NASDAQ:AMSC | Historical Stock Price | AMERICAN SUPERCONDUCTOR CORP /DE/

Complete retained daily price history on its own workbook tab. Split-adjusted close keeps every historical share price on one comparable split basis. Cumulative dividend-reinvested close is the daily close of a rebased total-return index: it starts with one share at the earliest retained close, reinvests every distribution, and normalizes every forward and reverse split exactly once. Admitted exchange opening prices remain a distinct current-session series.

Available history
1991-12-12 to 2026-09-04
Data captured

Stock Price Chart

Blue: Split-adjusted close · Orange: Cumulative dividend-reinvested close

$3.07$8.94$26.03$75.81$220.81$643.121991-12-122026-08-27

Logarithmic scale. Both lines share the same starting value for the selected range.

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Historical Stock Price — 2010

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2010-12-31$285.90$285.9045,770
2010-12-30$286.60$286.6058,310
2010-12-29$285.50$285.5049,910
2010-12-28$283.60$283.6045,240
2010-12-27$288.50$288.5039,040
2010-12-23$287.40$287.4060,460
2010-12-22$285.70$285.7067,750
2010-12-21$294.10$294.1084,680
2010-12-20$288.70$288.70120,440
2010-12-17$291.20$291.20254,410
2010-12-16$281.90$281.90210,790
2010-12-15$296.20$296.2090,380
2010-12-14$309.20$309.20118,910
2010-12-13$307.20$307.20306,420
2010-12-10$334.80$334.8047,530
2010-12-09$333.50$333.5051,780
2010-12-08$330.80$330.8046,030
2010-12-07$327.70$327.7059,420
2010-12-06$333.70$333.7039,710
2010-12-03$333.60$333.6051,030
2010-12-02$334.60$334.6050,990
2010-12-01$336.80$336.8050,480
2010-11-30$332.80$332.8077,480
2010-11-29$333.20$333.2076,510
2010-11-26$338.40$338.4014,140
2010-11-24$341.80$341.8042,710
2010-11-23$335.90$335.9072,430
2010-11-22$337.30$337.3063,900
2010-11-19$331.80$331.8054,880
2010-11-18$332.40$332.4059,160
2010-11-17$325.10$325.1084,090
2010-11-16$324.90$324.90136,090
2010-11-15$344.70$344.7060,940
2010-11-12$344.80$344.80170,910
2010-11-11$354.80$354.80387,290
2010-11-10$369.10$369.1068,490
2010-11-09$361.10$361.1088,280
2010-11-08$372.40$372.4042,370
2010-11-05$369.90$369.9049,730
2010-11-04$369.50$369.50127,450
2010-11-03$361.50$361.50134,690
2010-11-02$365.60$365.60199,870
2010-11-01$325.00$325.00115,550
2010-10-29$336.50$336.5075,680
2010-10-28$342.90$342.9053,260
2010-10-27$347.10$347.1062,360
2010-10-26$350.80$350.8045,370
2010-10-25$350.20$350.2044,670
2010-10-22$346.30$346.3034,310
2010-10-21$345.40$345.4056,340
2010-10-20$345.70$345.7063,930
2010-10-19$343.10$343.10106,400
2010-10-18$356.60$356.6057,730
2010-10-15$360.00$360.00237,600
2010-10-14$374.80$374.8093,680
2010-10-13$380.90$380.9086,310
2010-10-12$380.50$380.50154,040
2010-10-11$365.00$365.0081,130
2010-10-08$363.90$363.90114,510
2010-10-07$351.90$351.9075,790
2010-10-06$353.90$353.90220,850
2010-10-05$334.60$334.6089,170
2010-10-04$318.80$318.8074,800
2010-10-01$314.60$314.6068,950
2010-09-30$311.00$311.0087,110
2010-09-29$309.40$309.4052,660
2010-09-28$305.20$305.2050,760
2010-09-27$302.20$302.2041,470
2010-09-24$306.20$306.2037,350
2010-09-23$297.60$297.6041,380
2010-09-22$300.30$300.3034,530
2010-09-21$304.30$304.3058,250
2010-09-20$304.10$304.1085,440
2010-09-17$289.60$289.60130,540
2010-09-16$289.60$289.6036,600
2010-09-15$289.50$289.5033,920
2010-09-14$290.70$290.7046,530
2010-09-13$294.50$294.5038,460
2010-09-10$290.50$290.5043,020
2010-09-09$295.90$295.9046,380
2010-09-08$290.80$290.8042,160
2010-09-07$285.90$285.9036,640
2010-09-03$293.90$293.9047,940
2010-09-02$284.10$284.1055,870
2010-09-01$278.70$278.7046,520
2010-08-31$268.10$268.1031,290
2010-08-30$270.40$270.4030,970
2010-08-27$279.80$279.8034,300
2010-08-26$267.20$267.2034,140
2010-08-25$272.70$272.7024,880
2010-08-24$267.40$267.4040,480
2010-08-23$268.00$268.0034,480
2010-08-20$272.40$272.4042,890
2010-08-19$272.50$272.5044,570
2010-08-18$284.10$284.1034,250
2010-08-17$285.20$285.2044,160
2010-08-16$275.20$275.2028,340
2010-08-13$274.00$274.0028,910
2010-08-12$281.50$281.5036,000
2010-08-11$283.80$283.8051,150
2010-08-10$296.60$296.6052,750
2010-08-09$302.90$302.9041,840
2010-08-06$300.70$300.7032,680
2010-08-05$305.80$305.8047,510
2010-08-04$302.20$302.2043,460
2010-08-03$301.70$301.7052,500
2010-08-02$304.10$304.1063,590
2010-07-30$301.50$301.5073,850
2010-07-29$305.50$305.50124,560
2010-07-28$327.20$327.2064,610
2010-07-27$322.80$322.8074,330
2010-07-26$325.30$325.3067,990
2010-07-23$314.30$314.3046,280
2010-07-22$306.10$306.1068,110
2010-07-21$284.60$284.6029,290
2010-07-20$291.70$291.7036,710
2010-07-19$283.40$283.4033,140
2010-07-16$281.70$281.7036,960
2010-07-15$294.50$294.5038,190
2010-07-14$294.60$294.6033,220
2010-07-13$294.00$294.0045,200
2010-07-12$282.50$282.5040,510
2010-07-09$285.90$285.9037,730
2010-07-08$284.10$284.1037,400
2010-07-07$278.30$278.3060,680
2010-07-06$266.80$266.8045,030
2010-07-02$268.40$268.4026,650
2010-07-01$270.00$270.0069,520
2010-06-30$266.90$266.9050,790
2010-06-29$270.80$270.8070,390
2010-06-28$285.50$285.5033,770
2010-06-25$292.60$292.6045,610
2010-06-24$291.80$291.8044,330
2010-06-23$303.00$303.0051,080
2010-06-22$300.30$300.3050,210
2010-06-21$314.70$314.7081,840
2010-06-18$309.30$309.3064,650
2010-06-17$312.20$312.2037,710
2010-06-16$309.50$309.5065,290
2010-06-15$314.70$314.7066,520
2010-06-14$304.90$304.9075,100
2010-06-11$294.10$294.1040,290
2010-06-10$292.50$292.5061,350
2010-06-09$279.20$279.2067,770
2010-06-08$279.10$279.10103,010
2010-06-07$288.10$288.1057,430
2010-06-04$295.10$295.1067,090
2010-06-03$311.80$311.8053,860
2010-06-02$310.30$310.3070,310
2010-06-01$301.60$301.6079,540
2010-05-28$306.60$306.6088,350
2010-05-27$318.40$318.4097,020
2010-05-26$293.60$293.6092,060
2010-05-25$295.70$295.70114,080
2010-05-24$287.30$287.3088,890
2010-05-21$290.50$290.50126,440
2010-05-20$285.80$285.80167,550
2010-05-19$308.90$308.90140,610
2010-05-18$317.40$317.40150,980
2010-05-17$333.90$333.90280,140
2010-05-14$309.60$309.60177,300
2010-05-13$307.70$307.70219,010
2010-05-12$292.40$292.40120,220
2010-05-11$274.40$274.4086,650
2010-05-10$273.00$273.00126,800
2010-05-07$250.50$250.50122,710
2010-05-06$258.40$258.40140,480
2010-05-05$274.60$274.6073,320
2010-05-04$277.90$277.90101,520
2010-05-03$298.70$298.7049,470
2010-04-30$291.80$291.8058,010
2010-04-29$306.70$306.7087,380
2010-04-28$295.30$295.3080,310
2010-04-27$296.00$296.0082,830
2010-04-26$309.10$309.1053,700
2010-04-23$317.00$317.0051,160
2010-04-22$319.50$319.5077,320
2010-04-21$305.50$305.5094,510
2010-04-20$306.10$306.1090,970
2010-04-19$296.90$296.90125,870
2010-04-16$304.10$304.10161,220
2010-04-15$318.90$318.90272,650
2010-04-14$290.60$290.60131,150
2010-04-13$285.90$285.9067,330
2010-04-12$283.90$283.9067,000
2010-04-09$289.70$289.7048,060
2010-04-08$293.60$293.6056,540
2010-04-07$291.20$291.2059,580
2010-04-06$293.20$293.2080,290
2010-04-05$288.20$288.20143,560
2010-04-01$292.70$292.70147,720
2010-03-31$289.00$289.00162,050
2010-03-30$278.50$278.5075,550
2010-03-29$275.30$275.3087,050
2010-03-26$278.60$278.6066,800
2010-03-25$278.30$278.30101,080
2010-03-24$281.50$281.50191,520
2010-03-23$284.00$284.00241,620
2010-03-22$261.40$261.40115,520
2010-03-19$254.40$254.40146,090
2010-03-18$261.80$261.80128,010
2010-03-17$260.40$260.40268,650
2010-03-16$258.70$258.70518,270
2010-03-15$281.40$281.40165,720
2010-03-12$302.00$302.0088,530
2010-03-11$296.30$296.3058,280
2010-03-10$298.20$298.2049,470
2010-03-09$301.40$301.4069,270
2010-03-08$300.20$300.2067,550
2010-03-05$309.50$309.5076,020
2010-03-04$304.70$304.7097,970
2010-03-03$300.50$300.50126,450
2010-03-02$289.90$289.90106,030
2010-03-01$288.80$288.80128,810
2010-02-26$280.00$280.0062,360
2010-02-25$282.60$282.6080,450
2010-02-24$283.50$283.5086,330
2010-02-23$278.20$278.20211,520
2010-02-22$293.00$293.00254,960
2010-02-19$314.90$314.9089,070
2010-02-18$321.10$321.1057,690
2010-02-17$317.70$317.7051,330
2010-02-16$319.20$319.2051,430
2010-02-12$318.80$318.8075,830
2010-02-11$324.30$324.30107,990
2010-02-10$317.00$317.00143,950
2010-02-09$311.40$311.40118,500
2010-02-08$308.80$308.80140,720
2010-02-05$318.20$318.20175,070
2010-02-04$320.90$320.90211,970
2010-02-03$338.30$338.30433,040
2010-02-02$356.90$356.90424,350
2010-02-01$397.50$397.50134,950
2010-01-29$380.20$380.2081,060
2010-01-28$382.00$382.0085,460
2010-01-27$392.20$392.2088,740
2010-01-26$390.30$390.30134,260
2010-01-25$371.70$371.7080,070
2010-01-22$365.40$365.4098,640
2010-01-21$380.40$380.40163,020
2010-01-20$397.50$397.5063,190
2010-01-19$410.00$410.0071,400
2010-01-15$404.20$404.20145,400
2010-01-14$416.60$416.6059,580
2010-01-13$427.70$427.7045,650
2010-01-12$430.40$430.4074,510
2010-01-11$431.10$431.1037,440
2010-01-08$434.20$434.2089,660
2010-01-07$431.70$431.7060,250
2010-01-06$428.70$428.7087,960
2010-01-05$425.20$425.20106,840
2010-01-04$421.50$421.5086,230