SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionLegal & General Group Plc
Latest Disclosed Ownership188,572 shares
Latest Disclosed Value $ 14,797,247
Legal & General Group Plc reports 0.88% decrease in ownership of SEIC / SEI Investments Company

On May 8, 2026 - Legal & General Group Plc filed a 13F-HR form disclosing ownership of 188,572 shares of SEI Investments Company (MX:SEIC) valued at $14,797,247 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 190,243 shares of SEI Investments Company. This represents a change in shares of -0.88% during the quarter.

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)
2026-05-08 2026-03-31 13F SEI INVTS COM 784117103 188,572 -1,671 -0.88 14,797 -5.17 0.0034
2026-02-09 2025-12-31 13F SEI INVTS COM 784117103 190,243 -39,742 -17.28 15,604 -20.04 0.0035
2025-11-13 2025-09-30 13F SEI INVTS COM 784117103 229,985 -11,546 -4.78 19,514 -10.09 0.0044
2025-08-12 2025-06-30 13F SEI INVTS COM 784117103 241,531 -160,739 -39.96 21,704 -30.50 0.0054
2025-05-15 2025-03-31 13F SEI INVTS COM 784117103 402,270 2,200 0.55 31,228 -5.36 0.0085
2025-02-13 2024-12-31 13F SEI INVTS COM 784117103 400,070 15,353 3.99 32,998 23.96 0.0087
2025-02-28 2024-09-30 13F/A-2 SEI INVTS COM 784117103 384,717 -491,162 -56.08 26,619 -53.02 0.0070
2024-11-14 2024-09-30 13F/A-1 SEI INVTS COM 784117103 517,579 -494,807 35,811 0.0075
2024-11-14 2024-09-30 13F SEI INVTS COM 784117103 517,579 -494,807 35,811 0.0038
2025-05-29 2024-06-30 13F/A-1 SEI INVTS COM 784117103 875,879 -16,912 -1.89 56,661 -11.73 0.0160
2024-08-14 2024-06-30 13F SEI INVTS COM 784117103 1,012,386 -13,201 65,491 0.0147
2025-05-29 2024-03-31 13F/A-2 SEI INVTS COM 784117103 892,791 8,473 0.96 64,192 14.22 0.0185
2024-07-01 2024-03-31 13F/A-1 SEI INVTS COM 784117103 1,025,587 1,038 73,740 0.0172
2024-05-14 2024-03-31 13F SEI INVTS COM 784117103 1,024,699 150 73,676 0.0089
2025-05-29 2023-12-31 13F/A-1 SEI INVTS COM 784117103 884,318 -68,046 -7.14 56,198 -2.03 0.0175
2024-02-15 2023-12-31 13F SEI INVTS COM 784117103 1,024,549 72,185 65,110 0.0167
2023-11-14 2023-09-30 13F SEI INVTS COM 784117103 952,364 -12,141 -1.26 57,361 -0.25 0.0200
2023-08-14 2023-06-30 13F SEI INVTS COM 784117103 964,505 8,220 0.86 57,504 4.49 0.0187
2023-05-15 2023-03-31 13F SEI INVTS COM 784117103 956,285 101,332 11.85 55,034 10.41 0.0197
2023-02-14 2022-12-31 13F SEI INVTS COM 784117103 854,953 -10,831 -1.25 49,844 17.37 0.0191
2022-11-14 2022-09-30 13F SEI INVTS COM 784117103 865,784 -34,198 -3.80 42,467 -12.65 0.0166
2022-08-22 2022-06-30 13F SEI INVTS COM 784117103 899,982 -36,108 -3.86 48,617 -13.74 0.0172
2022-05-16 2022-03-31 13F SEI INVTS COM 784117103 936,090 61,406 7.02 56,362 5.74 0.0171
2022-02-14 2021-12-31 13F SEI INVTS COM 784117103 874,684 -13,783 -1.55 53,304 1.17 0.0161
2021-11-15 2021-09-30 13F SEI INVTS COM 784117103 888,467 -9,869 -1.10 52,686 -5.36 0.0171
2021-08-12 2021-06-30 13F SEI INVTS COM 784117103 898,336 -8,099 -0.89 55,670 0.80 0.0186
2021-05-17 2021-03-31 13F SEI INVTS COM 784117103 906,435 7,675 0.85 55,229 6.93 0.0206
2021-02-12 2020-12-31 13F SEI INVTS COM 784117103 898,760 -33,796 -3.62 51,651 9.20 0.0202
2020-11-13 2020-09-30 13F SEI INVTS COM 784117103 932,556 -30,040 -3.12 47,299 -10.63 0.0211
2020-08-14 2020-06-30 13F SEI INVTS COM 784117103 962,596 14,849 1.57 52,924 20.46 0.0256
2020-05-14 2020-03-31 13F SEI INVESTMENTS COM 784117103 947,747 6,011 0.64 43,935 -28.75 0.0257
2020-02-13 2019-12-31 13F SEI INVESTMENTS COM 784117103 941,736 68,352 7.83 61,664 25.85 0.0294
2019-08-14 2019-06-30 13F SEI INVESTMENTS COM 784117103 873,384 54,545 6.66 48,997 14.52 0.0264
2019-05-15 2019-03-31 13F SEI INVESTMENTS COM 784117103 818,839 125,727 18.14 42,785 33.61 0.0244
2019-02-15 2018-12-31 13F SEI INVESTMENTS COM 784117103 693,112 46,767 7.24 32,022 -18.92 0.0248
2018-11-20 2018-09-30 13F SEI INVESTMENTS COM 784117103 646,345 3,277 0.51 39,492 -1.77 0.0283
2018-08-10 2018-06-30 13F SEI INVESTMENTS COM 784117103 643,068 -51,432 -7.41 40,204 -22.72 0.0310
2018-05-17 2018-03-31 13F SEI INVESTMENTS COM 784117103 694,500 18,721 2.77 52,025 7.13 0.0397
2018-02-13 2017-12-31 13F SEI INVESTMENTS COM 784117103 675,779 8,255 1.24 48,561 19.14 0.0351
2017-11-09 2017-09-30 13F SEI INVESTMENTS COM 784117103 667,524 35,067 5.54 40,759 19.83 0.0307
2017-08-03 2017-06-30 13F SEI INVESTMENTS COM 784117103 632,457 55,542 9.63 34,014 16.89 0.0275
2017-05-12 2017-03-31 13F SEI INVESTMENTS COM 784117103 576,915 51,823 9.87 29,099 12.27 0.0247
2017-02-13 2016-12-31 13F SEI INVESTMENTS COM 784117103 525,092 6,252 1.20 25,918 9.52 0.0242
2016-10-12 2016-09-30 13F SEI INVESTMENTS COM 784117103 518,840 -25,835 -4.74 23,665 -9.69 0.0240
2016-08-16 2016-06-30 13F SEI INVESTMENTS COM 784117103 544,675 1,337 0.25 26,204 12.03 0.0276
2016-05-16 2016-03-31 13F SEI INVESTMENTS COM 784117103 543,338 -28,214 -4.94 23,391 -21.90 0.0259
2016-02-16 2015-12-31 13F SEI INVESTMENTS COM 784117103 571,552 31,415 5.82 29,949 14.96 0.0338
2015-11-13 2015-09-30 13F SEI INVESTMENTS COM 784117103 540,137 27,674 5.40 26,051 3.68 0.0318
2015-07-31 2015-06-30 13F SEI INVESTMENTS COM 784117103 512,463 -2,942 -0.57 25,126 10.57 0.0295
2015-05-14 2015-03-31 13F SEI INVESTMENTS COM 784117103 515,405 -12,851 -2.43 22,724 7.43 0.0272
2015-02-20 2014-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 528,256 -9,364 -1.74 21,152 8.80 0.0249
2015-02-17 2014-12-31 13F SEI INVESTMENTS COM 784117103 528,256 -9,364 21,152 0.0261
2014-11-14 2014-09-30 13F SEI INVESTMENTS COM 784117103 537,620 -8,323 -1.52 19,441 8.66 0.0233
2014-08-13 2014-06-30 13F SEI INVESTMENTS COM 784117103 545,943 -1,802 -0.33 17,891 -2.82 0.0208
2014-05-14 2014-03-31 13F SEI INVESTMENTS COM 784117103 547,745 676 0.12 18,410 -3.11 0.0224
2014-02-07 2013-12-31 13F SEI INVESTMENTS COM 784117103 547,069 9,512 1.77 19,000 14.35 0.0230
2013-11-12 2013-09-30 13F SEI INVESTMENTS COM 784117103 537,557 3,902 0.73 16,616 9.52 0.0219
2013-08-01 2013-06-30 13F SEI INVESTMENTS COM 784117103 533,655 533,655 15,172 0.0210
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.