From e-commerce to ride-hailing, Chinese firms have been battered recently as regulators tighten the leash on tech corporations, citing national security and antitrust concerns.

On Friday, major names including Alibaba, Tencent, ByteDance and Pinduoduo were among more than 20 firms summoned to a meeting with a department of the Ministry of Industry and Information Technology (MIIT).

"It is necessary to conduct deep self-examination," officials told the gathered corporations, according to a statement released afterwards.

The firms should scrutinise their approach to user rights infringement, data security threats as well as violations of resource management regulations, the ministry said.

"Major internet platform companies must serve as an example, be a builder of good market order, and create an open, inclusive and fair competitive environment," according to minutes from the meeting, detailed in the MIIT statement.

Just two days earlier, Alibaba and Tencent, along with 10 other businesses, were asked by the Internet Society of China to step up data security protection.

Meituan, Xiaomi and ByteDance were also called to both meetings.

The orders come a week after the MIIT launched a six-month campaign to clamp down on illegal web activity, days later ordering Tencent and 13 other developers to tackle pop-up windows on their platforms.

China has recently launched probes into major companies and unveiled sweeping new regulations for a range of industries, rattling global markets and causing Chinese companies to reconsider overseas listing plans.

A politburo meeting on Friday stressed the need to "improve the regulatory system for the overseas listing of enterprises".

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