Understand any stock in simple English
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SEI provides the software, investment processing, and asset management services that banks, wealth managers, and institutional investors use to run their money businesses.
SEI Investments is a behind-the-scenes company for the money business. Banks, wealth managers, fund companies, and pension funds use SEI to handle the boring but essential plumbing of finance: keeping track of investments, processing transactions, and managing the technology that runs their operations. If you have a brokerage account or a 401(k), there is a decent chance SEI software sits somewhere in the background, quietly recording what you own.
The company makes money in a few connected ways. It sells investment processing and software services — essentially outsourcing the back office so a bank doesn't have to build it itself — and it earns fees based on assets and accounts it administers. It also runs an asset management arm that manages money for institutions and wealthy individuals, plus a segment that provides investment advice and platforms to advisors. Customers stick around because ripping out the systems that track every holding and transaction is painful and risky, which gives SEI recurring, dependable revenue. SEI is headquartered in Oaks, Pennsylvania, a suburb of Philadelphia, and it has been around since 1968 — founded by Alfred West, who is still CEO. One of the more unusual things about SEI is its culture: it operates with a flat structure and small teams rather than a traditional hierarchy, an approach West has championed for decades. The company has grown steadily by buying smaller technology and advice businesses and folding them into its platform.
In 1968, a man named Al West started a tiny company with a big idea: instead of teaching bank loan officers from a textbook, why not let them practice on a computer? His program simulated a lending environment, so bankers could make mistakes safely before making them with real money. It was one of the first computer-based credit simulators, and it planted the seed for everything that followed.
Training bankers was a nice business, but the next move was bigger. During the 1970s, SEI built an automated accounting system for bank trust departments, and that system grew into TRUST 3000, a platform banks used to track trust accounts and process investments. The company had found its real calling: not teaching finance, but running the plumbing behind it.
SEI became a public company in 1981. What made investors pay attention was not a one-time product sale but recurring revenue, the kind of money that comes back again and again from customers who depend on your system. That steady model became a signature of the business.
In 1989, SEI started helping banks run their own mutual funds, handling the accounting and the distribution. Sounds dull, but it was the beginning of today's investment managers business. Banks wanted to offer funds but did not want to build the back office themselves, so SEI did it for them.
A few years later, SEI launched a business for independent investment advisors and built them a Turnkey Asset Management Platform, or TAMP. In plain terms: a ready-made toolbox that let a small advisor focus on clients while SEI handled the machinery behind the scenes.
In 1994, SEI put one million dollars into a new asset manager called LSV. It looked like a small side bet at the time. It turned out to be one of the great ones, eventually throwing off millions of dollars of profit every week for the bottom line.
In 2007, SEI launched its Wealth Platform in the U.K. It was a long, expensive build, the kind of project that tests a company's patience. But it became SEI's custody platform and the clearest example of its build-it-yourself philosophy rather than buying someone else's.
SEI acquired Archway Technology Partners in 2017, pushing deeper into the family office world, where wealthy families need sophisticated tools to track their money. It was a natural extension of the same idea: own the software that sits under the money.
For more than half a century, Al West was the only CEO SEI had ever known. In 2022, Ryan Hicke took over, the first person to succeed the founder. A company learning to run without its founder is always a test.
Also in 2022, SEI launched its first ETFs, four large-cap, factor-based strategies aimed at goals-based wealth management. It also aligned its asset management businesses globally, essentially getting its house in order for a new chapter of growth.
In 2025, SEI paid 441 million dollars for a 57.5 percent stake in Ohio-based Stratos Wealth Holdings. The prize was reach: Stratos brought hundreds of advisors and tens of billions in client assets across many states, plugging SEI straight into the advisor world it had been serving from the sidelines.
By late 2026, the numbers told the story: about 606 billion dollars in assets under management, and more than two trillion dollars in total assets managed, advised, administered, or reported. Revenue was up sharply, and sales had already beaten any full year in the company's history, a fitting scorecard for a simulator that grew into a giant.
The business is a steady fee machine rather than a thrill ride. Because much of its revenue is tied to assets under management and administration, it benefits when markets rise and gets squeezed when they fall. Competition comes from big custody banks, other financial software providers, and advisors building their own tools, but SEI's long relationships and switching costs are its main shield. It throws off solid free cash flow, which it uses to fund acquisitions, pay dividends, and buy back shares — a quiet, profitable toll collector on other people's money.
Saved answer · last researched 20 Oct 2026