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 — 2018

DateSplit-adjusted closeCumulative dividend-reinvested closeReported volumeOpen priceExchange Volume
2018-12-31$46.20$57.26671,500
2018-12-28$45.56$56.47687,300
2018-12-27$45.45$56.33967,600
2018-12-26$44.60$55.28906,100
2018-12-24$42.83$52.68644,800
2018-12-21$43.66$53.702,267,100
2018-12-20$44.70$54.981,174,500
2018-12-19$46.24$56.871,017,100
2018-12-18$47.22$58.081,142,300
2018-12-17$46.89$57.67947,600
2018-12-14$48.41$59.54700,400
2018-12-13$48.70$59.90777,700
2018-12-12$49.49$60.87652,800
2018-12-11$48.47$59.611,377,200
2018-12-10$49.18$60.49786,900
2018-12-07$49.40$60.761,144,400
2018-12-06$51.32$63.121,152,400
2018-12-04$51.31$63.11787,000
2018-12-03$53.99$66.40737,600
2018-11-30$53.70$66.05915,900
2018-11-29$53.48$65.78710,200
2018-11-28$53.96$66.37894,100
2018-11-27$53.22$65.46987,600
2018-11-26$53.54$65.85489,500
2018-11-23$52.62$64.72248,200
2018-11-21$53.09$65.30450,900
2018-11-20$52.32$64.35962,200
2018-11-19$53.42$65.70880,300
2018-11-16$54.84$67.45763,200
2018-11-15$54.89$67.51651,300
2018-11-14$53.04$65.23314,700
2018-11-13$53.78$66.14512,300
2018-11-12$53.80$66.17672,400
2018-11-09$54.77$67.36413,100
2018-11-08$55.55$68.32442,600
2018-11-07$55.13$67.80607,500
2018-11-06$54.25$66.72460,000
2018-11-05$53.93$66.33579,300
2018-11-02$54.29$66.77510,800
2018-11-01$54.27$66.75510,300
2018-10-31$53.45$65.741,304,800
2018-10-30$53.23$65.47889,500
2018-10-29$52.46$64.521,160,300
2018-10-26$53.97$66.382,047,800
2018-10-25$53.04$65.231,945,600
2018-10-24$51.05$62.791,035,600
2018-10-23$52.66$64.771,047,400
2018-10-22$53.72$66.071,032,300
2018-10-19$54.59$67.14500,700
2018-10-18$54.77$67.36548,500
2018-10-17$56.03$68.91380,200
2018-10-16$56.06$68.95538,700
2018-10-15$55.10$67.77356,700
2018-10-12$54.94$67.57610,800
2018-10-11$54.83$67.441,059,100
2018-10-10$56.05$68.94628,000
2018-10-09$58.25$71.64865,700
2018-10-08$59.16$72.76431,800
2018-10-05$59.65$73.36456,900
2018-10-04$60.05$73.86401,800
2018-10-03$60.47$74.37514,600
2018-10-02$59.53$73.22573,900
2018-10-01$60.20$74.04574,400
2018-09-28$61.10$75.15812,400
2018-09-27$61.42$75.54491,700
2018-09-26$61.58$75.74852,600
2018-09-25$62.01$76.27625,600
2018-09-24$62.17$76.461,049,500
2018-09-21$61.74$75.931,666,700
2018-09-20$62.78$77.21799,700
2018-09-19$62.59$76.98530,600
2018-09-18$62.69$77.10503,900
2018-09-17$62.47$76.83763,900
2018-09-14$63.83$78.50629,900
2018-09-13$63.43$78.01908,900
2018-09-12$63.07$77.57545,300
2018-09-11$62.95$77.42625,400
2018-09-10$61.87$76.09370,900
2018-09-07$61.59$75.75449,200
2018-09-06$61.97$76.22643,100
2018-09-05$63.18$77.71727,600
2018-09-04$63.50$78.10633,100
2018-08-31$63.08$77.58695,500
2018-08-30$63.13$77.64687,800
2018-08-29$62.86$77.31309,200
2018-08-28$62.85$77.30585,700
2018-08-27$62.93$77.40382,400
2018-08-24$62.24$76.55394,400
2018-08-23$62.10$76.38514,600
2018-08-22$62.09$76.36465,500
2018-08-21$61.35$75.45480,200
2018-08-20$61.37$75.48448,300
2018-08-17$60.38$74.26558,600
2018-08-16$60.32$74.19495,700
2018-08-15$59.98$73.77648,400
2018-08-14$60.76$74.73529,700
2018-08-13$59.47$73.14885,400
2018-08-10$59.52$73.20647,900
2018-08-09$59.61$73.31437,200
2018-08-08$60.30$74.16433,200
2018-08-07$60.00$73.79562,000
2018-08-06$60.01$73.81538,800
2018-08-03$59.77$73.51389,000
2018-08-02$59.32$72.96424,100
2018-08-01$59.14$72.74689,600
2018-07-31$59.94$73.721,236,400
2018-07-30$60.37$74.25438,200
2018-07-27$60.38$74.26543,900
2018-07-26$60.97$74.99477,600
2018-07-25$61.24$75.32874,300
2018-07-24$60.73$74.69790,100
2018-07-23$61.94$76.181,017,600
2018-07-20$60.87$74.861,217,500
2018-07-19$64.36$79.16529,500
2018-07-18$64.70$79.57495,900
2018-07-17$64.21$78.97466,300
2018-07-16$64.18$78.94422,100
2018-07-13$64.21$78.97477,300
2018-07-12$64.44$79.26470,700
2018-07-11$63.85$78.53640,300
2018-07-10$64.14$78.89373,900
2018-07-09$64.38$79.18526,100
2018-07-06$63.17$77.69381,900
2018-07-05$63.05$77.55625,200
2018-07-03$63.17$77.69313,000
2018-07-02$63.15$77.67436,500
2018-06-29$62.52$76.89683,800
2018-06-28$62.79$77.23502,200
2018-06-27$62.83$77.27497,600
2018-06-26$63.57$78.19570,000
2018-06-25$64.09$78.82601,300
2018-06-22$65.16$80.141,046,000
2018-06-21$66.05$81.24384,900
2018-06-20$66.10$81.30349,500
2018-06-19$65.87$81.01407,800
2018-06-18$65.98$81.15597,600
2018-06-15$65.93$81.091,275,100
2018-06-14$65.71$80.82459,700
2018-06-13$65.53$80.60807,700
2018-06-12$66.48$81.40596,200
2018-06-11$66.64$81.59418,900
2018-06-08$66.75$81.73729,600
2018-06-07$66.50$81.42895,700
2018-06-06$67.02$82.06653,900
2018-06-05$65.35$80.01476,400
2018-06-04$65.72$80.46716,400
2018-06-01$65.42$80.10789,400
2018-05-31$63.78$78.091,346,400
2018-05-30$65.13$79.74961,400
2018-05-29$63.97$78.32659,800
2018-05-25$65.10$79.71334,200
2018-05-24$65.05$79.64836,900
2018-05-23$64.81$79.35522,400
2018-05-22$65.46$80.15513,200
2018-05-21$65.45$80.13471,400
2018-05-18$65.15$79.77843,400
2018-05-17$64.84$79.39612,500
2018-05-16$64.43$78.89562,500
2018-05-15$63.71$78.00418,800
2018-05-14$63.98$78.33990,300
2018-05-11$64.38$78.82439,000
2018-05-10$64.14$78.53633,900
2018-05-09$63.35$77.56820,000
2018-05-08$62.98$77.11820,000
2018-05-07$62.43$76.44742,900
2018-05-04$62.41$76.41553,200
2018-05-03$61.71$75.55878,700
2018-05-02$62.81$76.90820,100
2018-05-01$63.11$77.27912,800
2018-04-30$63.23$77.421,485,800
2018-04-27$63.46$77.701,029,300
2018-04-26$63.35$77.562,472,200
2018-04-25$68.46$83.821,020,600
2018-04-24$69.49$85.081,058,100
2018-04-23$70.08$85.80553,300
2018-04-20$70.29$86.06534,300
2018-04-19$70.88$86.78445,400
2018-04-18$70.56$86.39576,600
2018-04-17$70.94$86.86702,600
2018-04-16$70.80$86.68651,800
2018-04-13$69.56$85.171,296,700
2018-04-12$70.40$86.191,027,300
2018-04-11$71.27$87.26631,400
2018-04-10$72.04$88.201,050,700
2018-04-09$72.04$88.20735,500
2018-04-06$72.78$89.11519,700
2018-04-05$74.63$91.37664,900
2018-04-04$74.88$91.68444,800
2018-04-03$74.53$91.25679,000
2018-04-02$73.31$89.76558,300
2018-03-29$74.91$91.72608,600
2018-03-28$72.96$89.33499,000
2018-03-27$73.39$89.86564,000
2018-03-26$75.12$91.97763,800
2018-03-23$72.61$88.90638,200
2018-03-22$74.99$91.811,027,000
2018-03-21$77.70$95.13547,100
2018-03-20$77.11$94.41462,200
2018-03-19$76.39$93.53671,600
2018-03-16$76.62$93.811,339,200
2018-03-15$75.53$92.48478,700
2018-03-14$75.92$92.95491,400
2018-03-13$76.59$93.77597,200
2018-03-12$77.33$94.68608,200
2018-03-09$76.97$94.24603,300
2018-03-08$75.36$92.27505,300
2018-03-07$74.91$91.72647,400
2018-03-06$74.76$91.53761,800
2018-03-05$73.29$89.731,066,300
2018-03-02$73.38$89.84688,800
2018-03-01$72.14$88.32578,100
2018-02-28$72.83$89.17750,500
2018-02-27$73.36$89.82661,500
2018-02-26$74.19$90.83856,300
2018-02-23$73.49$89.981,071,900
2018-02-22$73.59$90.10632,700
2018-02-21$73.95$90.54918,900
2018-02-20$72.73$89.05574,800
2018-02-16$73.76$90.31643,400
2018-02-15$73.42$89.89556,100
2018-02-14$72.98$89.35577,000
2018-02-13$71.35$87.36528,900
2018-02-12$71.16$87.13743,500
2018-02-09$70.37$86.161,173,800
2018-02-08$68.82$84.261,265,200
2018-02-07$72.49$88.75826,600
2018-02-06$71.45$87.481,350,500
2018-02-05$71.36$87.371,508,500
2018-02-02$74.26$90.92916,000
2018-02-01$75.40$92.321,323,600
2018-01-31$75.15$92.011,116,300
2018-01-30$75.26$92.14466,100
2018-01-29$76.47$93.63383,700
2018-01-26$77.29$94.63313,300
2018-01-25$76.75$93.97615,300
2018-01-24$76.57$93.75466,600
2018-01-23$76.67$93.87420,100
2018-01-22$77.17$94.48467,100
2018-01-19$77.23$94.56413,800
2018-01-18$76.52$93.69358,200
2018-01-17$76.69$93.90308,300
2018-01-16$75.96$93.00368,900
2018-01-12$76.65$93.85385,600
2018-01-11$75.58$92.54532,600
2018-01-10$75.00$91.83555,100
2018-01-09$75.30$92.19689,000
2018-01-08$74.14$90.77559,800
2018-01-05$73.59$90.10372,600
2018-01-04$73.06$89.45630,400
2018-01-03$72.06$88.23669,100
2018-01-02$71.84$87.96823,800