"After a lot of soul-searching, I have decided to go back to my roots and start a new company," Verdu wrote on a Zynga Blog.
An alumnus of game giant Electronic Arts (NYSE: EA), Verdu came to Zynga in 2009. Zynga plans to invest in his new venture, which will develop new mobile games, a company representative said.
Zynga shares fell 4 cents to $3.04 in early trading. They're down nearly 70 percent from the initial public offering last December.