The tennis champion, who owns Cromlix House Hotel in Scotland, has invested an undisclosed amount into the 24-strong chain, which has already exceeded its £750k target.
Tossed, founded by Vincent McKevitt, is hoping to spread the message that 'healthy food isn't boring' and use the investment to help it expand further, both in the UK and abroad.
Murray has also invested in ASOS-backed Trillenium and Mark Pearson's Fuel Ventures Fund and plans to make further investments, according to Seedrs.
He said: “I’m excited to be investing in these driven entrepreneurs and their businesses on Seedrs. It’s important to me that I back people who I believe have the same dedication, hunger and professional standards as myself and always strive to be their best.
“The three businesses I’ve chosen to kick off my crowdfunding investment portfolio are all in areas of industry I find interesting. Healthy eating is something I have to be passionate about as a sportsman, so Tossed was immediately one to consider, and the other two businesses are really pushing the boundaries of technology.
"I’m hoping that I can learn something from how they are edging ahead of the competition and take that vision onto the court with me. I’m looking forward to seeing what the future holds for these businesses and continuing to work closely with Seedrs.”
Murray was the first major public figure to team up with an equity crowdfunding platform in this way. The Seedrs strategic partnership adds to Murray’s off court interests, which also include his management company, 77, and his hotel in Dunblane, which is run by Inverlochy Castle Management International.
Jeff Lynn, CEO and co-founder of Seedrs, said, "The fact he has decided to make multiple investments in hungry entrepreneurs shows his commitment to building a dynamic portfolio of early-stage businesses. Andy has already brought a lot of value to the Seedrs Advisory Board over the past few months and we welcome his continued support.”