Postum Foods (later Best Foods) acquired the Hellmann’s brand in 1927. At this time, Hellmann’s was not the only commercial mayo on the market. Out in California, Best Foods had a popular mayonnaise, while Hellmann’s reigned supreme west of the Rocky Mountains. Because Hellmann’s had such a devoted following, Postum Foods decided to keep both brand names. To this day, Best Foods Mayonnaise continues to sell west of the Rockies, while Hellmann’s sells to the east.