SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionRockefeller Capital Management L.P.
Latest Disclosed Ownership152,565 shares
Latest Disclosed Value $ 11,971,798
Rockefeller Capital Management L.P. reports 1.70% increase in ownership of SEIC / SEI Investments Company

On May 14, 2026 - Rockefeller Capital Management L.P. filed a 13F-HR form disclosing ownership of 152,565 shares of SEI Investments Company (MX:SEIC) valued at $11,971,798 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on March 16, 2026 disclosing 150,008 shares of SEI Investments Company. This represents a change in shares of 1.70% 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)
2026-05-14 2026-03-31 13F SEI INVTS COM 784117103 152,565 2,557 1.70 11,972 -2.70 0.0110
2026-03-16 2025-12-31 13F/A-1 SEI INVTS COM 784117103 150,008 30,122 25.13 12,304 20.95 0.0222
2026-02-14 2025-12-31 13F SEI INVTS COM 784117103 150,010 30,124 12,304 0.0112
2025-11-14 2025-09-30 13F SEI INVTS COM 784117103 119,886 19,849 19.84 10,172 13.16 0.0199
2025-08-14 2025-06-30 13F/A-1 SEI INVTS COM 784117103 100,037 100,037 8,989 0.0197
2024-08-12 2024-06-30 13F SEI INVTS COM 784117103 0 -15,385 -100.00 0 -100.00
2024-05-14 2024-03-31 13F SEI INVTS COM 784117103 15,385 15,385 1,106 0.0032
2023-05-17 2023-03-31 13F SEI INVTS COM 784117103 0 -2,404 -100.00 0 -100.00
2023-03-06 2022-12-31 13F SEI INVTS COM 784117103 2,404 557 30.16 139 54.44 0.0007
2022-11-02 2022-09-30 13F SEI INVTS COM 784117103 1,847 43 2.38 90 -7.22 0.0005
2022-08-12 2022-06-30 13F SEI INVTS COM 784117103 1,804 412 29.60 97 16.87 0.0005
2022-05-13 2022-03-31 13F SEI INVTS COM 784117103 1,392 118 9.26 83 7.79 0.0004
2022-02-14 2021-12-31 13F SEI INVTS COM 784117103 1,274 -300 -19.06 77 -17.20 0.0004
2021-11-12 2021-09-30 13F SEI INVTS COM 784117103 1,574 135 9.38 93 4.49 0.0005
2021-08-10 2021-06-30 13F SEI INVTS COM 784117103 1,439 -235 -14.04 89 -12.75 0.0005
2021-05-11 2021-03-31 13F SEI INVTS COM 784117103 1,674 1,118 201.08 102 229.03 0.0007
2021-02-12 2020-12-31 13F SEI INVTS COM 784117103 556 198 55.31 31 72.22 0.0002
2020-11-13 2020-09-30 13F SEI INVTS COM 784117103 358 -66 -15.57 18 -21.74 0.0002
2020-08-12 2020-06-30 13F SEI INVTS COM 784117103 424 110 35.03 23 53.33 0.0002
2020-05-12 2020-03-31 13F SEI INVESTMENTS COM 784117103 314 -133 -29.75 15 -48.28 0.0002
2020-02-07 2019-12-31 13F SEI INVESTMENTS COM 784117103 447 10 2.29 29 11.54 0.0004
2019-11-12 2019-09-30 13F SEI INVESTMENTS COM 784117103 437 250 133.69 26 160.00 0.0004
2019-08-09 2019-06-30 13F SEI INVESTMENTS COM 784117103 187 -1,537 -89.15 10 -88.89 0.0001
2019-05-10 2019-03-31 13F SEI INVESTMENTS COM 784117103 1,724 1,329 336.46 90 400.00 0.0013
2019-02-12 2018-12-31 13F SEI INVESTMENTS COM 784117103 395 0 0.00 18 -25.00 0.0003
2018-11-02 2018-09-30 13F SEI Investments Common 784117103 395 0 0.00 24 -4.00 0.0004
2018-07-31 2018-06-30 13F SEI Investments Common 784117103 395 395 25 0.0004
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.