The Shanghai Prosecution Service arrested Liu Dong, president of the 21st Century Business Herald's website 21cbh.Com, and its deputy editor-in-chief Zhou Bin, on charges of suspected extortion, forced transaction and graft.
They were arrested alongside other media executives, including Money Week publisher Xia Ri and its chief editor Luo Guanghui, as well as Xia Xiaobo, who was in charge of a branch of 21st Century Business Herald in central China's Hunan Province, state-run Xinhua news agency reported.
The two were caught alongside the publication's editor-in-chief, surnamed Liu, as well as two other sales personnel.
Earlier, eight media personnel had been detained, including members of 21cbh.Com as well as heads of two PR firms, on suspicion of extorting money from more than 200 companies in return for favorable coverage on the site.
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21cbh.Com is run by Guangdong-based 21st Century Media Co Ltd, which claims on its website to be "the largest" professional media operator in the Chinese financial and business media industry.
Under regulations set by the State Administration of Press, Publication, Radio, Film and Television, which manages the practices of all journalists in China, press credentials will be revoked in cases where media organisations have acted illegally.
Chinese authorities have been stepping up a crackdown on extortion in the media and paid-news.
They have discovered problems such as press cards issued to people who are not journalists and newspaper websites contracted to advertising or PR agencies.