SEI Investments Company
US ˙ NasdaqGS ˙ US7841171033

SecuritySEIC / SEI Investments Company
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership151,682 shares
Latest Disclosed Value $ 11,904,368
Advisor Group Holdings, Inc. reports 1.07% increase in ownership of SEIC / SEI Investments Company

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 151,682 shares of SEI Investments Company (US:SEIC) valued at $11,902,487 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 150,076 shares of SEI Investments Company. This represents a change in shares of 1.07% during the quarter. The current value of the position is $13,563,404 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)
2026-05-15 2026-03-31 13F SEI INVTS COM 784117103 151,682 1,606 1.07 11,904 -3.30 0.0101
2026-02-17 2025-12-31 13F SEI INVTS COM 784117103 150,076 5,857 4.06 12,311 -2.91 0.0180
2025-11-14 2025-09-30 13F SEI INVTS COM 784117103 144,219 4,565 3.27 12,679 1.06 0.0177
2025-09-04 2025-06-30 13F/A-1 EI INVTS COM 784117103 139,654 9,442 7.25 12,546 24.12 0.0223
2025-08-13 2025-06-30 13F EI INVTS COM 784117103 124,393 -5,819 10,282 0.0119
2025-05-12 2025-03-31 13F SEI INVTS COM 784117103 130,212 7,308 5.95 10,109 -0.29 0.0225
2025-06-06 2024-12-31 13F/A-1 SEI INVTS COM 784117103 122,904 1,985 1.64 10,137 21.17 0.0228
2025-02-07 2024-12-31 13F SEI INVTS COM 784117103 122,746 1,827 8,521 0.0217
2024-11-13 2024-09-30 13F SEI INVTS COM 784117103 120,919 510 0.42 8,367 7.41 0.0189
2024-08-13 2024-06-30 13F SEI INVTS COM 784117103 120,409 125 0.10 7,789 -9.93 0.0184
2024-05-10 2024-03-31 13F SEI INVTS COM 784117103 120,284 -4,305 -3.46 8,648 9.23 0.0193
2024-02-12 2023-12-31 13F SEI INVTS COM 784117103 124,589 -123,951 -49.87 7,918 -47.11 0.0139
2023-11-13 2023-09-30 13F SEI INVTS COM 784117103 248,540 119,708 92.92 14,970 94.91 0.0221
2023-08-21 2023-06-30 13F/A-1 SEI INVTS COM 784117103 128,832 112,943 710.83 7,681 741.18 0.0138
2023-08-10 2023-06-30 13F SEI INVTS COM 784117103 128,832 112,943 7,681 0.0021
2023-05-12 2023-03-31 13F SEI INVTS COM 784117103 15,889 -227 -1.41 913 -2.87 0.0017
2023-02-10 2022-12-31 13F SEI INVTS COM 784117103 16,116 -4,295 -21.04 941 -6.09 0.0019
2022-11-14 2022-09-30 13F SEI INVTS COM 784117103 20,411 660 3.34 1,001 -6.27 0.0023
2022-08-10 2022-06-30 13F SEI INVTS COM 784117103 19,751 4,436 28.97 1,068 29.61 0.0024
2022-05-04 2022-03-31 13F SEI INVTS COM 784117103 15,315 631 4.30 824 -7.83 0.0016
2022-02-03 2021-12-31 13F SEI INVTS COM 784117103 14,684 3,444 30.64 894 33.83 0.0017
2021-11-05 2021-09-30 13F SEI INVTS COM 784117103 11,240 930 9.02 668 4.54 0.0014
2021-08-02 2021-06-30 13F SEI INVTS COM 784117103 10,310 305 3.05 639 4.24 0.0014
2021-05-13 2021-03-31 13F SEI INVTS COM 784117103 10,005 -4,965 -33.17 613 -28.89 0.0015
2021-02-10 2020-12-31 13F SEI INVTS COM 784117103 14,970 2,931 24.35 862 39.94 0.0023
2020-11-12 2020-09-30 13F SEI INVTS COM 784117103 12,039 -512 -4.08 616 -10.47 0.0018
2020-08-14 2020-06-30 13F SEI INVTS COM 784117103 12,551 -1,515 -10.77 688 5.20 0.0023
2020-05-18 2020-03-31 13F SEI INVESTMENTS COM 784117103 14,066 14,066 654 0.0027
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.