Kellogg officially split into tw𝔍o distinct, publicly traded companies, and shares of both tumbled on Monday in their first trading session since the separation.

Kellanova (K), which kept the old Kellogg trading symbol “K,” is the home of the company’s global snacking, international cereal a🃏nd noodles, and North America frozen foods products, including Prin💯gles and Pop-Tarts. WK Kellogg () houses the traditional Kellogg cereal brands, such as Corn Flakes and Fruit Loops. It trades under the symbol “KLG.”

Kellanova noted that the separation was achieved through the distribution of all WK Kellogg shares to Kellanova investors as of 12:01 a.m. ET October 2. Kellanova shareholders received one share of WK Kellogg stock for every four shares of Kellanova they owned as of Septe💎mber 21.

Kellanova CEO Steve Cahillane said with the split, Kellanova “has entered a new era with a new name and a new ambition.” He had argued last month when the board approved the move that the separation “will produce two stronger companies and create substantial value for shareowners."

WK Kellogg explained that as a standalone company, it is “focused on winning in cereal.” Gary Pilnick, the former vice chair of corporate develoℱpment and chief legal officer at Kellogg, is its CEO.

Even before the breakup, shares of Kellogg were trading near their lows for the year.