The Cyberspace Administration of China said today that it was carrying out reviews of Huochebang and Yunmanman, which are owned by Full Truck Alliance, and Boss Zhipin, a recruitment site owned by Kanzhun.

Kanzhun, which raised US$912 million, listed in the US in June.

Full Truck Alliance, colloquially referred to as China’s “Uber for trucks”, also listed in the US last month after taking in US$1.6 billion.

The moves extend a crackdown on US-listed Chinese tech companies by the CAC, an increasingly prominent regulator that yesterday ordered Didi to remove its app from app stores, accusing the company of serious violations of laws on collecting and using personal data.

The move casts a shadow over Didi, which listed in the US on June 30 and is heavily dependent on China for its profits.

The regulator’s action triggered a sharp sell-off in shares of Japan’s SoftBank Group, which is the biggest outside investor in Didi and also a backer of Full Truck Alliance.

Shares in SoftBank fell more than 5% this morning.

Didi is one of SoftBank’s biggest bets in China.

The Japanese tech investor poured nearly US$11 billion into the company before it went public in the US on June 30.

SoftBank’s Vision Fund has a 20.2% stake in Didi, according to filings, while the Vision Fund also held a 20.3% stake in Full Truck Alliance when it went public on June 22.

The regulator had announced a review of Didi late on Friday, sending Didi’s shares down more than 5% in New York.

They closed at US$15.53, having begun trading at US$14 on June 30.

US markets will be closed today.

Today’s decline brought SoftBank shares to their lowest level since December.

They are down about 30% from their high for the year in March.

Shares in Tencent, which backs all three companies under investigation, dropped 1.9% in Hong Kong.