SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionSepio Capital, LP
Latest Disclosed Ownership29,599 shares
Latest Disclosed Value $ 2,322,623
Sepio Capital, LP reports 10.43% decrease in ownership of SEIC / SEI Investments Company

On May 13, 2026 - Sepio Capital, LP filed a 13F-HR form disclosing ownership of 29,599 shares of SEI Investments Company (MX:SEIC) valued at $2,322,623 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 33,047 shares of SEI Investments Company. This represents a change in shares of -10.43% 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)
2026-05-13 2026-03-31 13F SEI INVTS COM 784117103 29,599 -3,448 -10.43 2,323 -14.32 0.1261
2026-02-12 2025-12-31 13F SEI INVTS COM 784117103 33,047 -596 -1.77 2,711 -5.05 0.1483
2025-11-13 2025-09-30 13F SEI INVTS COM 784117103 33,643 -355 -1.04 2,855 -6.58 0.1689
2025-08-13 2025-06-30 13F SEI INVTS COM 784117103 33,998 -3,143 -8.46 3,055 5.97 0.2174
2025-05-15 2025-03-31 13F SEI INVTS COM 784117103 37,141 -776 -2.05 2,883 -7.80 0.2283
2025-02-13 2024-12-31 13F SEI INVTS COM 784117103 37,917 -1,725 -4.35 3,127 14.04 0.2503
2024-11-14 2024-09-30 13F SEI INVTS COM 784117103 39,642 -245 -0.61 2,743 6.28 0.2135
2024-08-15 2024-06-30 13F SEI INVTS COM 784117103 39,887 -362 -0.90 2,580 -10.82 0.2365
2024-05-15 2024-03-31 13F SEI INVTS COM 784117103 40,249 -1,834 -4.36 2,894 8.19 0.2482
2024-02-09 2023-12-31 13F SEI INVTS COM 784117103 42,083 -6,196 -12.83 2,674 -8.02 0.2247
2023-11-08 2023-09-30 13F SEI INVTS COM 784117103 48,279 342 0.71 2,908 1.75 0.2511
2023-08-08 2023-06-30 13F SEI INVTS COM 784117103 47,937 -1,731 -3.49 2,858 -0.03 0.2320
2023-05-10 2023-03-31 13F SEI INVTS COM 784117103 49,668 -5,316 -9.67 2,858 -10.83 0.2636
2023-02-03 2022-12-31 13F SEI INVTS COM 784117103 54,984 -5,372 -8.90 3,206 8.28 0.2770
2022-10-28 2022-09-30 13F SEI INVTS COM 784117103 60,356 -1,919 -3.08 2,960 -12.01 0.2938
2022-07-26 2022-06-30 13F SEI INVTS COM 784117103 62,275 -3,100 -4.74 3,364 -14.53 0.3379
2022-05-09 2022-03-31 13F SEI INVTS COM 784117103 65,375 -8,129 -11.06 3,936 -12.12 0.3453
2022-01-25 2021-12-31 13F SEI INVTS COM 784117103 73,504 -2,396 -3.16 4,479 -0.49 0.3309
2021-11-03 2021-09-30 13F SEI INVTS COM 784117103 75,900 408 0.54 4,501 -3.78 0.3710
2021-07-29 2021-06-30 13F/A-1 SEI INVTS COM 784117103 75,492 3,309 4.58 4,678 6.37 0.3854
2021-07-26 2021-06-30 13F SEI INVTS COM 784117103 75,492 3,309 4,678 0.4033
2021-05-10 2021-03-31 13F SEI INVTS COM 784117103 72,183 -35 -0.05 4,398 5.98 0.4051
2021-02-10 2020-12-31 13F SEI INVTS COM 784117103 72,218 -1,624 -2.20 4,150 10.81 0.3582
2020-11-12 2020-09-30 13F SEI INVTS COM 784117103 73,842 -2,381 -3.12 3,745 -10.64 0.4067
2020-08-04 2020-06-30 13F SEI INVTS COM 784117103 76,223 5,990 8.53 4,191 28.72 0.4922
2020-04-29 2020-03-31 13F SEI INVESTMENTS COM 784117103 70,233 2,660 3.94 3,256 -26.42 0.4312
2020-02-06 2019-12-31 13F SEI INVESTMENTS COM 784117103 67,573 -6,858 -9.21 4,425 0.34 0.4186
2019-10-25 2019-09-30 13F SEI INVESTMENTS COM 784117103 74,431 1,448 1.98 4,410 7.72 0.4550
2019-08-08 2019-06-30 13F SEI INVESTMENTS COM 784117103 72,983 851 1.18 4,094 8.62 0.5528
2019-06-21 2019-03-31 13F/A-1 SEI INVESTMENTS COM 784117103 72,132 4,616 6.84 3,769 20.84 0.5086
2019-05-14 2019-03-31 13F SEI INVESTMENTS COM 784117103 72,132 4,616 3,769 0.5573
2019-02-13 2018-12-31 13F SEI INVESTMENTS COM 784117103 67,516 67,516 3,119 0.2267
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.