SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionBnp Paribas Arbitrage, Sa
Latest Disclosed Ownership40,217 shares
Latest Disclosed Value $ 3,155,828
Bnp Paribas Arbitrage, Sa reports 4.33% increase in ownership of SEIC / SEI Investments Company

On May 12, 2026 - Bnp Paribas Arbitrage, Sa filed a 13F-HR form disclosing ownership of 40,217 shares of SEI Investments Company (MX:SEIC) valued at $3,155,828 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 38,547 shares of SEI Investments Company. This represents a change in shares of 4.33% 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)
2026-05-12 2026-03-31 13F SEI Investments Equity 784117103 40,217 1,670 4.33 3,156 -0.19 0.0002
2026-02-10 2025-12-31 13F SEI Investments Equity 784117103 38,547 19,390 101.22 3,162 94.52 0.0014
2025-11-13 2025-09-30 13F SEI Investments Equity 784117103 19,157 4,463 30.37 1,625 23.11 0.0009
2025-08-14 2025-06-30 13F SEI Investments Equity 784117103 14,694 -72,168 -83.08 1,320 -80.42 0.0008
2025-05-14 2025-03-31 13F SEI Investments Equity 784117103 86,862 12,098 16.18 6,743 9.36 0.0040
2025-02-14 2024-12-31 13F SEI Investments Equity 784117103 74,764 -16,138 -17.75 6,167 -1.96 0.0035
2024-11-13 2024-09-30 13F SEI Investments Equity 784117103 90,902 45,241 99.08 6,290 112.97 0.0042
2024-08-13 2024-06-30 13F SEI Investments Equity 784117103 45,661 -1,628 -3.44 2,954 -13.15 0.0024
2024-05-01 2024-03-31 13F SEI Investments Equity 784117103 47,289 -20,850 -30.60 3,400 -21.48 0.0030
2024-02-14 2023-12-31 13F/A-2 SEI Investments Equity 784117103 68,139 -3,015 -4.24 4,330 1.05 0.0049
2024-02-07 2023-12-31 13F/A-1 SEI Investments Equity 784117103 68,139 -3,015 4,330 0.0006
2024-02-07 2023-12-31 13F SEI Investments Equity 784117103 68,139 4,330
2023-11-14 2023-09-30 13F SEI Investments Equity 784117103 71,154 13,651 23.74 4,286 25.00 0.0055
2023-08-09 2023-06-30 13F SEI Investments Equity 784117103 57,503 -16,124 -21.90 3,428 -19.09 0.0043
2023-05-12 2023-03-31 13F SEI INVESTMENTS EQUITY 784117103 73,627 8,446 12.96 4,237 11.50 0.0059
2023-02-14 2022-12-31 13F SEI Investments Equity 784117103 65,181 -7,355 -10.14 3,800 6.83 0.0058
2022-11-16 2022-09-30 13F/A-1 SEI Investments Equity 784117103 72,536 -3,791 -4.97 3,558 -13.73 0.0057
2022-11-15 2022-09-30 13F SEI Investments Equity 784117103 72,536 -3,791 3,558 0.0009
2022-08-12 2022-06-30 13F SEI Investments Equity 784117103 76,327 -11,455 -13.05 4,123 -21.99 0.0064
2022-05-18 2022-03-31 13F/A-1 SEI Investments Equity 784117103 87,782 -14,866 -14.48 5,285 -15.51 0.0071
2022-02-09 2021-12-31 13F SEI INVESTMENTS EQUITY 784117103 102,648 41,791 68.67 6,255 73.36 0.0089
2021-11-16 2021-09-30 13F/A-1 SEI INVESTMENTS EQUITY 784117103 60,857 -20,549 -25.24 3,609 -28.47 0.0051
2021-11-12 2021-09-30 13F SEI INVESTMENTS EQUITY 784117103 148,565 67,159 7,535 0.0000
2021-08-10 2021-06-30 13F SEI INVESTMENTS EQUITY 784117103 81,406 4,407 5.72 5,045 7.53 0.0067
2021-05-07 2021-03-31 13F SEI INVESTMENTS EQUITY 784117103 76,999 7,456 10.72 4,692 17.39 0.0069
2021-02-10 2020-12-31 13F SEI INVESTMENTS EQUITY 784117103 69,543 -79,022 -53.19 3,997 -46.97 0.0074
2020-10-30 2020-09-30 13F SEI INVESTMENTS EQUITY 784117103 148,565 38,299 34.73 7,535 24.30 0.0108
2020-08-06 2020-06-30 13F SEI INVESTMENTS EQUITY 784117103 110,266 -173,912 -61.20 6,062 -53.96 0.0107
2020-05-13 2020-03-31 13F SEI INVESTMENTS EQUITY 784117103 284,178 892 0.31 13,169 -29.01 0.0270
2020-02-12 2019-12-31 13F SEI INVESTMENTS EQUITY 784117103 283,286 79,424 38.96 18,550 53.56 0.0338
2019-11-07 2019-09-30 13F SEI INVESTMENTS EQUITY 784117103 203,862 30,611 17.67 12,080 24.28 0.0214
2019-07-30 2019-06-30 13F SEI INVESTMENTS EQUITY 784117103 173,251 120,069 225.77 9,719 249.86 0.0194
2019-04-25 2019-03-31 13F SEI INVESTMENTS EQUITY 784117103 53,182 -158 -0.30 2,779 12.74 0.0060
2019-02-12 2018-12-31 13F SEI INVESTMENTS EQUITY 784117103 53,340 -5,412 -9.21 2,464 -31.35 0.0058
2018-11-07 2018-09-30 13F SEI INVESTMENTS EQUITY 784117103 58,752 -27,415 -31.82 3,590 -33.38 0.0053
2018-07-25 2018-06-30 13F SEI INVESTMENTS EQUITY 784117103 86,167 -32,923 -27.65 5,387 -39.61 0.0090
2018-05-11 2018-03-31 13F SEI INVESTMENTS EQUITY 784117103 119,090 23,255 24.27 8,921 29.55 0.0167
2018-03-05 2017-12-31 13F/A-1 SEI INVESTMENTS EQUITY 784117103 95,835 -175,321 -64.66 6,887 -58.41 0.0122
2018-02-01 2017-12-31 13F SEI INVESTMENTS EQUITY 784117103 95,835 -175,321 6,887
2017-11-03 2017-09-30 13F SEI INVESTMENTS STOCK 784117103 271,156 202,297 293.78 16,557 347.10 0.0405
2017-08-03 2017-06-30 13F SEI INVESTMENTS STOCK 784117103 68,859 17,881 35.08 3,703 44.03 0.0112
2017-05-03 2017-03-31 13F SEI INVESTMENTS STOCK 784117103 50,978 -2,617 -4.88 2,571 -2.80 0.0068
2017-02-14 2016-12-31 13F SEI INVESTMENTS STOCK 784117103 53,595 25,888 93.43 2,645 109.42 0.0124
2016-10-05 2016-09-30 13F * SEI INVESTMENTS CO COM STOCK 784117103 27,707 -42,426 -60.49 1,264 -62.57 0.0052
2016-07-06 2016-06-30 13F * SEI INVESTMENTS CO COM STOCK 784117103 70,133 -3,168 -4.32 3,374 6.94 0.0152
2016-04-22 2016-03-31 13F * SEI INVESTMENTS CO COM STOCK 784117103 73,301 60,718 482.54 3,156 378.76 0.0133
2016-04-19 2015-12-31 13F/A-1 * SEI INVESTMENTS CO COM STOCK 784117103 12,583 -12,444 -49.72 659 -45.40 0.0032
2016-02-10 2015-12-31 13F * SEI INVESTMENTS CO COM STOCK 784117103 12,583 659
2015-11-13 2015-09-30 13F * SEI INVESTMENTS CO COM STOCK 784117103 25,027 -970 -3.73 1,207 -5.26 0.0030
2015-08-14 2015-06-30 13F SEI INVESTMENTS CO COM STOCK 784117103 25,997 407 1.59 1,275 12.94 0.0036
2015-05-15 2015-03-31 13F * SEI INVESTMENTS CO COM STOCK 784117103 25,590 5,841 29.58 1,128 42.78 0.0031
2015-03-10 2014-12-31 13F/A-1 * SEI INVESTMENTS CO COM STOCK 784117103 19,749 12,415 169.28 791 198.11 0.0028
2015-02-11 2014-12-31 13F * SEI INVESTMENTS CO COM STOCK 784117103 19,749 791
2014-11-12 2014-09-30 13F * SEI INVESTMENTS CO COM STOCK 784117103 7,334 3,024 70.16 265 87.94 0.0002
2014-08-14 2014-06-30 13F/A-1 * SEI INVESTMENTS CO COM STOCK 784117103 4,310 -38,792 -90.00 141 -89.89 0.0001
2014-08-14 2014-06-30 13F SEI INVESTMENTS CO COM STOCK 784117103 4,310 141
2014-05-13 2014-03-31 13F SEI INVESTMENTS STOCK 784117103 43,102 -2,693 -5.88 1,396 -12.26 0.0011
2014-04-02 2013-12-31 13F/A-1 SEI INVESTMENTS STOCK 784117103 45,795 18,180 65.83 1,590 86.40 0.0012
2014-02-12 2013-12-31 13F SEI INVESTMENTS STOCK 784117103 45,795 1,590
2013-11-13 2013-09-30 13F SEI INVESTMENTS STOCK 784117103 27,615 -13,214 -32.36 854 -26.47 0.0006
2013-08-13 2013-06-30 13F SEI INVESTMENTS STOCK 784117103 40,829 40,829 1,161 0.0008
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.