Among the 4,261 suspects in 1,886 cases, 391 were insiders in industries such as banking, education, telecommunications, delivery services, stock market and e-commerce, the Ministry of Public Security said.
Police have also arrested 1,747 suspects involved in 828 cases related to hacking.
Personal information infringements have increased in the recent years, leading to a rise in fraud and racketeering, state-run Xinhua news agency reported.