Chinese financial watchdogs on Thursday summoned 13 internet platforms engaged in finance business, including heavyweights Tencent (0700.HK) and ByteDance, to order them to strengthen compliance with regulations, the central bank said.

The move by the four regulators is part of widening efforts by Beijing to rein in the country's massive internet "platform economy," which includes an ongoing antitrust clampdown backed by President Xi Jinping. read more

The country's platform economy has grown rapidly and covers whole range of e-commmerce activities ranging from banking to shopping and food delivery.

"Internet platforms have played an important role in improving the efficiency of financial services and broadening the access of financial services to more people," the People's Bank of China said in a statement.

"At the same time, some financial services were running without licences, and there are serious rule violations in areas such as regulatory arbitrage, unfair competition and damaging consumers' interests," it said.

The companies will have to set up financial holding companies if they meet requirements to do so, as Alibaba's fintech affiliate Ant Group was recently forced to do, a move that tightens capital requirements.

They should also draft "business rectification" plans to comply with regulations, cut "improper" links between their payment tools and other financial products, break "monopolies" in holding data, and prevent risks in internet mutual aid businesses.

They should be more compliant with their issuance of asset-backed securities, and overseas listings, the central bank said in a statement following the meeting between regulators and the companies.

Tencent and ByteDance did not immediately respond to requests for comment.

Other companies targeted by regulators on Thursday include Du Xiaoman Financial , which is backed by Baidu Inc , as well as Meituan, Ping An-backed Lufax , 360 DigiTech ,, Xiaomi Corp and's JD Digits.

None of these companies immediately responded to requests for comment.

Alibaba and Ant, the original targets of China's squeeze on what was until recently a loosely regulated internet economy, were not among those named by regulators on Thursday.

Beijing's crackdown on fintech was triggered by an October speech by Alibaba founder Jack Ma criticising the country's regulatory system, which led to the scuppering of Ant's record $37 billion initial public offering that continues to reverberate.

"Tighter supervision is not only aimed at the Ant Group, and the problems of the Ant Group are definitely not an exception," the state-run China News Service wrote in a Thursday commentary.

"Many platform companies have irregularities to varying degrees behind their rapid expansion over the years."

Earlier this month, China's antitrust watchdog called in nearly three dozen internet companies to warn them to stop using any banned practices, such as forcing vendors to use their platform exclusively. read more