China’s financial regulators are considering a number of cooling measures for the stock market as they grow concerned about the speed of a $1.2 trillion rally since the start of August, people familiar with the matter said.

The measures proposed to top policymakers in recent weeks include the removal of some short selling curbs, the people said, asking not to be identified as the information is private. Authorities are also contemplating options to rein in speculative trading on concern a sharp reversal might inflict heavy losses on retail investors.