SEI Investments Company
DE ˙ DB ˙ US7841171033
73,00 € 0,00 (0,00%)
2026-06-04
AKTIENPREIS
SecurityDE:SI3 / SEI Investments Company
InstitutionBoston Partners
Latest Disclosed Ownership1,770,039 shares
Latest Disclosed Value $ 138,887,658
Boston Partners ownership in SI3 / SEI Investments Company

On May 11, 2026 - Boston Partners filed a 13F-HR form disclosing ownership of 1,770,039 shares of SEI Investments Company (DE:SI3) valued at $116,822,574 USD as of March 31, 2026. The entity filed a previous 13F-HR on November 2, 2017 disclosing 0 shares of SEI Investments Company. The current value of the position is $129,212,847 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)
2026-05-11 2026-03-31 13F SEI INVTS COM 784117103 1,770,039 1,770,039 138,888 0.0622
2017-11-02 2017-09-30 13F SEI INVESTMENTS COM 784117103 0 -1,072,221 -100.00 0 -100.00
2017-08-02 2017-06-30 13F SEI INVESTMENTS COM 784117103 1,072,221 -1,918,308 -64.15 57,664 -61.77 0.0733
2017-05-03 2017-03-31 13F SEI INVESTMENTS COM 784117103 2,990,529 339,121 12.79 150,843 15.26 0.1926
2017-02-06 2016-12-31 13F SEI INVESTMENTS COM 784117103 2,651,408 -529,516 -16.65 130,873 -9.79 0.1721
2016-11-09 2016-09-30 13F SEI INVESTMENTS COM 784117103 3,180,924 -462,383 -12.69 145,082 -17.23 0.2029
2016-08-05 2016-06-30 13F SEI INVESTMENTS COM 784117103 3,643,307 388,821 11.95 175,280 25.11 0.2533
2016-05-12 2016-03-31 13F SEI INVESTMENTS COM 784117103 3,254,486 330,499 11.30 140,106 -8.56 0.2064
2016-02-08 2015-12-31 13F SEI INVESTMENTS COM 784117103 2,923,987 232,657 8.64 153,217 18.04 0.2195
2015-11-10 2015-09-30 13F SEI INVESTMENTS COM 784117103 2,691,330 -262,029 -8.87 129,802 -10.36 0.1979
2015-08-10 2015-06-30 13F SEI INVESTMENTS COM 784117103 2,953,359 525,374 21.64 144,803 35.27 0.2080
2015-05-05 2015-03-31 13F SEI INVESTMENTS COM 784117103 2,427,985 -295,704 -10.86 107,050 -1.84 0.1594
2015-02-09 2014-12-31 13F SEI INVESTMENTS COM 784117103 2,723,689 220,180 8.79 109,057 20.47 0.1637
2014-11-12 2014-09-30 13F SEI INVESTMENTS COM 784117103 2,503,509 151,489 6.44 90,527 17.45 0.1469
2014-08-08 2014-06-30 13F SEI INVESTMENTS COM 784117103 2,352,020 323,611 15.95 77,075 13.05 0.1291
2014-05-07 2014-03-31 13F SEI INVESTMENTS COM 784117103 2,028,409 414,423 25.68 68,175 21.63 0.1244
2014-02-06 2013-12-31 13F SEI INVESTMENTS COM 784117103 1,613,986 372,828 30.04 56,053 46.11 0.1149
2013-11-12 2013-09-30 13F SEI INVESTMENTS COM 784117103 1,241,158 304,596 32.52 38,364 44.08 0.0925
2013-08-01 2013-06-30 13F SEI INVESTMENTS COM 784117103 936,562 936,562 26,626 0.0733
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.