SEI Investments Company
US ˙ NasdaqGS ˙ US7841171033

SecuritySEIC / SEI Investments Company
InstitutionNatixis
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Natixis closes position in SEIC / SEI Investments Company

On May 14, 2026 - Natixis filed a 13F-HR form disclosing ownership of 0 shares of SEI Investments Company (US:SEIC) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 76 shares of SEI Investments Company. The current value of the position is $0 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 0 -100.00 0
2026-02-13 2025-12-31 13F SEI INVTS COM 784117103 76 -126 -62.38 6 -64.71 0.0000
2025-11-14 2025-09-30 13F SEI INVTS COM 784117103 202 -80 -28.37 17 -32.00 0.0001
2025-08-13 2025-06-30 13F SEI INVTS COM 784117103 282 -314 -52.68 25 -44.44 0.0001
2025-07-18 2025-03-31 13F/A-1 SEI INVTS COM 784117103 596 -15,152 -96.22 46 -96.53 0.0002
2025-05-14 2025-03-31 13F SEI INVTS COM 784117103 596 -15,152 46 0.0003
2025-02-13 2024-12-31 13F SEI INVTS COM 784117103 15,748 -3,541 -18.36 1,299 -2.70 0.0079
2024-11-13 2024-09-30 13F SEI INVTS COM 784117103 19,289 -26,911 -58.25 1,335 -55.35 0.0075
2024-08-13 2024-06-30 13F SEI INVTS COM 784117103 46,200 0 0.00 2,989 -10.03 0.0171
2024-05-13 2024-03-31 13F SEI INVTS COM 784117103 46,200 34,608 298.55 3,322 351.22 0.0173
2024-02-13 2023-12-31 13F SEI INVTS COM 784117103 11,592 -6,823 -37.05 737 -33.63 0.0054
2023-11-14 2023-09-30 13F SEI INVTS COM 784117103 18,415 18,112 5,977.56 1,109 6,061.11 0.0085
2023-08-11 2023-06-30 13F SEI INVTS COM 784117103 303 -59,197 -99.49 18 -99.47 0.0001
2023-05-12 2023-03-31 13F SEI INVTS COM 784117103 59,500 -8,646 -12.69 3,424 -13.80 0.0309
2023-02-24 2022-12-31 13F/A-1 SEI INVTS COM 784117103 68,146 25,946 61.48 3,973 91.88 0.0223
2023-02-13 2022-12-31 13F SEI Investments COM 784117103 34,100 -8,100 1,988 0.0000
2022-11-14 2022-09-30 13F SEI Investments COM 784117103 42,200 0 0.00 2,070 -9.21 0.0097
2022-08-12 2022-06-30 13F SEI Investments COM 784117103 42,200 33,003 358.85 2,280 311.55 0.0083
2022-05-13 2022-03-31 13F SEI INVTS COM 784117103 9,197 -23,985 -72.28 554 -72.60 0.0019
2022-02-14 2021-12-31 13F SEI INVTS COM 784117103 33,182 33,182 2,022 0.0069
2021-08-13 2021-06-30 13F SEI INVTS CO 784117103 0 -29,528 -100.00 0 -100.00
2021-05-14 2021-03-31 13F SEI INVTS CO 784117103 29,528 3,347 12.78 1,799 19.53 0.0059
2021-02-12 2020-12-31 13F SEI INVTS COM 784117103 26,181 -9,312 -26.24 1,505 -16.39 0.0055
2020-11-12 2020-09-30 13F SEI INVTS COM 784117103 35,493 -36,814 -50.91 1,800 -54.72 0.0133
2020-08-13 2020-06-30 13F SEI INVTS COM 784117103 72,307 -37,338 -34.05 3,975 -35.38 0.0309
2019-08-13 2019-06-30 13F SEI INVESTMENTS COM 784117103 109,645 47,258 75.75 6,151 89.44 0.0486
2019-05-15 2019-03-31 13F SEI INVESTMENTS COM 784117103 62,387 -77,484 -55.40 3,247 -49.75 0.0204
2019-02-14 2018-12-31 13F/A-1 SEI INVESTMENTS COM 784117103 139,871 -715 -0.51 6,462 -24.77 0.0532
2019-02-14 2018-12-31 13F SEI INVESTMENTS COM 784117103 139,871 -715 6,462
2018-11-14 2018-09-30 13F SEI INVESTMENTS COM 784117103 140,586 -21,473 -13.25 8,590 -15.22 0.0497
2018-08-14 2018-06-30 13F SEI INVESTMENTS COM 784117103 162,059 -123,491 -43.25 10,132 -52.63 0.0536
2018-05-15 2018-03-31 13F SEI INVESTMENTS COM 784117103 285,550 280,500 5,554.46 21,391 5,792.84 0.1313
2018-02-14 2017-12-31 13F SEI INVESTMENTS COM 784117103 5,050 -4,551 -47.40 363 -38.05 0.0028
2017-11-14 2017-09-30 13F SEI INVESTMENTS COM 784117103 9,601 -230 -2.34 586 10.78 0.0054
2017-08-14 2017-06-30 13F SEI INVESTMENTS COM 784117103 9,831 1,255 14.63 529 22.17 0.0060
2017-05-15 2017-03-31 13F SEI INVESTMENTS COM 784117103 8,576 3,403 65.78 433 69.80 0.0054
2017-02-14 2016-12-31 13F SEI INVESTMENTS COM 784117103 5,173 -62,123 -92.31 255 -91.69 0.0026
2016-11-14 2016-09-30 13F SEI INVESTMENTS COM 784117103 67,296 67,296 0.00 3,069 0.0355
2014-11-14 2014-09-30 13F SEI INVESTMENTS COM 784117103 0 -14,000 -100.00 0 -100.00
2014-08-14 2014-06-30 13F SEI INVESTMENTS COM 784117103 14,000 -28,000 -66.67 459 -67.49 0.0055
2014-05-14 2014-03-31 13F SEI INVESTMENTS COM 784117103 42,000 0 0.00 1,412 -3.22 0.0184
2014-02-14 2013-12-31 13F SEI INVESTMENTS COM 784117103 42,000 42,000 1,459 0.0125
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.