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 — 1999

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1999-12-31$280.00$280.007,460
1999-12-30$273.13$273.1316,730
1999-12-29$277.50$277.5028,720
1999-12-28$270.00$270.0041,770
1999-12-27$232.50$232.5010,760
1999-12-23$235.00$235.004,520
1999-12-22$246.25$246.256,790
1999-12-21$243.75$243.757,530
1999-12-20$232.50$232.5023,430
1999-12-17$237.50$237.5048,650
1999-12-16$245.63$245.6342,760
1999-12-15$213.75$213.7539,150
1999-12-14$197.50$197.5020,650
1999-12-13$195.00$195.0013,810
1999-12-10$180.00$180.006,450
1999-12-09$183.75$183.755,900
1999-12-08$193.75$193.759,440
1999-12-07$195.00$195.0014,690
1999-12-06$196.25$196.254,440
1999-12-03$193.13$193.138,590
1999-12-02$195.00$195.004,900
1999-12-01$195.00$195.0010,670
1999-11-30$190.00$190.007,210
1999-11-29$196.25$196.258,630
1999-11-26$197.50$197.504,340
1999-11-24$192.50$192.5011,700
1999-11-23$196.25$196.254,340
1999-11-22$195.00$195.005,420
1999-11-19$202.50$202.5018,200
1999-11-18$201.25$201.2513,860
1999-11-17$201.25$201.2538,640
1999-11-16$200.00$200.0017,570
1999-11-15$191.25$191.2512,400
1999-11-12$191.88$191.889,650
1999-11-11$191.25$191.256,250
1999-11-10$193.13$193.1314,660
1999-11-09$188.75$188.7512,720
1999-11-08$192.50$192.508,320
1999-11-05$193.75$193.7510,180
1999-11-04$193.75$193.7521,010
1999-11-03$201.88$201.8814,040
1999-11-02$196.25$196.2532,460
1999-11-01$188.75$188.7519,960
1999-10-29$178.13$178.138,850
1999-10-28$184.38$184.3810,230
1999-10-27$183.75$183.7529,890
1999-10-26$171.25$171.256,130
1999-10-25$167.50$167.503,710
1999-10-22$165.63$165.637,100
1999-10-21$161.25$161.254,840
1999-10-20$160.00$160.009,400
1999-10-19$161.25$161.256,930
1999-10-18$160.00$160.006,770
1999-10-15$159.38$159.3816,200
1999-10-14$170.00$170.009,630
1999-10-13$173.75$173.7511,130
1999-10-12$177.50$177.5021,380
1999-10-11$180.00$180.0031,010
1999-10-08$165.00$165.009,880
1999-10-07$165.63$165.639,610
1999-10-06$168.13$168.1320,670
1999-10-05$166.25$166.2513,690
1999-10-04$165.63$165.6319,640
1999-10-01$163.75$163.7511,090
1999-09-30$153.75$153.7529,240
1999-09-29$152.50$152.5027,110
1999-09-28$133.75$133.754,290
1999-09-27$135.00$135.002,060
1999-09-24$128.75$128.753,390
1999-09-23$130.00$130.004,920
1999-09-22$130.00$130.00530
1999-09-21$130.00$130.002,170
1999-09-20$130.00$130.007,700
1999-09-17$129.38$129.383,020
1999-09-16$130.00$130.002,420
1999-09-15$130.00$130.004,220
1999-09-14$130.00$130.004,800
1999-09-13$133.75$133.75900
1999-09-10$137.50$137.506,930
1999-09-09$131.25$131.256,210
1999-09-08$125.00$125.002,000
1999-09-07$121.25$121.253,540
1999-09-03$125.00$125.002,370
1999-09-02$121.25$121.252,130
1999-09-01$126.25$126.251,090
1999-08-31$121.25$121.253,580
1999-08-30$126.25$126.253,050
1999-08-27$131.25$131.251,160
1999-08-26$128.75$128.752,800
1999-08-25$129.69$129.692,930
1999-08-24$130.63$130.631,370
1999-08-23$132.50$132.501,660
1999-08-20$133.75$133.752,280
1999-08-19$130.00$130.00710
1999-08-18$129.38$129.384,320
1999-08-17$130.63$130.632,530
1999-08-16$130.63$130.63940
1999-08-13$133.13$133.131,560
1999-08-12$135.00$135.001,340
1999-08-11$135.00$135.001,360
1999-08-10$135.00$135.00190
1999-08-09$131.25$131.251,430
1999-08-06$136.25$136.25860
1999-08-05$131.25$131.2517,960
1999-08-04$132.50$132.506,400
1999-08-03$137.50$137.502,510
1999-08-02$138.75$138.751,970
1999-07-30$140.00$140.001,710
1999-07-29$141.25$141.254,490
1999-07-28$141.25$141.253,730
1999-07-27$136.88$136.882,880
1999-07-26$137.50$137.504,860
1999-07-23$135.63$135.63690
1999-07-22$137.50$137.504,000
1999-07-21$139.38$139.384,130
1999-07-20$142.50$142.503,790
1999-07-19$145.00$145.004,070
1999-07-16$150.00$150.004,910
1999-07-15$155.00$155.003,690
1999-07-14$155.00$155.006,290
1999-07-13$146.25$146.252,860
1999-07-12$150.00$150.008,230
1999-07-09$163.75$163.7511,650
1999-07-08$166.25$166.2512,680
1999-07-07$165.00$165.0013,340
1999-07-06$160.00$160.0013,350
1999-07-02$150.63$150.6324,540
1999-07-01$150.00$150.0010,880
1999-06-30$149.38$149.3822,150
1999-06-29$133.75$133.758,860
1999-06-28$132.50$132.503,120
1999-06-25$135.00$135.007,140
1999-06-24$126.25$126.257,250
1999-06-23$135.00$135.005,200
1999-06-22$138.75$138.753,210
1999-06-21$141.88$141.885,290
1999-06-18$142.50$142.503,180
1999-06-17$142.50$142.502,520
1999-06-16$143.75$143.757,230
1999-06-15$146.25$146.255,700
1999-06-14$147.50$147.507,480
1999-06-11$146.25$146.258,590
1999-06-10$146.25$146.251,420
1999-06-09$146.88$146.886,680
1999-06-08$145.63$145.6317,890
1999-06-07$146.25$146.2523,740
1999-06-04$140.00$140.008,880
1999-06-03$138.75$138.759,880
1999-06-02$128.13$128.131,680
1999-06-01$130.00$130.001,760
1999-05-28$127.50$127.505,120
1999-05-27$128.75$128.755,850
1999-05-26$123.75$123.755,430
1999-05-25$120.00$120.002,520
1999-05-24$118.75$118.753,490
1999-05-21$117.50$117.50380
1999-05-20$114.38$114.383,140
1999-05-19$116.88$116.881,350
1999-05-18$117.50$117.503,710
1999-05-17$123.75$123.751,420
1999-05-14$125.00$125.002,870
1999-05-13$122.50$122.5017,190
1999-05-12$110.00$110.008,320
1999-05-11$108.75$108.759,490
1999-05-10$110.63$110.6310,240
1999-05-07$120.00$120.005,300
1999-05-06$122.50$122.504,490
1999-05-05$127.50$127.502,330
1999-05-04$131.25$131.257,270
1999-05-03$123.75$123.758,330
1999-04-30$125.00$125.004,890
1999-04-29$113.75$113.754,580
1999-04-28$108.75$108.751,580
1999-04-27$108.13$108.132,160
1999-04-26$112.50$112.505,090
1999-04-23$108.75$108.751,580
1999-04-22$107.50$107.501,750
1999-04-21$106.25$106.2514,200
1999-04-20$107.50$107.503,750
1999-04-19$106.25$106.253,200
1999-04-16$104.38$104.381,760
1999-04-15$101.25$101.251,260
1999-04-14$107.50$107.503,510
1999-04-13$101.25$101.257,000
1999-04-12$97.50$97.503,350
1999-04-09$98.75$98.755,060
1999-04-08$101.88$101.884,170
1999-04-07$98.75$98.7510,260
1999-04-06$88.75$88.751,030
1999-04-05$88.13$88.132,260
1999-04-01$88.75$88.752,430
1999-03-31$91.25$91.252,240
1999-03-30$87.50$87.502,240
1999-03-29$88.75$88.753,250
1999-03-26$86.25$86.254,630
1999-03-25$91.25$91.254,910
1999-03-24$95.00$95.002,720
1999-03-23$95.00$95.002,100
1999-03-22$95.63$95.631,410
1999-03-19$98.13$98.131,040
1999-03-18$98.13$98.136,420
1999-03-17$100.00$100.002,980
1999-03-16$101.25$101.25600
1999-03-15$101.88$101.884,850
1999-03-12$98.75$98.752,190
1999-03-11$98.75$98.753,340
1999-03-10$98.75$98.753,550
1999-03-09$100.63$100.631,580
1999-03-08$102.50$102.501,370
1999-03-05$102.50$102.503,180
1999-03-04$101.88$101.882,350
1999-03-03$102.50$102.501,860
1999-03-02$102.50$102.50540
1999-03-01$102.50$102.501,020
1999-02-26$103.13$103.133,970
1999-02-25$107.50$107.502,490
1999-02-24$110.00$110.003,270
1999-02-23$120.63$120.632,540
1999-02-22$121.25$121.252,350
1999-02-19$120.00$120.001,590
1999-02-18$120.00$120.001,500
1999-02-17$123.75$123.752,240
1999-02-16$122.50$122.504,750
1999-02-12$120.00$120.001,260
1999-02-11$120.63$120.635,630
1999-02-10$115.00$115.003,100
1999-02-09$112.50$112.506,630
1999-02-08$118.75$118.754,520
1999-02-05$131.25$131.256,470
1999-02-04$130.00$130.005,110
1999-02-03$123.75$123.755,180
1999-02-02$133.75$133.7517,700
1999-02-01$135.00$135.0017,470
1999-01-29$117.50$117.508,920
1999-01-28$111.88$111.8818,390
1999-01-27$100.63$100.631,210
1999-01-26$103.13$103.134,720
1999-01-25$101.25$101.251,760
1999-01-22$104.38$104.382,140
1999-01-21$102.50$102.502,990
1999-01-20$103.75$103.754,690
1999-01-19$103.75$103.754,020
1999-01-15$103.13$103.134,640
1999-01-14$105.63$105.631,760
1999-01-13$105.00$105.002,920
1999-01-12$105.00$105.002,170
1999-01-11$108.75$108.753,900
1999-01-08$104.38$104.382,790
1999-01-07$107.50$107.502,670
1999-01-06$107.50$107.502,040
1999-01-05$106.25$106.256,220
1999-01-04$105.63$105.633,000