SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionFirst Trust Advisors Lp
Latest Disclosed Ownership1,822,669 shares
Latest Disclosed Value $ 143,024,791
First Trust Advisors Lp reports 1.21% increase in ownership of SEIC / SEI Investments Company

On May 13, 2026 - First Trust Advisors Lp filed a 13F-HR form disclosing ownership of 1,822,669 shares of SEI Investments Company (MX:SEIC) valued at $143,024,791 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,800,938 shares of SEI Investments Company. This represents a change in shares of 1.21% 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.

Upgrade to unlock premium data and export to Excel .

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 1,822,669 21,731 1.21 143,025 -3.17 0.1019
2026-02-13 2025-12-31 13F SEI INVTS COM 784117103 1,800,938 75,919 4.40 147,713 0.92 0.1074
2025-11-12 2025-09-30 13F SEI INVTS COM 784117103 1,725,019 -2,315 -0.13 146,368 -5.70 0.1088
2025-08-13 2025-06-30 13F SEI INVTS COM 784117103 1,727,334 144,789 9.15 155,218 26.35 0.1248
2025-05-14 2025-03-31 13F SEI INVTS COM 784117103 1,582,545 1,099,970 227.94 122,853 208.66 0.1088
2025-02-13 2024-12-31 13F SEI INVTS COM 784117103 482,575 -468,603 -49.27 39,803 -39.52 0.0351
2024-11-13 2024-09-30 13F SEI INVTS COM 784117103 951,178 54,462 6.07 65,812 13.45 0.0627
2024-08-13 2024-06-30 13F SEI INVTS COM 784117103 896,716 -156,649 -14.87 58,009 -23.41 0.0591
2024-05-13 2024-03-31 13F SEI INVTS COM 784117103 1,053,365 899,520 584.69 75,737 674.71 0.0769
2024-02-13 2023-12-31 13F SEI INVTS COM 784117103 153,845 8,222 5.65 9,777 11.47 0.0107
2023-11-13 2023-09-30 13F SEI INVTS COM 784117103 145,623 -63,936 -30.51 8,771 -29.80 0.0104
2023-08-14 2023-06-30 13F SEI INVTS COM 784117103 209,559 -167,928 -44.49 12,494 -42.49 0.0142
2023-05-15 2023-03-31 13F SEI INVTS COM 784117103 377,487 -41,325 -9.87 21,724 -11.03 0.0251
2023-02-09 2022-12-31 13F SEI INVTS COM 784117103 418,812 12,021 2.96 24,417 22.37 0.0290
2022-11-14 2022-09-30 13F SEI INVTS COM 784117103 406,791 46,770 12.99 19,953 2.59 0.0259
2022-08-12 2022-06-30 13F SEI INVTS COM 784117103 360,021 -1,058,148 -74.61 19,449 -77.22 0.0240
2022-05-13 2022-03-31 13F SEI INVTS COM 784117103 1,418,169 41,915 3.05 85,388 1.81 0.0873
2022-02-08 2021-12-31 13F SEI INVTS COM 784117103 1,376,254 1,042,033 311.78 83,869 323.17 0.0816
2021-11-15 2021-09-30 13F SEI INVTS COM 784117103 334,221 -4,762 -1.40 19,819 -5.66 0.0213
2021-10-12 2021-06-30 13F/A-1 SEI INVTS COM 784117103 338,983 70,968 26.48 21,007 28.64 0.0227
2021-08-16 2021-06-30 13F SEI INVTS COM 784117103 338,983 70,968 21,007 0.0217
2021-05-14 2021-03-31 13F SEI INVTS COM 784117103 268,015 103,291 62.71 16,330 72.49 0.0198
2021-02-02 2020-12-31 13F SEI INVTS COM 784117103 164,724 18,449 12.61 9,467 27.60 0.0125
2020-11-05 2020-09-30 13F SEI INVTS COM 784117103 146,275 33,008 29.14 7,419 19.14 0.0119
2020-07-22 2020-06-30 13F SEI INVTS COM 784117103 113,267 -68,589 -37.72 6,227 -26.11 0.0108
2020-05-06 2020-03-31 13F SEI INVESTMENTS COM 784117103 181,856 -29,142 -13.81 8,427 -39.01 0.0191
2020-02-03 2019-12-31 13F SEI INVESTMENTS COM 784117103 210,998 13,454 6.81 13,816 18.04 0.0236
2019-11-04 2019-09-30 13F SEI INVESTMENTS COM 784117103 197,544 86,661 78.16 11,705 88.15 0.0220
2019-07-30 2019-06-30 13F SEI INVESTMENTS COM 784117103 110,883 88,772 401.48 6,221 438.61 0.0117
2019-06-19 2019-03-31 13F/A-1 SEI INVESTMENTS COM 784117103 22,111 22,111 1,155 0.0023
2019-05-09 2019-03-31 13F SEI INVESTMENTS COM 784117103 22,111 22,111 1,155
2018-10-25 2018-09-30 13F SEI INVESTMENTS COM 784117103 0 -237,964 -100.00 0 -100.00
2018-08-02 2018-06-30 13F SEI INVESTMENTS COM 784117103 237,964 -47,864 -16.75 14,878 -30.51 0.0309
2018-04-23 2018-03-31 13F SEI INVESTMENTS COM 784117103 285,828 -22,688 -7.35 21,411 -3.42 0.0492
2018-02-08 2017-12-31 13F SEI INVESTMENTS COM 784117103 308,516 244,567 382.44 22,170 467.73 0.0528
2017-10-24 2017-09-30 13F SEI INVESTMENTS COM 784117103 63,949 15,101 30.91 3,905 48.65 0.0100
2017-08-02 2017-06-30 13F SEI INVESTMENTS COM 784117103 48,848 34,707 245.44 2,627 268.44 0.0070
2017-05-02 2017-03-31 13F SEI INVESTMENTS COM 784117103 14,141 14,141 713 0.0020
2017-02-06 2016-12-31 13F SEI INVESTMENTS COM 784117103 0 -79,693 -100.00 0 -100.00
2016-11-01 2016-09-30 13F SEI INVESTMENTS COM 784117103 79,693 49,155 160.96 3,635 147.45 0.0109
2016-08-04 2016-06-30 13F SEI INVESTMENTS COM 784117103 30,538 -158,030 -83.81 1,469 -81.90 0.0046
2016-05-10 2016-03-31 13F SEI INVESTMENTS COM 784117103 188,568 -93,750 -33.21 8,118 -45.12 0.0261
2016-05-04 2015-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 282,318 -40,843 -12.64 14,793 -5.09 0.0384
2016-02-03 2015-12-31 13F SEI INVESTMENTS COM 784117103 282,318 14,793
2015-11-05 2015-09-30 13F SEI INVESTMENTS COM 784117103 323,161 4,521 1.42 15,586 -0.24 0.0452
2015-08-04 2015-06-30 13F SEI INVESTMENTS COM 784117103 318,640 96,161 43.22 15,623 59.27 0.0405
2015-05-04 2015-03-31 13F SEI INVESTMENTS COM 784117103 222,479 -150,704 -40.38 9,809 -34.35 0.0288
2015-02-13 2014-12-31 13F SEI INVESTMENTS COM 784117103 373,183 188,117 101.65 14,942 123.28 0.0504
2014-11-12 2014-09-30 13F SEI INVESTMENTS COM 784117103 185,066 30,674 19.87 6,692 32.28 0.0263
2014-08-11 2014-06-30 13F SEI INVESTMENTS COM 784117103 154,392 -73,614 -32.29 5,059 -33.98 0.0210
2014-05-12 2014-03-31 13F SEI INVESTMENTS COM 784117103 228,006 55,911 32.49 7,663 28.21 0.0337
2014-08-08 2013-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 172,095 59,571 52.94 5,977 71.85 0.0290
2014-02-13 2013-12-31 13F SEI INVESTMENTS COM 784117103 172,095 5,977
2013-11-12 2013-09-30 13F SEI INVESTMENTS COM 784117103 112,524 -67,736 -37.58 3,478 -32.14 0.0189
2013-08-12 2013-06-30 13F SEI INVESTMENTS COM 784117103 180,260 180,260 5,125 0.0333
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.