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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)
August 31, 20175.620.10
August 15, 20175.970.11
July 31, 20175.750.10
July 14, 20176.210.11
June 30, 20175.730.10
June 15, 20176.390.11
May 31, 20175.710.10
May 15, 20175.890.10
April 28, 20174.690.08
April 13, 20174.770.08
March 31, 20175.620.09
March 15, 20175.550.09
February 28, 20175.60.09
February 15, 20175.540.09
January 31, 20176.250.10
January 13, 20175.760.09
December 30, 20165.60.09
December 15, 20165.440.09
November 30, 20165.440.09
November 15, 20165.650.09
October 31, 20165.70.09
October 14, 20165.480.09
September 30, 20165.710.09
September 15, 20166.10.10
August 31, 20167.690.12
August 15, 20167.850.12
July 29, 20167.850.12
July 15, 20167.630.12
June 30, 20167.890.12
June 15, 20167.920.12
May 31, 20168.10.13
May 13, 20168.550.13
April 29, 20168.650.14
March 31, 20168.90.12
March 15, 201612.280.16
February 29, 201617.70.24
February 12, 201618.550.25
January 29, 201618.740.25
January 15, 201619.440.26
December 31, 201519.460.26
December 15, 201520.340.27
November 30, 201521.070.28
November 13, 201521.730.29
October 30, 201522.650.30
October 15, 201522.720.30
September 30, 201524.470.33
September 15, 201525.950.35
August 31, 201526.180.35
August 14, 201523.670.32
July 31, 201528.390.38
July 15, 201529.720.40
June 30, 201539.180.52
June 15, 201539.480.53
May 29, 201540.670.54
May 15, 201542.30.56
April 30, 201544.510.59
April 15, 201542.20.56
March 31, 201526.530.55
March 13, 201525.350.53
February 27, 201524.370.51
February 13, 201523.840.49
January 30, 201524.710.51
January 15, 201525.060.52
December 31, 201424.710.51
December 15, 201429.320.61
November 28, 201429.460.61
November 14, 201428.510.59
October 31, 201427.810.58
October 15, 201423.620.49
September 30, 201423.450.49
September 15, 201435.360.73
August 29, 201436.440.76
August 15, 201436.340.75
July 31, 201434.450.72
July 15, 201432.840.68
June 30, 201431.520.65
June 13, 201432.110.67
May 30, 201430.680.64
May 15, 201431.010.64
April 30, 201433.610.70
April 15, 201438.360.68
March 31, 201438.940.69
March 14, 201442.960.76
February 28, 201447.810.85
February 14, 201448.980.87
January 31, 201448.90.87
January 15, 201446.740.83
December 31, 201344.70.79
December 13, 201344.850.79
November 29, 201345.340.80
November 15, 201343.430.77
October 31, 201339.820.70
October 15, 201336.310.64
September 30, 201337.80.67
September 13, 201337.520.66
August 30, 201342.050.74
August 15, 201342.40.75
July 31, 201338.320.68
July 15, 201337.770.67
June 28, 201337.310.66
June 14, 201340.510.72
May 31, 201333.530.59
May 15, 201330.650.54
April 30, 201327.40.48
April 15, 201328.260.42
March 28, 201326.540.39
March 15, 201325.170.37
February 28, 201326.410.39
February 15, 201326.170.39
January 31, 201323.140.34
January 15, 201322.80.34
December 31, 201224.090.35
December 14, 201225.760.38
November 30, 201232.380.48
November 15, 201233.610.50
October 31, 201231.880.47
October 15, 201232.850.48
September 28, 201233.890.50
September 14, 201235.060.52
August 31, 201235.710.53
August 15, 201237.470.55
July 31, 201236.670.54
July 13, 201237.040.55
June 29, 201237.40.55
June 15, 201238.830.57
May 31, 201237.290.55
May 15, 201236.10.53
April 30, 201235.660.53
April 13, 201230.210.53
March 30, 201227.860.49
March 15, 201229.410.52
February 29, 201227.850.49
February 15, 201226.710.47
January 31, 201225.630.45
January 13, 201224.790.43
December 30, 201124.450.43
December 15, 201126.030.46
November 30, 201128.180.49
November 15, 201131.370.55
October 31, 201131.490.55
October 14, 201132.040.56
September 30, 201130.150.53
September 15, 201131.170.55
August 31, 201131.970.56
August 15, 201137.80.66
July 29, 201153.450.94
July 15, 201155.290.97
June 30, 201152.40.92
June 15, 201149.160.86
May 31, 201150.750.89
May 13, 201151.30.90
April 29, 201148.370.85
April 15, 201150.160.88
March 31, 201180.990.95
March 15, 201181.830.96
February 28, 201185.971.00
February 15, 201188.731.04
January 31, 201191.61.07
January 14, 201183.750.98
December 31, 201082.980.97
December 15, 201083.210.97
November 30, 201089.291.04
November 15, 201088.151.03
October 29, 201089.331.04
October 15, 201089.681.05
September 30, 201085.81.00
September 15, 201080.520.94
August 31, 201076.390.89
August 13, 201069.840.82
July 30, 201061.280.72
July 15, 201057.070.67
June 30, 201050.510.59
June 15, 201048.430.57
May 28, 201046.140.54
May 14, 201044.650.52
April 30, 201041.810.49

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)
June 30, 201720.920.57

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)
June 30, 201743.661.18
May 31, 201743.661.18
April 30, 20174.41.18
March 31, 20173.580.96
February 28, 20173.580.96
January 31, 20173.590.96
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/A308,60711.35%2016-10-01
Mr. Don N. AquilanoN/A208,8547.68%2016-10-01
Mr. Raymond J. SpencerN/A137,1585.04%2016-07-01
Timothy E. BrogN/A106,5743.92%2016-07-01
Mr. Donald R. CaldwellN/A105,0503.86%2016-01-01
Mr. Hany TamimN/A36,3331.34%2016-12-31
Mr. Raja M. ParvezN/A27,9851.03%2013-12-31
Mr. William F. WeissmanN/A14,1360.52%2014-12-31
Gordon HunterN/A8,9000.33%2009-12-28
Mardel A. GraffyN/A6,0630.22%2016-11-01

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value($1000)
Ariel Investments, LLC Premium3,251,7262016-12-3112.120.021,951
Royce & Associates, LLC Premium771,0902016-12-312.96N/A477
Renaissance Technologies Corp Premium832,9002016-12-313.11N/A500
Wolverine Asset Management LLC   Premium Plus364,2562016-12-311.35N/A218
Ancora Advisors LLC   Premium Plus160,7002016-12-310.600.0196
New York State Common Retirement Fund   Premium Plus505,7902016-12-311.94N/A313
Vanguard Group Inc   Premium Plus284,9672016-12-311.09N/A176
BlackRock Fund Advisors   Premium Plus523,6902016-12-311.95N/A314
Fidelity Management and Research Company   Premium Plus2,628,8092016-12-3110.11N/A1,627
Aegis Financial Corporation   Premium Plus564,5482016-12-312.110.33339
Ecofin Limited   Premium Plus845,0722015-12-313.22N/A963
Fidelity® Select Technology Portfolio1,141,1912017-01-314.250.02616
Royce Opportunity Fund608,4542016-12-312.340.03377
Fidelity® Stock Selector All Cap Fund574,2932017-01-312.14N/A310
Aegis Value Fund541,4232016-12-312.080.25335
River and Mercantile Asset Management471,9002017-01-311.730.08250
River and Mercantile World Recovery Fund471,9002017-01-311.730.08250
Fidelity Advisor® Technology Fund309,9672017-01-311.160.01167
Vanguard Extended Market Index Fund268,3192017-02-280.95N/A150
Fidelity Asset Manager® 50% Fund195,4682017-01-310.73N/A106

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