SEI Investments Company
DE ˙ DB ˙ US7841171033
74,00 € 0,00 (0,00%)
2026-06-01
CENA AKCJI
SecurityDE:SI3 / SEI Investments Company
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership126,476 shares
Latest Disclosed Value $ 10,373,562
Alliancebernstein L.p. reports 1.19% increase in ownership of SI3 / SEI Investments Company

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 126,476 shares of SEI Investments Company (DE:SI3) valued at $8,347,416 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 124,986 shares of SEI Investments Company. This represents a change in shares of 1.19% during the quarter. The current value of the position is $9,359,224 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 126,476 1,490 1.19 10,374 1.19 0.0034
2026-02-17 2025-12-31 13F SEI INVTS COM 784117103 124,986 -4,989 -3.84 10,251 -7.05 0.0032
2025-11-14 2025-09-30 13F SEI INVTS COM 784117103 129,975 3,442 2.72 11,028 -3.01 0.0035
2025-08-14 2025-06-30 13F SEI INVTS COM 784117103 126,533 -855 -0.67 11,370 14.98 0.0037
2025-05-15 2025-03-31 13F SEI INVTS COM 784117103 127,388 -41,746 -24.68 9,889 -29.11 0.0036
2025-02-12 2024-12-31 13F SEI INVTS COM 784117103 169,134 32,121 23.44 13,950 47.17 0.0047
2024-11-14 2024-09-30 13F SEI INVTS COM 784117103 137,013 -11,933 -8.01 9,480 -1.62 0.0032
2024-08-14 2024-06-30 13F SEI INVTS COM 784117103 148,946 -16,001 -9.70 9,635 -18.75 0.0034
2024-05-14 2024-03-31 13F SEI INVTS COM 784117103 164,947 16,145 10.85 11,860 25.41 0.0042
2024-02-14 2023-12-31 13F SEI INVTS COM 784117103 148,802 2,689 1.84 9,456 7.45 0.0036
2023-11-14 2023-09-30 13F SEI INVTS COM 784117103 146,113 -5,824 -3.83 8,800 -2.85 0.0037
2023-08-15 2023-06-30 13F SEI INVTS COM 784117103 151,937 -1,869 -1.22 9,058 2.34 0.0037
2023-05-15 2023-03-31 13F SEI INVTS COM 784117103 153,806 -2,878 -1.84 8,852 -3.10 0.0038
2023-02-15 2022-12-31 13F SEI INVTS COM 784117103 156,684 -14 -0.01 9,135 18.84 0.0041
2022-11-15 2022-09-30 13F SEI INVTS COM 784117103 156,698 -3,788 -2.36 7,686 -11.34 0.0037
2022-08-15 2022-06-30 13F SEI INVTS COM 784117103 160,486 -10,171 -5.96 8,669 -15.63 0.0040
2022-05-13 2022-03-31 13F SEI INVTS COM 784117103 170,657 -25,965 -13.21 10,275 -14.25 0.0040
2022-02-14 2021-12-31 13F SEI INVTS COM 784117103 196,622 21,499 12.28 11,982 15.38 0.0042
2021-11-10 2021-09-30 13F SEI INVTS COM 784117103 175,123 -11,563 -6.19 10,385 -10.23 0.0041
2021-07-30 2021-06-30 13F SEI INVTS COM 784117103 186,686 -4,210 -2.21 11,569 -0.53 0.0046
2021-05-06 2021-03-31 13F SEI INVTS COM 784117103 190,896 -1,381 -0.72 11,631 5.26 0.0051
2021-02-08 2020-12-31 13F SEI INVTS COM 784117103 192,277 -6,365 -3.20 11,050 9.68 0.0052
2020-11-12 2020-09-30 13F SEI INVTS COM 784117103 198,642 -7,839 -3.80 10,075 -11.25 0.0054
2020-08-13 2020-06-30 13F SEI INVTS COM 784117103 206,481 -14,550 -6.58 11,352 10.83 0.0067
2020-05-14 2020-03-31 13F SEI INVESTMENTS COM 784117103 221,031 -2,286 -1.02 10,243 -29.95 0.0073
2020-02-18 2019-12-31 13F SEI INVESTMENTS COM 784117103 223,317 7,956 3.69 14,623 14.59 0.0083
2019-11-14 2019-09-30 13F SEI INVESTMENTS COM 784117103 215,361 -4,879 -2.22 12,761 3.29 0.0079
2019-08-14 2019-06-30 13F SEI INVESTMENTS COM 784117103 220,240 -31,606 -12.55 12,355 -6.11 0.0077
2019-05-14 2019-03-31 13F SEI INVESTMENTS COM 784117103 251,846 14,944 6.31 13,159 20.23 0.0086
2019-02-13 2018-12-31 13F SEI INVESTMENTS COM 784117103 236,902 138,465 140.66 10,945 81.96 0.0081
2018-11-08 2018-09-30 13F SEI INVESTMENTS COM 784117103 98,437 -2,887 -2.85 6,015 -5.05 0.0039
2018-08-13 2018-06-30 13F SEI INVESTMENTS COM 784117103 101,324 7,608 8.12 6,335 -9.76 0.0044
2018-05-14 2018-03-31 13F SEI INVESTMENTS COM 784117103 93,716 -1,200 -1.26 7,020 2.92 0.0051
2018-02-13 2017-12-31 13F SEI INVESTMENTS COM 784117103 94,916 -950 -0.99 6,821 16.52 0.0049
2017-11-13 2017-09-30 13F SEI INVESTMENTS COM 784117103 95,866 -350 -0.36 5,854 13.14 0.0044
2017-08-10 2017-06-30 13F SEI INVESTMENTS COM 784117103 96,216 2,561 2.73 5,174 9.53 0.0040
2017-05-11 2017-03-31 13F SEI INVESTMENTS COM 784117103 93,655 -290 -0.31 4,724 1.88 0.0038
2017-02-13 2016-12-31 13F SEI INVESTMENTS COM 784117103 93,945 -1,817 -1.90 4,637 6.16 0.0039
2016-11-10 2016-09-30 13F SEI INVESTMENTS COM 784117103 95,762 -430 -0.45 4,368 -5.62 0.0037
2016-08-11 2016-06-30 13F SEI INVESTMENTS COM 784117103 96,192 -2,650 -2.68 4,628 8.77 0.0040
2016-05-13 2016-03-31 13F SEI INVESTMENTS COM 784117103 98,842 -6,180 -5.88 4,255 -22.68 0.0036
2016-02-16 2015-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 105,022 -2,503 -2.33 5,503 6.11 0.0047
2016-02-12 2015-12-31 13F SEI INVESTMENTS COM 784117103 105,022 5,065
2015-11-13 2015-09-30 13F SEI INVESTMENTS COM 784117103 107,525 -3,005 -2.72 5,186 -4.30 0.0045
2015-08-14 2015-06-30 13F SEI INVESTMENTS COM 784117103 110,530 -4,609 -4.00 5,419 6.76 0.0045
2015-05-13 2015-03-31 13F SEI INVESTMENTS COM 784117103 115,139 -4,883 -4.07 5,076 5.62 0.0041
2015-02-13 2014-12-31 13F SEI INVESTMENTS COM 784117103 120,022 2,145 1.82 4,806 12.76 0.0040
2014-11-13 2014-09-30 13F SEI INVESTMENTS COM 784117103 117,877 467 0.40 4,262 10.76 0.0036
2014-08-13 2014-06-30 13F SEI INVESTMENTS COM 784117103 117,410 -40,235 -25.52 3,848 -27.37 0.0032
2014-05-13 2014-03-31 13F SEI INVESTMENTS COM 784117103 157,645 19,366 14.01 5,298 10.33 0.0046
2014-02-13 2013-12-31 13F SEI INVESTMENTS COM 784117103 138,279 -1,947 -1.39 4,802 10.80 0.0043
2013-11-14 2013-09-30 13F SEI INVESTMENTS COM 784117103 140,226 7,268 5.47 4,334 14.66 0.0043
2013-08-13 2013-06-30 13F SEI INVESTMENTS COM 784117103 132,958 132,958 3,780 0.0040
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.