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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 (%)Short Interest (Shares in Mil)
December 30, 20165.60.88
December 15, 20165.440.86
November 30, 20165.440.86
November 15, 20165.650.89
October 31, 20165.70.90
October 14, 20165.480.86
September 30, 20165.710.90
September 15, 20166.10.96
August 31, 20167.691.21
August 15, 20167.851.24
July 29, 20167.851.24
July 15, 20167.631.20
June 30, 20167.891.24
June 15, 20167.921.25
May 31, 20168.11.28
May 13, 20168.551.35
April 29, 20168.651.36
April 15, 20164.341.16
March 31, 20168.91.19
March 15, 201612.281.64
February 29, 201617.72.36
February 12, 201618.552.48
January 29, 201618.742.50
January 15, 201619.442.60
December 31, 201519.462.60
December 15, 201520.342.72
November 30, 201521.072.81
November 13, 201521.732.90
October 30, 201522.653.02
October 15, 201522.723.03
September 30, 201524.473.27
September 15, 201525.953.47
August 31, 201526.183.50
August 14, 201523.673.16
July 31, 201528.393.79
July 15, 201529.723.97
June 30, 201539.185.23
June 15, 201539.485.27
May 29, 201540.675.43
May 15, 201542.35.65
April 30, 201544.515.94
April 15, 201542.25.64
March 31, 201526.535.51
March 13, 201525.355.26
February 27, 201524.375.06
February 13, 201523.844.95
January 30, 201524.715.13
January 15, 201525.065.20
December 31, 201424.715.13
December 15, 201429.326.09
November 28, 201429.466.11
November 14, 201428.515.92
October 31, 201427.815.77
October 15, 201423.624.90
September 30, 201423.454.87
September 15, 201435.367.34
August 29, 201436.447.56
August 15, 201436.347.54
July 31, 201434.457.15
July 15, 201432.846.82
June 30, 201431.526.54
June 13, 201432.116.67
May 30, 201430.686.37
May 15, 201431.016.44
April 30, 201433.616.98
April 15, 201438.366.79
March 31, 201438.946.89
March 14, 201442.967.60
February 28, 201447.818.46
February 14, 201448.988.67
January 31, 201448.98.65
January 15, 201446.748.27
December 31, 201344.77.91
December 13, 201344.857.94
November 29, 201345.348.02
November 15, 201343.437.68
October 31, 201339.827.05
October 15, 201336.316.42
September 30, 201337.86.69
September 13, 201337.526.64
August 30, 201342.057.44
August 15, 201342.47.50
July 31, 201338.326.78
July 15, 201337.776.68
June 28, 201337.316.60
June 14, 201340.517.17
May 31, 201333.535.93
May 15, 201330.655.42
April 30, 201327.44.85
April 15, 201328.264.16
March 28, 201326.543.91
March 15, 201325.173.71
February 28, 201326.413.89
February 15, 201326.173.85
January 31, 201323.143.41
January 15, 201322.83.36
December 31, 201224.093.55
December 14, 201225.763.79
November 30, 201232.384.77
November 15, 201233.614.95
October 31, 201231.884.69
October 15, 201232.854.84
September 28, 201233.894.99
September 14, 201235.065.16
August 31, 201235.715.26
August 15, 201237.475.52
July 31, 201236.675.40
July 13, 201237.045.45
June 29, 201237.45.51
June 15, 201238.835.72
May 31, 201237.295.49
May 15, 201236.15.32
April 30, 201235.665.25
April 13, 201230.215.29
March 30, 201227.864.88
March 15, 201229.415.15
February 29, 201227.854.88
February 15, 201226.714.68
January 31, 201225.634.49
January 13, 201224.794.34
December 30, 201124.454.28
December 15, 201126.034.56
November 30, 201128.184.94
November 15, 201131.375.50
October 31, 201131.495.52
October 14, 201132.045.61
September 30, 201130.155.28
September 15, 201131.175.46
August 31, 201131.975.60
August 15, 201137.86.62
July 29, 201153.459.37
July 15, 201155.299.69
June 30, 201152.49.18
June 15, 201149.168.61
May 31, 201150.758.89
May 13, 201151.38.99
April 29, 201148.378.48
April 15, 201150.168.79
March 31, 201180.999.46
March 15, 201181.839.56
February 28, 201185.9710.04
February 15, 201188.7310.36
January 31, 201191.610.70
January 14, 201183.759.78
December 31, 201082.989.69
December 15, 201083.219.72
November 30, 201089.2910.43
November 15, 201088.1510.30
October 29, 201089.3310.43
October 15, 201089.6810.47
September 30, 201085.810.02
September 15, 201080.529.40
August 31, 201076.398.92
August 13, 201069.848.16
July 30, 201061.287.16
July 15, 201057.076.67
June 30, 201050.515.90
June 15, 201048.435.66
May 28, 201046.145.39
May 14, 201044.655.22
April 30, 201041.814.88
April 15, 201023.074.97
March 31, 201022.644.87
March 15, 201022.714.60
February 26, 201021.84.41
February 12, 201020.614.17
January 29, 201019.693.98
January 15, 201019.814.01
December 31, 200920.44.13
December 15, 200920.694.15
November 30, 200921.754.36
November 13, 200920.664.14
October 30, 200917.273.46
October 15, 200914.722.95
September 30, 200912.642.53
September 15, 200910.412.09
August 31, 20099.291.86
August 14, 20097.441.49
July 31, 20096.751.35
July 15, 20096.71.34
June 30, 20093.810.76
June 15, 20093.970.80
May 29, 20094.50.90
May 15, 20094.170.83
April 30, 20093.480.74
April 15, 20094.460.95
March 31, 20095.081.08
March 13, 20094.821.03
February 27, 20094.470.95
February 13, 20094.110.87
January 30, 20095.151.10
January 15, 20094.81.02
December 31, 20084.81.02
December 15, 20085.661.20
November 28, 20085.341.14
November 14, 20085.091.08
October 31, 20085.871.25
October 15, 20087.141.52
September 30, 20088.841.88
September 15, 200812.32.60
August 29, 200811.592.45
August 15, 20088.891.88
July 31, 200810.532.23
July 15, 200811.922.52
June 30, 20088.951.89
June 13, 20087.321.53
May 30, 20085.731.20
May 15, 20085.021.05
April 30, 20085.681.17
April 15, 20084.440.92
March 31, 20084.210.87
March 14, 20083.210.66
February 29, 20082.570.53
February 15, 20082.390.49
January 31, 20082.310.47
January 15, 20081.890.39
December 31, 20072.080.43
December 11, 20071.180.23
November 27, 20070.170.03

Institutional Ownership History (%)

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

Date Institutional Ownership (%)Institutional Ownership (Shares in Mil)
December 31, 201650.4113.52
September 30, 201646.7312.54
June 30, 201650.0913.44
March 31, 201662.2416.62
December 31, 201576.5920.10
September 30, 201574.5619.49
June 30, 201583.1221.79
March 31, 201586.9722.78
December 31, 201484.722.14
September 30, 201480.2120.97
June 30, 201498.7125.81
March 31, 201492.7124.25
December 31, 201383.8819.01
September 30, 201379.4818.01
June 30, 201398.0522.10
March 31, 201355.6512.57
December 31, 201252.7511.90
September 30, 201257.1412.88
June 30, 201292.9220.94
March 31, 201261.7613.92
December 31, 201159.3413.36
September 30, 201157.3612.97
June 30, 201189.5420.67
March 31, 201199.5922.95
June 30, 201092.4822.38
March 31, 201079.2817.07
December 31, 200991.7418.60
September 30, 200976.8115.36
June 30, 200965.8213.09
March 31, 200975.4816.06
December 31, 200864.2413.79
September 30, 200865.7713.88
June 30, 200870.6714.95
March 31, 200838.757.99
December 31, 200738.247.83

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 (%)Insider Ownership (Shares in Mil)
December 31, 20163.510.94
November 30, 20163.510.94
October 31, 20163.470.93
September 30, 20163.690.99
August 31, 20163.690.99
July 31, 20163.690.99
June 30, 20163.690.99
May 31, 20163.30.88
April 30, 20163.30.88
March 31, 20163.30.88
February 29, 20163.360.88
January 31, 20163.360.88
December 31, 20153.30.88
November 30, 20151.20.31
October 31, 20151.20.31
September 30, 20151.190.31
August 31, 20151.190.31
July 31, 20151.190.31
June 30, 20151.190.31
May 31, 20151.190.31
April 30, 20151.190.31
March 31, 20151.190.31
February 28, 20151.190.31
January 31, 20151.190.31
December 31, 20140.980.26
November 30, 20140.960.25
October 31, 20140.960.25
September 30, 20140.960.25
August 31, 20140.960.25
July 31, 20140.960.25
June 30, 20140.960.25
May 31, 20140.980.26
March 31, 20141.110.26
February 28, 20141.110.26
January 31, 20141.110.26
December 31, 20131.110.26
November 30, 20130.990.23
October 31, 20130.990.23
September 30, 20130.990.23
August 31, 20130.970.22
July 31, 20130.970.22
June 30, 20130.970.22
May 31, 20130.770.18
April 30, 20130.770.18
March 31, 20130.770.18
January 31, 20130.770.18
November 30, 20120.650.15
October 31, 20120.650.15
September 30, 20120.650.15
August 31, 20120.650.15
July 31, 20120.650.15
June 30, 20120.650.15
May 31, 20120.650.15
April 30, 20120.650.15
March 31, 20120.650.15
February 29, 20120.650.15
January 31, 20120.630.15
December 31, 20110.570.13
November 30, 20110.570.13
October 31, 20110.570.13
September 30, 20110.570.13
August 31, 20110.570.13
July 31, 20110.570.13
June 30, 20110.570.13
May 31, 20110.570.13
April 30, 20110.550.13
March 31, 20110.550.13
February 28, 20110.540.12
January 31, 20110.530.12
December 31, 20100.530.12
November 30, 20100.530.12
October 31, 20100.530.12
September 30, 20100.530.12
August 31, 20100.530.12
July 31, 20100.530.12
June 30, 20100.60.12
May 31, 20100.680.14
April 30, 20100.680.14
March 31, 20100.680.14
February 28, 20100.680.14
January 31, 20100.690.14
December 31, 20090.690.14
November 30, 20090.710.14
October 31, 20090.670.14
September 30, 20090.670.14
August 31, 20090.710.14
July 31, 20090.690.14
June 30, 20090.690.14
May 31, 20090.690.14
April 30, 20090.650.14
March 31, 20090.650.14
February 28, 20090.650.14
January 31, 20090.650.14
April 30, 20081.060.22
March 31, 20081.070.22
February 29, 20081.020.21
January 31, 20080.990.20
December 31, 20071.060.20
November 30, 20070.990.19

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Mr. Michael E. MikolajczykN/A308,6071.15%2016-10-01
Mr. Don N. AquilanoN/A208,8540.78%2016-10-01
Mr. Raymond J. SpencerN/A137,1580.51%2016-07-01
Timothy E. BrogN/A106,5740.4%2016-07-01
Mr. Donald R. CaldwellN/A105,0500.39%2016-01-01
Mr. Hany TamimN/A36,3330.14%2016-12-31
Mr. Raja M. ParvezN/A27,9850.1%2013-12-31
Mr. William F. WeissmanN/A14,136less than 0.1%2014-12-31
Gordon HunterN/A8,900less than 0.1%2009-12-28
Mardel A. GraffyN/A6,063less than 0.1%2016-11-01

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value($1000)
Ariel Investments, LLC Premium3,760,7292016-09-3014.020.032,370
Fidelity Management and Research Company   Premium Plus2,738,8742016-09-3010.21N/A1,725
Fidelity® Select Technology Portfolio1,141,1912016-11-304.250.02565
Royce & Associates, LLC Premium1,103,5892016-09-304.11N/A695
Ecofin Limited   Premium Plus845,0722015-12-313.22N/A963
Royce Opportunity Fund800,9532016-09-302.990.04505
Vanguard Group Inc   Premium Plus719,0162016-09-302.68N/A453
Renaissance Technologies Corp Premium706,9002016-09-302.63N/A445
Aegis Financial Corporation   Premium Plus636,9002016-09-302.370.40401
Aegis Value Fund611,2002016-09-302.280.30385
Fidelity® Stock Selector All Cap Fund563,0782016-11-302.10N/A279
BlackRock Fund Advisors   Premium Plus523,6902016-09-301.95N/A330
New York State Common Retirement Fund   Premium Plus505,7902016-09-301.89N/A319
River and Mercantile Asset Management471,9002016-11-301.800.09240
River and Mercantile World Recovery Fund471,9002016-11-301.800.09240
Wolverine Asset Management LLC   Premium Plus364,2562016-09-301.35N/A229
Fidelity Advisor® Technology Fund309,9672016-11-301.160.01154
Vanguard Extended Market Index Fund268,3192016-12-311.03N/A166
Northern Trust Investments N A   Premium Plus211,3662016-09-300.79N/A133
Fidelity Asset Manager® 50% Fund204,0352016-11-300.76N/A101

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