SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionWellington Shields & Co., LLC
Latest Disclosed Ownership6,500 shares
Latest Disclosed Value $ 510,055
Wellington Shields & Co., LLC ownership in SEIC / SEI Investments Company

On May 4, 2026 - Wellington Shields & Co., LLC filed a 13F-HR form disclosing ownership of 6,500 shares of SEI Investments Company (MX:SEIC) valued at $510,055 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 6,500 shares of SEI Investments Company. This represents a change in shares of 0.00% 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)
2026-05-04 2026-03-31 13F SEI INVTS CO COM Stock 784117103 6,500 0 0.00 510 -4.32 0.1300
2026-02-09 2025-12-31 13F SEI INVTS CO COM Stock 784117103 6,500 -500 -7.14 533 -10.12 0.1315
2025-11-05 2025-09-30 13F SEI INVTS CO COM Stock 784117103 7,000 0 0.00 594 -5.72 0.1549
2025-08-05 2025-06-30 13F SEI INVTS CO COM Stock 784117103 7,000 -1,000 -12.50 629 1.29 0.1781
2025-05-08 2025-03-31 13F SEI INVTS CO COM Stock 784117103 8,000 -1,000 -11.11 621 -16.31 0.1944
2025-02-10 2024-12-31 13F SEI INVTS CO COM Stock 784117103 9,000 0 0.00 742 19.29 0.2276
2024-11-13 2024-09-30 13F SEI INVTS CO COM Stock 784117103 9,000 0 0.00 623 6.87 0.1893
2024-08-07 2024-06-30 13F SEI INVTS CO COM Stock 784117103 9,000 0 0.00 582 -10.05 0.1896
2024-05-23 2024-03-31 13F/A-2 SEI INVTS CO COM Stock 784117103 9,000 0 0.00 647 13.31 0.2169
2024-05-23 2024-03-31 13F/A-1 SEI INVTS CO COM Stock 784117103 9,000 0 572 0.2110
2024-05-03 2024-03-31 13F SEI INVTS CO COM Stock 784117103 9,000 0 647 0.2167
2024-05-23 2023-12-31 13F/A-1 SEI INVTS CO COM Stock 784117103 9,000 0 0.00 572 5.35 0.2110
2024-02-09 2023-12-31 13F SEI INVTS CO COM Stock 784117103 9,000 0 572 0.1359
2023-11-14 2023-09-30 13F SEI INVTS CO COM Stock 784117103 9,000 0 0.00 542 1.12 0.1355
2023-08-11 2023-06-30 13F SEI INVTS CO COM Stock 784117103 9,000 0 0.00 537 3.68 0.1262
2023-05-11 2023-03-31 13F SEI INVTS CO COM Stock 784117103 9,000 -1,000 -10.00 518 -11.32 0.1161
2023-02-15 2022-12-31 13F SEI INVTS CO COM Stock 784117103 10,000 0 0.00 583 18.74 0.1325
2022-11-14 2022-09-30 13F SEI INVTS CO COM Stock 784117103 10,000 0 0.00 491 -9.07 0.2142
2022-08-12 2022-06-30 13F SEI INVTS CO COM Stock 784117103 10,000 0 0.00 540 -10.30 0.1309
2022-05-09 2022-03-31 13F SEI INVESTMENTS COM 784117103 10,000 -2,000 -16.67 602 -17.65 0.1980
2022-02-15 2021-12-31 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 731 2.67 0.1460
2021-11-10 2021-09-30 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 712 -4.30 0.2484
2021-08-12 2021-06-30 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 744 1.78 0.2455
2021-05-12 2021-03-31 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 731 5.94 0.2619
2021-02-09 2020-12-31 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 690 13.30 0.2472
2020-11-10 2020-09-30 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 609 -7.73 0.2559
2020-08-05 2020-06-30 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 660 18.71 0.2893
2020-05-07 2020-03-31 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 556 -29.26 0.3066
2020-02-11 2019-12-31 13F SEI INVESTMENTS COM 784117103 12,000 12,000 786 0.3484
2019-11-05 2019-09-30 13F SEI INVESTMENTS COM 784117103 0 -12,000 -100.00 0 -100.00
2019-08-08 2019-06-30 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 673 7.34 0.3175
2019-05-10 2019-03-31 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 627 13.18 0.3193
2019-02-11 2018-12-31 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 554 -24.42 0.3171
2018-11-06 2018-09-30 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 733 -2.27 0.3972
2018-08-02 2018-06-30 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 750 -16.57 0.3887
2018-08-28 2018-03-31 13F/A-1 SEI INVESTMENTS COM 784117103 12,000 0 0.00 899 4.29 0.4850
2018-05-03 2018-03-31 13F SEI INVESTMENTS COM 784117103 12,000 0 899
2018-02-06 2017-12-31 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 862 17.60 0.4636
2017-11-06 2017-09-30 13F SEI INVESTMENTS COM 784117103 12,000 0 0.00 733 13.64 0.2422
2017-07-25 2017-06-30 13F SEI INVESTMENTS COM 784117103 12,000 12,000 645 0.2227
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.