SEI投資公司
US ˙ NasdaqGS ˙ US7841171033

SecuritySEIC / SEI Investments Company
InstitutionAviva Plc
Latest Disclosed Ownership5,629 shares
Latest Disclosed Value $ 441,708
Aviva Plc reports 57.99% decrease in ownership of SEIC / SEI Investments Company

On May 14, 2026 - Aviva Plc filed a 13F-HR form disclosing ownership of 5,629 shares of SEI Investments Company (US:SEIC) valued at $441,708 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 13,398 shares of SEI Investments Company. This represents a change in shares of -57.99% during the quarter. The current value of the position is $498,617 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)
2026-05-14 2026-03-31 13F SEI INVTS COM 784117103 5,629 -7,769 -57.99 442 -59.84 0.0007
2026-02-12 2025-12-31 13F SEI INVTS COM 784117103 13,398 1,629 13.84 1,099 10.02 0.0019
2025-11-13 2025-09-30 13F SEI INVTS COM 784117103 11,769 219 1.90 999 -3.76 0.0018
2025-08-07 2025-06-30 13F SEI INVTS COM 784117103 11,550 3,613 45.52 1,038 68.34 0.0021
2025-05-15 2025-03-31 13F SEI INVTS COM 784117103 7,937 565 7.66 616 1.32 0.0015
2025-02-13 2024-12-31 13F SEI INVTS COM 784117103 7,372 -2,191 -22.91 608 -8.02 0.0016
2024-11-14 2024-09-30 13F SEI INVTS COM 784117103 9,563 -3,707 -27.94 662 -22.96 0.0017
2024-08-02 2024-06-30 13F SEI INVTS COM 784117103 13,270 239 1.83 858 -8.33 0.0024
2024-05-14 2024-03-31 13F SEI INVTS COM 784117103 13,031 -1,032 -7.34 937 4.82 0.0031
2024-02-09 2023-12-31 13F SEI INVTS COM 784117103 14,063 377 2.75 894 8.37 0.0032
2023-11-13 2023-09-30 13F SEI INVTS COM 784117103 13,686 -14,417 -51.30 824 -50.81 0.0035
2023-08-10 2023-06-30 13F SEI INVTS COM 784117103 28,103 -30,230 -51.82 1,676 -50.10 0.0068
2023-05-12 2023-03-31 13F SEI INVTS COM 784117103 58,333 23,020 65.19 3,357 63.12 0.0152
2023-02-14 2022-12-31 13F/A-2 SEI INVTS COM 784117103 35,313 -8,243 -18.93 2,059 -3.65 0.0101
2023-02-10 2022-12-31 13F/A-1 SEI INVTS COM 784117103 35,313 -8,243 17,458 0.0832
2023-02-09 2022-12-31 13F SEI INVTS COM 784117103 35,313 -8,243 2 0.0099
2022-11-14 2022-09-30 13F SEI INVTS COM 784117103 43,556 -7,429 -14.57 2,136 -22.44 0.0123
2022-08-04 2022-06-30 13F SEI INVTS COM 784117103 50,985 -5,888 -10.35 2,754 -19.57 0.0147
2022-05-13 2022-03-31 13F SEI INVTS COM 784117103 56,873 -15,894 -21.84 3,424 -22.78 0.0171
2022-02-10 2021-12-31 13F SEI INVTS COM 784117103 72,767 10,658 17.16 4,434 20.39 0.0186
2021-11-12 2021-09-30 13F SEI INVTS COM 784117103 62,109 25,749 70.82 3,683 63.47 0.0164
2021-08-10 2021-06-30 13F SEI INVTS COM 784117103 36,360 -1,241 -3.30 2,253 -1.66 0.0099
2021-05-13 2021-03-31 13F SEI INVTS COM 784117103 37,601 -250 -0.66 2,291 5.33 0.0112
2021-02-10 2020-12-31 13F SEI INVTS COM 784117103 37,851 611 1.64 2,175 15.14 0.0113
2020-11-12 2020-09-30 13F SEI INVTS COM 784117103 37,240 -2,760 -6.90 1,889 -14.10 0.0111
2020-08-13 2020-06-30 13F/A-1 SEI INVTS COM 784117103 40,000 -4,603 -10.32 2,199 6.39 0.0137
2020-08-13 2020-06-30 13F SEI INVTS COM 784117103 40,000 -4,603 2,199 6,657.3161
2020-05-14 2020-03-31 13F SEI INVESTMENTS COM 784117103 44,603 -596 -1.32 2,067 -30.17 0.0151
2020-02-10 2019-12-31 13F SEI INVESTMENTS COM 784117103 45,199 -1,052 -2.27 2,960 7.99 0.0179
2019-11-12 2019-09-30 13F SEI INVESTMENTS COM 784117103 46,251 -144 -0.31 2,741 5.30 0.0186
2019-07-30 2019-06-30 13F SEI INVESTMENTS COM 784117103 46,395 730 1.60 2,603 9.09 0.0179
2019-05-14 2019-03-31 13F SEI INVESTMENTS COM 784117103 45,665 -565 -1.22 2,386 11.70 0.0160
2019-02-12 2018-12-31 13F SEI INVESTMENTS COM 784117103 46,230 -15,470 -25.07 2,136 -43.34 0.0159
2018-11-13 2018-09-30 13F SEI INVESTMENTS COM 784117103 61,700 -4,572 -6.90 3,770 -9.00 0.0207
2018-08-01 2018-06-30 13F SEI INVESTMENTS COM 784117103 66,272 830 1.27 4,143 -15.48 0.0245
2018-05-14 2018-03-31 13F SEI INVESTMENTS COM 784117103 65,442 -5,248 -7.42 4,902 -3.50 0.0300
2018-02-13 2017-12-31 13F SEI INVESTMENTS COM 784117103 70,690 -8,776 -11.04 5,080 4.68 0.0288
2017-11-13 2017-09-30 13F SEI INVESTMENTS COM 784117103 79,466 730 0.93 4,853 14.59 0.0261
2017-08-07 2017-06-30 13F SEI INVESTMENTS COM 784117103 78,736 4,190 5.62 4,235 12.63 0.0237
2017-05-15 2017-03-31 13F SEI INVESTMENTS COM 784117103 74,546 -4,680 -5.91 3,760 -3.86 0.0215
2017-02-13 2016-12-31 13F SEI INVESTMENTS COM 784117103 79,226 4,118 5.48 3,911 14.12 0.0234
2016-11-14 2016-09-30 13F SEI INVESTMENTS COM 784117103 75,108 170 0.23 3,427 -4.94 0.0214
2016-08-05 2016-06-30 13F SEI INVESTMENTS COM 784117103 74,938 10,075 15.53 3,605 29.12 0.0247
2016-05-12 2016-03-31 13F SEI INVESTMENTS COM 784117103 64,863 371 0.58 2,792 -17.37 0.0208
2016-02-11 2015-12-31 13F SEI INVESTMENTS COM 784117103 64,492 -414 -0.64 3,379 7.96 0.0256
2015-11-12 2015-09-30 13F SEI INVESTMENTS COM 784117103 64,906 -2,106 -3.14 3,130 -4.75 0.0259
2015-08-06 2015-06-30 13F SEI INVESTMENTS COM 784117103 67,012 -250 -0.37 3,286 10.79 0.0232
2015-05-14 2015-03-31 13F SEI INVESTMENTS COM 784117103 67,262 67,262 0.00 2,966 0.0203
2015-02-05 2014-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 0 -53,758 -100.00 0 -100.00
2014-11-13 2014-09-30 13F SEI INVESTMENTS COM 784117103 53,758 180 0.34 1,944 10.71 0.0154
2014-08-13 2014-06-30 13F SEI INVESTMENTS COM 784117103 53,578 100 0.19 1,756 -2.28 0.0134
2014-05-14 2014-03-31 13F SEI INVESTMENTS COM 784117103 53,478 2,920 5.78 1,797 2.33 0.0146
2014-02-13 2013-12-31 13F SEI INVESTMENTS COM 784117103 50,558 1,322 2.69 1,756 15.37 0.0147
2013-11-13 2013-09-30 13F SEI INVESTMENTS COM 784117103 49,236 9,707 24.56 1,522 35.41 0.0133
2013-08-01 2013-06-30 13F SEI INVESTMENTS COM 784117103 39,529 39,529 1,124 0.0114
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.