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.

View year

Historical Stock Price — 2017

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volume
2017-12-29$3.91$3.9124,800
2017-12-28$4.00$4.009,700
2017-12-27$3.95$3.955,100
2017-12-26$3.98$3.984,100
2017-12-22$4.05$4.052,000
2017-12-21$4.05$4.0516,800
2017-12-20$4.05$4.051,100
2017-12-19$4.09$4.097,300
2017-12-18$4.12$4.12700
2017-12-15$4.10$4.101,600
2017-12-14$4.22$4.221,400
2017-12-13$4.10$4.100
2017-12-12$4.10$4.103,800
2017-12-11$4.10$4.105,500
2017-12-08$4.15$4.151,000
2017-12-07$4.15$4.152,000
2017-12-06$4.30$4.301,300
2017-12-05$4.15$4.154,800
2017-12-04$4.30$4.30300
2017-12-01$4.30$4.302,000
2017-11-30$4.29$4.291,600
2017-11-29$4.26$4.261,900
2017-11-28$4.25$4.253,700
2017-11-27$4.15$4.1511,400
2017-11-24$4.35$4.353,100
2017-11-22$4.20$4.2012,300
2017-11-21$4.30$4.303,500
2017-11-20$4.30$4.301,900
2017-11-17$4.35$4.354,800
2017-11-16$4.20$4.203,500
2017-11-15$4.15$4.151,500
2017-11-14$4.20$4.201,800
2017-11-13$4.20$4.204,800
2017-11-10$4.35$4.354,100
2017-11-09$4.25$4.251,900
2017-11-08$4.35$4.351,500
2017-11-07$4.35$4.351,800
2017-11-06$4.40$4.4028,600
2017-11-03$4.89$4.892,700
2017-11-02$4.96$4.966,000
2017-11-01$4.95$4.952,700
2017-10-31$4.75$4.7511,500
2017-10-30$5.10$5.1014,000
2017-10-27$4.95$4.959,400
2017-10-26$4.90$4.905,700
2017-10-25$4.65$4.653,600
2017-10-24$4.80$4.802,600
2017-10-23$4.86$4.864,100
2017-10-20$4.95$4.955,600
2017-10-19$4.95$4.952,000
2017-10-18$4.95$4.9511,100
2017-10-17$4.90$4.905,900
2017-10-16$4.70$4.701,800
2017-10-13$4.55$4.556,600
2017-10-12$4.20$4.201,600
2017-10-11$4.45$4.456,300
2017-10-10$3.95$3.952,100
2017-10-09$4.10$4.104,700
2017-10-06$3.95$3.95900
2017-10-05$3.95$3.952,200
2017-10-04$3.85$3.852,000
2017-10-03$3.95$3.954,100
2017-10-02$4.08$4.081,700
2017-09-29$4.06$4.062,900
2017-09-28$3.85$3.853,700
2017-09-27$4.00$4.001,500
2017-09-26$4.15$4.15800
2017-09-25$4.15$4.153,600
2017-09-22$4.15$4.15700
2017-09-21$3.95$3.953,500
2017-09-20$4.05$4.0512,700
2017-09-19$4.20$4.207,200
2017-09-18$4.40$4.407,600
2017-09-15$4.55$4.557,200
2017-09-14$4.55$4.555,500
2017-09-13$4.60$4.60900
2017-09-12$4.74$4.744,700
2017-09-11$4.55$4.5510,100
2017-09-08$4.70$4.705,200
2017-09-07$4.83$4.834,500
2017-09-06$5.00$5.004,300
2017-09-05$5.05$5.058,000
2017-09-01$4.75$4.754,400
2017-08-31$4.70$4.704,900
2017-08-30$4.80$4.802,200
2017-08-29$4.85$4.853,100
2017-08-28$4.70$4.7017,900
2017-08-25$4.75$4.755,200
2017-08-24$4.80$4.806,200
2017-08-23$4.80$4.806,200
2017-08-22$4.90$4.905,300
2017-08-21$4.92$4.9220,300
2017-08-18$4.90$4.908,100
2017-08-17$4.90$4.905,500
2017-08-16$4.85$4.857,900
2017-08-15$5.05$5.0519,400
2017-08-14$4.64$4.6424,000
2017-08-11$4.59$4.5940,200
2017-08-10$4.50$4.50187,200
2017-08-09$3.50$3.501,200
2017-08-08$3.45$3.45900
2017-08-07$3.35$3.356,300
2017-08-04$3.30$3.301,600
2017-08-03$3.50$3.5030,800
2017-08-02$3.55$3.559,700
2017-08-01$3.35$3.356,100
2017-07-31$3.35$3.35400
2017-07-28$3.40$3.400
2017-07-27$3.40$3.40300
2017-07-26$3.55$3.55200
2017-07-25$3.35$3.355,900
2017-07-24$3.50$3.509,900
2017-07-21$3.35$3.355,800
2017-07-20$3.45$3.456,800
2017-07-19$3.56$3.567,600
2017-07-18$3.30$3.304,200
2017-07-17$3.31$3.311,300
2017-07-14$3.35$3.352,500
2017-07-13$3.30$3.303,100
2017-07-12$3.30$3.300
2017-07-11$3.30$3.303,500
2017-07-10$3.25$3.259,700
2017-07-07$3.30$3.309,600
2017-07-06$3.30$3.30600
2017-07-05$3.40$3.4011,000
2017-07-03$3.35$3.351,600
2017-06-30$3.55$3.555,900
2017-06-29$3.50$3.503,300
2017-06-28$3.45$3.452,700
2017-06-27$3.45$3.451,200
2017-06-26$3.34$3.341,900
2017-06-23$3.26$3.267,300
2017-06-22$3.35$3.353,300
2017-06-21$3.40$3.405,100
2017-06-20$3.38$3.388,900
2017-06-19$3.41$3.413,700
2017-06-16$3.49$3.49700
2017-06-15$3.55$3.550
2017-06-14$3.55$3.55100
2017-06-13$3.41$3.410
2017-06-12$3.41$3.411,700
2017-06-09$3.47$3.470
2017-06-08$3.47$3.47100
2017-06-07$3.45$3.4512,000
2017-06-06$3.50$3.501,300
2017-06-05$3.80$3.80600
2017-06-02$3.70$3.703,200
2017-06-01$3.70$3.70600
2017-05-31$3.80$3.80100
2017-05-30$3.80$3.80500
2017-05-26$3.55$3.558,700
2017-05-25$3.65$3.650
2017-05-24$3.65$3.65700
2017-05-23$3.75$3.75400
2017-05-22$3.57$3.57300
2017-05-19$3.90$3.900
2017-05-18$3.90$3.90400
2017-05-17$3.55$3.5510,500
2017-05-16$3.75$3.75500
2017-05-15$3.90$3.901,700
2017-05-12$3.90$3.90200
2017-05-11$3.80$3.802,100
2017-05-10$3.80$3.800
2017-05-09$3.80$3.80200
2017-05-08$3.92$3.920
2017-05-05$3.92$3.921,100
2017-05-04$3.95$3.950
2017-05-03$3.95$3.95100
2017-05-02$3.82$3.820
2017-05-01$3.82$3.820
2017-04-28$3.82$3.82700
2017-04-27$3.90$3.900
2017-04-26$3.90$3.901,300
2017-04-25$4.00$4.001,100
2017-04-24$3.80$3.801,400
2017-04-21$3.85$3.850
2017-04-20$3.85$3.850
2017-04-19$3.85$3.850
2017-04-18$3.85$3.85500
2017-04-17$3.85$3.851,000
2017-04-13$3.92$3.92200
2017-04-12$3.85$3.85600
2017-04-11$3.90$3.901,400
2017-04-10$3.85$3.85400
2017-04-07$4.00$4.00300
2017-04-06$3.92$3.920
2017-04-05$3.92$3.921,600
2017-04-04$3.90$3.901,100
2017-04-03$3.90$3.906,300
2017-03-31$3.85$3.853,500
2017-03-30$4.00$4.001,500
2017-03-29$4.09$4.092,000
2017-03-28$3.95$3.954,300
2017-03-27$3.80$3.80500
2017-03-24$3.81$3.81100
2017-03-23$3.70$3.70500
2017-03-22$3.80$3.802,200
2017-03-21$3.80$3.804,800
2017-03-20$3.75$3.759,700
2017-03-17$3.98$3.983,400
2017-03-16$3.80$3.809,000
2017-03-15$4.15$4.151,800
2017-03-14$3.90$3.902,500
2017-03-13$3.95$3.951,300
2017-03-10$3.95$3.953,100
2017-03-09$3.95$3.952,000
2017-03-08$3.95$3.951,300
2017-03-07$3.95$3.951,500
2017-03-06$3.95$3.951,200
2017-03-03$3.95$3.95500
2017-03-02$3.95$3.956,700
2017-03-01$4.20$4.202,100
2017-02-28$4.15$4.15700
2017-02-27$4.30$4.302,000
2017-02-24$4.16$4.16300
2017-02-23$4.15$4.151,800
2017-02-22$4.10$4.1016,000
2017-02-21$4.00$4.004,300
2017-02-17$3.75$3.7531,000
2017-02-16$3.90$3.905,900
2017-02-15$3.75$3.7555,100
2017-02-14$3.95$3.95700
2017-02-13$3.80$3.80900
2017-02-10$4.00$4.00600
2017-02-09$3.95$3.951,800
2017-02-08$3.95$3.954,100
2017-02-07$3.95$3.954,400
2017-02-06$3.95$3.958,900
2017-02-03$4.00$4.001,800
2017-02-02$4.04$4.042,100
2017-02-01$3.95$3.95400
2017-01-31$4.00$4.00700
2017-01-30$4.00$4.008,400
2017-01-27$4.30$4.30700
2017-01-26$4.50$4.50500
2017-01-25$4.40$4.401,200
2017-01-24$4.50$4.500
2017-01-23$4.50$4.503,800
2017-01-20$4.48$4.481,100
2017-01-19$4.33$4.33100
2017-01-18$4.59$4.590
2017-01-17$4.59$4.59500
2017-01-13$4.56$4.56400
2017-01-12$4.40$4.400
2017-01-11$4.40$4.40600
2017-01-10$4.37$4.371,600
2017-01-09$4.50$4.501,000
2017-01-06$4.35$4.35700
2017-01-05$4.55$4.553,300
2017-01-04$4.70$4.702,900
2017-01-03$4.70$4.704,200