OTC:CYAN | Historical Stock Price | CYANOTECH CORP

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
1991-05-21 to 2026-08-27
Data captured

Stock Price Chart

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

$0.23$0.69$2.06$6.21$18.69$56.241991-05-212026-08-27

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 volume
1999-12-31$6.25$6.2513,525
1999-12-30$6.75$6.7511,500
1999-12-29$7.00$7.0031,550
1999-12-28$7.50$7.5067,000
1999-12-27$8.50$8.5069,425
1999-12-23$7.50$7.5064,100
1999-12-22$5.88$5.8882,800
1999-12-21$5.50$5.5067,175
1999-12-20$4.50$4.5057,500
1999-12-17$3.63$3.6329,850
1999-12-16$2.63$2.6326,150
1999-12-15$2.50$2.5032,325
1999-12-14$2.63$2.6337,925
1999-12-13$2.13$2.1315,775
1999-12-10$2.13$2.1331,800
1999-12-09$2.50$2.5015,525
1999-12-08$2.75$2.7514,075
1999-12-07$2.63$2.6310,775
1999-12-06$2.38$2.382,500
1999-12-03$2.25$2.253,775
1999-12-02$2.38$2.387,700
1999-12-01$2.38$2.385,250
1999-11-30$2.50$2.506,850
1999-11-29$2.63$2.6346,200
1999-11-26$2.50$2.5020,250
1999-11-24$2.63$2.6343,600
1999-11-23$3.13$3.132,950
1999-11-22$3.13$3.1310,625
1999-11-19$2.63$2.6312,375
1999-11-18$2.75$2.7510,825
1999-11-17$2.50$2.5011,450
1999-11-16$2.50$2.5010,850
1999-11-15$2.50$2.5011,175
1999-11-12$2.75$2.757,150
1999-11-11$2.88$2.8819,400
1999-11-10$2.13$2.131,700
1999-11-09$2.13$2.136,425
1999-11-08$2.25$2.2517,225
1999-11-05$2.38$2.3811,275
1999-11-04$2.38$2.3815,250
1999-11-03$2.13$2.138,175
1999-11-02$2.25$2.2520,350
1999-11-01$2.13$2.1327,900
1999-10-29$2.25$2.259,550
1999-10-28$2.38$2.3810,050
1999-10-27$2.50$2.505,750
1999-10-26$2.63$2.633,675
1999-10-25$2.50$2.5024,925
1999-10-22$2.75$2.759,550
1999-10-21$2.75$2.755,075
1999-10-20$2.25$2.2511,325
1999-10-19$2.50$2.503,875
1999-10-18$2.50$2.507,500
1999-10-15$2.63$2.631,975
1999-10-14$2.75$2.758,825
1999-10-13$2.75$2.757,025
1999-10-12$2.88$2.8823,725
1999-10-11$2.75$2.751,225
1999-10-08$2.63$2.6315,550
1999-10-07$2.75$2.7519,575
1999-10-06$2.75$2.75775
1999-10-05$2.88$2.8814,450
1999-10-04$2.88$2.8828,400
1999-10-01$2.88$2.887,050
1999-09-30$2.88$2.883,425
1999-09-29$3.00$3.008,500
1999-09-28$3.00$3.005,875
1999-09-27$3.50$3.502,650
1999-09-24$3.25$3.2518,350
1999-09-23$3.25$3.2526,475
1999-09-22$3.75$3.753,800
1999-09-21$3.50$3.507,450
1999-09-20$3.75$3.752,375
1999-09-17$3.63$3.632,175
1999-09-16$3.75$3.756,500
1999-09-15$3.75$3.757,500
1999-09-14$4.00$4.0011,125
1999-09-13$4.00$4.006,000
1999-09-10$4.00$4.0010,700
1999-09-09$3.88$3.884,325
1999-09-08$4.00$4.007,950
1999-09-07$4.00$4.005,125
1999-09-03$3.88$3.885,750
1999-09-02$3.81$3.811,850
1999-09-01$3.75$3.75875
1999-08-31$3.88$3.882,400
1999-08-30$3.63$3.636,775
1999-08-27$3.88$3.885,200
1999-08-26$3.88$3.888,850
1999-08-25$3.75$3.759,525
1999-08-24$3.88$3.887,625
1999-08-23$4.25$4.2510,725
1999-08-20$3.88$3.887,325
1999-08-19$3.88$3.882,925
1999-08-18$3.88$3.884,225
1999-08-17$3.88$3.8810,400
1999-08-16$4.13$4.138,000
1999-08-13$4.00$4.0027,450
1999-08-12$3.88$3.8829,600
1999-08-11$4.00$4.00118,150
1999-08-10$3.75$3.758,200
1999-08-09$3.75$3.7510,125
1999-08-06$3.75$3.7513,600
1999-08-05$3.63$3.6337,300
1999-08-04$4.00$4.0019,800
1999-08-03$4.50$4.506,825
1999-08-02$5.00$5.003,450
1999-07-30$4.50$4.509,575
1999-07-29$4.50$4.501,150
1999-07-28$4.50$4.508,225
1999-07-27$5.00$5.001,825
1999-07-26$5.50$5.504,200
1999-07-23$5.25$5.252,375
1999-07-22$5.25$5.25950
1999-07-21$5.25$5.252,100
1999-07-20$5.50$5.5041,825
1999-07-19$5.25$5.2522,150
1999-07-16$5.00$5.0016,500
1999-07-15$5.00$5.009,175
1999-07-14$4.63$4.634,850
1999-07-13$4.50$4.503,475
1999-07-12$4.50$4.504,675
1999-07-09$4.38$4.383,850
1999-07-08$4.00$4.004,375
1999-07-07$4.25$4.256,625
1999-07-06$4.13$4.135,025
1999-07-02$4.50$4.506,025
1999-07-01$5.00$5.004,100
1999-06-30$4.50$4.5020,500
1999-06-29$5.25$5.2533,700
1999-06-28$6.00$6.0016,350
1999-06-25$6.00$6.0019,800
1999-06-24$5.63$5.6334,000
1999-06-23$4.00$4.002,175
1999-06-22$3.88$3.8820,475
1999-06-21$4.13$4.1395,025
1999-06-18$4.13$4.1338,100
1999-06-17$4.13$4.1334,700
1999-06-16$3.63$3.632,825
1999-06-15$3.50$3.502,325
1999-06-14$3.50$3.508,425
1999-06-11$3.50$3.504,725
1999-06-10$3.50$3.503,525
1999-06-09$4.00$4.004,600
1999-06-08$4.13$4.131,050
1999-06-07$3.50$3.50775
1999-06-04$4.00$4.0021,900
1999-06-03$4.00$4.0024,100
1999-06-02$3.25$3.252,175
1999-06-01$3.25$3.250
1999-05-28$3.25$3.253,175
1999-05-27$3.50$3.5013,450
1999-05-26$3.63$3.637,250
1999-05-25$3.50$3.503,900
1999-05-24$3.94$3.943,000
1999-05-21$4.13$4.1345,100
1999-05-20$4.50$4.50775
1999-05-19$4.50$4.50750
1999-05-18$4.13$4.136,475
1999-05-17$4.50$4.5012,800
1999-05-14$4.50$4.5071,425
1999-05-13$3.88$3.884,125
1999-05-12$3.50$3.5011,875
1999-05-11$3.75$3.7543,150
1999-05-10$4.25$4.2515,500
1999-05-07$3.75$3.754,825
1999-05-06$3.88$3.8823,525
1999-05-05$2.63$2.639,275
1999-05-04$2.88$2.8810,450
1999-05-03$2.75$2.7549,050
1999-04-30$3.38$3.3854,975
1999-04-29$3.50$3.50625
1999-04-28$3.25$3.254,375
1999-04-27$3.63$3.6316,200
1999-04-26$3.25$3.2511,900
1999-04-23$3.38$3.382,875
1999-04-22$3.38$3.38625
1999-04-21$3.38$3.3811,600
1999-04-20$3.50$3.509,575
1999-04-19$3.50$3.503,825
1999-04-16$3.50$3.503,725
1999-04-15$4.00$4.001,350
1999-04-14$3.50$3.505,025
1999-04-13$4.00$4.006,750
1999-04-12$3.50$3.501,225
1999-04-09$3.63$3.632,400
1999-04-08$3.63$3.631,300
1999-04-07$3.75$3.755,600
1999-04-06$3.50$3.504,800
1999-04-05$3.88$3.883,650
1999-04-01$4.13$4.13700
1999-03-31$4.00$4.002,500
1999-03-30$4.13$4.13850
1999-03-29$4.13$4.131,725
1999-03-26$4.00$4.006,500
1999-03-25$4.00$4.001,175
1999-03-24$4.13$4.133,650
1999-03-23$3.88$3.884,550
1999-03-22$3.50$3.509,650
1999-03-19$3.75$3.757,150
1999-03-18$4.00$4.004,575
1999-03-17$4.00$4.005,150
1999-03-16$4.00$4.003,275
1999-03-15$4.00$4.0016,675
1999-03-12$4.00$4.0020,125
1999-03-11$4.00$4.0019,825
1999-03-10$3.50$3.506,950
1999-03-09$3.63$3.6314,250
1999-03-08$4.00$4.0022,475
1999-03-05$4.13$4.132,650
1999-03-04$4.13$4.13375
1999-03-03$4.13$4.136,100
1999-03-02$4.13$4.136,175
1999-03-01$4.25$4.254,175
1999-02-26$4.13$4.134,350
1999-02-25$4.13$4.134,200
1999-02-24$4.25$4.256,600
1999-02-23$4.25$4.25650
1999-02-22$4.25$4.25975
1999-02-19$4.25$4.251,375
1999-02-18$4.25$4.253,475
1999-02-17$4.50$4.502,600
1999-02-16$4.50$4.502,600
1999-02-12$4.50$4.502,225
1999-02-11$4.13$4.131,875
1999-02-10$4.25$4.255,400
1999-02-09$4.50$4.50275
1999-02-08$4.25$4.25775
1999-02-05$4.13$4.13500
1999-02-04$4.50$4.507,175
1999-02-03$4.38$4.381,425
1999-02-02$4.38$4.3826,675
1999-02-01$4.50$4.5011,850
1999-01-29$4.50$4.503,800
1999-01-28$4.50$4.50700
1999-01-27$4.50$4.501,525
1999-01-26$4.50$4.502,075
1999-01-25$4.50$4.5013,700
1999-01-22$4.50$4.506,300
1999-01-21$4.63$4.639,500
1999-01-20$4.38$4.3815,500
1999-01-19$4.88$4.882,550
1999-01-15$4.88$4.882,125
1999-01-14$5.00$5.002,475
1999-01-13$4.75$4.753,000
1999-01-12$4.63$4.6342,950
1999-01-11$4.50$4.502,050
1999-01-08$4.50$4.505,750
1999-01-07$4.50$4.502,475
1999-01-06$4.50$4.505,150
1999-01-05$4.50$4.50925
1999-01-04$4.25$4.254,425