SEI’s growth is getting harder to dismiss
- Q1 2026 revenue rose 13%, and diluted EPS rose 20% to $1.40.
- Investment Managers had its best quarter in company history, helped by large alternative-asset mandates.
- Private Banks margin improved to 21% from 17%, a key proof point for the margin story.
- Investment Advisors grew 24%, helped by $19.0 million of Stratos revenue.
- The main debate is duration: SEI must prove this is a new base, not two strong quarters in a row.
Two strong quarters change the debate
SEI’s latest quarter made the bull case more believable. Revenue was $622.2 million, up 13% year over year. Diluted EPS was $1.40, up 20%. This followed a record Q4 2025, so the better results now look less like a one-time spike.
The strongest evidence is in the segments. Investment Managers revenue rose 15% and held a 39% operating margin. Private Banks revenue rose 11%, while its operating margin climbed to 21% from 17%. Investment Advisors revenue rose 24%, helped by $19.0 million from Stratos.
The bull case says SEI is turning years of platform spending into higher profit. It is also returning cash to shareholders, including $208.3 million of buybacks in Q1 2026. That mix of growth, margin gains, and capital return is attractive.
The bear case has not disappeared. The valuation is not a free pass, and sentiment is still mixed. Bears now need to argue that two strong quarters will fade, that large deals are lumpy, or that Stratos is adding revenue without enough organic growth behind it.
Platforms, fees, and operating leverage
SEI makes money by running financial technology and operations for other financial firms. Some fees are fixed monthly fees for contracted services. Other fees are based on client assets that SEI manages, advises, administers, or processes.
That model can scale well. Once a platform is built, adding more client assets or more services can lift profit faster than revenue. Q1 2026 showed that effect in Private Banks, where revenue rose 11% and operating profit rose 40%.
The model can break when clients leave, renegotiate lower fees, or delay large deals. SEI also has market exposure because asset-based fees rise and fall with markets and client flows. The Institutional Investors segment faces a slower long-term backdrop because defined benefit pension plans continue to shrink.
Stratos adds a new path. SEI now has a larger link to independent advisers, a group that serves clients outside big banks and wirehouses. The open question is how much of the Adviser segment growth is organic after stripping out the $19.0 million first-quarter Stratos contribution.
Where SEI sells
Investment Manager Services
This business serves traditional and alternative fund managers with administration, operations, and technology. Q1 2026 revenue rose 15%, and the segment held a 39% operating margin.
Private Banking platforms
SEI provides technology and operations for banks and wealth firms, including the SEI Wealth Platform. The key proof point is margin, which rose to 21% in Q1 2026 from 17% a year earlier.
Investment Advisors platform
This segment gives advisers technology, operations, and investment products such as separately managed accounts and ETFs. Stratos pushed Q1 2026 revenue higher, but organic growth is still the key question.
Institutional Investors
SEI offers outsourced chief investment officer services, meaning it can manage or advise on an institution’s investment program. Growth is slower because some pension clients are shrinking or ending plans.
LSV partnership
SEI owns a minority stake in LSV Asset Management. SEI’s share of LSV earnings was $32.1 million in Q1 2026, helped by market appreciation.
New businesses
This small group includes newer efforts such as private wealth management. Revenue fell in Q1 2026 after the Family Office Services business was divested in June 2025.
Revenue mix in Q1 2026
Segment shares use reported revenue for the three months ended March 31, 2026. Investment Managers, Investment Advisors, and Private Banks together made up most of revenue, so large client wins or delays in those areas matter.
What could break the thesis
Private Banks margin slips back
High impact · Medium oddsPrivate Banks margin rose to 21% from 17%, which is central to the bull case. If new work needs more staff, vendor spending, or custom services than expected, that margin can fade. A drop would weaken the idea that SEI has reached a higher profit base.
Stratos growth is mostly acquired, not organic
Medium impact · Medium oddsInvestment Advisors revenue rose 24%, but Stratos added $19.0 million of revenue in Q1 2026. That makes the headline growth harder to read. SEI needs to show that adviser demand is growing beyond the first acquired revenue.
Large deals stay lumpy
Medium impact · High oddsInvestment Managers had its best quarter in company history, helped by major enterprise mandates from two of the world’s largest alternative asset managers. These deals can be large but uneven. A quiet sales period could make growth look choppy even if the long-term demand for outsourcing remains healthy.
Fee pressure eats the model
High impact · Medium oddsSEI competes in asset management, custody, fund administration, and wealth technology. Clients can push for lower prices, especially when contracts renew. The 10-Q also cites fee reductions in separately managed account programs and lower fee structures in SEI fund programs.
Regulation and operations cost more
Medium impact · Medium oddsSEI runs regulated subsidiaries in several markets and serves regulated clients. The company cites reviews and examinations by regulators including the SEC, FINRA, the FCA, the CBI, and others. More remediation, fines, or process changes could lift costs and slow new product work.
Institutional headwinds persist
Low impact · High oddsInstitutional Investors still earns high margins, but the market is not as strong as the other growth engines. Defined benefit pension plans are in long-term decline, and SEI cited client losses as an offset to revenue growth. This is not the largest segment, but it can hold back total growth.
In one breath
What does SEI Investments actually do?
SEI provides financial technology, operations outsourcing, and investment management. Its clients include fund managers, banks, advisers, and institutions that would rather buy a platform or service than build it all themselves.
Why did SEI buy into Stratos?
Stratos gives SEI a bigger position with independent financial advisers. In Q1 2026, Stratos added $19.0 million of revenue, but investors still need to see how much growth comes from new demand rather than the acquisition itself.
Is SEI mainly an asset manager or a software company?
It is both, but the model is broader than either label. SEI earns asset-based fees, processing fees, and software servicing fees, which makes it a mix of wealth technology, fund operations, and investment management.
What is the biggest thing to watch next?
Watch margins and sales events. If Private Banks can hold around 21% margin and Investment Managers keeps winning large recurring deals, the bull case gets stronger.