SEI Investments Company
US ˙ NasdaqGS ˙ US7841171033

SecuritySEIC / SEI Investments Company
InstitutionFmr Llc
Latest Disclosed Ownership2,092,499 shares
Latest Disclosed Value $ 164,198,460
Fmr Llc reports 55.79% increase in ownership of SEIC / SEI Investments Company

On May 15, 2026 - Fmr Llc filed a 13F-HR form disclosing ownership of 2,092,499 shares of SEI Investments Company (US:SEIC) valued at $164,198,397 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 1,343,174 shares of SEI Investments Company. This represents a change in shares of 55.79% during the quarter. The current value of the position is $182,068,338 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F SEI INVTS COM 784117103 2,092,499 749,325 55.79 164,198 49.04 0.0017
2026-02-17 2025-12-31 13F SEI INVTS COM 784117103 1,343,174 -6,456 -0.48 110,167 -3.80 0.0056
2025-11-13 2025-09-30 13F SEI INVTS COM 784117103 1,349,630 511,552 61.04 114,516 52.06 0.0060
2025-08-14 2025-06-30 13F SEI INVTS COM 784117103 838,078 -76,163 -8.33 75,310 6.11 0.0042
2025-05-12 2025-03-31 13F SEI INVTS COM 784117103 914,241 -318,984 -25.87 70,972 -30.23 0.0045
2025-02-13 2024-12-31 13F SEI INVTS COM 784117103 1,233,225 348,112 39.33 101,716 66.09 0.0061
2024-11-13 2024-09-30 13F SEI INVTS COM 784117103 885,113 632,024 249.72 61,241 274.05 0.0037
2024-08-13 2024-06-30 13F SEI INVTS COM 784117103 253,089 27,961 12.42 16,372 1.15 0.0010
2024-05-13 2024-03-31 13F SEI INVTS COM 784117103 225,128 35,857 18.94 16,187 34.57 0.0011
2024-02-13 2023-12-31 13F SEI INVTS COM 784117103 189,271 -171,461 -47.53 12,028 -44.64 0.0009
2023-11-13 2023-09-30 13F SEI INVTS COM 784117103 360,732 109,962 43.85 21,727 45.32 0.0019
2023-08-11 2023-06-30 13F SEI INVTS COM 784117103 250,770 37,365 17.51 14,951 21.73 0.0013
2023-08-11 2023-03-31 13F/A-1 SEI INVTS COM 784117103 213,405 -8,070 -3.64 12,281 -4.88 0.0011
2023-05-11 2023-03-31 13F SEI INVTS COM 784117103 213,405 -8,070 12,281 0.0011
2023-02-13 2022-12-31 13F SEI INVTS COM 784117103 221,475 19,717 9.77 12,912 30.45 0.0013
2022-11-10 2022-09-30 13F SEI INVTS COM 784117103 201,758 -34,365 -14.55 9,897 -22.41 0.0010
2022-08-12 2022-06-30 13F SEI INVTS COM 784117103 236,123 30,642 14.91 12,755 3.10 0.0013
2022-05-13 2022-03-31 13F SEI INVTS COM 784117103 205,481 3,215 1.59 12,372 0.37 0.0010
2022-02-14 2021-12-31 13F SEI INVTS COM 784117103 202,266 17,870 9.69 12,326 12.72 0.0009
2022-02-14 2021-09-30 13F/A-1 SEI INVTS COM 784117103 184,396 -60,878 -24.82 10,935 -28.06 0.0009
2021-11-15 2021-09-30 13F SEI INVTS COM 784117103 184,396 -60,878 10,935 0.0002
2021-08-13 2021-06-30 13F SEI INVTS COM 784117103 245,274 13,758 5.94 15,200 7.76 0.0012
2021-05-14 2021-03-31 13F SEI INVTS COM 784117103 231,516 35,865 18.33 14,106 25.45 0.0012
2021-02-08 2020-12-31 13F SEI INVTS COM 784117103 195,651 41,428 26.86 11,244 43.73 0.0010
2020-11-13 2020-09-30 13F SEI INVTS COM 784117103 154,223 -117,730 -43.29 7,823 -47.68 0.0008
2020-08-24 2020-06-30 13F/A-1 SEI INVTS COM 784117103 271,953 -1,553 -0.57 14,952 17.97 0.0016
2020-08-13 2020-06-30 13F SEI INVTS COM 784117103 271,953 -1,553 14,952 367.3269
2020-05-14 2020-03-31 13F SEI INVESTMENTS COM 784117103 273,506 -230,018 -45.68 12,674 -61.56 0.0018
2020-02-07 2019-12-31 13F SEI INVESTMENTS COM 784117103 503,524 54,840 12.22 32,971 24.01 0.0036
2019-11-13 2019-09-30 13F SEI INVESTMENTS COM 784117103 448,684 3,684 0.83 26,587 6.50 0.0032
2019-08-13 2019-06-30 13F SEI INVESTMENTS COM 784117103 445,000 233,903 110.80 24,965 126.34 0.0029
2019-05-13 2019-03-31 13F SEI INVESTMENTS COM 784117103 211,097 35,067 19.92 11,030 35.62 0.0013
2019-02-13 2018-12-31 13F SEI INVESTMENTS COM 784117103 176,030 -12,576 -6.67 8,133 -29.43 0.0011
2018-11-09 2018-09-30 13F SEI INVESTMENTS COM 784117103 188,606 -18,257 -8.83 11,524 -10.90 0.0013
2018-08-10 2018-06-30 13F SEI INVESTMENTS COM 784117103 206,863 11,055 5.65 12,934 -11.82 0.0015
2018-05-14 2018-03-31 13F SEI INVESTMENTS COM 784117103 195,808 7,868 4.19 14,668 8.60 0.0017
2018-02-12 2017-12-31 13F SEI INVESTMENTS COM 784117103 187,940 6,022 3.31 13,506 21.59 0.0016
2017-11-13 2017-09-30 13F SEI INVESTMENTS COM 784117103 181,918 15,326 9.20 11,108 23.97 0.0013
2017-08-29 2017-06-30 13F/A-1 SEI INVESTMENTS COM 784117103 166,592 -78,502 -32.03 8,960 -27.52 0.0011
2017-08-11 2017-06-30 13F SEI INVESTMENTS COM 784117103 166,592 -78,502 8,960
2017-05-11 2017-03-31 13F SEI INVESTMENTS COM 784117103 245,094 4,244 1.76 12,362 3.98 0.0016
2017-02-10 2016-12-31 13F SEI INVESTMENTS COM 784117103 240,850 45,074 23.02 11,889 33.15 0.0016
2016-11-14 2016-09-30 13F SEI INVESTMENTS COM 784117103 195,776 -23,234 -10.61 8,929 -15.26 0.0012
2016-08-11 2016-06-30 13F SEI INVESTMENTS COM 784117103 219,010 91,269 71.45 10,537 91.62 0.0014
2016-05-16 2016-03-31 13F SEI INVESTMENTS COM 784117103 127,741 -239,002 -65.17 5,499 -71.38 0.0008
2016-02-12 2015-12-31 13F SEI INVESTMENTS COM 784117103 366,743 241,646 193.17 19,217 218.53 0.0026
2015-11-10 2015-09-30 13F SEI INVESTMENTS COM 784117103 125,097 -162,138 -56.45 6,033 -57.16 0.0009
2015-08-25 2015-06-30 13F/A-1 SEI INVESTMENTS COM 784117103 287,235 -23,114 -7.45 14,083 2.92 0.0018
2015-08-13 2015-06-30 13F SEI INVESTMENTS COM 784117103 287,235 14,083
2015-05-14 2015-03-31 13F SEI INVESTMENTS COM 784117103 310,349 50,522 19.44 13,683 31.53 0.0017
2015-02-17 2014-12-31 13F SEI INVESTMENTS COM 784117103 259,827 9,959 3.99 10,403 15.14 0.0014
2014-11-14 2014-09-30 13F SEI INVESTMENTS COM 784117103 249,868 -336,144 -57.36 9,035 -52.95 0.0012
2014-08-14 2014-06-30 13F SEI INVESTMENTS COM 784117103 586,012 16,651 2.92 19,203 0.35 0.0026
2014-05-15 2014-03-31 13F SEI INVESTMENTS COM 784117103 569,361 -1,911,509 -77.05 19,136 -77.79 0.0027
2014-02-13 2013-12-31 13F SEI INVESTMENTS COM 784117103 2,480,870 -41,652 -1.65 86,161 10.50 0.0122
2013-11-14 2013-09-30 13F SEI INVESTMENTS COM 784117103 2,522,522 -1,925,821 -43.29 77,971 -38.35 0.0119
2013-09-24 2013-06-30 13F/A-1 SEI INVESTMENTS COM 784117103 4,448,343 4,448,343 126,466 0.0207
2013-08-14 2013-06-30 13F SEI INVESTMENTS COM 784117103 4,448,343 126,466 0.0207
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.