NASDAQ:CSPI | Historical Stock Price | CSP INC /MA/

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
1982-01-29 to 2026-09-04
Data captured

Stock Price Chart

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

$1.18$2.32$4.56$8.97$17.61$34.601982-01-292026-08-27

Logarithmic scale. Both lines share the same starting value for the selected range.

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Historical Stock Price — 1985

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1985-12-31$4.41$4.4120,231
1985-12-30$4.37$4.3736,736
1985-12-27$4.27$4.2711,447
1985-12-26$4.18$4.183,727
1985-12-24$4.32$4.3213,842
1985-12-23$4.09$4.0913,842
1985-12-20$4.23$4.2310,116
1985-12-19$4.09$4.091,331
1985-12-18$4.18$4.18294,417
1985-12-17$4.09$4.0923,692
1985-12-16$3.76$3.7630,081
1985-12-13$3.76$3.765,590
1985-12-12$3.71$3.717,187
1985-12-11$3.62$3.623,727
1985-12-10$3.57$3.5760,960
1985-12-09$3.66$3.6680,925
1985-12-06$3.71$3.715,590
1985-12-05$3.66$3.66113,667
1985-12-04$3.71$3.7123,159
1985-12-03$3.66$3.6618,102
1985-12-02$3.66$3.6673,205
1985-11-29$3.85$3.853,194
1985-11-27$3.94$3.9410,914
1985-11-26$3.94$3.946,389
1985-11-25$3.99$3.995,324
1985-11-22$4.13$4.1314,641
1985-11-21$4.23$4.2381,990
1985-11-20$4.13$4.1315,440
1985-11-19$4.23$4.2336,469
1985-11-18$4.13$4.136,655
1985-11-15$4.13$4.1328,217
1985-11-14$4.23$4.230
1985-11-13$4.23$4.2326,354
1985-11-12$4.09$4.0915,440
1985-11-11$4.04$4.0412,245
1985-11-08$4.04$4.045,324
1985-11-07$4.23$4.2318,368
1985-11-06$4.13$4.132,662
1985-11-05$4.27$4.2712,511
1985-11-04$4.23$4.2360,694
1985-11-01$4.27$4.2742,592
1985-10-31$4.27$4.274,259
1985-10-30$4.27$4.2721,828
1985-10-29$4.27$4.2734,872
1985-10-28$4.27$4.2720,231
1985-10-25$4.13$4.139,317
1985-10-24$4.13$4.1313,576
1985-10-23$3.94$3.94135,496
1985-10-22$3.66$3.666,123
1985-10-21$3.57$3.5732,743
1985-10-18$3.47$3.479,583
1985-10-17$3.57$3.5710,648
1985-10-16$3.66$3.668,252
1985-10-15$3.76$3.7623,426
1985-10-14$3.76$3.7619,166
1985-10-11$3.66$3.667,720
1985-10-10$3.76$3.766,389
1985-10-09$3.76$3.767,187
1985-10-08$3.80$3.8021,562
1985-10-07$4.09$4.0912,778
1985-10-04$4.13$4.1311,979
1985-10-03$4.13$4.138,252
1985-10-02$4.13$4.1341,527
1985-10-01$4.13$4.1310,382
1985-09-30$3.99$3.992,928
1985-09-26$3.99$3.99799
1985-09-25$4.04$4.040
1985-09-24$4.04$4.041,065
1985-09-23$3.94$3.944,259
1985-09-20$3.99$3.9943,391
1985-09-19$4.13$4.1333,541
1985-09-18$3.99$3.9917,835
1985-09-17$3.85$3.8538,333
1985-09-16$3.85$3.8522,095
1985-09-13$3.94$3.9419,433
1985-09-12$4.09$4.0924,490
1985-09-11$4.23$4.2320,497
1985-09-10$4.32$4.329,051
1985-09-09$4.46$4.46266
1985-09-06$4.41$4.419,317
1985-09-05$4.32$4.322,928
1985-09-04$4.37$4.376,389
1985-09-03$4.37$4.371,331
1985-08-30$4.37$4.372,130
1985-08-29$4.51$4.5118,634
1985-08-28$4.41$4.4116,771
1985-08-27$4.37$4.371,597
1985-08-26$4.37$4.376,389
1985-08-23$4.37$4.372,662
1985-08-22$4.37$4.3729,548
1985-08-21$4.32$4.3210,382
1985-08-20$4.32$4.328,518
1985-08-19$4.51$4.511,597
1985-08-16$4.41$4.4140,729
1985-08-15$4.41$4.41118,991
1985-08-14$4.32$4.3242,326
1985-08-13$4.23$4.23246,767
1985-08-12$4.27$4.2720,231
1985-08-09$4.27$4.275,856
1985-08-08$4.04$4.0414,641
1985-08-07$4.23$4.23103,286
1985-08-06$4.51$4.5150,844
1985-08-05$4.32$4.3229,548
1985-08-02$4.32$4.3214,641
1985-08-01$4.27$4.2726,886
1985-07-31$4.23$4.2347,117
1985-07-30$4.04$4.0413,842
1985-07-29$4.04$4.049,583
1985-07-26$4.13$4.1317,037
1985-07-25$3.94$3.9432,743
1985-07-24$4.04$4.0419,433
1985-07-23$3.94$3.9420,497
1985-07-22$3.94$3.941,331
1985-07-19$4.04$4.0421,030
1985-07-18$3.99$3.9943,657
1985-07-17$3.94$3.9476,666
1985-07-16$3.90$3.9021,562
1985-07-15$3.80$3.804,792
1985-07-12$3.85$3.8510,116
1985-07-11$3.80$3.807,986
1985-07-10$3.80$3.8016,238
1985-07-09$3.85$3.8523,159
1985-07-08$3.80$3.8048,448
1985-07-05$3.85$3.8531,412
1985-07-03$3.80$3.8048,981
1985-07-02$3.94$3.9468,147
1985-07-01$3.66$3.66206,837
1985-06-28$3.38$3.3832,476
1985-06-27$3.38$3.380
1985-06-26$3.38$3.38266
1985-06-25$3.33$3.3312,778
1985-06-24$3.33$3.3315,440
1985-06-21$3.19$3.1916,504
1985-06-20$3.29$3.29141,352
1985-06-19$3.15$3.15556,890
1985-06-18$3.29$3.2936,203
1985-06-17$3.38$3.3842,326
1985-06-14$3.29$3.2937,800
1985-06-13$3.38$3.3833,009
1985-06-12$3.38$3.3818,102
1985-06-11$3.38$3.38166,109
1985-06-10$3.38$3.3847,916
1985-06-07$3.29$3.29151,468
1985-06-06$3.19$3.1914,907
1985-06-05$3.19$3.193,194
1985-06-04$3.10$3.1024,757
1985-06-03$3.15$3.1583,321
1985-05-31$3.15$3.1543,923
1985-05-30$3.01$3.012,396
1985-05-29$3.10$3.1052,974
1985-05-28$3.15$3.1566,284
1985-05-24$3.10$3.10181,548
1985-05-23$3.10$3.1021,296
1985-05-22$3.29$3.2923,426
1985-05-21$3.19$3.1934,606
1985-05-20$3.29$3.2923,426
1985-05-17$3.24$3.2435,937
1985-05-16$3.29$3.29166,375
1985-05-15$3.05$3.0515,706
1985-05-14$3.15$3.1529,016
1985-05-13$3.01$3.0158,032
1985-05-10$2.96$2.9660,427
1985-05-09$2.91$2.91201,247
1985-05-08$2.82$2.82860,625
1985-05-07$2.68$2.6869,744
1985-05-06$2.72$2.7267,615
1985-05-03$2.72$2.7236,736
1985-05-02$2.86$2.8632,743
1985-05-01$2.96$2.9619,965
1985-04-30$2.91$2.91532
1985-04-29$2.96$2.960
1985-04-26$2.96$2.96799
1985-04-25$2.96$2.96532
1985-04-24$2.96$2.9614,641
1985-04-23$3.01$3.018,252
1985-04-22$3.01$3.013,727
1985-04-19$3.01$3.0111,180
1985-04-18$3.05$3.0587,047
1985-04-17$3.01$3.0114,109
1985-04-16$2.96$2.9624,757
1985-04-15$3.10$3.105,324
1985-04-12$3.10$3.104,525
1985-04-11$3.15$3.1515,440
1985-04-10$3.19$3.195,324
1985-04-09$3.19$3.192,396
1985-04-08$3.15$3.15799
1985-04-04$3.10$3.10799
1985-04-03$3.19$3.192,928
1985-04-02$3.01$3.011,331
1985-04-01$3.19$3.1943,923
1985-03-29$3.10$3.105,590
1985-03-28$3.29$3.296,123
1985-03-27$3.29$3.290
1985-03-26$3.29$3.29532
1985-03-25$3.19$3.192,130
1985-03-22$3.38$3.383,993
1985-03-21$3.19$3.19532
1985-03-20$3.38$3.381,331
1985-03-19$3.19$3.1941,261
1985-03-18$3.29$3.2915,972
1985-03-15$3.47$3.474,259
1985-03-14$3.47$3.47532
1985-03-13$3.52$3.5216,771
1985-03-12$3.47$3.4718,102
1985-03-11$3.62$3.623,461
1985-03-08$3.62$3.6228,750
1985-03-07$3.52$3.5264,687
1985-03-06$3.62$3.620
1985-03-05$3.62$3.6244,189
1985-03-04$3.52$3.529,849
1985-03-01$3.52$3.525,058
1985-02-28$3.52$3.521,065
1985-02-27$3.52$3.5215,440
1985-02-26$3.52$3.523,727
1985-02-25$3.52$3.522,130
1985-02-22$3.71$3.7116,771
1985-02-21$3.66$3.6669,744
1985-02-20$3.43$3.4312,778
1985-02-19$3.47$3.473,461
1985-02-15$3.38$3.383,993
1985-02-14$3.38$3.3813,044
1985-02-13$3.38$3.389,849
1985-02-12$3.24$3.2424,224
1985-02-11$3.29$3.2942,326
1985-02-08$3.19$3.191,863
1985-02-07$3.19$3.197,187
1985-02-06$3.19$3.1929,548
1985-02-05$3.10$3.1043,391
1985-02-04$3.01$3.0141,793
1985-02-01$2.82$2.8222,095
1985-01-31$2.86$2.8621,828
1985-01-30$2.77$2.7769,744
1985-01-29$2.86$2.8699,825
1985-01-28$2.77$2.77142,417
1985-01-25$2.77$2.77260,876
1985-01-24$2.63$2.63147,475
1985-01-23$2.58$2.583,993
1985-01-22$2.58$2.5874,270
1985-01-21$2.58$2.5818,900
1985-01-18$2.54$2.5484,652
1985-01-17$2.44$2.4422,893
1985-01-16$2.35$2.352,396
1985-01-15$2.35$2.350
1985-01-14$2.35$2.350
1985-01-11$2.35$2.355,324
1985-01-10$2.39$2.3914,641
1985-01-09$2.35$2.351,065
1985-01-08$2.35$2.355,590
1985-01-07$2.35$2.356,921
1985-01-04$2.39$2.390
1985-01-03$2.39$2.398,518
1985-01-02$2.39$2.399,317