SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionProShare Advisors LLC
Latest Disclosed Ownership300,632 shares
Latest Disclosed Value $ 23,590,593
ProShare Advisors LLC reports 25.83% decrease in ownership of SEIC / SEI Investments Company

On April 24, 2026 - ProShare Advisors LLC filed a 13F-HR form disclosing ownership of 300,632 shares of SEI Investments Company (MX:SEIC) valued at $23,590,593 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 405,354 shares of SEI Investments Company. This represents a change in shares of -25.83% 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)
2026-04-24 2026-03-31 13F SEI INVTS COM 784117103 300,632 -104,722 -25.83 23,591 -29.05 0.0349
2026-02-06 2025-12-31 13F SEI INVTS COM 784117103 405,354 15,733 4.04 33,247 0.57 0.0587
2025-11-06 2025-09-30 13F SEI INVTS COM 784117103 389,621 -62,533 -13.83 33,059 -18.63 0.0692
2025-08-07 2025-06-30 13F SEI INVTS COM 784117103 452,154 90,474 25.01 40,631 44.71 0.0811
2025-05-08 2025-03-31 13F SEI INVTS COM 784117103 361,680 -89,674 -19.87 28,077 -24.58 0.0634
2025-02-14 2024-12-31 13F SEI INVTS COM 784117103 451,354 -32,755 -6.77 37,228 11.14 0.0851
2024-11-14 2024-09-30 13F SEI INVTS COM 784117103 484,109 19,098 4.11 33,496 11.35 0.0821
2024-08-13 2024-06-30 13F SEI INVTS COM 784117103 465,011 2,698 0.58 30,082 -9.50 0.0805
2024-05-08 2024-03-31 13F SEI INVTS COM 784117103 462,313 -80,798 -14.88 33,240 -3.69 0.0884
2024-02-14 2023-12-31 13F SEI INVTS COM 784117103 543,111 -3,594 -0.66 34,515 4.82 0.1055
2023-11-13 2023-09-30 13F SEI INVTS COM 784117103 546,705 -10,711 -1.92 32,928 -0.92 0.1027
2023-08-10 2023-06-30 13F SEI INVTS COM 784117103 557,416 5,906 1.07 33,233 4.71 0.0964
2023-05-26 2023-03-31 13F/A-1 SEI INVTS COM 784117103 551,510 -132,530 -19.37 31,739 -20.41 0.0970
2023-05-12 2023-03-31 13F SEI INVTS COM 784117103 551,510 -132,530 31,739 0.1009
2023-02-02 2022-12-31 13F SEI INVTS COM 784117103 684,040 193,691 39.50 39,880 65.81 0.1400
2022-11-07 2022-09-30 13F SEI INVTS COM 784117103 490,349 65,093 15.31 24,051 4.70 0.0923
2022-08-01 2022-06-30 13F SEI INVTS COM 784117103 425,256 26,043 6.52 22,972 -4.43 0.0762
2022-05-10 2022-03-31 13F SEI INVTS COM 784117103 399,213 56,138 16.36 24,036 14.97 0.0516
2022-02-08 2021-12-31 13F SEI INVTS COM 784117103 343,075 8,395 2.51 20,906 5.34 0.0410
2021-11-12 2021-09-30 13F SEI INVTS COM 784117103 334,680 -13,460 -3.87 19,847 -8.01 0.0558
2021-08-13 2021-06-30 13F SEI INVTS COM 784117103 348,140 59,427 20.58 21,574 22.64 0.0631
2021-05-14 2021-03-31 13F SEI INVTS COM 784117103 288,713 -19,351 -6.28 17,591 -0.64 0.0553
2021-02-09 2020-12-31 13F SEI INVTS COM 784117103 308,064 28,512 10.20 17,704 24.86 0.0659
2020-11-13 2020-09-30 13F SEI INVTS COM 784117103 279,552 14,501 5.47 14,179 -2.70 0.0655
2020-08-03 2020-06-30 13F SEI INVTS COM 784117103 265,051 28,246 11.93 14,573 32.80 0.0778
2020-05-15 2020-03-31 13F SEI INVESTMENTS COM 784117103 236,805 -45,331 -16.07 10,974 -40.60 0.0789
2020-02-12 2019-12-31 13F SEI INVESTMENTS COM 784117103 282,136 16,598 6.25 18,474 17.41 0.0855
2019-11-12 2019-09-30 13F SEI INVESTMENTS COM 784117103 265,538 16,332 6.55 15,734 12.55 0.0881
2019-08-13 2019-06-30 13F SEI INVESTMENTS COM 784117103 249,206 6,250 2.57 13,980 10.13 0.0836
2019-05-15 2019-03-31 13F SEI INVESTMENTS COM 784117103 242,956 49,528 25.61 12,694 42.05 0.0760
2019-02-14 2018-12-31 13F SEI INVESTMENTS COM 784117103 193,428 36,295 23.10 8,936 -6.93 0.0625
2018-11-14 2018-09-30 13F SEI INVESTMENTS COM 784117103 157,133 21,911 16.20 9,601 13.57 0.0652
2018-08-13 2018-06-30 13F SEI INVESTMENTS COM 784117103 135,222 920 0.69 8,454 -15.97 0.0567
2018-05-14 2018-03-31 13F SEI INVESTMENTS COM 784117103 134,302 -50,993 -27.52 10,061 -24.44 0.0655
2018-02-14 2017-12-31 13F SEI INVESTMENTS COM 784117103 185,295 -6,597 -3.44 13,315 13.64 0.0924
2017-11-13 2017-09-30 13F SEI INVESTMENTS COM 784117103 191,892 -20,114 -9.49 11,717 2.76 0.1077
2017-08-11 2017-06-30 13F SEI INVESTMENTS COM 784117103 212,006 4,162 2.00 11,402 8.76 0.1136
2017-05-12 2017-03-31 13F/A-2 SEI INVESTMENTS COM 784117103 207,844 36,980 21.64 10,484 24.31 0.1097
2017-05-08 2017-03-31 13F/A-1 SEI INVESTMENTS COM 784117103 207,844 0 10,484 0.1096
2017-04-25 2017-03-31 13F SEI INVESTMENTS COM 784117103 207,844 10,484
2017-02-13 2016-12-31 13F SEI INVESTMENTS COM 784117103 170,864 57,967 51.35 8,434 63.80 0.0934
2016-11-10 2016-09-30 13F SEI INVESTMENTS COM 784117103 112,897 39,954 54.77 5,149 46.74 0.0719
2016-08-12 2016-06-30 13F SEI INVESTMENTS COM 784117103 72,943 26,117 55.77 3,509 74.06 0.0452
2016-05-06 2016-03-31 13F SEI INVESTMENTS COM 784117103 46,826 4,137 9.69 2,016 -9.88 0.0278
2016-02-05 2015-12-31 13F SEI INVESTMENTS COM 784117103 42,689 4,670 12.28 2,237 21.97 0.0271
2015-11-06 2015-09-30 13F SEI INVESTMENTS COM 784117103 38,019 -2,586 -6.37 1,834 -7.89 0.0258
2015-08-11 2015-06-30 13F SEI INVESTMENTS COM 784117103 40,605 -2,155 -5.04 1,991 5.62 0.0276
2015-05-08 2015-03-31 13F SEI INVESTMENTS COM 784117103 42,760 42,760 0.00 1,885 0.0222
2015-01-30 2014-12-31 13F SEI INVESTMENTS COM 784117103 0 -89,800 -100.00 0 -100.00
2014-11-06 2014-09-30 13F SEI INVESTMENTS COM 784117103 89,800 -1,271 -1.40 3,247 8.81 0.0430
2014-08-08 2014-06-30 13F SEI INVESTMENTS COM 784117103 91,071 49,784 120.58 2,984 114.99 0.0387
2014-05-07 2014-03-31 13F SEI INVESTMENTS COM 784117103 41,287 -87,374 -67.91 1,388 -68.93 0.0174
2014-02-04 2013-12-31 13F SEI INVESTMENTS COM 784117103 128,661 89,283 226.73 4,468 267.13 0.0666
2013-11-07 2013-09-30 13F SEI INVESTMENTS COM 784117103 39,378 7,790 24.66 1,217 35.52 0.0289
2013-07-25 2013-06-30 13F SEI INVESTMENTS COM 784117103 31,588 31,588 898 0.0176
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.