Morgan Stanley introduces a new portfolio for investors associated with the most prominent sports leagues.

The investment bank’s asset management division announced Thursday the launch of what it calls the Parametric Custom Core Sports League strategy. Targeted at wealthy sports fans, the portfolio will allow them to invest in a composite index of companies with strong sponsorship, media and advertising ties to the most prominent sports leagues.

A minimum investment of $250,000 is required to participate.

Sports has proven to be an attractive and growing asset class as valuations have skyrocketed over the past decade. That has made those still on the sidelines want to get involved. But for most Americans, owning a professional sports team is financially out of reach. Morgan Stanley hopes to change that.

The idea for the new offering came when a Morgan Stanley client asked the bank to design a portfolio consisting of companies that support a specific sport.

“We saw there was a bigger opportunity to do something here,” said Sandra Richards, managing director and head of Morgan Stanley’s Global Sports and Entertainment Division. “This one person represents many, and multiples of many, who want to invest in sports as a fan who wants to get engaged.”

The investments in the portfolio are selected from large-cap US stocks and will consist of between 250 and 400 securities of companies you may encounter on the sidelines, in the tickers or among the advertisers of major sporting events.

Morgan Stanley says the portfolio will mimic the risk characteristics of the portfolio S&P500.

The bank, which has $516 billion in assets under management, will use Nielsen Sports as a data source to track the activities, spending and visibility of the companies with exposure to professional sports leagues.

“We are seeing demand from our customers asking for ways to invest in sports,” Richards said. “And it will continue.”