SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionLafayette Investments, Inc.
Latest Disclosed Ownership15,221 shares
Latest Disclosed Value $ 1,194,392
Lafayette Investments, Inc. reports 0.33% decrease in ownership of SEIC / SEI Investments Company

On April 27, 2026 - Lafayette Investments, Inc. filed a 13F-HR form disclosing ownership of 15,221 shares of SEI Investments Company (MX:SEIC) valued at $1,194,392 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 4, 2026 disclosing 15,271 shares of SEI Investments Company. This represents a change in shares of -0.33% 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)
2026-04-27 2026-03-31 13F SEI INVTS COM 784117103 15,221 -50 -0.33 1,194 -4.63 0.2418
2026-02-04 2025-12-31 13F SEI INVTS COM 784117103 15,271 -3 -0.02 1,253 -3.32 0.2367
2025-11-06 2025-09-30 13F SEI INVTS COM 784117103 15,274 0 0.00 1,296 -5.61 0.2482
2025-07-30 2025-06-30 13F SEI INVTS COM 784117103 15,274 -145 -0.94 1,373 14.72 0.2774
2025-04-24 2025-03-31 13F SEI INVTS COM 784117103 15,419 -480 -3.02 1,197 -8.77 0.2532
2025-02-13 2024-12-31 13F SEI INVTS COM 784117103 15,899 -1,075 -6.33 1,311 11.67 0.2811
2025-02-13 2024-09-30 13F/A-1 SEI INVTS COM 784117103 16,974 -16 -0.09 1,174 6.82 0.2476
2024-10-22 2024-09-30 13F SEI INVTS COM 784117103 16,974 -16 1,174 0.2476
2024-07-31 2024-06-30 13F SEI INVTS COM 784117103 16,990 -662 -3.75 1,099 -13.40 0.2499
2024-05-09 2024-03-31 13F SEI INVTS COM 784117103 17,652 -235 -1.31 1,269 11.71 0.2851
2024-01-31 2023-12-31 13F SEI INVTS COM 784117103 17,887 -560 -3.04 1,137 2.25 0.2825
2023-10-27 2023-09-30 13F SEI INVTS COM 784117103 18,447 -100 -0.54 1,111 0.54 0.3028
2023-07-24 2023-06-30 13F SEI INVTS COM 784117103 18,547 -1,751 -8.63 1,106 -5.39 0.2905
2023-04-20 2023-03-31 13F SEI INVTS COM 784117103 20,298 -495 -2.38 1,168 -3.63 0.3234
2023-01-24 2022-12-31 13F SEI INVTS COM 784117103 20,793 718 3.58 1,212 23.05 0.3411
2022-10-28 2022-09-30 13F SEI INVTS COM 784117103 20,075 -2,286 -10.22 985 -18.46 0.3040
2022-07-27 2022-06-30 13F SEI INVTS COM 784117103 22,361 1,585 7.63 1,208 -3.44 0.3488
2022-05-11 2022-03-31 13F SEI INVTS COM 784117103 20,776 718 3.58 1,251 2.37 0.3106
2022-02-10 2021-12-31 13F SEI INVTS COM 784117103 20,058 609 3.13 1,222 5.98 0.3053
2021-11-12 2021-09-30 13F SEI INVTS COM 784117103 19,449 1,699 9.57 1,153 4.82 0.3129
2021-08-10 2021-06-30 13F SEI INVTS COM 784117103 17,750 494 2.86 1,100 4.66 0.2997
2021-05-12 2021-03-31 13F SEI INVTS COM 784117103 17,256 -3,198 -15.64 1,051 -10.55 0.3364
2021-02-11 2020-12-31 13F SEI INVTS COM 784117103 20,454 1,956 10.57 1,175 25.27 0.3993
2020-10-30 2020-09-30 13F SEI INVTS COM 784117103 18,498 629 3.52 938 -4.48 0.3586
2020-08-05 2020-06-30 13F SEI INVTS COM 784117103 17,869 0 0.00 982 18.60 0.4095
2020-05-07 2020-03-31 13F SEI INVESTMENTS COM 784117103 17,869 0 0.00 828 -29.23 0.3980
2020-02-05 2019-12-31 13F SEI INVESTMENTS COM 784117103 17,869 85 0.48 1,170 11.01 0.4065
2019-10-23 2019-09-30 13F SEI INVESTMENTS COM 784117103 17,784 2,617 17.25 1,054 23.85 0.3809
2019-08-12 2019-06-30 13F SEI INVESTMENTS COM 784117103 15,167 15,167 851 0.3015
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.