Some American Internet companies may be unpopular with investors these days, but a Chinese one is finding plenty of takers.

The Alibaba Group, a Chinese e-commerce giant, is close to completing a more than $8 billion round of financing that will value it at as much as $43 billion in equity, according to two people briefed on the matter. Alibaba plans to use the bulk of that new money to buy back a 20 percent stake in itself from Yahoo for $7.1 billion. Yahoo owns 40 percent of Alibaba.