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 — 2021

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volume
2021-12-31$3.24$3.2418,500
2021-12-30$3.13$3.1338,800
2021-12-29$3.10$3.1019,900
2021-12-28$3.10$3.1049,300
2021-12-27$3.08$3.08140,900
2021-12-23$3.19$3.1928,100
2021-12-22$3.16$3.1634,500
2021-12-21$3.19$3.1922,300
2021-12-20$3.13$3.1356,000
2021-12-17$3.27$3.278,800
2021-12-16$3.23$3.2331,500
2021-12-15$3.19$3.1960,900
2021-12-14$3.35$3.3510,200
2021-12-13$3.38$3.3841,800
2021-12-10$3.45$3.45102,500
2021-12-09$3.79$3.79232,400
2021-12-08$3.74$3.7461,500
2021-12-07$3.52$3.5228,200
2021-12-06$3.47$3.4764,700
2021-12-03$3.47$3.4764,200
2021-12-02$3.44$3.44118,900
2021-12-01$3.38$3.3859,200
2021-11-30$3.55$3.5582,000
2021-11-29$3.51$3.5170,300
2021-11-26$3.37$3.3757,600
2021-11-24$3.34$3.34483,800
2021-11-23$3.10$3.1011,800
2021-11-22$3.13$3.1316,600
2021-11-19$3.20$3.2011,900
2021-11-18$3.21$3.2112,100
2021-11-17$3.19$3.1948,900
2021-11-16$3.24$3.2441,800
2021-11-15$3.36$3.3629,100
2021-11-12$3.33$3.33120,400
2021-11-11$3.33$3.3355,400
2021-11-10$3.26$3.26211,500
2021-11-09$3.23$3.2321,100
2021-11-08$3.20$3.2062,000
2021-11-05$3.16$3.165,800
2021-11-04$3.22$3.2217,100
2021-11-03$3.19$3.1918,700
2021-11-02$3.12$3.1279,800
2021-11-01$3.14$3.1412,000
2021-10-29$3.07$3.078,700
2021-10-28$3.06$3.0612,500
2021-10-27$3.01$3.0130,500
2021-10-26$3.07$3.079,700
2021-10-25$3.05$3.0554,400
2021-10-22$3.05$3.0516,500
2021-10-21$3.05$3.0523,400
2021-10-20$3.02$3.02168,900
2021-10-19$2.81$2.819,700
2021-10-18$2.85$2.8514,000
2021-10-15$2.84$2.8415,600
2021-10-14$2.91$2.913,200
2021-10-13$2.92$2.924,500
2021-10-12$2.90$2.9046,600
2021-10-11$2.87$2.875,500
2021-10-08$2.93$2.9319,700
2021-10-07$2.97$2.9714,600
2021-10-06$2.95$2.956,300
2021-10-05$2.95$2.9515,400
2021-10-04$2.84$2.8433,700
2021-10-01$2.85$2.857,400
2021-09-30$2.90$2.9022,400
2021-09-29$2.86$2.8614,900
2021-09-28$2.89$2.893,300
2021-09-27$2.90$2.9015,800
2021-09-24$2.95$2.9537,300
2021-09-23$2.91$2.9114,300
2021-09-22$2.87$2.877,500
2021-09-21$2.85$2.8516,900
2021-09-20$2.95$2.9531,800
2021-09-17$2.85$2.8594,900
2021-09-16$2.93$2.9327,000
2021-09-15$2.90$2.9014,000
2021-09-14$2.90$2.9010,700
2021-09-13$2.96$2.9630,000
2021-09-10$2.97$2.9715,500
2021-09-09$3.06$3.0616,600
2021-09-08$3.02$3.02136,400
2021-09-07$3.10$3.1051,500
2021-09-03$3.11$3.1157,300
2021-09-02$3.12$3.12105,000
2021-09-01$3.16$3.1648,200
2021-08-31$3.16$3.16142,800
2021-08-30$3.13$3.1395,200
2021-08-27$3.06$3.0649,700
2021-08-26$3.05$3.0515,400
2021-08-25$3.01$3.0188,500
2021-08-24$2.98$2.981,200
2021-08-23$2.98$2.9835,800
2021-08-20$2.95$2.9536,800
2021-08-19$2.84$2.845,800
2021-08-18$2.86$2.867,800
2021-08-17$2.87$2.8714,200
2021-08-16$2.90$2.9029,200
2021-08-13$3.11$3.1135,900
2021-08-12$3.01$3.0136,500
2021-08-11$3.02$3.0293,000
2021-08-10$2.93$2.9318,100
2021-08-09$2.92$2.924,200
2021-08-06$2.93$2.937,700
2021-08-05$2.94$2.944,600
2021-08-04$2.93$2.935,200
2021-08-03$3.01$3.0110,300
2021-08-02$3.06$3.062,700
2021-07-30$3.06$3.0610,800
2021-07-29$3.15$3.1584,100
2021-07-28$2.98$2.987,800
2021-07-27$2.93$2.9315,000
2021-07-26$3.09$3.0924,900
2021-07-23$3.15$3.1583,200
2021-07-22$3.10$3.1090,700
2021-07-21$3.26$3.26158,100
2021-07-20$2.91$2.9140,300
2021-07-19$2.83$2.8362,100
2021-07-16$2.93$2.932,200
2021-07-15$2.99$2.99104,400
2021-07-14$2.94$2.9418,300
2021-07-13$2.99$2.9915,800
2021-07-12$3.05$3.0519,300
2021-07-09$2.92$2.9221,600
2021-07-08$2.96$2.9634,700
2021-07-07$2.88$2.8817,800
2021-07-06$2.95$2.9515,800
2021-07-02$3.02$3.0229,900
2021-07-01$2.99$2.9915,000
2021-06-30$3.04$3.04164,600
2021-06-29$2.82$2.8244,100
2021-06-28$2.92$2.92261,900
2021-06-25$2.91$2.9137,100
2021-06-24$2.83$2.8326,800
2021-06-23$2.84$2.8419,000
2021-06-22$2.78$2.7828,900
2021-06-21$2.78$2.7858,600
2021-06-18$2.98$2.98569,700
2021-06-17$2.73$2.7351,100
2021-06-16$2.79$2.7933,600
2021-06-15$2.80$2.8094,900
2021-06-14$3.01$3.0141,400
2021-06-11$3.00$3.005,000
2021-06-10$3.00$3.0034,000
2021-06-09$3.07$3.0713,500
2021-06-08$3.05$3.0530,700
2021-06-07$3.12$3.1227,700
2021-06-04$3.12$3.1232,200
2021-06-03$3.11$3.11155,700
2021-06-02$3.12$3.12181,000
2021-06-01$3.06$3.0640,400
2021-05-28$3.14$3.1428,700
2021-05-27$3.12$3.1224,800
2021-05-26$2.95$2.9549,200
2021-05-25$2.95$2.9588,400
2021-05-24$2.90$2.903,100
2021-05-21$2.89$2.899,400
2021-05-20$2.96$2.9613,900
2021-05-19$2.92$2.927,700
2021-05-18$2.95$2.9515,800
2021-05-17$2.84$2.846,200
2021-05-14$2.83$2.8315,500
2021-05-13$2.72$2.7249,200
2021-05-12$2.76$2.7657,500
2021-05-11$2.85$2.8552,000
2021-05-10$2.95$2.9557,900
2021-05-07$3.09$3.0961,100
2021-05-06$3.07$3.0784,000
2021-05-05$3.21$3.2127,500
2021-05-04$3.15$3.1515,200
2021-05-03$3.24$3.2462,500
2021-04-30$3.14$3.1425,200
2021-04-29$3.20$3.2024,100
2021-04-28$3.23$3.2335,200
2021-04-27$3.24$3.24357,900
2021-04-26$3.11$3.1166,900
2021-04-23$3.17$3.17110,900
2021-04-22$3.05$3.0525,900
2021-04-21$3.08$3.0868,900
2021-04-20$3.16$3.1651,800
2021-04-19$3.09$3.0923,300
2021-04-16$3.14$3.1434,900
2021-04-15$3.09$3.0930,600
2021-04-14$3.23$3.23208,400
2021-04-13$3.15$3.1591,100
2021-04-12$3.20$3.2090,200
2021-04-09$3.37$3.3767,300
2021-04-08$3.40$3.4047,700
2021-04-07$3.45$3.45178,800
2021-04-06$3.35$3.35148,500
2021-04-05$3.28$3.28111,000
2021-04-01$3.39$3.39147,200
2021-03-31$3.30$3.30253,600
2021-03-30$3.51$3.51735,300
2021-03-29$4.14$4.1414,483,700
2021-03-26$3.17$3.1711,100
2021-03-25$3.22$3.225,500
2021-03-24$3.25$3.2534,400
2021-03-23$3.55$3.559,400
2021-03-22$3.69$3.6910,800
2021-03-19$3.80$3.8018,200
2021-03-18$3.84$3.8417,600
2021-03-17$3.74$3.7424,200
2021-03-16$3.75$3.7527,300
2021-03-15$3.91$3.9123,800
2021-03-12$3.87$3.8752,900
2021-03-11$4.12$4.12126,700
2021-03-10$3.79$3.7923,000
2021-03-09$3.89$3.8936,200
2021-03-08$3.67$3.673,500
2021-03-05$3.64$3.6419,800
2021-03-04$3.55$3.5569,200
2021-03-03$3.76$3.768,400
2021-03-02$3.82$3.8218,000
2021-03-01$3.79$3.7913,600
2021-02-26$3.80$3.808,000
2021-02-25$3.77$3.7717,600
2021-02-24$3.84$3.8488,600
2021-02-23$3.52$3.528,800
2021-02-22$3.50$3.508,700
2021-02-19$3.48$3.488,400
2021-02-18$3.55$3.555,000
2021-02-17$3.68$3.685,600
2021-02-16$3.70$3.7043,500
2021-02-12$3.44$3.448,000
2021-02-11$3.46$3.4670,400
2021-02-10$3.92$3.9220,400
2021-02-09$3.72$3.7221,900
2021-02-08$3.70$3.7031,900
2021-02-05$3.70$3.7013,200
2021-02-04$3.70$3.705,700
2021-02-03$3.77$3.778,100
2021-02-02$3.76$3.7616,000
2021-02-01$3.80$3.806,900
2021-01-29$3.73$3.7334,300
2021-01-28$3.62$3.6213,800
2021-01-27$3.67$3.6794,100
2021-01-26$3.43$3.434,500
2021-01-25$3.40$3.4019,300
2021-01-22$3.49$3.4923,500
2021-01-21$3.40$3.4088,900
2021-01-20$3.20$3.202,500
2021-01-19$3.19$3.1910,100
2021-01-15$3.19$3.1912,000
2021-01-14$3.23$3.236,900
2021-01-13$3.30$3.309,100
2021-01-12$3.29$3.294,400
2021-01-11$3.26$3.269,500
2021-01-08$3.17$3.1712,700
2021-01-07$3.33$3.3371,700
2021-01-06$3.15$3.155,800
2021-01-05$3.14$3.1412,900
2021-01-04$3.22$3.2215,900