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The story
Kenneth (Ken) and Carl McGowen incorporated Mac's Milk Limited in Ontario on April 4, 1962. On July 5, 1963, Silverwood Dairies Limited acquired 40% of the shares of Mac's Milk Limited, and increased its holding to 80% on March 29, 1968, and 100% on January 12, 1972.
In 1971, the company purchased 18 convenience stores operating under the "Little Z Convenience Stores" banner from Zehrs Markets. In 1974, it bought thirteen Mini-Mart convenience stores in Vancouver from a subsidiary of George Weston Limited and seven Starlite Variety Stores operating in Windsor, Ontario.
The company was renamed "Mac's Convenience Stores Limited" on May 7, 1975. In 1976, Silverwood Dairies Limited purchased shares of Royal Oak Dairy, including operations of convenience stores under the Bantam and Astro names.
In 1994, the company sold most of the Mac's stores in Quebec to Alimentation Couche-Tard Ltd. Mac's stores in Quebec were renamed "Dépan-Escompte Couche-Tard". Silcorp, the parent company of Mac's, acquired 163 Southern Ontario stores, and assets of rival Becker's in November 1996. On April 14, 1999, Alimentation Couche-Tard Inc. purchased Silcorp (including the Mac's and Becker's chains). Mac's dropped its longtime cat logo, and replaced it with Couche-Tard's owl logo.
On September 23, 2015, Alimentation Couche-Tard announced that as part of a global re-branding, all Mac's stores would be converted to Couche-Tard's Circle K banner; the Canadian renaming began in May 2017.
From Wikipedia’s article on Mac's, shared under CC BY-SA 4.0.5