Its newest brand provided a product range it could use to better compete against rivals McDonald's and Burger King.
Restaurant Brands is eyeing the potential to open up to 60 Carl's Jr stores in New Zealand.
Salt Funds Management managing director Matt Goodson said Forsgren and Restaurant Brands had lacked scale with Carl's Jr, so combining all the stores under a single operator was a positive development.
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"What this will allow is one party to have critical mass to spread marketing costs and get the supply chain well and truly sorted," Goodson said. "It should hopefully work very well for them."
He said Carl's Jr had the potential to become "exceptionally profitable" for Restaurant Brands once suitable scale was achieved.
Carl's Jr turned a $100,000 profit for Restaurant Brands in the first half of its financial year compared with a $200,000 loss a year earlier. Carl's Jr's half-year sales rose 34 per cent to $8.8 million.
Barry Forsgren said his family would have liked to expand Carl's Jr further in New Zealand, but Restaurant Brands' arrival on the scene had "put an end" to those plans.
Forsgren only had the rights to operate up to eight stores in this country.
"We decided it was the right time to move on to different things," said Forsgren, who also operates a Carl's Jr franchise in American Samoa.
The sale is slated for completion this month, pending the approval of US-based franchiser CKE Restaurants Holdings.
Restaurant Brands said it would offer employment to existing Forsgren employees.
Separately, Restaurant Brands has signed a master licensing agreement with CKE which will allow Restaurant Brands to sublicense Carl's Jr stores in New Zealand to third-party franchisees.
"Licensing smaller franchisees to operate the Carl's Jr brand in locations where they can operate the business effectively will allow more rapid expansion of the Carl's Jr store network," said Restaurant Brands chief executive Russel Creedy.
The company operates a similar model with its other brands, receiving a share of royalties and fees in return for the development and supervision of sublicensed stores.
Restaurant Brands shares closed up 0.69 per cent yesterday at $3.65.
- additional reporting BusinessDesk