(Bloomberg) -- Meituan, ByteDance Ltd. and JD.com Inc. were among 12 Chinese tech giants that issued pledges to obey antitrust laws, a day after Beijing gave the companies a month to conduct internal reviews and comply with government guidelines.Pinduoduo Inc., Baidu Inc. and Sina Weibo were also among firms that published their commitments in a statement on the website of State Administration For Market Regulation. The antitrust watchdog had summoned 34 companies to a meeting on Tuesday, ordering them to rectify their excesses and issue pledges to operate legally.Other firms will also issue statements over the next three days, SAMR said, calling on the public to help monitor the corporations and hold them to their word. The regulator had exhorted the tech giants to heed the example of Alibaba Group Holding Ltd., which was fined a record $2.8 billion following a four-month probe into the e-commerce titan for abuses like forced exclusivity.Meituan said in its pledge it will “consciously maintain market order” and “won’t force merchants to ‘pick one of two’ through unreasonable means.” The food delivery leader offered to actively work with regulators and said it accepted social supervision.Other e-commerce operators including JD.com, Suning.com Co. and Vipshop Holdings Ltd. also committed to not engage in forced exclusivity, a practice that the SAMR had criticized for “flagrantly” trampling and destroying market order. Pinduoduo and Dingdong Maicai -- major players in the red-hot community e-commerce sector -- also pledged to stay away from improper pricing.ByteDance, owner of hit apps like TikTok and Douyin, issued a 13-point pledge that included promises to strengthen its compliance management and avoid violations such as abuses of market power and unlawful mergers and acquisitions.Meituan gained nearly 4% and JD.com rose more than 2% in Hong Kong on Wednesday, recovering some of their losses from earlier this week. China’s wide-ranging campaign against its tech leaders has erased billions in value from the sector since November, when new laws on fintech and antitrust were introduced and regulators launched an offensive against Jack Ma’s empire, including the scuttling of Ant Group Co.’s $35 billion initial public offering.The 34 firms must undergo complete rectification after conducting internal checks and inspections over the next month, and make a pledge to society to obey rules and laws, the antitrust watchdog said in its statement Tuesday. Regulators will organize follow-up inspections and companies that continue to engage in abuses will be dealt with severely.Read more: China Warns 34 Tech Firms to Curb Excess in Antitrust Review(Updates with more details from statement starting in fifth pararaph)For more articles like this, please visit us at bloomberg.comSubscribe now to stay ahead with the most trusted business news source.©2021 Bloomberg L.P.