SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionAPG Asset Management N.V.
Latest Disclosed Ownership54,829 shares
Latest Disclosed Value $ 3,734,101
APG Asset Management N.V. reports 6.79% decrease in ownership of SEIC / SEI Investments Company

On May 13, 2026 - APG Asset Management N.V. filed a 13F-HR form disclosing ownership of 54,829 shares of SEI Investments Company (MX:SEIC) valued at $3,734,101 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 58,821 shares of SEI Investments Company. This represents a change in shares of -6.79% 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 54,829 -3,992 -6.79 3,734 -9.08 0.0118
2026-02-12 2025-12-31 13F SEI INVTS COM 784117103 58,821 -3,779 -6.04 4,108 -9.14 0.0117
2025-11-12 2025-09-30 13F SEI INVTS COM 784117103 62,600 0 0.00 4,521 -5.68 0.0127
2025-08-12 2025-06-30 13F SEI INVTS COM 784117103 62,600 1,700 2.79 4,792 9.51 0.0142
2025-05-14 2025-03-31 13F SEI INVTS COM 784117103 60,900 -1,400 -2.25 4,377 -11.81 0.0136
2025-02-13 2024-12-31 13F SEI INVTS COM 784117103 62,300 62,300 4,962 0.0138
2024-11-14 2024-09-30 13F SEI INVTS COM 784117103 0 -27,061 -100.00 0 -100.00
2024-08-14 2024-06-30 13F SEI INVTS COM 784117103 27,061 -151,455 -84.84 1,633 -86.26 0.0029
2024-05-14 2024-03-31 13F SEI INVTS COM 784117103 178,516 13,900 8.44 11,885 25.49 0.0208
2024-02-13 2023-12-31 13F SEI INVTS COM 784117103 164,616 17,400 11.82 9,470 6.81 0.0185
2023-11-14 2023-09-30 13F SEI INVTS COM 784117103 147,216 125,400 574.81 8,867 643.79 0.0181
2023-08-14 2023-06-30 13F SEI INVTS COM 784117103 21,816 -36,400 -62.53 1,192 -61.34 0.0024
2023-05-12 2023-03-31 13F SEI INVTS COM 784117103 58,216 7,894 15.69 3,084 154,050.00 0.0065
2023-02-14 2022-12-31 13F SEI INVTS COM 784117103 50,322 50,322 3 0.0056
2022-11-14 2022-09-30 13F SEI INVTS COM 784117103 0 -17,516 -100.00 0 -100.00
2022-08-12 2022-06-30 13F SEI INVTS COM 784117103 17,516 -2,800 -13.78 905 -17.65 0.0021
2022-05-12 2022-03-31 13F SEI INVTS COM 784117103 20,316 -37,937 -65.12 1,099 -64.80 0.0021
2022-02-11 2021-12-31 13F SEI INVTS COM 784117103 58,253 -5,700 -8.91 3,122 -4.58 0.0053
2021-11-15 2021-09-30 13F/A-1 SEI INVTS COM 784117103 63,953 4,400 7.39 3,272 5.14 0.0058
2021-11-15 2021-09-30 13F SEI INVTS COM 784117103 63,953 4,400 3,272 0.0059
2021-08-13 2021-06-30 13F SEI INVTS COM 784117103 59,553 16,200 37.37 3,112 38.43 0.0053
2021-05-14 2021-03-31 13F SEI INVTS COM 784117103 43,353 -145,530 -77.05 2,248 -74.66 0.0038
2021-02-12 2020-12-31 13F SEI INVTS COM 784117103 188,883 -267,269 -58.59 8,872 -55.03 0.0145
2020-11-12 2020-09-30 13F SEI INVTS COM 784117103 456,152 133,204 41.25 19,730 24.80 0.0341
2020-08-14 2020-06-30 13F SEI INVTS COM 784117103 322,948 25,930 8.73 15,809 14.86 0.0288
2020-05-19 2020-03-31 13F/A-2 SEI INVESTMENTS COM 784117103 297,018 79,200 36.36 13,764 8.33 0.0270
2020-05-15 2020-03-31 13F/A-1 SEI INVESTMENTS COM 784117103 297,018 0 13,764 0.0273
2020-05-14 2020-03-31 13F SEI INVESTMENTS COM 784117103 37,590 -180,228 1,749 3,272.3133
2020-02-13 2019-12-31 13F SEI INVESTMENTS COM 784117103 217,818 106,100 94.97 12,706 109.26 0.0206
2019-11-08 2019-09-30 13F SEI INVESTMENTS COM 784117103 111,718 75,128 205.32 6,072 236.77 0.0100
2019-08-13 2019-06-30 13F SEI INVESTMENTS COM 784117103 36,590 -1,000 -2.66 1,803 3.09 0.0031
2019-05-14 2019-03-31 13F SEI INVESTMENTS COM 784117103 37,590 -204,000 -84.44 1,749 -82.09 0.0032
2019-02-19 2018-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 241,590 -231,600 -48.94 9,764 -60.77 0.0198
2019-02-13 2018-12-31 13F SEI INVESTMENTS COM 784117103 241,590 -231,600 9,764
2018-11-09 2018-09-30 13F SEI INVESTMENTS COM 784117103 473,190 87,600 22.72 24,892 20.55 0.0436
2018-08-13 2018-06-30 13F SEI INVESTMENTS COM 784117103 385,590 152,200 65.21 20,648 45.24 0.0380
2018-05-14 2018-03-31 13F SEI INVESTMENTS COM 784117103 233,390 81,300 53.46 14,216 56.19 0.0275
2018-02-21 2017-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 152,090 90,400 146.54 9,102 141.62 0.0167
2018-01-24 2017-12-31 13F SEI INVESTMENTS COM 784117103 152,090 90,400 9,102
2017-10-19 2017-09-30 13F SEI INVESTMENTS COM 784117103 61,690 27,800 82.03 3,767 106.64 0.0062
2017-07-21 2017-06-30 13F SEI INVESTMENTS COM 784117103 33,890 0 0.00 1,823 6.67 0.0033
2017-05-01 2017-03-31 13F SEI INVESTMENTS COM 784117103 33,890 -19,000 -35.92 1,709 -30.95 0.0031
2017-01-30 2016-12-31 13F SEI INVESTMENTS COM 784117103 52,890 -2,400 -4.34 2,475 -1.86 0.0047
2016-10-31 2016-09-30 13F SEI INVESTMENTS COM 784117103 55,290 -15,000 -21.34 2,522 -25.43 0.0044
2016-08-11 2016-06-30 13F SEI INVESTMENTS COM 784117103 70,290 30,300 75.77 3,382 96.40 0.0064
2016-05-16 2016-03-31 13F SEI INVESTMENTS COM 784117103 39,990 0 0.00 1,722 -17.80 0.0036
2016-02-17 2015-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 39,990 0 0.00 2,095 8.61 0.0048
2016-02-16 2015-12-31 13F SEI INVESTMENTS COM 784117103 291,333 2,095
2015-11-12 2015-09-30 13F SEI INVESTMENTS COM 784117103 39,990 0 0.00 1,929 -1.63 0.0044
2015-08-12 2015-06-30 13F SEI INVESTMENTS COM 784117103 39,990 0 0.00 1,961 11.23 0.0039
2015-05-14 2015-03-31 13F SEI INVESTMENTS COM 784117103 39,990 -56,130 -58.40 1,763 -54.20 0.0036
2015-02-09 2014-12-31 13F SEI INVESTMENTS COM 784117103 96,120 -39,004 -28.87 3,849 -21.22 0.0074
2014-11-12 2014-09-30 13F SEI INVESTMENTS COM 784117103 135,124 -3,463 -2.50 4,886 7.60 0.0099
2014-08-11 2014-06-30 13F SEI INVESTMENTS COM 784117103 138,587 10,171 7.92 4,541 5.21 0.0097
2014-04-30 2014-03-31 13F SEI INVESTMENTS COM 784117103 128,416 24,303 23.34 4,316 19.36 0.0113
2014-02-20 2013-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 104,113 -1,016 -0.97 3,616 11.26 0.0106
2014-02-12 2013-12-31 13F SEI INVESTMENTS COM 784117103 104,113 3,616
2013-11-13 2013-09-30 13F SEI INVESTMENTS COM 784117103 105,129 -23,948 -18.55 3,250 -11.44 0.0103
2013-08-14 2013-06-30 13F SEI INVESTMENTS COM 784117103 129,077 129,077 3,670 0.0115
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.