, 201292
June 30, 201286
May 31, 201284
April 30, 201284
March 31, 201257
February 29, 201260
January 31, 201260
December 31, 201166
November 30, 201166
October 31, 201166
September 30, 201184
August 31, 201190
July 31, 201199
June 30, 201196
May 31, 201194
June 30, 201089
May 31, 201090
April 30, 201082
March 31, 201083
February 28, 201081
January 31, 201076
December 31, 200976
November 30, 200977
October 31, 200972
September 30, 200961
August 31, 200961
July 31, 200957
June 30, 200959
May 31, 200959
April 30, 200958
March 31, 200959
February 28, 200960
January 31, 200963
December 31, 200863
November 30, 200863
October 31, 200860
September 30, 200863
August 31, 200863
July 31, 200863
June 30, 200868
May 31, 200868
April 30, 200868
March 31, 200839
February 29, 200839
January 31, 200839

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
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

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value
Ariel Investments, LLC Premium4,624,1072015-03-3117.650.2018,219,000
Columbia Wanger Asset Management LLC Premium3,400,0002015-03-3112.980.0713,396,000
Fidelity Management and Research Company   Premium Plus3,139,5172015-03-3111.980.0012,370,000
Columbia Acorn Fund2,500,0002015-03-319.540.079,850,000
CO-INVESTMENT FUND II LP2,255,2012014-04-298.620.0025,461,219
Royce & Associates, LLC Premium1,557,8482015-03-315.950.026,138,000
Ecofin Limited   Premium Plus1,302,7412015-03-314.970.745,133,000
Fidelity® Select Technology Portfolio1,264,3182015-03-314.830.184,981,413
Aegis Financial Corporation   Premium Plus879,2002015-03-313.361.993,464,000
Royce Opportunity Fund868,1062015-03-313.310.153,420,338

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