NASDAQ:SEIC | Historical Stock Price | SEI INVESTMENTS CO

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
1981-03-25 to 2026-09-04
Data captured

Stock Price Chart

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

$0.18$0.70$2.72$10.58$41.07$159.491981-03-252026-08-27

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$9.92$10.31115,200
1999-12-30$10.15$10.55276,000
1999-12-29$10.55$10.97220,800
1999-12-28$10.11$10.51242,400
1999-12-27$10.16$10.57302,400
1999-12-23$9.98$10.38376,800
1999-12-22$10.23$10.64540,000
1999-12-21$10.75$11.181,227,600
1999-12-20$9.88$10.27608,400
1999-12-17$9.65$10.03873,600
1999-12-16$9.52$9.90962,400
1999-12-15$9.58$9.97919,200
1999-12-14$9.31$9.68595,200
1999-12-13$9.38$9.75279,600
1999-12-10$9.38$9.75663,600
1999-12-09$9.51$9.88460,800
1999-12-08$9.52$9.90787,200
1999-12-07$9.49$9.87654,000
1999-12-06$9.11$9.481,348,800
1999-12-03$8.56$8.90200,400
1999-12-02$8.50$8.84589,200
1999-12-01$8.57$8.92334,800
1999-11-30$8.45$8.79405,600
1999-11-29$8.42$8.75268,800
1999-11-26$8.35$8.6915,600
1999-11-24$8.42$8.75260,400
1999-11-23$8.44$8.77586,800
1999-11-22$8.21$8.54312,000
1999-11-19$8.30$8.63127,200
1999-11-18$8.38$8.71337,200
1999-11-17$8.28$8.61369,600
1999-11-16$8.05$8.37360,000
1999-11-15$8.16$8.49477,600
1999-11-12$8.33$8.67302,400
1999-11-11$8.17$8.50132,000
1999-11-10$8.07$8.40595,200
1999-11-09$8.26$8.59206,400
1999-11-08$8.30$8.63186,000
1999-11-05$8.40$8.73142,800
1999-11-04$8.30$8.63526,800
1999-11-03$8.42$8.75196,800
1999-11-02$8.40$8.73313,200
1999-11-01$7.99$8.31214,800
1999-10-29$8.12$8.45585,600
1999-10-28$8.05$8.37745,200
1999-10-27$8.17$8.49918,000
1999-10-26$8.17$8.491,066,800
1999-10-25$7.92$8.23865,200
1999-10-22$7.89$8.20841,200
1999-10-21$7.17$7.45848,400
1999-10-20$7.39$7.69454,800
1999-10-19$6.91$7.181,197,600
1999-10-18$7.07$7.36808,800
1999-10-15$6.66$6.921,244,400
1999-10-14$7.04$7.32456,000
1999-10-13$7.04$7.32201,600
1999-10-12$7.34$7.641,141,200
1999-10-11$7.45$7.75240,000
1999-10-08$7.40$7.69489,600
1999-10-07$7.34$7.63657,600
1999-10-06$7.19$7.471,396,800
1999-10-05$7.02$7.30567,600
1999-10-04$7.23$7.52316,800
1999-10-01$7.20$7.49372,000
1999-09-30$7.44$7.74399,600
1999-09-29$7.50$7.80338,400
1999-09-28$7.49$7.79588,000
1999-09-27$7.54$7.841,131,600
1999-09-24$7.44$7.73825,600
1999-09-23$7.56$7.86271,200
1999-09-22$7.69$8.00291,600
1999-09-21$7.77$8.08211,200
1999-09-20$7.71$8.02230,400
1999-09-17$7.76$8.07316,800
1999-09-16$7.78$8.09327,600
1999-09-15$7.84$8.16159,600
1999-09-14$7.86$8.18153,600
1999-09-13$7.79$8.10157,200
1999-09-10$7.96$8.28237,600
1999-09-09$7.81$8.12254,400
1999-09-08$7.80$8.11291,600
1999-09-07$7.79$8.10262,800
1999-09-03$7.84$8.16398,400
1999-09-02$7.93$8.24858,000
1999-09-01$7.58$7.89224,400
1999-08-31$7.66$7.97444,000
1999-08-30$7.75$8.06433,200
1999-08-27$7.69$7.99360,000
1999-08-26$7.97$8.29116,400
1999-08-25$8.05$8.3794,800
1999-08-24$8.06$8.38312,000
1999-08-23$8.20$8.53162,000
1999-08-20$8.09$8.4281,600
1999-08-19$8.09$8.42112,800
1999-08-18$8.19$8.52363,600
1999-08-17$8.16$8.48200,400
1999-08-16$8.19$8.51192,000
1999-08-13$8.26$8.59398,400
1999-08-12$8.23$8.56307,200
1999-08-11$7.99$8.31595,200
1999-08-10$7.92$8.23445,200
1999-08-09$7.71$8.02146,400
1999-08-06$7.81$8.12994,800
1999-08-05$7.89$8.21730,800
1999-08-04$7.89$8.21266,400
1999-08-03$7.95$8.27810,000
1999-08-02$7.77$8.08340,800
1999-07-30$8.06$8.38650,400
1999-07-29$7.91$8.22513,600
1999-07-28$7.76$8.06846,000
1999-07-27$7.96$8.28333,600
1999-07-26$8.02$8.34396,000
1999-07-23$8.25$8.58253,200
1999-07-22$8.17$8.49199,200
1999-07-21$8.50$8.84304,800
1999-07-20$8.14$8.46566,400
1999-07-19$8.23$8.56753,600
1999-07-16$8.19$8.51445,200
1999-07-15$8.19$8.51430,800
1999-07-14$8.01$8.33403,200
1999-07-13$8.19$8.52210,000
1999-07-12$8.42$8.75824,400
1999-07-09$8.36$8.70304,800
1999-07-08$8.33$8.66499,200
1999-07-07$8.18$8.51361,200
1999-07-06$8.41$8.751,004,400
1999-07-02$8.10$8.43600,000
1999-07-01$8.02$8.34625,200
1999-06-30$7.35$7.651,840,800
1999-06-29$8.08$8.40589,200
1999-06-28$8.00$8.32426,000
1999-06-25$8.25$8.58129,600
1999-06-24$8.29$8.62589,200
1999-06-23$8.51$8.84572,400
1999-06-22$8.28$8.61246,000
1999-06-21$8.33$8.66166,800
1999-06-18$8.33$8.67366,000
1999-06-17$8.52$8.86544,800
1999-06-16$8.28$8.61190,800
1999-06-15$8.13$8.45120,000
1999-06-14$8.17$8.49288,000
1999-06-11$8.34$8.67210,000
1999-06-10$8.54$8.87210,000
1999-06-09$8.68$9.01278,400
1999-06-08$8.45$8.78571,200
1999-06-07$8.54$8.87236,400
1999-06-04$8.50$8.83561,600
1999-06-03$8.35$8.68258,000
1999-06-02$8.66$9.00592,800
1999-06-01$8.83$9.17770,400
1999-05-28$8.50$8.83427,200
1999-05-27$8.50$8.83462,000
1999-05-26$8.17$8.48654,000
1999-05-25$8.11$8.43530,400
1999-05-24$8.24$8.57240,000
1999-05-21$8.33$8.66424,800
1999-05-20$8.21$8.53170,400
1999-05-19$8.10$8.42313,200
1999-05-18$8.10$8.4272,000
1999-05-17$8.05$8.36225,600
1999-05-14$8.10$8.42411,600
1999-05-13$8.25$8.57176,400
1999-05-12$8.21$8.53177,600
1999-05-11$8.33$8.66907,200
1999-05-10$8.33$8.65469,200
1999-05-07$8.07$8.38343,200
1999-05-06$7.98$8.29692,400
1999-05-05$8.18$8.50780,000
1999-05-04$8.02$8.33326,400
1999-05-03$8.00$8.31542,400
1999-04-30$7.92$8.22662,400
1999-04-29$7.72$8.02481,200
1999-04-28$7.79$8.09469,200
1999-04-27$7.63$7.921,551,600
1999-04-26$7.43$7.722,436,000
1999-04-23$7.16$7.44513,600
1999-04-22$7.38$7.671,144,800
1999-04-21$6.88$7.143,531,600
1999-04-20$6.81$7.071,587,600
1999-04-19$6.96$7.232,527,200
1999-04-16$6.89$7.16962,400
1999-04-15$6.83$7.10774,000
1999-04-14$6.99$7.271,112,400
1999-04-13$6.98$7.25670,800
1999-04-12$7.25$7.53846,000
1999-04-09$7.47$7.762,242,800
1999-04-08$6.61$6.872,234,400
1999-04-07$7.09$7.361,264,800
1999-04-06$7.26$7.54668,400
1999-04-05$7.92$8.231,570,800
1999-04-01$7.38$7.661,269,600
1999-03-31$7.71$8.011,059,600
1999-03-30$8.28$8.60516,000
1999-03-29$7.95$8.26348,000
1999-03-26$7.98$8.291,522,800
1999-03-25$7.99$8.311,185,600
1999-03-24$7.89$8.19688,800
1999-03-23$8.18$8.50242,400
1999-03-22$8.40$8.72262,800
1999-03-19$8.34$8.67414,000
1999-03-18$8.48$8.81312,000
1999-03-17$8.75$9.09313,200
1999-03-16$8.67$9.00316,800
1999-03-15$9.04$9.39231,600
1999-03-12$9.12$9.47574,800
1999-03-11$8.88$9.221,738,800
1999-03-10$8.39$8.72165,600
1999-03-09$8.30$8.62141,600
1999-03-08$8.38$8.70540,000
1999-03-05$8.40$8.72390,000
1999-03-04$8.36$8.69222,000
1999-03-03$8.50$8.83769,200
1999-03-02$8.69$9.03609,600
1999-03-01$8.36$8.69194,400
1999-02-26$8.25$8.57424,800
1999-02-25$8.17$8.48805,200
1999-02-24$8.21$8.531,232,400
1999-02-23$8.11$8.42885,600
1999-02-22$7.95$8.26222,000
1999-02-19$7.69$7.99448,800
1999-02-18$7.63$7.92417,600
1999-02-17$7.50$7.79571,200
1999-02-16$7.79$8.09930,000
1999-02-12$7.83$8.14595,200
1999-02-11$8.15$8.46861,600
1999-02-10$8.03$8.341,269,600
1999-02-09$7.84$8.152,001,600
1999-02-08$8.59$8.92560,400
1999-02-05$8.54$8.87285,600
1999-02-04$8.77$9.11348,000
1999-02-03$9.08$9.44825,600
1999-02-02$9.30$9.66466,800
1999-02-01$9.50$9.87630,000
1999-01-29$9.59$9.97421,200
1999-01-28$9.79$10.171,236,000
1999-01-27$9.25$9.611,082,400
1999-01-26$8.81$9.161,226,400
1999-01-25$8.63$8.96447,600
1999-01-22$8.79$9.13387,600
1999-01-21$8.50$8.83686,400
1999-01-20$8.87$9.21367,200
1999-01-19$8.65$8.99578,400
1999-01-15$8.71$9.05253,200
1999-01-14$8.37$8.70369,600
1999-01-13$8.38$8.70622,800
1999-01-12$8.31$8.641,374,000
1999-01-11$8.63$8.96250,800
1999-01-08$8.64$8.971,785,600
1999-01-07$8.75$9.093,268,800
1999-01-06$8.79$9.133,796,800
1999-01-05$7.96$8.27919,200
1999-01-04$8.13$8.44980,400