SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionQuantinno Capital Management LP
Latest Disclosed Ownership382,361 shares
Latest Disclosed Value $ 30,003,885
Quantinno Capital Management LP reports 265.58% increase in ownership of SEIC / SEI Investments Company

On May 15, 2026 - Quantinno Capital Management LP filed a 13F-HR form disclosing ownership of 382,361 shares of SEI Investments Company (MX:SEIC) valued at $30,003,885 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 104,590 shares of SEI Investments Company. This represents a change in shares of 265.58% 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)
2026-05-15 2026-03-31 13F SEI INVTS COM 784117103 382,361 277,771 265.58 30,004 249.77 0.0501
2026-02-17 2025-12-31 13F SEI INVTS COM 784117103 104,590 -47,330 -31.15 8,579 -33.45 0.0172
2025-11-14 2025-09-30 13F SEI INVTS COM 784117103 151,920 48,914 47.49 12,890 39.26 0.0352
2025-08-14 2025-06-30 13F SEI INVTS COM 784117103 103,006 57,063 124.20 9,256 159.56 0.0400
2025-05-12 2025-03-31 13F SEI INVTS COM 784117103 45,943 17,987 64.34 3,567 54.71 0.0232
2025-02-14 2024-12-31 13F SEI INVTS COM 784117103 27,956 10,365 58.92 2,306 89.40 0.0227
2024-11-14 2024-09-30 13F SEI INVTS COM 784117103 17,591 6,364 56.68 1,217 67.63 0.0158
2024-08-14 2024-06-30 13F SEI INVTS COM 784117103 11,227 -4,617 -29.14 726 -36.26 0.0131
2024-05-14 2024-03-31 13F SEI INVTS COM 784117103 15,844 9,461 148.22 1,139 180.54 0.0248
2024-02-14 2023-12-31 13F SEI INVTS COM 784117103 6,383 -14,590 -69.57 406 -67.85 0.0142
2023-11-14 2023-09-30 13F SEI INVTS COM 784117103 20,973 16,768 398.76 1,263 403.19 0.0575
2023-08-04 2023-06-30 13F SEI INVTS COM 784117103 4,205 4,205 251 0.0143
2020-08-14 2020-06-30 13F SEI INVESTMENTS COM 784117103 0 -8,768 -100.00 0 -100.00
2020-05-15 2020-03-31 13F SEI INVESTMENTS COM 784117103 8,768 4,360 98.91 406 40.48 0.2535
2020-02-14 2019-12-31 13F SEI INVESTMENTS COM 784117103 4,408 -5,666 -56.24 289 -51.59 0.1819
2019-11-14 2019-09-30 13F SEI INVESTMENTS COM 784117103 10,074 0 0.00 597 5.66 0.4021
2019-08-14 2019-06-30 13F SEI INVESTMENTS COM 784117103 10,074 784 8.44 565 16.49 0.3316
2019-05-14 2019-03-31 13F SEI INVESTMENTS COM 784117103 9,290 436 4.92 485 18.58 0.3107
2019-02-14 2018-12-31 13F SEI INVESTMENTS COM 784117103 8,854 8,854 409 0.3331
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.