Baidu American Depositary Shares fell 8.4% after hours as investors scrutinized the results.
The Chinese search and Internet giant posted quarterly revenue of $3.59 billion, and a net loss attributable to shareholders of $47.5 million.
In a press release, Baidu's CFO Herman Yu warned of a difficult environment for its online marketing business.
"Despite government policies to improve the market condition for SMEs, we anticipate online marketing in the near term to face a challenging environment. We will take this opportunity to improve our monetization capabilities and review our businesses for operational efficiency, while recognizing the importance to invest for sustainable long-term growth."
Baidu also announced that a longtime SVP of search, Hailong Xiang, has resigned after 14 years at the firm. Replacing Xiang is Dou Shen, previously VP of mobile products.
The company set plans for a $1 billion share buyback program as well.