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.

View year

Historical Stock Price — 2005

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2005-12-30$18.50$19.78671,400
2005-12-29$18.81$20.11756,800
2005-12-28$18.98$20.231,101,800
2005-12-27$18.95$20.201,054,800
2005-12-23$19.03$20.29702,600
2005-12-22$19.14$20.40936,600
2005-12-21$19.18$20.451,040,400
2005-12-20$19.22$20.49706,000
2005-12-19$19.26$20.53923,000
2005-12-16$19.20$20.46714,600
2005-12-15$19.38$20.66848,600
2005-12-14$19.28$20.55986,000
2005-12-13$19.18$20.451,761,800
2005-12-12$19.48$20.761,350,200
2005-12-09$19.71$21.011,098,400
2005-12-08$19.92$21.23592,000
2005-12-07$20.25$21.58746,200
2005-12-06$20.34$21.69517,800
2005-12-05$20.30$21.64702,800
2005-12-02$20.68$22.05515,400
2005-12-01$20.91$22.29516,800
2005-11-30$20.42$21.781,182,600
2005-11-29$20.93$22.31507,000
2005-11-28$20.88$22.26702,600
2005-11-25$21.00$22.39193,600
2005-11-23$21.05$22.44833,800
2005-11-22$20.67$22.03393,200
2005-11-21$20.58$21.94636,200
2005-11-18$20.23$21.56466,000
2005-11-17$20.22$21.55989,200
2005-11-16$20.08$21.41541,400
2005-11-15$20.11$21.44884,200
2005-11-14$20.20$21.54535,000
2005-11-11$20.17$21.50552,200
2005-11-10$20.15$21.48642,000
2005-11-09$19.71$21.01700,600
2005-11-08$19.55$20.84686,400
2005-11-07$19.76$21.07487,400
2005-11-04$19.71$21.01539,400
2005-11-03$19.74$21.04606,800
2005-11-02$19.81$21.12426,800
2005-11-01$19.42$20.71592,000
2005-10-31$19.40$20.68635,600
2005-10-28$19.05$20.31579,400
2005-10-27$18.88$20.121,031,000
2005-10-26$19.11$20.37719,200
2005-10-25$19.12$20.38895,200
2005-10-24$18.97$20.221,734,200
2005-10-21$18.88$20.132,068,000
2005-10-20$19.74$21.041,202,000
2005-10-19$19.58$20.872,462,000
2005-10-18$17.56$18.72681,600
2005-10-17$17.79$18.97419,000
2005-10-14$17.86$19.04395,400
2005-10-13$17.91$19.09611,000
2005-10-12$17.84$19.03804,600
2005-10-11$17.88$19.06584,400
2005-10-10$18.22$19.42341,200
2005-10-07$18.23$19.43521,800
2005-10-06$18.24$19.441,010,600
2005-10-05$18.20$19.40678,000
2005-10-04$18.64$19.87443,800
2005-10-03$18.83$20.08506,400
2005-09-30$18.79$20.03458,600
2005-09-29$18.69$19.93769,200
2005-09-28$18.19$19.39523,200
2005-09-27$18.17$19.37610,200
2005-09-26$18.40$19.62400,800
2005-09-23$18.19$19.39522,600
2005-09-22$18.30$19.51576,800
2005-09-21$18.10$19.30510,800
2005-09-20$18.44$19.66817,600
2005-09-19$18.65$19.88645,000
2005-09-16$18.62$19.853,836,600
2005-09-15$18.50$19.73481,400
2005-09-14$18.53$19.76559,400
2005-09-13$18.60$19.83481,600
2005-09-12$18.71$19.95724,000
2005-09-09$18.43$19.65901,000
2005-09-08$18.34$19.56891,600
2005-09-07$18.49$19.71575,200
2005-09-06$18.68$19.92601,800
2005-09-02$18.26$19.47396,600
2005-09-01$18.24$19.44463,800
2005-08-31$18.08$19.28492,600
2005-08-30$17.92$19.11569,000
2005-08-29$18.24$19.45508,000
2005-08-26$18.15$19.35609,400
2005-08-25$18.42$19.64608,400
2005-08-24$18.04$19.23568,800
2005-08-23$18.27$19.48602,600
2005-08-22$18.37$19.58456,200
2005-08-19$18.20$19.40213,000
2005-08-18$18.24$19.44540,000
2005-08-17$18.45$19.67403,000
2005-08-16$18.48$19.70537,800
2005-08-15$18.88$20.12836,400
2005-08-12$18.90$20.14673,800
2005-08-11$19.26$20.54477,800
2005-08-10$19.02$20.28532,400
2005-08-09$18.93$20.18454,800
2005-08-08$18.91$20.16432,600
2005-08-05$18.92$20.17560,600
2005-08-04$19.12$20.38430,400
2005-08-03$19.50$20.78378,800
2005-08-02$19.45$20.74572,000
2005-08-01$19.39$20.67515,800
2005-07-29$19.33$20.61494,000
2005-07-28$19.42$20.70536,600
2005-07-27$19.40$20.68440,800
2005-07-26$19.15$20.41616,600
2005-07-25$19.00$20.26774,800
2005-07-22$19.50$20.79833,000
2005-07-21$19.50$20.80890,000
2005-07-20$20.26$21.61736,600
2005-07-19$19.53$20.82419,600
2005-07-18$19.55$20.84470,000
2005-07-15$19.55$20.84594,600
2005-07-14$19.34$20.62486,200
2005-07-13$19.15$20.42403,600
2005-07-12$19.59$20.89362,800
2005-07-11$19.52$20.81462,800
2005-07-08$19.06$20.32323,000
2005-07-07$18.79$20.03536,600
2005-07-06$18.92$20.18357,000
2005-07-05$19.11$20.37375,400
2005-07-01$19.04$20.30600,800
2005-06-30$18.67$19.91504,400
2005-06-29$18.83$20.07509,600
2005-06-28$18.89$20.14570,600
2005-06-27$18.64$19.87786,200
2005-06-24$18.69$19.93850,000
2005-06-23$18.88$20.13607,800
2005-06-22$19.15$20.42639,200
2005-06-21$19.13$20.39615,000
2005-06-20$19.03$20.29474,800
2005-06-17$19.19$20.461,424,000
2005-06-16$19.17$20.43622,000
2005-06-15$18.73$19.96574,600
2005-06-14$18.80$20.04563,200
2005-06-13$18.49$19.71590,200
2005-06-10$18.56$19.78860,400
2005-06-09$18.57$19.80711,400
2005-06-08$18.11$19.30389,400
2005-06-07$18.21$19.41583,200
2005-06-06$18.20$19.40977,800
2005-06-03$17.83$18.95732,400
2005-06-02$17.85$18.97876,800
2005-06-01$17.84$18.961,094,600
2005-05-31$17.38$18.471,498,000
2005-05-27$17.24$18.32425,200
2005-05-26$17.09$18.17581,400
2005-05-25$16.91$17.97599,400
2005-05-24$16.97$18.04697,000
2005-05-23$17.00$18.06579,200
2005-05-20$16.77$17.82541,200
2005-05-19$16.63$17.68808,800
2005-05-18$16.61$17.65800,600
2005-05-17$16.44$17.47815,000
2005-05-16$16.36$17.39838,200
2005-05-13$16.17$17.19925,400
2005-05-12$16.32$17.35730,600
2005-05-11$16.42$17.45807,400
2005-05-10$16.38$17.40721,200
2005-05-09$16.46$17.491,031,000
2005-05-06$16.47$17.51840,200
2005-05-05$16.52$17.56853,800
2005-05-04$16.63$17.681,015,800
2005-05-03$16.39$17.42799,600
2005-05-02$16.41$17.44654,200
2005-04-29$16.41$17.44746,000
2005-04-28$16.08$17.09643,600
2005-04-27$16.38$17.40729,600
2005-04-26$16.34$17.37625,200
2005-04-25$16.76$17.81366,600
2005-04-22$16.38$17.41563,000
2005-04-21$16.96$18.02659,200
2005-04-20$16.48$17.51838,400
2005-04-19$16.86$17.91453,600
2005-04-18$16.68$17.73472,200
2005-04-15$16.56$17.60584,000
2005-04-14$16.88$17.94566,400
2005-04-13$17.18$18.27429,200
2005-04-12$17.46$18.55896,600
2005-04-11$17.58$18.69768,800
2005-04-08$17.92$19.05590,800
2005-04-07$17.99$19.12515,200
2005-04-06$17.92$19.05321,200
2005-04-05$17.91$19.04445,200
2005-04-04$18.01$19.15649,200
2005-04-01$17.83$18.96751,600
2005-03-31$18.08$19.22803,400
2005-03-30$18.06$19.19806,600
2005-03-29$17.92$19.05867,800
2005-03-28$17.93$19.06588,600
2005-03-24$17.99$19.12479,800
2005-03-23$18.08$19.21635,600
2005-03-22$18.39$19.55624,000
2005-03-21$18.66$19.83787,200
2005-03-18$18.56$19.732,210,000
2005-03-17$18.49$19.65530,200
2005-03-16$18.50$19.66747,000
2005-03-15$18.54$19.701,082,000
2005-03-14$18.67$19.85887,400
2005-03-11$18.25$19.39525,200
2005-03-10$18.33$19.48447,800
2005-03-09$18.37$19.52435,800
2005-03-08$18.54$19.71737,800
2005-03-07$18.75$19.92707,000
2005-03-04$18.74$19.92348,800
2005-03-03$18.52$19.68512,400
2005-03-02$18.83$20.02619,000
2005-03-01$18.90$20.08885,200
2005-02-28$18.48$19.64618,000
2005-02-25$18.46$19.62633,800
2005-02-24$18.25$19.39663,800
2005-02-23$17.91$19.04747,000
2005-02-22$17.93$19.06565,400
2005-02-18$18.30$19.45501,600
2005-02-17$18.34$19.49491,400
2005-02-16$18.59$19.76590,600
2005-02-15$18.67$19.841,055,400
2005-02-14$18.35$19.50979,400
2005-02-11$18.22$19.361,798,200
2005-02-10$18.02$19.151,245,000
2005-02-09$18.08$19.22968,800
2005-02-08$18.50$19.661,234,600
2005-02-07$18.58$19.741,478,200
2005-02-04$18.63$19.801,261,400
2005-02-03$18.13$19.261,009,200
2005-02-02$18.83$20.02756,400
2005-02-01$18.76$19.94754,600
2005-01-31$18.68$19.851,443,000
2005-01-28$18.20$19.34974,200
2005-01-27$18.37$19.52950,800
2005-01-26$18.50$19.66811,000
2005-01-25$18.53$19.69658,600
2005-01-24$18.50$19.661,144,600
2005-01-21$19.01$20.21701,000
2005-01-20$19.07$20.27530,800
2005-01-19$19.19$20.40767,800
2005-01-18$19.63$20.861,094,400
2005-01-14$19.29$20.501,215,400
2005-01-13$18.81$19.99846,000
2005-01-12$19.16$20.361,768,200
2005-01-11$18.94$20.13987,200
2005-01-10$19.34$20.56667,000
2005-01-07$19.50$20.72805,000
2005-01-06$19.39$20.601,669,000
2005-01-05$19.97$21.22761,400
2005-01-04$20.17$21.43876,200
2005-01-03$20.42$21.711,118,000