SEI Investments Company
US ˙ NasdaqGS ˙ US7841171033

SecuritySEIC / SEI Investments Company
InstitutionEngineers Gate Manager LP
Latest Disclosed Ownership44,033 shares
Latest Disclosed Value $ 3,455,269
Engineers Gate Manager LP reports 63.52% decrease in ownership of SEIC / SEI Investments Company

On May 15, 2026 - Engineers Gate Manager LP filed a 13F-HR form disclosing ownership of 44,033 shares of SEI Investments Company (US:SEIC) valued at $3,455,270 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 120,721 shares of SEI Investments Company. This represents a change in shares of -63.52% during the quarter. The current value of the position is $3,831,311 USD.

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)
2026-05-15 2026-03-31 13F SEI INVTS COM 784117103 44,033 -76,688 -63.52 3,455 -65.10 0.0432
2026-02-17 2025-12-31 13F SEI INVTS COM 784117103 120,721 23,627 24.33 9,902 20.19 0.1174
2025-11-14 2025-09-30 13F SEI INVTS COM 784117103 97,094 9,977 11.45 8,238 5.24 0.0943
2025-08-14 2025-06-30 13F SEI INVTS COM 784117103 87,117 71,980 475.52 7,828 566.21 0.0974
2025-05-15 2025-03-31 13F SEI INVTS COM 784117103 15,137 -4,062 -21.16 1,175 -25.77 0.0198
2025-02-14 2024-12-31 13F SEI INVTS COM 784117103 19,199 -21,200 -52.48 1,584 -43.36 0.0276
2024-11-14 2024-09-30 13F SEI INVTS COM 784117103 40,399 13,184 48.44 2,795 58.81 0.0546
2024-08-14 2024-06-30 13F SEI INVTS COM 784117103 27,215 20,213 288.67 1,761 249.90 0.0397
2024-05-15 2024-03-31 13F SEI INVTS COM 784117103 7,002 -33,113 -82.55 503 -80.27 0.0133
2024-02-14 2023-12-31 13F SEI INVTS COM 784117103 40,115 31,718 377.73 2,549 404.75 0.0728
2023-11-14 2023-09-30 13F SEI INVTS COM 784117103 8,397 -7,393 -46.82 506 -46.33 0.0187
2023-08-14 2023-06-30 13F SEI INVTS COM 784117103 15,790 -5,587 -26.14 941 -23.50 0.0356
2023-05-15 2023-03-31 13F SEI INVTS COM 784117103 21,377 21,377 1,230 0.0514
2023-02-14 2022-12-31 13F SEI INVTS COM 784117103 0 -5,162 -100.00 0 -100.00
2022-11-14 2022-09-30 13F SEI INVTS COM 784117103 5,162 -6,470 -55.62 253 -59.71 0.0157
2022-08-15 2022-06-30 13F SEI INVTS COM 784117103 11,632 -7,057 -37.76 628 -44.18 0.0230
2022-05-16 2022-03-31 13F SEI INVTS COM 784117103 18,689 6,055 47.93 1,125 46.10 0.0440
2022-02-14 2021-12-31 13F SEI INVTS COM 784117103 12,634 4,409 53.60 770 57.79 0.0346
2021-11-15 2021-09-30 13F SEI INVTS COM 784117103 8,225 8,225 488 0.0278
2021-08-16 2021-06-30 13F SEI INVTS COM 784117103 0 -16,867 -100.00 0 -100.00
2021-05-17 2021-03-31 13F SEI INVTS COM 784117103 16,867 -13,936 -45.24 1,028 -41.92 0.0509
2021-02-16 2020-12-31 13F SEI INVTS COM 784117103 30,803 30,803 1,770 0.0767
2020-11-16 2020-09-30 13F SEI INVTS COM 784117103 0 -21,353 -100.00 0 -100.00
2020-08-17 2020-06-30 13F SEI INVTS COM 784117103 21,353 12,188 132.98 1,174 176.24 0.0597
2020-05-15 2020-03-31 13F SEI INVESTMENTS COM 784117103 9,165 9,165 425 0.0306
2016-08-11 2016-06-30 13F SEI INVESTMENTS COM 784117103 0 -5,861 -100.00 0 -100.00
2016-05-09 2016-03-31 13F SEI INVESTMENTS COM 784117103 5,861 5,861 0.00 252 0.0196
2016-02-05 2015-12-31 13F SEI INVESTMENTS COM 784117103 0 0 0 0.0000
2015-11-16 2015-09-30 13F SEI INVESTMENTS COM 784117103 0 -8,700 -100.00 0 -100.00
2015-08-14 2015-06-30 13F SEI INVESTMENTS COM 784117103 8,700 8,700 427 0.0418
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.