Zynga lost two more top-level executives Thursday as vice presidents Bill Mooney and Brian Birtwistle became the latest to leave the gaming company.
Mooney, a vice president of studios, and Birtwistle, a vice president of marketing, resigned this week, Bloomberg reported, citing unnamed sources.
This month, a string of managers have left as the company's share price erodes the value of equity used to compensate staff.
Zynga, which developed social games like "FarmVille" and "Mafia Wars," had a "voluntary attrition rate was around one percent for the first four years," spokeswoman Dani Dudeck said in a statement to TheWrap.
The company went public in December.
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"Our current attrition levels are not only below what we expected and modeled in our post-IPO planning, they continue to stay well below the industry average," she said.
Two days ago, Chief Creative Officer Mike Verdu resigned to start a new company.
Earlier this month, Chief Operating Officer John Schappert resigned after CEO Mark Pincus stripped him of most of his power as the company attempted an overhaul in response to declining stock prices.
Four other managers also departed recently, including Alan Patmore, the general manager of "CityVille," Erik Bethke, a general manager who oversaw "Mafia Wars 2," Ya-Bing Chu, a vice president in Zynga's mobile division, and Jeremy Strauser, another general manager.
Shares in Zynga were down 2.3 percent, or 7 cents, to $2.89 on Thursday. On Wednesday, the company's share price closed down 70 percent from its initial public offering.