Chinese electric car maker BYD’s plan to sell shares in its computer chip making unit has been suspended, the latest share offering to be hit by Beijing’s crackdown on businesses.

The listing has been put on hold due to a regulatory investigation into the law firm advising the company, BBC reported.

The plan to list on Shenzen’s Nasdaq style market ChiNext was filed in May.

The suspension comes amid a broader regulatory tightening on industry by Chinese authorities.

Over the weekend, the Shenzen Stock Exchange said Beijing Tian Yuan Law Firm, one of China’s biggest legal services companies, was being investigated in relation to the listing.

It said the firm, which has been an advisor for BYD Semiconductor’s planned initial public offering (IPO), was being investigated by China’s Security Regulatory Commission but gave no further details.

BYD Semiconductor had aimed to raise at least $421m ($309m) from the sale of shares.

It planned to invest the money back into the business as global carmakers struggle with a shortage of computer chips

The firm is China’s biggest maker of microcontroller chips for vehicles.