BEIJING, July 7 (Reuters) - China"s market regulator said on Wednesday it has fined a number of internet companies including Didi Chuxing (DIDI.N), Tencent (0700.HK) and Alibaba (9988.HK) for failing to report earlier merger and acquisition deals for approval, according to a statement on the website of the State Administration of Market Regulation (SAMR). The regulator fined the companies 500,000 yuan each case, for not seeking approval in 22 deals, citing the country"s anti-monopoly laws. Subsidiaries of Didi are involved with 8 of the 22 deals. In one of the cases, Didi established a joint venture company with China FAW Group Corporation (SASACJ.UL) in 2018, without reporting the deal for antitrust reviews before the new company"s registration. Ride-hailing giant Didi, still fresh on the heels of its IPO on the New York Stock Exchange, has seen its shares plunge as China launched investigations on national security grounds and removed its App from app stores. The platforms fined also include Beijing Sankuai Technology, a Meituan-affiliated (3690.HK) company, and online retailer Suning.com (002024.SZ).