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 — 2009

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2009-12-31$409.00$409.0043,930
2009-12-30$414.00$414.00117,470
2009-12-29$419.90$419.9072,960
2009-12-28$428.00$428.0054,980
2009-12-24$426.70$426.7023,430
2009-12-23$423.70$423.7058,310
2009-12-22$419.30$419.3075,300
2009-12-21$418.90$418.90104,680
2009-12-18$402.70$402.70135,130
2009-12-17$394.60$394.6077,180
2009-12-16$400.70$400.70168,840
2009-12-15$401.30$401.30126,130
2009-12-14$390.90$390.9068,140
2009-12-11$386.90$386.90102,570
2009-12-10$391.30$391.30241,830
2009-12-09$381.70$381.70236,830
2009-12-08$355.20$355.20135,250
2009-12-07$344.80$344.8043,710
2009-12-04$344.80$344.8057,900
2009-12-03$342.30$342.3075,540
2009-12-02$342.30$342.3053,970
2009-12-01$343.60$343.6099,260
2009-11-30$332.00$332.0065,810
2009-11-27$327.80$327.8038,630
2009-11-25$334.30$334.3047,120
2009-11-24$336.00$336.0068,160
2009-11-23$340.30$340.30122,650
2009-11-20$326.30$326.30138,750
2009-11-19$330.20$330.20182,050
2009-11-18$324.90$324.90102,280
2009-11-17$317.80$317.8057,960
2009-11-16$321.70$321.70142,650
2009-11-13$310.00$310.0089,610
2009-11-12$307.60$307.6079,300
2009-11-11$322.20$322.2069,700
2009-11-10$321.40$321.4074,760
2009-11-09$330.00$330.00109,970
2009-11-06$318.80$318.80119,660
2009-11-05$325.20$325.20115,070
2009-11-04$317.60$317.60108,160
2009-11-03$326.20$326.20176,620
2009-11-02$325.00$325.00159,150
2009-10-30$335.20$335.20230,920
2009-10-29$353.40$353.40406,150
2009-10-28$288.40$288.40126,800
2009-10-27$310.00$310.00111,270
2009-10-26$313.50$313.50105,600
2009-10-23$308.10$308.1067,790
2009-10-22$316.70$316.7054,560
2009-10-21$314.20$314.2070,120
2009-10-20$316.80$316.8049,080
2009-10-19$323.60$323.6067,600
2009-10-16$323.20$323.2059,010
2009-10-15$334.90$334.9066,130
2009-10-14$338.70$338.7093,350
2009-10-13$332.20$332.20101,870
2009-10-12$326.90$326.9090,730
2009-10-09$332.10$332.10148,630
2009-10-08$313.70$313.7068,570
2009-10-07$312.90$312.9041,300
2009-10-06$314.30$314.3085,820
2009-10-05$309.50$309.5067,990
2009-10-02$307.00$307.00124,430
2009-10-01$318.10$318.10119,400
2009-09-30$335.40$335.40305,850
2009-09-29$303.60$303.6079,490
2009-09-28$307.80$307.8073,820
2009-09-25$304.40$304.4092,800
2009-09-24$297.30$297.30177,680
2009-09-23$309.40$309.40141,840
2009-09-22$310.90$310.90231,660
2009-09-21$327.00$327.00238,800
2009-09-18$371.90$371.90104,400
2009-09-17$367.90$367.90198,550
2009-09-16$352.00$352.0041,670
2009-09-15$341.40$341.4048,940
2009-09-14$339.10$339.1039,110
2009-09-11$343.60$343.6093,830
2009-09-10$352.20$352.20140,280
2009-09-09$334.80$334.80128,140
2009-09-08$326.10$326.10128,080
2009-09-04$309.90$309.9043,260
2009-09-03$307.50$307.5047,750
2009-09-02$305.80$305.8064,070
2009-09-01$307.10$307.1092,650
2009-08-31$323.10$323.1064,320
2009-08-28$333.20$333.2053,020
2009-08-27$330.60$330.6075,540
2009-08-26$339.80$339.8087,030
2009-08-25$330.00$330.0063,320
2009-08-24$323.20$323.2081,720
2009-08-21$330.40$330.4055,890
2009-08-20$324.30$324.3053,980
2009-08-19$319.20$319.2064,250
2009-08-18$314.60$314.60114,640
2009-08-17$296.70$296.7093,870
2009-08-14$319.60$319.6054,300
2009-08-13$332.60$332.6051,140
2009-08-12$335.90$335.9050,130
2009-08-11$327.70$327.7084,030
2009-08-10$340.40$340.4082,920
2009-08-07$342.80$342.80138,200
2009-08-06$331.70$331.7098,920
2009-08-05$320.00$320.0074,420
2009-08-04$326.70$326.7080,250
2009-08-03$329.00$329.0078,880
2009-07-31$321.70$321.70185,680
2009-07-30$321.30$321.30712,310
2009-07-29$262.80$262.8087,270
2009-07-28$268.60$268.6067,040
2009-07-27$275.60$275.6080,900
2009-07-24$268.40$268.4065,190
2009-07-23$263.80$263.8055,410
2009-07-22$253.80$253.8044,870
2009-07-21$253.60$253.6041,970
2009-07-20$256.30$256.3058,990
2009-07-17$248.20$248.2059,580
2009-07-16$249.10$249.1065,640
2009-07-15$240.60$240.6057,410
2009-07-14$231.40$231.4048,790
2009-07-13$228.70$228.7049,770
2009-07-10$221.80$221.8057,260
2009-07-09$213.40$213.40119,010
2009-07-08$219.80$219.80106,180
2009-07-07$229.00$229.0049,190
2009-07-06$242.30$242.3049,510
2009-07-02$254.70$254.7034,970
2009-07-01$261.20$261.2069,400
2009-06-30$262.50$262.5066,860
2009-06-29$261.40$261.4091,850
2009-06-26$258.10$258.1073,850
2009-06-25$253.90$253.9046,100
2009-06-24$249.30$249.3067,840
2009-06-23$247.30$247.3069,190
2009-06-22$242.80$242.8079,160
2009-06-19$264.70$264.70123,470
2009-06-18$251.30$251.3058,080
2009-06-17$248.00$248.0047,630
2009-06-16$250.90$250.9057,700
2009-06-15$258.40$258.4068,460
2009-06-12$277.90$277.9041,580
2009-06-11$276.70$276.7051,900
2009-06-10$270.50$270.5049,760
2009-06-09$272.10$272.1057,210
2009-06-08$260.10$260.1059,470
2009-06-05$270.90$270.9031,730
2009-06-04$273.90$273.9053,440
2009-06-03$265.40$265.40121,910
2009-06-02$290.80$290.8064,840
2009-06-01$293.50$293.5088,410
2009-05-29$278.30$278.3088,040
2009-05-28$261.50$261.5053,300
2009-05-27$264.70$264.7077,950
2009-05-26$250.60$250.6048,860
2009-05-22$232.20$232.2030,070
2009-05-21$238.50$238.5056,210
2009-05-20$251.20$251.2057,790
2009-05-19$249.90$249.9057,440
2009-05-18$241.30$241.3066,400
2009-05-15$228.60$228.60109,220
2009-05-14$232.10$232.10265,240
2009-05-13$244.40$244.4071,680
2009-05-12$252.90$252.9083,600
2009-05-11$255.00$255.0084,770
2009-05-08$250.60$250.60101,860
2009-05-07$238.30$238.30158,530
2009-05-06$276.70$276.7070,580
2009-05-05$281.90$281.90120,650
2009-05-04$295.60$295.60161,760
2009-05-01$268.50$268.50115,270
2009-04-30$257.00$257.00113,590
2009-04-29$258.30$258.3098,360
2009-04-28$252.30$252.30155,920
2009-04-27$249.10$249.10109,360
2009-04-24$248.40$248.40131,000
2009-04-23$240.40$240.40112,070
2009-04-22$236.10$236.10155,400
2009-04-21$214.30$214.30115,020
2009-04-20$215.50$215.50211,170
2009-04-17$204.40$204.40104,150
2009-04-16$193.60$193.6047,060
2009-04-15$185.70$185.7027,100
2009-04-14$182.50$182.5042,270
2009-04-13$192.20$192.2034,550
2009-04-09$191.50$191.5045,960
2009-04-08$180.60$180.6045,950
2009-04-07$172.40$172.4053,030
2009-04-06$189.80$189.8031,760
2009-04-03$195.80$195.8042,590
2009-04-02$194.80$194.8098,040
2009-04-01$180.00$180.0046,180
2009-03-31$173.10$173.1072,810
2009-03-30$164.70$164.7049,920
2009-03-27$171.00$171.0066,100
2009-03-26$186.50$186.50112,190
2009-03-25$167.90$167.9048,670
2009-03-24$159.10$159.1041,210
2009-03-23$168.40$168.4054,740
2009-03-20$154.80$154.8073,870
2009-03-19$169.20$169.2060,580
2009-03-18$171.00$171.0039,020
2009-03-17$165.40$165.4046,600
2009-03-16$161.90$161.9050,390
2009-03-13$165.00$165.0046,800
2009-03-12$165.50$165.5048,000
2009-03-11$160.10$160.1081,640
2009-03-10$152.90$152.9079,480
2009-03-09$132.80$132.8047,690
2009-03-06$134.50$134.5037,590
2009-03-05$132.80$132.8059,950
2009-03-04$145.70$145.70102,640
2009-03-03$129.40$129.4082,280
2009-03-02$123.10$123.10131,540
2009-02-27$134.60$134.6097,670
2009-02-26$149.70$149.7028,580
2009-02-25$151.90$151.9047,690
2009-02-24$161.70$161.7051,060
2009-02-23$150.40$150.4049,550
2009-02-20$168.80$168.8067,690
2009-02-19$171.00$171.0079,980
2009-02-18$181.70$181.7038,700
2009-02-17$182.00$182.0080,110
2009-02-13$187.00$187.0050,970
2009-02-12$183.40$183.4038,660
2009-02-11$180.40$180.4037,970
2009-02-10$177.70$177.7049,030
2009-02-09$185.50$185.5061,240
2009-02-06$182.10$182.1093,060
2009-02-05$169.10$169.1067,640
2009-02-04$161.40$161.4063,470
2009-02-03$165.60$165.60115,270
2009-02-02$159.80$159.80111,610
2009-01-30$161.80$161.8053,870
2009-01-29$168.00$168.0052,820
2009-01-28$169.50$169.5060,440
2009-01-27$163.70$163.7034,960
2009-01-26$160.60$160.6048,070
2009-01-23$155.00$155.0076,950
2009-01-22$154.10$154.1080,820
2009-01-21$164.00$164.00159,140
2009-01-20$171.90$171.9092,960
2009-01-16$171.80$171.80128,000
2009-01-15$166.80$166.8082,770
2009-01-14$150.90$150.9063,870
2009-01-13$166.00$166.0058,150
2009-01-12$159.00$159.0046,320
2009-01-09$174.10$174.1028,380
2009-01-08$181.00$181.0067,300
2009-01-07$177.80$177.8048,790
2009-01-06$187.00$187.0075,870
2009-01-05$174.50$174.5071,250
2009-01-02$171.50$171.5039,520