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American Superconductor Corp (AMSC) Ownership Data

Short Interest History (%)

This is the historical short interest of American Superconductor Corp, as measured by the Short Percentage Of Float.

Date Short Interest (%)Short Interest (Shares in Mil)
October 31, 201713.382.25
October 13, 201713.82.32
September 29, 201713.612.29
September 15, 201713.082.20
August 31, 201712.682.13
August 15, 201710.421.75
July 31, 201710.161.71
July 14, 201710.811.82
June 30, 201711.451.93
June 15, 201713.22.22
May 31, 201713.622.29
May 15, 201718.612.20
April 28, 201718.072.14
April 13, 201718.072.14
March 31, 201717.372.05
March 15, 201716.821.99
February 28, 201716.111.90
February 15, 201715.851.87
January 31, 201715.231.80
January 13, 201714.761.74
December 30, 201614.741.74
December 15, 201614.621.73
November 30, 201614.651.73
November 15, 201614.611.73
October 31, 201615.351.81
October 14, 201614.91.76
September 30, 201615.641.85
September 15, 201616.661.97
August 31, 201617.042.01
August 15, 201615.831.87
July 29, 201617.392.06
July 15, 201617.742.10
June 30, 201617.612.08
June 15, 201613.321.57
May 31, 201613.131.55
May 13, 201613.581.55
April 29, 201613.221.51
April 15, 201613.151.50
March 31, 201612.481.42
March 15, 201612.721.45
February 29, 201612.461.42
February 12, 201612.41.41
January 29, 201611.91.36
January 15, 201611.021.26
December 31, 201510.841.23
December 15, 20159.851.12
November 30, 201510.091.15
November 13, 20159.921.13
October 30, 201510.011.14
October 15, 20159.691.10
September 30, 201510.491.20
September 15, 20158.320.95
August 31, 20158.430.96
August 14, 20158.210.94
July 31, 20158.010.91
July 15, 20157.570.86
June 30, 20157.250.83
June 15, 20157.230.82
May 29, 20159.530.77
May 15, 20158.590.69
April 30, 20157.750.62
April 15, 20154.930.40
March 31, 20153.870.31
March 13, 20153.930.32
February 27, 20153.820.31
February 13, 20153.90.31
January 30, 20154.070.33
January 15, 20154.070.33
December 31, 20144.590.37
December 15, 20146.030.39
November 28, 20146.290.41
November 14, 20147.280.47
October 31, 20147.220.47
October 15, 20147.830.50
September 30, 20147.630.49
September 15, 20147.490.48
August 29, 20147.870.51
August 15, 20147.680.50
July 31, 20147.70.50
July 15, 20146.840.44
June 30, 201412.690.82
June 13, 201410.250.66
May 30, 201412.910.58
May 15, 201415.470.70
April 30, 201414.130.64
April 15, 201414.070.64
March 31, 201411.390.52
March 14, 201410.870.49
February 28, 20149.390.42
February 14, 201410.340.47
January 31, 20149.580.43
January 15, 20149.260.42
December 31, 20139.480.43
December 13, 201310.830.49
November 29, 201310.380.47
November 15, 201310.160.46
October 31, 201311.480.52
October 15, 201311.20.51
September 30, 201311.130.50
September 13, 201311.380.51
August 30, 201311.340.51
August 15, 201311.10.50
July 31, 201310.230.46
July 15, 201310.90.49
June 28, 201310.290.47
June 14, 201310.140.46
May 31, 20139.450.43
May 15, 201310.70.42
April 30, 201310.950.43
April 15, 201311.320.45
March 28, 201311.230.44
March 15, 201311.490.45
February 28, 201310.580.42
February 15, 201310.90.43
January 31, 201310.930.43
January 15, 201311.340.45
December 31, 201212.270.49
December 14, 201212.340.49
November 30, 201212.460.49
November 15, 201212.870.51
October 31, 201213.090.52
October 15, 201213.530.54
September 28, 201213.680.54
September 14, 201214.730.58
August 31, 201214.630.58
August 15, 201215.470.61
July 31, 201216.410.65
July 13, 201219.510.77
June 29, 201223.040.91
June 15, 201227.151.07
May 31, 201230.751.22
May 15, 201231.741.21
April 30, 201232.81.25
April 13, 201234.161.30
March 30, 201234.691.32
March 15, 201235.111.34
February 29, 201234.141.30
February 15, 201233.011.26
January 31, 201232.121.22
January 13, 201231.531.20
December 30, 201131.531.20
December 15, 201131.911.22
November 30, 201132.621.24
November 15, 201131.881.21
October 31, 201130.661.17
October 14, 201129.371.12
September 30, 201124.130.92
September 15, 201122.60.87
August 31, 201123.760.91
April 29, 201139.841.26
April 15, 201140.281.27
March 31, 201128.480.90
March 15, 201134.021.07
February 28, 201135.411.12
February 15, 201136.961.17
January 31, 201136.311.15
January 14, 201135.941.13
December 31, 201035.151.11
December 15, 201034.981.10
November 30, 201035.991.14
November 15, 201037.391.18
October 29, 201037.641.19
October 15, 201037.651.19
September 30, 201036.091.14
September 15, 201035.651.12
August 31, 201034.981.10
August 13, 201034.591.09
July 30, 201035.911.13
July 15, 201038.131.20
June 30, 201038.81.22
June 15, 201041.11.30
May 28, 201042.741.35
May 14, 201043.11.36
April 30, 201042.661.35

Institutional Ownership History (%)

This the Institutional Ownership History of American Superconductor CorpPeter Lynch prefers to buy companies with low institutional ownership.

Date Institutional Ownership (%)Institutional Ownership (Shares in Mil)
September 30, 201739.327.55
June 30, 201743.558.35
March 31, 201739.15.72
December 31, 201629.034.12
September 30, 201628.484.04
June 30, 201629.884.23
March 31, 201624.113.39
December 31, 201515.512.17
September 30, 201522.132.95
June 30, 201521.883.02
March 31, 201510.160.97
December 31, 20140.110.10
December 31, 20110.050.03

Insider ownership (%)

This is the historical insider ownership of American Superconductor Corp. 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)
October 31, 20178.341.60
September 30, 20178.341.60
August 31, 20178.341.60
July 31, 20178.341.60
June 30, 20176.781.30
May 31, 20178.951.27
April 30, 20178.691.24
March 31, 20178.21.17
February 28, 20178.21.17
January 31, 20178.211.17
December 31, 20168.231.17
November 30, 20168.231.17
October 31, 20168.241.17
September 30, 20168.231.17
August 31, 20168.251.17
July 31, 20168.331.17
June 30, 20168.411.18
May 31, 20168.831.24
April 30, 20168.891.25
March 31, 20168.921.25
February 29, 20168.921.25
January 31, 20168.951.25
December 31, 20158.921.25
November 30, 20158.951.25
October 31, 20158.951.25
September 30, 20159.241.29
August 31, 20159.241.29
July 31, 20159.241.29
June 30, 20159.261.29
May 31, 20159.261.29
April 30, 201521.862.09
March 31, 201522.722.17
February 28, 20152.272.17
January 31, 20152.272.17
December 31, 20142.632.28
November 30, 20142.522.18
October 31, 20142.622.18
September 30, 20142.622.18
August 31, 20142.622.18
July 31, 20142.442.03
June 30, 20142.562.03
May 31, 20142.572.04
March 31, 20144.52.29
February 28, 20144.482.28
January 31, 20144.482.28
December 31, 20134.482.28
November 30, 20134.482.28
October 31, 20134.482.28
September 30, 20134.482.28
August 31, 20134.482.28
July 31, 20134.482.28
June 30, 20134.012.04
May 31, 20134.012.04
April 30, 20134.072.07
March 31, 20134.072.07
January 31, 20134.072.07
November 30, 20124.82.44
October 31, 20124.82.44
September 30, 20122.541.29
August 31, 20122.541.29
July 31, 20122.541.29
June 30, 20122.51.27
May 31, 20122.511.28
April 30, 20122.541.29
March 31, 20122.481.26
February 29, 20122.481.26
January 31, 20122.481.26
December 31, 20112.481.26
November 30, 20112.441.24
October 31, 20112.441.24
September 30, 20112.441.24
August 31, 20112.321.18
July 31, 20112.351.19
June 30, 20112.351.19
May 31, 20112.351.19
April 30, 20112.381.21
March 31, 20112.381.21
February 28, 20112.381.21
January 31, 20112.381.21
December 31, 20102.621.21
November 30, 20102.621.21
October 31, 20102.621.21
September 30, 20102.651.21
August 31, 20102.591.18
July 31, 20102.551.16
June 30, 20102.61.17
May 31, 20102.61.17
April 30, 20102.371.06
March 31, 20102.371.06
February 28, 20102.381.07
January 31, 20102.441.09
December 31, 20092.471.09
November 30, 20092.411.07
October 31, 20092.411.06
September 30, 20092.411.06
August 31, 20092.431.07
July 31, 20092.361.02
June 30, 20092.451.06
May 31, 20092.551.11
April 30, 20092.481.07
March 31, 20092.481.07
February 28, 20092.481.07
January 31, 20092.491.08
December 31, 20082.491.08
November 30, 20082.491.08
October 31, 20082.51.08
September 30, 20082.51.08
August 31, 20082.51.08
July 31, 20082.521.06
June 30, 20082.411.01
May 31, 20082.421.02
April 30, 20089.914.16
March 31, 20089.363.88
February 29, 20089.443.92
January 31, 20089.483.94
December 31, 20079.333.84
November 30, 20079.253.80
October 31, 20079.233.79
September 30, 20079.343.81
August 31, 20079.373.82
July 31, 20079.413.84
June 30, 20079.443.83
May 31, 200710.693.81
April 30, 20079.553.32
March 31, 20079.593.33
February 28, 20079.663.36
January 31, 200710.33.44
December 31, 20067.732.58
November 30, 20067.912.64
October 31, 20067.912.64
September 30, 20067.962.64
June 30, 20067.992.64
May 31, 20061.970.65
April 30, 20062.060.67
March 31, 20062.070.68
February 28, 20062.070.68
January 31, 200610.66
December 31, 20051.890.62
November 30, 20051.890.62
October 31, 20051.910.63
September 30, 20051.950.64
August 31, 20051.950.64
July 31, 20051.990.65
June 30, 200510.65
May 31, 20051.930.63
April 30, 20051.820.58
March 31, 20051.70.54
February 28, 20051.620.52
January 31, 20051.620.52
December 31, 20041.860.52
November 30, 20041.860.52
October 31, 20041.860.52
September 30, 20041.920.53
August 31, 20041.920.53
July 31, 20041.920.53
June 30, 20041.920.53
May 31, 20041.920.53
April 30, 20042.530.69
March 31, 20042.410.66
February 29, 20042.020.55

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Mr. Kevin G. DouglasN/A834,5333.99%2015-04-24
Dr. Gregory J. Yurek,PhDN/A176,0120.84%2011-06-01
Mr. Peter O. CrispN/A118,6030.57%2011-12-13
Mr. Daniel P. McGahnPresident and CEO116,2230.56%2016-07-31
Alexis P. MalozemoffN/A82,5000.39%2009-05-15
Andrew G.C. Sage,IIN/A76,0000.36%2007-03-13
Mr. Charles W. StankiewiczN/A65,3310.31%2011-08-23
David ParatoreN/A62,5760.3%2005-06-23
Mr. David A. HenryN/A61,9290.3%2016-07-31
Mr. John R. CollettN/A54,1000.26%2010-05-12

Top Fund Holders

HolderSharesReport Date% of Total
Assets Managed
% of Shares
Outstanding
Market Value($1000)
ARDSLEY ADVISORY PARTNERS   Premium Plus1,835,0002017-09-301.23%N/A8,331
AWM Investment Company, Inc.   Premium Plus603,3642017-09-300.49%N/A2,739
Jim Simons Premium554,2882017-09-300.00%N/A2,516
Telemark Asset Management, LLC   Premium Plus544,0442017-09-300.51%N/A2,470
VANGUARD GROUP INC   Premium Plus518,1592017-09-300.00%N/A2,352
Chuck Royce Premium369,3002017-09-300.01%N/A1,677
BlackRock Inc.   Premium Plus263,7602017-09-300.00%N/A1,197
BRIDGEWAY CAPITAL MANAGEMENT INC   Premium Plus135,1002017-09-300.01%N/A613
GEODE CAPITAL MANAGEMENT, LLC   Premium Plus94,3182017-09-300.00%N/A428
SUSQUEHANNA INTERNATIONAL GROUP, LLP   Premium Plus91,5002017-09-300.00%N/A415
DIMENSIONAL FUND ADVISORS LP   Premium Plus69,1752017-09-300.00%N/A314
GMT CAPITAL CORP   Premium Plus62,2002017-09-300.00%N/A282
WEDBUSH MORGAN SECURITIES INC   Premium Plus46,2072017-09-300.03%N/A210
Nationwide Fund Advisors   Premium Plus43,0452017-09-300.00%N/A195
GOLDMAN SACHS GROUP INC   Premium Plus42,7002017-09-300.00%N/A194
NORTHERN TRUST CORP   Premium Plus42,3422017-09-300.00%N/A193
WOLVERINE TRADING, LLC   Premium Plus34,3152017-09-300.00%N/A156
FIRST MANHATTAN CO   Premium Plus34,0192017-09-300.00%N/A154
Citadel Advisors LLC   Premium Plus33,6002017-09-300.00%N/A153
D. E. Shaw & Co., Inc.   Premium Plus28,9642017-09-300.00%N/A131

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