SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionHighTower Advisors, LLC
Latest Disclosed Ownership13,034 shares
Latest Disclosed Value $ 1,022,825
HighTower Advisors, LLC reports 14.05% increase in ownership of SEIC / SEI Investments Company

On May 5, 2026 - HighTower Advisors, LLC filed a 13F-HR form disclosing ownership of 13,034 shares of SEI Investments Company (MX:SEIC) valued at $1,022,825 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 11,428 shares of SEI Investments Company. This represents a change in shares of 14.05% 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)
2026-05-05 2026-03-31 13F SEI INVTS COM 784117103 13,034 1,606 14.05 1,023 9.07 0.0011
2026-02-06 2025-12-31 13F SEI INVTS COM 784117103 11,428 -148 -1.28 937 -4.58 0.0010
2025-11-07 2025-09-30 13F SEI INVTS COM 784117103 11,576 -155 -1.32 982 -6.83 0.0011
2025-08-11 2025-06-30 13F SEI INVTS COM 784117103 11,731 234 2.04 1,054 18.16 0.0013
2025-05-13 2025-03-31 13F SEI INVTS COM 784117103 11,497 -16 -0.14 893 -6.01 0.0012
2025-02-07 2024-12-31 13F SEI INVTS COM 784117103 11,513 574 5.25 950 24.70 0.0013
2024-11-14 2024-09-30 13F SEI INVTS COM 784117103 10,939 425 4.04 761 12.74 0.0011
2024-08-13 2024-06-30 13F SEI INVTS COM 784117103 10,514 853 8.83 675 -3.71 0.0010
2024-05-06 2024-03-31 13F SEI INVTS COM 784117103 9,661 -556 -5.44 701 9.02 0.0011
2024-02-12 2023-12-31 13F SEI INVTS COM 784117103 10,217 915 9.84 643 16.06 0.0011
2023-11-08 2023-09-30 13F SEI INVTS COM 784117103 9,302 909 10.83 554 11.02 0.0010
2023-08-14 2023-06-30 13F SEI INVTS COM 784117103 8,393 386 4.82 499 8.01 0.0010
2023-05-12 2023-03-31 13F SEI INVTS COM 784117103 8,007 -202 -2.46 462 -2.94 0.0010
2023-02-09 2022-12-31 13F SEI INVTS COM 784117103 8,209 245 3.08 476 21.12 0.0011
2022-11-09 2022-09-30 13F SEI INVTS COM 784117103 7,964 -13 -0.16 393 -9.03 0.0011
2022-08-10 2022-06-30 13F SEI INVTS COM 784117103 7,977 -1,177 -12.86 432 -21.60 0.0011
2022-05-12 2022-03-31 13F SEI INVTS COM 784117103 9,154 -22,914 -71.45 551 -71.76 0.0012
2022-02-10 2021-12-31 13F SEI INVTS COM 784117103 32,068 24,285 312.03 1,951 324.13 0.0043
2021-11-12 2021-09-30 13F SEI INVTS COM 784117103 7,783 -238 -2.97 460 -7.26 0.0012
2021-08-06 2021-06-30 13F SEI INVTS COM 784117103 8,021 -5 -0.06 496 2.06 0.0014
2021-05-10 2021-03-31 13F SEI INVTS COM 784117103 8,026 -211 -2.56 486 2.97 0.0015
2021-02-10 2020-12-31 13F SEI INVTS COM 784117103 8,237 8,237 472 0.0020
2020-05-21 2020-03-31 13F SEI INVESTMENTS COM 784117103 0 -8,046 -100.00 0 -100.00
2020-02-14 2019-12-31 13F SEI INVESTMENTS COM 784117103 8,046 -634 -7.30 524 1.55 0.0031
2019-11-12 2019-09-30 13F SEI INVESTMENTS COM 784117103 8,680 -1,120 -11.43 516 -6.18 0.0028
2019-08-13 2019-06-30 13F SEI INVESTMENTS COM 784117103 9,800 -2,243 -18.62 550 -13.11 0.0033
2019-05-15 2019-03-31 13F SEI INVESTMENTS COM 784117103 12,043 2,432 25.30 633 42.57 0.0042
2019-02-14 2018-12-31 13F SEI INVESTMENTS COM 784117103 9,611 1,766 22.51 444 -6.92 0.0034
2018-11-09 2018-09-30 13F SEI INVESTMENTS COM 784117103 7,845 488 6.63 477 3.02 0.0034
2018-08-14 2018-06-30 13F SEI INVESTMENTS COM 784117103 7,357 -208 -2.75 463 -18.34 0.0036
2018-05-15 2018-03-31 13F SEI INVESTMENTS COM 784117103 7,565 -2,496 -24.81 567 -21.58 0.0047
2018-02-14 2017-12-31 13F SEI INVESTMENTS COM 784117103 10,061 -1,801 -15.18 723 0.14 0.0059
2017-11-14 2017-09-30 13F SEI INVESTMENTS COM 784117103 11,862 82 0.70 722 14.42 0.0062
2017-09-22 2017-06-30 13F/A-1 SEI INVESTMENTS COM 784117103 11,780 4,877 70.65 631 81.32 0.0056
2017-08-14 2017-06-30 13F SEI INVESTMENTS COM 784117103 11,780 4,877 631
2017-05-15 2017-03-31 13F SEI INVESTMENTS COM 784117103 6,903 -876 -11.26 348 -9.14 0.0033
2017-02-10 2016-12-31 13F SEI INVESTMENTS COM 784117103 7,779 -4,067 -34.33 383 -29.21 0.0042
2016-11-14 2016-09-30 13F SEI INVESTMENTS COM 784117103 11,846 5,446 85.09 541 75.65 0.0063
2016-08-11 2016-06-30 13F SEI INVESTMENTS COM 784117103 6,400 -11,799 -64.83 308 -60.66 0.0039
2016-05-16 2016-03-31 13F SEI INVESTMENTS COM 784117103 18,199 -3,064 -14.41 783 -29.78 0.0026
2016-05-18 2015-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 21,263 11,772 124.03 1,115 143.98 0.0132
2016-02-12 2015-12-31 13F SEI INVESTMENTS COM 784117103 21,263 1,115
2015-11-16 2015-09-30 13F SEI INVESTMENTS COM 784117103 9,491 -10,250 -51.92 457 -52.79 0.0060
2015-08-11 2015-06-30 13F SEI INVESTMENTS COM 784117103 19,741 13,340 208.40 968 243.26 0.0155
2015-05-15 2015-03-31 13F SEI INVESTMENTS COM 784117103 6,401 74 1.17 282 11.46 0.0042
2015-02-17 2014-12-31 13F SEI INVESTMENTS COM 784117103 6,327 -30 -0.47 253 10.00 0.0039
2014-11-14 2014-09-30 13F SEI INVESTMENTS COM 784117103 6,357 -352 -5.25 230 4.55 0.0039
2014-08-13 2014-06-30 13F SEI INVESTMENTS COM 784117103 6,709 344 5.40 220 2.80 0.0038
2014-05-15 2014-03-31 13F SEI INVESTMENTS COM 784117103 6,365 -1,575 -19.84 214 -22.18 0.0042
2014-02-14 2013-12-31 13F SEI INVESTMENTS COM 784117103 7,940 951 13.61 275 27.31 0.0057
2013-11-15 2013-09-30 13F SEI INVESTMENTS COM 784117103 6,989 -1,151 -14.14 216 -6.90 0.0054
2013-08-14 2013-06-30 13F SEI INVESTMENTS COM 784117103 8,140 8,140 232 0.0063
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.