The Commerce Commission has granted clearance for Heinz Wattie's to purchase food and coffee business Cerebos Gregg's - subject to divestment undertaking.
The divestment will include licenses for the supply of tomato sauce and ketchup, barbecue and steak sauce, as well as the F. Whitlock & Sons brand for the supply of Worcestershire sauce in New Zealand.
In November, the US company applied to takeover the company when the brand's manufacturer put it on the market in April.
The Commerce Commission said its ruling was based on competition issues in the national markets for the manufacture, importation and wholesale supply of a number of table sauces to supermarkets and the food service industry.
"We believe the merger of the number one and two wholesale suppliers to supermarkets of red sauce, barbecue sauce, steak sauce and Worcestershire sauce would be likely to result in a substantial lessening of competition in each of these markets," Commission chair Dr Mark Berry said.