Not everyone wants to invest in Mohamed Sanu. In fact, many football fans may not have even heard of Mohamed Sanu. Today, the platform announced it has entered into deals with two more players: Tennessee Titans wide receiver Kendall Wright and Indianapolis Colts lineman Jack Mewhort.

This brings its stable to eight. Here's how it all works: Fantex must then sell enough shares in the IPO to make the amount it needs to pay the athlete.

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If it fails to sell enough, it will not complete the offering. The pay check it offers each athlete varies: The stocks, meanwhile, are non-traditional "tracking" stocks, with the price meant to reflect the current perceived success of the athlete, and Fantex holds all the power in the arrangement.

When you buy a share, what you're actually buying is a share in Fantex, the company. There isn't enough volatility for it to be particularly interesting yet.

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Think of it as akin to being a "shareholder" in the Green Bay Packers. As an investment, the concept has been met with ridicule in some places.

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Many Wall Street traders think it's stupid, and risky. Fantex was supposed to debut with Arian Foster as the first stock, but he got injured just before his IPO, and the company delayed it and still hasn't gone ahead—it showed the inherent risk in the entire concept before the platform even launched. Felix Salmon, writing at Reuters in when Fantex was first shopping around the concept, labeled it "bad investment of the day.

For stars with established fame and endorsement deals, it wouldn't make sense to promise Fantex any percentage of their future earnings; they don't need the money Fantex would pay them.

But for rising stars, or those who don't yet have any off-the-field deals, it might be appealing.

The two new athletes, Kendall Wright and Jack Mewhort, are two such names. Though the two of them are small names, they represent the continued growth of Fantex's portfolio, and their signing shows that the concept is gaining traction in the NFL.

Fantex has yet to sign any athletes from other sports, but says it will; CEO Buck French also told Fortune last year that he plans to go beyond sports, to sign actors and other celebrities. Fox baseball columnist Ken Rosenthal, in a piece last week about Cleveland Indians pitcher Corey Kluber's ongoing contract talks, even suggests Kluber should sign with Fantex as a loss-of-value policy, a form of insurance for his future.

The four stocks currently trading on the site all reflect the recent fortunes of the athlete on the field, which means that in one sense, the concept is working as it's intended. Louis Rams tackle Michael Brockers will be the next stock to go public. The company isn't quite there yet, but it's still chugging along, and as it continues to sign new clients, it is likely converting many skeptics. Ivanka Trump Ivanka Trump and Marco Rubio Had Some Fun With Their Failed Hug.

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