"We only used Heinz in the Minneapolis and Pittsburgh markets in the U.S," said Becca Hary, McDonalds' director of global media relations. "Globally, Heinz represents a small percentage of McDonald's condiment and sauce business."
Hary pledged "a smooth and orderly transition" over time to new ketchup suppliers in those cities.
A senior official with Heinz said the company had "virtually no business" with McDonald's.
McDonald's messes with its dollar menu
The condiment change appears unrelated to other shuffles at the fast food giant. It is adjusting the famed Dollar Menu, including adding pricier options. McDonald's reported this month that sales grew only slightly in the past year.
Bernardo Hees, the new Heinz chief, led Burger King through a menu redesign of its own.