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 — 1998

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
1998-12-31$8.28$8.60691,200
1998-12-30$8.29$8.61316,800
1998-12-29$8.18$8.49214,800
1998-12-28$8.17$8.481,261,200
1998-12-24$8.29$8.6170,800
1998-12-23$8.17$8.48344,400
1998-12-22$8.10$8.41308,400
1998-12-21$8.33$8.65590,400
1998-12-18$7.93$8.23762,000
1998-12-17$7.95$8.26568,800
1998-12-16$7.48$7.76778,800
1998-12-15$7.94$8.24296,400
1998-12-14$7.76$8.06816,000
1998-12-11$7.92$8.22704,400
1998-12-10$8.14$8.45314,400
1998-12-09$8.19$8.50266,400
1998-12-08$8.08$8.39196,800
1998-12-07$8.17$8.481,184,400
1998-12-04$7.84$8.14760,800
1998-12-03$7.73$8.02940,800
1998-12-02$7.82$8.12178,800
1998-12-01$7.92$8.22577,200
1998-11-30$7.69$7.98786,000
1998-11-27$8.10$8.41123,600
1998-11-25$8.11$8.42607,200
1998-11-24$8.17$8.481,225,200
1998-11-23$8.30$8.621,291,200
1998-11-20$7.83$8.13350,400
1998-11-19$7.75$8.04640,800
1998-11-18$7.67$7.96663,600
1998-11-17$7.58$7.87765,600
1998-11-16$7.55$7.84493,200
1998-11-13$7.40$7.68495,600
1998-11-12$7.46$7.751,231,200
1998-11-11$7.33$7.611,142,400
1998-11-10$7.31$7.59364,800
1998-11-09$7.23$7.50520,800
1998-11-06$7.22$7.491,837,200
1998-11-05$7.27$7.551,242,000
1998-11-04$7.32$7.601,374,000
1998-11-03$7.24$7.523,400,800
1998-11-02$7.00$7.271,314,000
1998-10-30$6.91$7.173,074,400
1998-10-29$6.58$6.83542,400
1998-10-28$6.58$6.831,255,200
1998-10-27$6.30$6.54751,200
1998-10-26$6.33$6.57804,000
1998-10-23$6.24$6.48613,200
1998-10-22$6.29$6.53376,800
1998-10-21$6.27$6.511,887,600
1998-10-20$6.33$6.571,524,000
1998-10-19$6.23$6.47978,000
1998-10-16$5.98$6.211,557,600
1998-10-15$5.89$6.11990,000
1998-10-14$5.23$5.43787,200
1998-10-13$5.05$5.24835,200
1998-10-12$5.00$5.19564,000
1998-10-09$4.97$5.162,119,200
1998-10-08$4.75$4.931,693,200
1998-10-07$4.48$4.651,365,600
1998-10-06$4.76$4.941,718,400
1998-10-05$5.15$5.343,154,800
1998-10-02$5.48$5.691,652,400
1998-10-01$5.53$5.741,149,600
1998-09-30$5.79$6.011,166,400
1998-09-29$5.83$6.06267,600
1998-09-28$5.65$5.86428,400
1998-09-25$5.82$6.04457,200
1998-09-24$5.81$6.03387,600
1998-09-23$5.92$6.141,064,400
1998-09-22$5.77$5.99319,200
1998-09-21$5.73$5.95351,600
1998-09-18$5.96$6.19594,000
1998-09-17$5.59$5.81354,000
1998-09-16$5.85$6.08902,400
1998-09-15$5.78$6.00409,200
1998-09-14$5.74$5.961,410,000
1998-09-11$5.67$5.88760,800
1998-09-10$5.54$5.751,826,400
1998-09-09$5.63$5.841,394,400
1998-09-08$5.72$5.941,623,600
1998-09-04$5.48$5.69811,200
1998-09-03$5.42$5.622,484,000
1998-09-02$5.61$5.821,638,000
1998-09-01$5.49$5.704,920,000
1998-08-31$5.19$5.381,752,000
1998-08-28$5.71$5.93922,800
1998-08-27$5.79$6.012,218,800
1998-08-26$6.33$6.57502,800
1998-08-25$6.42$6.66802,800
1998-08-24$6.28$6.51399,600
1998-08-21$6.33$6.57654,000
1998-08-20$6.43$6.67570,000
1998-08-19$6.39$6.63506,400
1998-08-18$6.60$6.861,426,800
1998-08-17$6.21$6.44511,200
1998-08-14$6.20$6.43525,600
1998-08-13$6.23$6.47387,600
1998-08-12$6.25$6.49360,000
1998-08-11$6.23$6.47655,200
1998-08-10$6.29$6.53396,000
1998-08-07$6.23$6.47399,600
1998-08-06$6.25$6.49271,200
1998-08-05$6.03$6.261,564,800
1998-08-04$5.96$6.191,557,600
1998-08-03$6.25$6.491,027,200
1998-07-31$6.24$6.48573,600
1998-07-30$6.33$6.57751,200
1998-07-29$6.35$6.60429,600
1998-07-28$6.32$6.56740,400
1998-07-27$6.25$6.49350,400
1998-07-24$6.25$6.49927,600
1998-07-23$6.27$6.51638,400
1998-07-22$6.36$6.601,100,400
1998-07-21$6.35$6.604,770,000
1998-07-20$6.08$6.31864,000
1998-07-17$6.04$6.27536,400
1998-07-16$6.03$6.261,216,800
1998-07-15$5.77$5.99312,000
1998-07-14$5.71$5.93643,200
1998-07-13$5.75$5.97206,400
1998-07-10$5.79$6.01580,800
1998-07-09$5.93$6.151,264,800
1998-07-08$5.92$6.141,122,000
1998-07-07$5.58$5.802,214,000
1998-07-06$5.39$5.592,142,000
1998-07-02$5.21$5.412,155,200
1998-07-01$5.00$5.19992,400
1998-06-30$5.17$5.36482,400
1998-06-29$5.29$5.49228,000
1998-06-26$5.38$5.58244,800
1998-06-25$5.44$5.64199,200
1998-06-24$5.48$5.69681,600
1998-06-23$5.42$5.62614,400
1998-06-22$5.35$5.561,009,200
1998-06-19$5.33$5.54145,200
1998-06-18$5.25$5.45410,400
1998-06-17$5.50$5.71764,400
1998-06-16$5.17$5.36321,600
1998-06-15$5.15$5.34526,800
1998-06-12$5.16$5.36669,600
1998-06-11$5.17$5.361,260,000
1998-06-10$5.33$5.52696,000
1998-06-09$5.50$5.70354,000
1998-06-08$5.53$5.73298,800
1998-06-05$5.46$5.66120,000
1998-06-04$5.51$5.71297,600
1998-06-03$5.51$5.71340,800
1998-06-02$5.59$5.79144,000
1998-06-01$5.57$5.78610,800
1998-05-29$5.56$5.77144,000
1998-05-28$5.58$5.78570,000
1998-05-27$5.51$5.71700,800
1998-05-26$5.60$5.81621,600
1998-05-22$5.88$6.09370,800
1998-05-21$5.93$6.14428,400
1998-05-20$5.98$6.20222,000
1998-05-19$6.09$6.32806,400
1998-05-18$6.11$6.34931,200
1998-05-15$5.81$6.03150,000
1998-05-14$5.80$6.02100,800
1998-05-13$5.90$6.11274,800
1998-05-12$5.88$6.09252,000
1998-05-11$5.92$6.13232,800
1998-05-08$6.00$6.22249,600
1998-05-07$5.89$6.11934,800
1998-05-06$6.15$6.38118,800
1998-05-05$6.21$6.44178,800
1998-05-04$6.24$6.47364,800
1998-05-01$6.19$6.41309,600
1998-04-30$6.16$6.38468,000
1998-04-29$6.08$6.31319,200
1998-04-28$6.02$6.24354,000
1998-04-27$6.04$6.26549,600
1998-04-24$6.27$6.50422,400
1998-04-23$6.22$6.451,081,200
1998-04-22$6.08$6.311,188,000
1998-04-21$6.02$6.24705,600
1998-04-20$6.06$6.29685,200
1998-04-17$6.23$6.46330,000
1998-04-16$6.17$6.39164,400
1998-04-15$6.13$6.35262,800
1998-04-14$6.13$6.35537,600
1998-04-13$6.16$6.391,321,200
1998-04-09$5.73$5.941,220,400
1998-04-08$5.46$5.66368,400
1998-04-07$5.50$5.70630,000
1998-04-06$5.71$5.92272,400
1998-04-03$5.72$5.93295,200
1998-04-02$5.83$6.05528,000
1998-04-01$5.88$6.09699,600
1998-03-31$5.69$5.902,389,200
1998-03-30$5.40$5.59349,200
1998-03-27$5.42$5.62366,000
1998-03-26$5.39$5.58331,200
1998-03-25$5.35$5.55304,800
1998-03-24$5.45$5.65318,000
1998-03-23$5.41$5.60249,600
1998-03-20$5.50$5.701,432,800
1998-03-19$5.50$5.70325,200
1998-03-18$5.52$5.72402,000
1998-03-17$5.67$5.871,059,600
1998-03-16$5.67$5.87303,600
1998-03-13$5.54$5.75141,600
1998-03-12$5.58$5.79378,000
1998-03-11$5.57$5.78421,200
1998-03-10$5.44$5.642,640,000
1998-03-09$5.23$5.42270,000
1998-03-06$5.18$5.37175,200
1998-03-05$5.25$5.44759,600
1998-03-04$5.04$5.23692,400
1998-03-03$5.13$5.311,284,000
1998-03-02$5.22$5.412,968,800
1998-02-27$4.92$5.10860,400
1998-02-26$4.78$4.96129,600
1998-02-25$4.71$4.88276,000
1998-02-24$4.67$4.84198,000
1998-02-23$4.58$4.75991,200
1998-02-20$4.32$4.484,082,400
1998-02-19$4.48$4.64220,800
1998-02-18$4.40$4.56878,400
1998-02-17$4.44$4.601,552,800
1998-02-13$4.58$4.751,935,600
1998-02-12$4.23$4.381,022,400
1998-02-11$4.20$4.351,180,800
1998-02-10$4.14$4.29428,400
1998-02-09$4.04$4.191,449,600
1998-02-06$3.96$4.10678,000
1998-02-05$3.99$4.14498,000
1998-02-04$3.92$4.06336,000
1998-02-03$3.91$4.05456,000
1998-02-02$3.90$4.04642,000
1998-01-30$4.00$4.15734,400
1998-01-29$3.97$4.112,337,600
1998-01-28$3.58$3.711,099,200
1998-01-27$3.45$3.581,250,400
1998-01-26$3.38$3.50567,600
1998-01-23$3.64$3.77240,000
1998-01-22$3.66$3.79378,000
1998-01-21$3.71$3.84559,200
1998-01-20$3.76$3.901,144,800
1998-01-16$3.57$3.70843,600
1998-01-15$3.43$3.55303,600
1998-01-14$3.44$3.56921,600
1998-01-13$3.44$3.56778,800
1998-01-12$3.26$3.38614,400
1998-01-09$3.19$3.301,243,200
1998-01-08$3.43$3.55176,400
1998-01-07$3.48$3.61171,600
1998-01-06$3.46$3.59154,800
1998-01-05$3.48$3.61250,800
1998-01-02$3.54$3.67150,000