美国超导
AMSC

股本结构

单位：万股
公告日期 2025-11-05 2025-07-30 2025-07-30 2025-06-11 2025-06-13 2025-05-21
证券总股本 4518.68 4516.09 4516.09 4362.77 4038.27 3950.27
普通股本 4518.68 4516.09 4516.09 4362.77 4038.27 3950.27
优先股 未披露 未披露 未披露 未披露 未披露 未披露
其他 未披露 未披露 未披露 未披露 未披露 未披露
变动日期 2025-09-30 2025-07-25 2025-06-30 2025-06-12 2025-05-29 2025-05-16
注释：中概股证券总股本=普通股股本/ 存托凭证比例

历史变动

公告日期 变动后普通股本（万股） 变动后优先股（万股） 变动原因 变动日期
2025-11-05 4518.68 未披露
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From June 30, 2025 to September 30, 2025 Exercise of stock options Issuance of common stock - restricted shares, net of forfeited shares Issuance of common stock - ESPP Issuance of common stock for 401(k) match
2025-09-30
2025-07-30 4516.09 未披露 定期报告 2025-07-25
2025-07-30 4516.09 未披露
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From March 31, 2025 to June 30, 2025 Issuance of common stock – restricted shares, net of forfeited shares Issuance of common stock - equity offering, net of offering expenses Issuance of common stock for 401(k) match
2025-06-30
2025-06-11 4362.77 未披露
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Common stock offered 4,125,000 shares by the company
2025-06-12
2025-06-13 4038.27 未披露 定期报告 2025-05-29
2025-05-21 3950.27 未披露 定期报告 2025-05-16
2025-05-21 3948.42 未披露
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From March 31, 2024 to March 31, 2025 Issuance of stock for 401(k) match Repurchase of treasury stock Issuance of common stock - ESPP Issuance of common stock - restricted shares, net of forfeited shares Issuance of common stock to settle contingent consideration Issuance of common stock - NWL acquisition, net of offering expenses
2025-03-31
2025-02-05 3945.97 未披露
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From September 30, 2024 to December 31, 2024 Issuance of common stock for 401(k) match Issuance of common stock – restricted shares
2024-12-31
2024-10-30 3945.32 未披露 定期报告 2024-10-25
2024-10-30 3982.70 未披露
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From June 30, 2024 to September 30, 2024 Issuance of common stock – ESPP Issuance of common stock - restricted shares Issuance of common stock for 401(k) match Issuance of common stock - Megatran acquisition, net of offering expenses Issuance of common stock to settle contingent consideration
2024-09-30
2024-08-06 3829.58 未披露 定期报告 2024-08-02
2024-06-20 3699.82 未披露 定期报告 2024-06-06
2024-05-29 3699.45 未披露 定期报告 2024-05-24
2024-05-29 3694.62 未披露
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From March 31, 2023 to March 31, 2024 Issuance of common stock - ESPP Issuance of common stock - restricted shares, net of forfeited shares Issuance of stock for 401(k) match Issuance of common stock for contingent consideration Issuance of common stock - equity offering
2024-03-31
2024-01-31 3613.63 未披露
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Common stock offered 5,400,000 shares by the company
2024-02-02
2024-01-30 3073.63 未披露
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From September 30, 2023 to December 31, 2023 Issuance of common stock for 401(k) match Issuance of common stock for contingent consideration
2023-12-31
2023-11-01 3031.85 未披露 定期报告 2023-10-27
2023-11-01 3071.60 未披露
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From June 30, 2023 to September 30, 2023 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match
2023-09-30
2023-08-09 3028.51 未披露 定期报告 2023-08-04
2023-06-28 3026.89 未披露 定期报告 2023-06-15
2023-05-31 2959.54 未披露 定期报告 2023-05-29
2023-05-31 2953.95 未披露
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From March 31, 2022 to March 31, 2023 Issuance of common stock - ESPP Issuance of stock for 401(k) match Issuance of common stock - restricted shares
2023-03-31
2023-02-01 2953.01 未披露 定期报告 2023-01-30
2022-11-01 2923.97 未披露 定期报告 2022-10-28
2022-08-03 2856.62 未披露 定期报告 2022-07-29
2022-06-23 2853.17 未披露 定期报告 2022-06-13
2022-06-23 2853.02 未披露 定期报告 2022-06-07
2022-06-01 2852.06 未披露 定期报告 2022-05-27
2022-06-01 2852.24 未披露
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From March 31, 2021 to March 31, 2022 Issuance of common stock - ESPP Issuance of common stock - Bonus payments Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock - Neeltran acquisition Repurchase of treasury stock
2022-03-31
2022-02-02 2845.77 未披露 定期报告 2022-01-28
2022-02-02 2885.50 未披露
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From September 30, 2021 to December 31, 2021 Issuance of common stock - restricted shares Issuance of stock for 401(k) match
2021-12-31
2021-11-08 2839.54 未披露 定期报告 2021-11-04
2021-11-08 2879.30 未披露
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From June 30, 2021 to September 30, 2021 Issuance of common stock - ESPP Issuance of common stock - bonus payout Issuance of stock for 401(k) match
2021-09-30
2021-08-04 2832.81 未披露 定期报告 2021-07-30
2021-08-04 2872.60 未披露
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From March 31, 2021 to June 30, 2021 Issuance of common stock - bonus payout Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock - Neeltran acquisition
2021-06-30
2021-06-17 2820.99 未披露 定期报告 2021-06-04
2021-06-02 2801.67 未披露 定期报告 2021-05-28
2021-05-21 2790.82 未披露 定期报告 2021-05-06
2021-05-10 2760.67 未披露 定期报告 2021-05-03
2021-06-02 2759.34 未披露
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From March 31, 2020 To March 31, 2021 Exercise of stock options Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock - equity offering Issuance of common stock - NEPSI acquisition
2021-03-31
2021-02-03 2758.16 未披露 定期报告 2021-02-01
2021-02-03 2797.50 未披露
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From September 30, 2020 to December 31, 2020 Issuance of stock for 401(k) match Issuance of common stock - restricted shares, net of forfeitures Issuance of common stock - stock offering Issuance of common stock - NEPSI acquisition Repurchase of treasury stock
2020-12-31
2020-11-04 2760.31 未披露 定期报告 2020-11-02
2020-10-26 2760.42 未披露
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1.Common stock offered by the company 3,670,000 shares. 2.The number of shares of common stock to be outstanding immediately after this offering as shown above is based on 23,934,220 shares outstanding as of June 30, 2020.
2020-10-26
2020-11-04 2345.80 未披露
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From June 30, 2020 to September 30, 2020 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Repurchase of treasury stock
2020-09-30
2020-08-05 2303.50 未披露 定期报告 2020-07-31
2020-10-21 2306.06 未披露
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From March 31, 2020 to June 30, 2020 Issuance of stock for 401(k) match Issuance of common stock - restricted shares
2020-06-30
2020-06-19 2308.20 未披露 定期报告 2020-06-05
2020-06-02 2263.67 未披露 定期报告 2020-05-29
2020-06-02 2260.44 未披露
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From March 31, 2019 to March 31, 2020 Issuance of common stock - ESPP Issuance of stock for 401(k) match Issuance of common stock-warrant exercise Repurchase of treasury stock
2020-03-31
2020-02-05 2255.65 未披露 定期报告 2020-01-31
2020-02-05 2285.50 未披露
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from September 30, 2019 to December 31, 2019 Issuance of stock for 401(k) match Issuance of common stock - warrant exercise
2019-12-31
2019-11-05 2176.55 未披露 定期报告 2019-11-01
2019-11-05 2189.40 未披露
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from June 30, 2019 to September 30, 2019 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock - warrant exercise Repurchase of treasury stock
2019-09-30
2019-08-06 2156.66 未披露 定期报告 2019-08-01
2019-08-06 2185.70 未披露
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From March 31, 2019 to June 30, 2019 Issuance of stock for 401(k) match Issuance of common stock - warrant exercise Repurchase of treasury stock
2019-06-30
2019-06-20 2161.34 未披露 定期报告 2019-06-07
2019-06-20 2145.01 未披露 定期报告 2019-05-31
2019-06-05 2144.95 未披露 定期报告 2019-05-30
2019-06-05 2141.61 未披露
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From March 31, 2018 to March 31, 2019 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Repurchase of treasury stock
2019-03-31
2019-02-05 2141.78 未披露 定期报告 2019-01-31
2018-11-06 2136.41 未披露 定期报告 2018-11-02
2018-07-31 2122.81 未披露 定期报告 2018-07-27
2018-06-06 2097.81 未披露 定期报告 2018-06-01
2018-06-06 2097.36 未披露
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From March 31, 2017 to March 31, 2018 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock-equity offering Issuance of stock in business acquisition Repurchase of treasury stock
2018-03-31
2018-02-05 2093.68 未披露 定期报告 2018-02-01
2017-11-07 2092.51 未披露 定期报告 2017-11-02
2017-10-03 1956.20 未披露 定期报告 2017-09-15
2017-08-08 1919.44 未披露 定期报告 2017-08-03
2017-06-16 1919.17 未披露 定期报告 2017-06-05
2017-05-25 1859.16 未披露 定期报告 2017-05-23
2017-05-25 1461.63 未披露
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from March 31, 2016 to March 31, 2017 Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock-equity offering Repurchase of treasury stock
2017-03-31
2017-02-06 1422.00 未披露 定期报告 2017-02-02
2016-11-02 1419.92 未披露 定期报告 2016-10-28
2016-08-09 1418.86 未披露 定期报告 2016-08-03
2016-06-17 1417.49 未披露 定期报告 2016-06-06
2016-05-31 1404.58 未披露 定期报告 2016-05-25
2016-05-31 1405.56 未披露
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From March 31, 2015 to March 31, 2016 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock-equity offering Repurchase of treasury stock
2016-03-31
2016-02-09 1404.24 未披露 定期报告 2016-02-04
2015-11-03 1400.17 未披露 定期报告 2015-10-29
2015-08-05 1395.36 未披露 定期报告 2015-07-31
2015-06-19 1381.44 未披露 定期报告 2015-06-08
2015-05-28 1386.33 未披露 定期报告 2015-05-22
2015-05-28 959.02 未披露
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from March 31, 2014 to March 31, 2015 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock-ATM, net of costs Issuance of common stock-Hudson Bay Capital Issuance of common stock to settle liabilities Repurchase of treasury stock On March 24, 2015, the Company effected a 1-for-10 reverse stock split of its common stock. Trading of the Company’s common stock reflected the reverse stock split beginning on March 25, 2015
2015-03-31
2015-03-24 957.22 未披露
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The Company’s Board of Directors approved the amendment to the Restated Certificate with a 1-for-10 reverse stock split ratio and abandoned all other amendments to the Restated Certificate previously approved by the Board of Directors and the stockholders.
2015-03-25
2015-02-06 9572.21 未披露 定期报告 2015-01-27
2014-11-06 8650.71 未披露 定期报告 2014-11-03
2014-08-05 8320.72 未披露 定期报告 2014-07-31
2014-06-05 7941.93 未披露 定期报告 2014-06-02
2014-06-05 7887.29 未披露
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from March 31, 2013 to March 31, 2014 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for calendar 2013 401(k) match Issuance of common stock-ATM, net of costs Issuance of common stock to settle liabilities Treasury stock, at cost
2014-03-31
2014-02-06 6813.96 未披露 定期报告 2014-02-03
2013-11-12 6488.65 未披露 定期报告 2013-11-07
2013-11-12 6400.00 未披露 定期报告 2013-09-30
2013-08-07 6312.48 未披露 定期报告 2013-08-01
2013-06-14 6046.33 未披露 定期报告 2013-06-10
2013-06-18 6031.28 未披露 定期报告 2013-06-03
2013-06-14 6030.05 未披露
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From March 31, 2012 to March 31, 2013 Issuance of common stock — ESPP Issuance of common stock — restricted shares Issuance of stock for calendar 2012 401(k) match Issuance of common stock to settle liabilities Treasury stock, at cost
2013-03-31
2013-02-11 5754.01 未披露 定期报告 2013-02-06
2012-11-06 5451.95 未披露 定期报告 2012-10-31
2012-10-01 5498.92 未披露 定期报告 2012-09-27
2012-08-03 5263.16 未披露 定期报告 2012-07-27
2012-06-06 5199.43 未披露 定期报告 2012-05-29
2012-06-06 5196.21 未披露
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from March 31, 2011 to March 31, 2012 Exercise of stock options Issuance of common stock — ESPP Issuance of common stock — restricted shares Issuance of stock for calendar 2011 401(k) match Contingent consideration
2012-03-31
2012-02-09 5146.60 未披露 定期报告 2012-01-31
2011-11-09 5142.11 未披露 定期报告 2011-11-01
2011-09-23 5086.87 未披露 定期报告 2011-09-15
2011-09-23 5071.98 未披露
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from March 31,2010 to March 31,2011 Exercise of stock options Issuance of common stock — ESPP Issuance of common stock — restricted shares Issuance of stock for calendar 2010 401(k) match Issuance of common stock- follow-on public offering, net of costs Contingent consideration
2011-03-31
2011-02-03 5070.17 未披露 定期报告 2011-01-31
2010-11-04 4605.18 未披露 定期报告 2010-11-01
2010-08-05 4555.49 未披露 定期报告 2010-08-02
2010-05-27 4485.18 未披露 定期报告 2010-05-21
2010-05-27 4482.95 未披露
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Exercise of stock options Issuance of common stock — ESPP Issuance of common stock — restricted shares Issuance of stock for calendar 2009 401(k) match Contingent consideration Minority Interest Investment
2010-03-31
2010-02-03 4478.94 未披露 定期报告 2010-01-29
2009-05-28 4341.27 未披露 定期报告 2009-05-22
2009-05-28 4329.76 未披露
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from March 31,2008 to March 31,2009 Exercise of stock options Exercise of warrants Issuance of common stock—ESPP Issuance of common stock—restricted shares Issuance of stock for calendar 2008 401(k) match Contingent consideration
2009-03-31
2008-05-29 4200.04 未披露 定期报告 2008-05-27
2008-05-29 4154.16 未披露
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from March 31,2007 to March 31,2008 Exercise of stock options Exercise of warrants Public offering of common stock Acquisition of Power Quality Systems Issuance of common stock—ESPP Issuance of common stock—restricted shares Issuance of stock for calendar 2007 401(k) match
2008-03-31
2007-06-14 3567.44 未披露 定期报告 2007-06-12
2007-06-14 3501.61 未披露
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from March 31,2006 to March 31,2007 Exercise of stock options Acquisition of Windtec Issuance of common stock — ESPP Issuance of common stock — restricted shares Issuance of stock for calendar 2006 401(k) match
2007-03-31
2006-06-14 3301.82 未披露 定期报告 2006-06-07
2006-06-14 3289.03 未披露
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from March 31,2005 to March 31,2006 Exercise of stock options Issuance of common stock — ESPP Deferred compensation Issuance of stock for calendar 2004 & calendar 2005 401(k) match and 2006 employee stock awards
2006-03-31
2005-06-14 3257.96 未披露 定期报告 2005-06-08
2005-06-14 3254.52 未披露
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from March 31,2004 to March 31,2005 Exercise of stock options Public offering of common stock Issuance of common stock—ESPP Deferred compensation Employee stock awards
2005-03-31
2004-06-14 2772.43 未披露 定期报告 2004-06-09
2004-06-14 2761.41 未披露
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from March 31,2003 to March 31,2004 Exercise of stock options Secondary public offering of common stock Issuance of common stock—ESPP Issuance of common stock to IRL Deferred Compensation Stock compensation expense
2004-03-31
2003-06-30 2134.37 未披露 定期报告 2003-06-20
2003-06-30 2129.38 未披露
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from March 31,2002 to March 31,2003 Issuance of common stock — ESPP Purchase of NST Issuance of common stock to Pirelli Deferred Compensation Stock compensation expense
2003-03-31
2002-06-25 2053.65 未披露 定期报告 2002-04-30
2002-06-25 2049.75 未披露
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from March 31,2001 to March 31,2002 Exercise of stock options Issuance of common stock — ESPP Stock compensation expense
2002-03-31
2001-06-27 2028.02 未披露 定期报告 2001-04-30
2001-06-27 2029.06 未披露
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from March 31,2000 to March 31,2001 Exercise of stock options Purchase of IE Exercise of stock warrants Stock compensation expense
2001-03-31
2000-06-27 1982.15 未披露 定期报告 2000-04-30
2000-06-27 1973.47 未披露
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from March 31,1999 to March 31,2000 Exercise of stock options Secondary public offering of common stock Exercise of stock warrants Deferred compensation Stock compensation expense
2000-03-31
1999-06-25 1537.98 未披露 定期报告 1999-04-30
1999-06-25 1537.87 未披露
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from March 31,1998 to March 31,1999 Exercise of stock options Secondary public offering of common stock Stock compensation expense
1999-03-31
1998-06-26 1527.29 未披露 定期报告 1998-04-30
1998-06-26 1175.68 未披露
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from March 31,1997 to March 31,1998 Exercise of stock options Investment by EDF Merger with AET Stock compensation expense Exercise of warrants
1998-03-31
1997-06-30 1157.53 未披露 定期报告 1997-06-20
1997-06-30 1050.51 未披露
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from March 31,1996 to March 31,1997 Exercise of stock options
1997-03-31
1997-06-30 1042.30 未披露
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from March 31,1995 to March 31,1996 Exercise of warrants Exercise of stock options Purchase of fractional shares
1996-03-31
From June 30, 2025 to September 30, 2025 Exercise of stock options Issuance of common stock - restricted shares, net of forfeited shares Issuance of common stock - ESPP Issuance of common stock for 401(k) match
From March 31, 2025 to June 30, 2025 Issuance of common stock – restricted shares, net of forfeited shares Issuance of common stock - equity offering, net of offering expenses Issuance of common stock for 401(k) match
Common stock offered 4,125,000 shares by the company
From March 31, 2024 to March 31, 2025 Issuance of stock for 401(k) match Repurchase of treasury stock Issuance of common stock - ESPP Issuance of common stock - restricted shares, net of forfeited shares Issuance of common stock to settle contingent consideration Issuance of common stock - NWL acquisition, net of offering expenses
From September 30, 2024 to December 31, 2024 Issuance of common stock for 401(k) match Issuance of common stock – restricted shares
From June 30, 2024 to September 30, 2024 Issuance of common stock – ESPP Issuance of common stock - restricted shares Issuance of common stock for 401(k) match Issuance of common stock - Megatran acquisition, net of offering expenses Issuance of common stock to settle contingent consideration
From March 31, 2023 to March 31, 2024 Issuance of common stock - ESPP Issuance of common stock - restricted shares, net of forfeited shares Issuance of stock for 401(k) match Issuance of common stock for contingent consideration Issuance of common stock - equity offering
Common stock offered 5,400,000 shares by the company
From September 30, 2023 to December 31, 2023 Issuance of common stock for 401(k) match Issuance of common stock for contingent consideration
From June 30, 2023 to September 30, 2023 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match
From March 31, 2022 to March 31, 2023 Issuance of common stock - ESPP Issuance of stock for 401(k) match Issuance of common stock - restricted shares
From March 31, 2021 to March 31, 2022 Issuance of common stock - ESPP Issuance of common stock - Bonus payments Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock - Neeltran acquisition Repurchase of treasury stock
From September 30, 2021 to December 31, 2021 Issuance of common stock - restricted shares Issuance of stock for 401(k) match
From June 30, 2021 to September 30, 2021 Issuance of common stock - ESPP Issuance of common stock - bonus payout Issuance of stock for 401(k) match
From March 31, 2021 to June 30, 2021 Issuance of common stock - bonus payout Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock - Neeltran acquisition
From March 31, 2020 To March 31, 2021 Exercise of stock options Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock - equity offering Issuance of common stock - NEPSI acquisition
From September 30, 2020 to December 31, 2020 Issuance of stock for 401(k) match Issuance of common stock - restricted shares, net of forfeitures Issuance of common stock - stock offering Issuance of common stock - NEPSI acquisition Repurchase of treasury stock
1.Common stock offered by the company 3,670,000 shares. 2.The number of shares of common stock to be outstanding immediately after this offering as shown above is based on 23,934,220 shares outstanding as of June 30, 2020.
From June 30, 2020 to September 30, 2020 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Repurchase of treasury stock
From March 31, 2020 to June 30, 2020 Issuance of stock for 401(k) match Issuance of common stock - restricted shares
From March 31, 2019 to March 31, 2020 Issuance of common stock - ESPP Issuance of stock for 401(k) match Issuance of common stock-warrant exercise Repurchase of treasury stock
from September 30, 2019 to December 31, 2019 Issuance of stock for 401(k) match Issuance of common stock - warrant exercise
from June 30, 2019 to September 30, 2019 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock - warrant exercise Repurchase of treasury stock
From March 31, 2019 to June 30, 2019 Issuance of stock for 401(k) match Issuance of common stock - warrant exercise Repurchase of treasury stock
From March 31, 2018 to March 31, 2019 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Repurchase of treasury stock
From March 31, 2017 to March 31, 2018 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock-equity offering Issuance of stock in business acquisition Repurchase of treasury stock
from March 31, 2016 to March 31, 2017 Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock-equity offering Repurchase of treasury stock
From March 31, 2015 to March 31, 2016 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock-equity offering Repurchase of treasury stock
from March 31, 2014 to March 31, 2015 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for 401(k) match Issuance of common stock-ATM, net of costs Issuance of common stock-Hudson Bay Capital Issuance of common stock to settle liabilities Repurchase of treasury stock On March 24, 2015, the Company effected a 1-for-10 reverse stock split of its common stock. Trading of the Company’s common stock reflected the reverse stock split beginning on March 25, 2015
The Company’s Board of Directors approved the amendment to the Restated Certificate with a 1-for-10 reverse stock split ratio and abandoned all other amendments to the Restated Certificate previously approved by the Board of Directors and the stockholders.
from March 31, 2013 to March 31, 2014 Issuance of common stock - ESPP Issuance of common stock - restricted shares Issuance of stock for calendar 2013 401(k) match Issuance of common stock-ATM, net of costs Issuance of common stock to settle liabilities Treasury stock, at cost
From March 31, 2012 to March 31, 2013 Issuance of common stock — ESPP Issuance of common stock — restricted shares Issuance of stock for calendar 2012 401(k) match Issuance of common stock to settle liabilities Treasury stock, at cost
from March 31, 2011 to March 31, 2012 Exercise of stock options Issuance of common stock — ESPP Issuance of common stock — restricted shares Issuance of stock for calendar 2011 401(k) match Contingent consideration
from March 31,2010 to March 31,2011 Exercise of stock options Issuance of common stock — ESPP Issuance of common stock — restricted shares Issuance of stock for calendar 2010 401(k) match Issuance of common stock- follow-on public offering, net of costs Contingent consideration
Exercise of stock options Issuance of common stock — ESPP Issuance of common stock — restricted shares Issuance of stock for calendar 2009 401(k) match Contingent consideration Minority Interest Investment
from March 31,2008 to March 31,2009 Exercise of stock options Exercise of warrants Issuance of common stock—ESPP Issuance of common stock—restricted shares Issuance of stock for calendar 2008 401(k) match Contingent consideration
from March 31,2007 to March 31,2008 Exercise of stock options Exercise of warrants Public offering of common stock Acquisition of Power Quality Systems Issuance of common stock—ESPP Issuance of common stock—restricted shares Issuance of stock for calendar 2007 401(k) match
from March 31,2006 to March 31,2007 Exercise of stock options Acquisition of Windtec Issuance of common stock — ESPP Issuance of common stock — restricted shares Issuance of stock for calendar 2006 401(k) match
from March 31,2005 to March 31,2006 Exercise of stock options Issuance of common stock — ESPP Deferred compensation Issuance of stock for calendar 2004 & calendar 2005 401(k) match and 2006 employee stock awards
from March 31,2004 to March 31,2005 Exercise of stock options Public offering of common stock Issuance of common stock—ESPP Deferred compensation Employee stock awards
from March 31,2003 to March 31,2004 Exercise of stock options Secondary public offering of common stock Issuance of common stock—ESPP Issuance of common stock to IRL Deferred Compensation Stock compensation expense
from March 31,2002 to March 31,2003 Issuance of common stock — ESPP Purchase of NST Issuance of common stock to Pirelli Deferred Compensation Stock compensation expense
from March 31,2001 to March 31,2002 Exercise of stock options Issuance of common stock — ESPP Stock compensation expense
from March 31,2000 to March 31,2001 Exercise of stock options Purchase of IE Exercise of stock warrants Stock compensation expense
from March 31,1999 to March 31,2000 Exercise of stock options Secondary public offering of common stock Exercise of stock warrants Deferred compensation Stock compensation expense
from March 31,1998 to March 31,1999 Exercise of stock options Secondary public offering of common stock Stock compensation expense
from March 31,1997 to March 31,1998 Exercise of stock options Investment by EDF Merger with AET Stock compensation expense Exercise of warrants
from March 31,1996 to March 31,1997 Exercise of stock options
from March 31,1995 to March 31,1996 Exercise of warrants Exercise of stock options Purchase of fractional shares
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