SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionNorthwestern Mutual Wealth Management Co
Latest Disclosed Ownership1,787 shares
Latest Disclosed Value $ 140,226
Northwestern Mutual Wealth Management Co reports 1.02% increase in ownership of SEIC / SEI Investments Company

On May 7, 2026 - Northwestern Mutual Wealth Management Co filed a 13F-HR form disclosing ownership of 1,787 shares of SEI Investments Company (MX:SEIC) valued at $140,226 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on February 10, 2026 disclosing 1,769 shares of SEI Investments Company. This represents a change in shares of 1.02% 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)
2026-05-07 2026-03-31 13F SEI INVTS COM 784117103 1,787 18 1.02 140 -3.45 0.0001
2026-02-10 2025-12-31 13F/A-1 SEI INVTS COM 784117103 1,769 683 62.89 145 57.61 0.0001
2026-02-05 2025-12-31 13F SEI INVTS COM 784117103 15,701 14,615 663 0.0004
2025-11-14 2025-09-30 13F SEI INVTS COM 784117103 1,086 53 5.13 92 0.00 0.0001
2025-08-13 2025-06-30 13F SEI INVTS COM 784117103 1,033 -15 -1.43 93 13.58 0.0001
2025-05-14 2025-03-31 13F SEI INVTS COM 784117103 1,048 -16 -1.50 81 -6.90 0.0001
2025-02-11 2024-12-31 13F SEI INVTS COM 784117103 1,064 -67 -5.92 88 11.54 0.0001
2024-11-12 2024-09-30 13F SEI INVTS COM 784117103 1,131 -66 -5.51 78 1.30 0.0001
2024-08-16 2024-06-30 13F SEI INVTS COM 784117103 1,197 168 16.33 77 5.48 0.0001
2024-05-15 2024-03-31 13F SEI INVTS COM 784117103 1,029 -210 -16.95 74 -6.41 0.0001
2024-02-13 2023-12-31 13F SEI INVTS COM 784117103 1,239 172 16.12 79 21.88 0.0001
2023-11-14 2023-09-30 13F SEI INVTS COM 784117103 1,067 462 76.36 64 77.78 0.0001
2023-08-14 2023-06-30 13F SEI INVTS COM 784117103 605 243 67.13 36 80.00 0.0000
2023-05-15 2023-03-31 13F SEI INVTS COM 784117103 362 115 46.56 21 42.86 0.0000
2023-02-21 2022-12-31 13F SEI INVTS COM 784117103 247 3 1.23 14 16.67 0.0000
2022-11-14 2022-09-30 13F SEI INVTS COM 784117103 244 -45 -15.57 12 -20.00 0.0000
2022-08-04 2022-06-30 13F SEI INVTS COM 784117103 289 29 11.15 15 0.00 0.0000
2022-05-09 2022-03-31 13F SEI INVTS COM 784117103 260 190 271.43 15 275.00 0.0000
2022-02-03 2021-12-31 13F SEI INVTS COM 784117103 70 27 62.79 4 33.33 0.0000
2021-11-15 2021-09-30 13F SEI INVTS COM 784117103 43 9 26.47 3 50.00 0.0000
2021-08-13 2021-06-30 13F SEI INVTS COM 784117103 34 0 0.00 2 0.00 0.0000
2021-05-14 2021-03-31 13F SEI INVTS COM 784117103 34 34 2 0.0000
2020-08-14 2020-06-30 13F SEI INVESTMENTS COM 784117103 0 -40 -100.00 0 -100.00
2020-05-08 2020-03-31 13F SEI INVESTMENTS COM 784117103 40 -265 -86.89 2 -90.00 0.0000
2020-02-13 2019-12-31 13F SEI INVESTMENTS COM 784117103 305 90 41.86 20 53.85 0.0001
2019-11-12 2019-09-30 13F SEI INVESTMENTS COM 784117103 215 -294 -57.76 13 -55.17 0.0000
2019-08-12 2019-06-30 13F SEI INVESTMENTS COM 784117103 509 41 8.76 29 20.83 0.0001
2019-05-10 2019-03-31 13F SEI INVESTMENTS COM 784117103 468 -759 -61.86 24 -57.14 0.0001
2019-02-12 2018-12-31 13F SEI INVESTMENTS COM 784117103 1,227 -72 -5.54 56 -29.11 0.0003
2018-11-01 2018-09-30 13F SEI INVESTMENTS COM 784117103 1,299 0 0.00 79 -2.47 0.0004
2018-08-10 2018-06-30 13F SEI INVESTMENTS COM 784117103 1,299 2 0.15 81 -16.49 0.0005
2018-05-14 2018-03-31 13F SEI INVESTMENTS COM 784117103 1,297 -268 -17.12 97 -14.16 0.0006
2018-01-31 2017-12-31 13F SEI INVESTMENTS COM 784117103 1,565 -23 -1.45 113 16.49 0.0007
2017-11-07 2017-09-30 13F SEI INVESTMENTS COM 784117103 1,588 23 1.47 97 15.48 0.0007
2017-08-10 2017-06-30 13F SEI INVESTMENTS COM 784117103 1,565 -122 -7.23 84 -1.18 0.0007
2017-05-09 2017-03-31 13F SEI INVESTMENTS COM 784117103 1,687 -250 -12.91 85 -10.53 0.0008
2017-02-15 2016-12-31 13F SEI INVESTMENTS COM 784117103 1,937 -195 -9.15 95 -2.06 0.0010
2016-11-14 2016-09-30 13F SEI INVESTMENTS COM 784117103 2,132 5 0.24 97 -4.90 0.0015
2016-08-29 2016-06-30 13F SEI INVESTMENTS COM 784117103 2,127 1,402 193.38 102 229.03 0.0015
2016-05-16 2016-03-31 13F SEI INVESTMENTS COM 784117103 725 233 47.36 31 19.23 0.0005
2016-02-16 2015-12-31 13F SEI INVESTMENTS COM 784117103 492 210 74.47 26 85.71 0.0005
2015-11-16 2015-09-30 13F SEI INVESTMENTS COM 784117103 282 -4,195 -93.70 14 -93.64 0.0003
2015-09-30 2015-06-30 13F/A-1 SEI INVESTMENTS COM 784117103 4,477 4,477 0.00 220 0.0057
2015-05-15 2015-03-31 13F SEI INVESTMENTS COM 784117103 0 -814 -100.00 0 -100.00
2015-02-13 2014-12-31 13F SEI INVESTMENTS COM 784117103 814 103 14.49 33 26.92 0.0010
2014-11-14 2014-09-30 13F SEI INVESTMENTS COM 784117103 711 0 0.00 26 13.04 0.0009
2014-08-05 2014-06-30 13F SEI INVESTMENTS COM 784117103 711 167 30.70 23 27.78 0.0009
2014-05-15 2014-03-31 13F SEI INVESTMENTS COM 784117103 544 400 277.78 18 260.00 0.0008
2014-02-14 2013-12-31 13F SEI INVESTMENTS COM 784117103 144 -24 -14.29 5 0.00 0.0002
2013-11-14 2013-09-30 13F SEI INVESTMENTS COM 784117103 168 -135 -44.55 5 -44.44 0.0003
2013-08-21 2013-06-30 13F/A-1 SEI INVESTMENTS COM 784117103 303 303 9 0.0005
2013-08-14 2013-06-30 13F SEI INVESTMENTS COM 784117103 79,690 2,266 0.0249
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.