SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionSG Americas Securities, LLC
Latest Disclosed Ownership19,528 shares
Latest Disclosed Value $ 1,532
SG Americas Securities, LLC reports 7.29% decrease in ownership of SEIC / SEI Investments Company

On April 16, 2026 - SG Americas Securities, LLC filed a 13F-HR form disclosing ownership of 19,528 shares of SEI Investments Company (MX:SEIC) valued at $1,532 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 9, 2026 disclosing 21,063 shares of SEI Investments Company. This represents a change in shares of -7.29% 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)
2026-04-16 2026-03-31 13F SEI INVTS CO COM COM 784117103 19,528 -1,535 -7.29 2 0.00 0.0016
2026-01-09 2025-12-31 13F SEI INVTS CO COM COM 784117103 21,063 -9,958 -32.10 2 -50.00 0.0022
2025-10-23 2025-09-30 13F SEI INVTS CO COM COM 784117103 31,021 19,035 158.81 3 100.00 0.0089
2025-08-08 2025-06-30 13F SEI INVTS CO COM COM 784117103 11,986 6,498 118.40 1 0.0045
2025-04-15 2025-03-31 13F SEI INVTS CO COM COM 784117103 5,488 -19,311 -77.87 0 -100.00 0.0014
2025-01-17 2024-12-31 13F SEI INVTS CO COM COM 784117103 24,799 11,739 89.89 2 0.0084
2024-10-03 2024-09-30 13F SEI INVTS CO COM COM 784117103 13,060 -9,101 -41.07 1 -100.00 0.0033
2024-07-12 2024-06-30 13F SEI INVTS CO COM COM 784117103 22,161 22,161 1 0.0084
2024-05-06 2024-03-31 13F SEI INVTS CO COM COM 784117103 0 -11,291 -100.00 0 0.0000
2024-01-12 2023-12-31 13F SEI INVTS CO COM COM 784117103 11,291 306 2.79 1 0.0067
2023-10-13 2023-09-30 13F SEI INVTS CO COM COM 784117103 10,985 -13,496 -55.13 1 -100.00 0.0076
2023-07-10 2023-06-30 13F SEI INVTS CO COM COM 784117103 24,481 -21,523 -46.79 1 -50.00 0.0110
2023-04-28 2023-03-31 13F SEI INVTS CO COM COM 784117103 46,004 12,250 36.29 3 100.00 0.0308
2023-02-02 2022-12-31 13F SEI INVTS CO COM COM 784117103 33,754 33,754 2 0.0240
2022-10-31 2022-09-30 13F SEI INVTS CO COM COM 784117103 0 -10,768 -100.00 0 -100.00
2022-07-29 2022-06-30 13F SEI INVTS CO COM COM 784117103 10,768 -5,414 -33.46 582 -40.25 0.0062
2022-04-29 2022-03-31 13F SEI INVTS CO COM COM 784117103 16,182 -24,703 -60.42 974 -60.91 0.0071
2022-02-07 2021-12-31 13F SEI INVTS CO COM COM 784117103 40,885 17,105 71.93 2,492 76.74 0.0136
2021-11-01 2021-09-30 13F SEI INVTS CO COM COM 784117103 23,780 -250 -1.04 1,410 -5.31 0.0066
2021-08-12 2021-06-30 13F SEI INVTS CO COM COM 784117103 24,030 7,564 45.94 1,489 48.45 0.0069
2021-05-13 2021-03-31 13F SEI INVTS CO COM COM 784117103 16,466 -63,545 -79.42 1,003 -78.19 0.0053
2021-02-04 2020-12-31 13F SEI INVTS CO COM COM 784117103 80,011 77,124 2,671.42 4,598 3,049.32 0.0245
2020-11-09 2020-09-30 13F SEI INVTS CO COM COM 784117103 2,887 -28,966 -90.94 146 -91.66 0.0009
2020-07-20 2020-06-30 13F SEI INVTS CO COM COM 784117103 31,853 26,814 532.13 1,751 648.29 0.0146
2020-04-30 2020-03-31 13F SEI INVESTMENTS CO COM COM 784117103 5,039 -4,439 -46.83 234 -62.32 0.0022
2020-01-28 2019-12-31 13F SEI INVESTMENTS CO COM COM 784117103 9,478 -12,999 -57.83 621 -53.38 0.0057
2019-11-04 2019-09-30 13F SEI INVESTMENTS CO COM COM 784117103 22,477 4,632 25.96 1,332 33.07 0.0109
2019-07-29 2019-06-30 13F SEI INVESTMENTS CO COM COM 784117103 17,845 9,913 124.97 1,001 141.79 0.0069
2019-04-29 2019-03-31 13F SEI INVESTMENTS CO COM COM 784117103 7,932 -11,680 -59.56 414 -54.30 0.0038
2019-01-31 2018-12-31 13F SEI INVESTMENTS CO COM COM 784117103 19,612 -9,886 -33.51 906 -49.72 0.0079
2018-11-06 2018-09-30 13F SEI INVESTMENTS CO COM COM 784117103 29,498 -53,664 -64.53 1,802 -65.34 0.0134
2018-08-07 2018-06-30 13F SEI INVESTMENTS CO COM COM 784117103 83,162 26,089 45.71 5,199 21.61 0.0469
2018-05-03 2018-03-31 13F SEI INVESTMENTS CO COM COM 784117103 57,073 27,770 94.77 4,275 102.99 0.0342
2018-01-24 2017-12-31 13F SEI INVESTMENTS CO COM COM 784117103 29,303 22,690 343.11 2,106 421.29 0.0196
2017-11-07 2017-09-30 13F SEI INVESTMENTS CO COM COM 784117103 6,613 -36,351 -84.61 404 -82.52 0.0035
2017-08-03 2017-06-30 13F SEI INVESTMENTS CO COM COM 784117103 42,964 7,133 19.91 2,311 27.89 0.0208
2017-05-10 2017-03-31 13F SEI INVESTMENTS CO COM COM 784117103 35,831 28,977 422.78 1,807 434.62 0.0160
2017-02-08 2016-12-31 13F SEI INVESTMENTS CO COM COM 784117103 6,854 2,481 56.73 338 69.85 0.0028
2017-02-08 2016-09-30 13F/A-1 SEI INVESTMENTS CO COM COM 784117103 4,373 -33,330 -88.40 199 -89.03 0.0021
2016-11-08 2016-09-30 13F SEI INVESTMENTS CO COM COM 784117103 4,373 199
2016-08-03 2016-06-30 13F SEI INVESTMENTS CO COM COM 784117103 37,703 -32,134 -46.01 1,814 -39.65 0.0129
2016-05-12 2016-03-31 13F SEI INVESTMENTS CO COM COM 784117103 69,837 23,541 50.85 3,006 23.91 0.0217
2016-02-12 2015-12-31 13F SEI INVESTMENTS CO COM COM 784117103 46,296 42,969 1,291.52 2,426 1,416.25 0.0172
2015-11-09 2015-09-30 13F SEI INVESTMENTS CO COM COM 784117103 3,327 -20,362 -85.96 160 -86.22 0.0010
2015-08-06 2015-06-30 13F SEI INVESTMENTS CO COM COM 784117103 23,689 19,514 467.40 1,161 530.98 0.0076
2015-05-13 2015-03-31 13F SEI INVESTMENTS CO COM COM 784117103 4,175 -27,877 -86.97 184 -85.66 0.0011
2015-02-12 2014-12-31 13F SEI INVESTMENTS CO COM COM 784117103 32,052 2,121 7.09 1,283 18.58 0.0063
2014-11-13 2014-09-30 13F SEI INVESTMENTS CO COM COM 784117103 29,931 -39,678 -57.00 1,082 -52.56 0.0064
2014-08-13 2014-06-30 13F SEI INVESTMENTS CO COM COM 784117103 69,609 23,106 49.69 2,281 45.94 0.0132
2014-05-14 2014-03-31 13F SEI INVESTMENTS CO COM COM 784117103 46,503 1,295 2.86 1,563 -0.45 0.0068
2014-02-12 2013-12-31 13F SEI INVESTMENTS CO COM COM 784117103 45,208 -12,236 -21.30 1,570 -11.60 0.0065
2013-11-12 2013-09-30 13F SEI INVESTMENTS CO COM COM 784117103 57,444 36,342 172.22 1,776 196.00 0.0073
2013-08-13 2013-06-30 13F SEI INVESTMENTS CO COM COM 784117103 21,102 21,102 600 0.0029
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.