Kirkland & Ellis is advising the chairman and CEO of Qihoo 360 Technology Co. Ltd. and a consortium of private equity investors in a $9 billion bid to take the NYSE-listed Chinese Internet security company private.

The offer of $77 per American depositary share would make Qihoo’s delisting the largest such transaction by a U.S.-listed Chinese company, overtaking Focus Media and its $3.7 billion going-private deal in 2012. The company’s shares closed at $70.15 on Wednesday.