SEI Investments Company
MX ˙ BMV ˙ US7841171033
SecurityMX:SEIC / SEI Investments Company
InstitutionGAMMA Investing LLC
Latest Disclosed Ownership7,388 shares
Latest Disclosed Value $ 579,736
GAMMA Investing LLC reports 1.76% increase in ownership of SEIC / SEI Investments Company

On April 6, 2026 - GAMMA Investing LLC filed a 13F-HR form disclosing ownership of 7,388 shares of SEI Investments Company (MX:SEIC) valued at $579,736 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 5, 2026 disclosing 7,260 shares of SEI Investments Company. This represents a change in shares of 1.76% 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)
2026-04-06 2026-03-31 13F SEI INVTS CO COM Common Stock 784117103 7,388 128 1.76 580 -2.69 0.0271
2026-01-05 2025-12-31 13F SEI INVTS CO COM Common Stock 784117103 7,260 164 2.31 595 -1.16 0.0299
2025-10-02 2025-09-30 13F SEI INVTS CO COM Common Stock 784117103 7,096 367 5.45 602 -0.33 0.0332
2025-07-14 2025-06-30 13F SEI INVTS CO COM Common Stock 784117103 6,729 668 11.02 605 28.51 0.0382
2025-04-15 2025-03-31 13F/A-1 SEI INVTS CO COM Common Stock 784117103 6,061 1,192 24.48 471 17.21 0.0353
2025-04-07 2025-03-31 13F SEI INVTS CO COM Common Stock 784117103 470,515 465,646 6 0.0323
2025-01-03 2024-12-31 13F SEI INVTS CO COM Common Stock 784117103 4,869 1,509 44.91 402 72.84 0.0342
2024-10-04 2024-09-30 13F SEI INVTS CO COM Common Stock 784117103 3,360 1,240 232 0.0230
2024-10-07 2024-09-30 13F SEI INVTS CO COM Common Stock 784117103 3,360 1,240 58.49 232 69.34 0.0230
2024-07-02 2024-06-30 13F SEI INVTS CO COM Common Stock 784117103 2,120 624 41.71 137 28.04 0.0187
2024-04-05 2024-03-31 13F SEI INVTS CO COM Common Stock 784117103 1,496 257 20.74 108 37.18 0.0219
2024-02-01 2023-12-31 13F SEI INVTS CO COM Common Stock 784117103 1,239 1,239 78 0.0212
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.