The episode underscores internal US debate over Chinese tech scrutiny, even as the Trump administration signals a more cautious diplomatic posture ahead of a possible China visit.
The Office of the USTR said its list had for the first time included AliExpress and WeChat e-commerce sites.
The company forecast that its annual revenue would grow at the slowest pace since its stock market debut in 2014.
Alibaba Group said in a statement that they have received notification from the State Administration for Market Regulation.
The investment aims to help Alibaba Cloud partners in accelerating their digitalisation capabilities and create joint products.
The common set of 800 questions was split into five categories - Local information, commerce, navigation, information in general, and commands.
Ma argued on Monday that the purpose of trade should be to promote peace and communication rather than conflict, and that the rise of protectionism is misguided.
While remaining as executive chairman in the next 12 months, I will work closely with Daniel to ensure a smooth and successful transition: Ma
Ali Baba co-founder and Executive Chairman Jack Ma is not retiring for now and will unveil a succession strategy on Monday when he turns 54, the South China Morning Post reported on Sunday.
A former English teacher, Ma co-founded Alibaba with 17 others out of his apartment in Hangzhou, Zhejiang province, in 1999.
