The China Securities Regulatory Commission is considering rules “to regulate share sales by major shareholders and senior executives in listed companies” which could make it harder to sell stocks after a precipitous fall by Chinese equities on Monday triggered the mainland stock market’s new circuit-breaker function, ending the first trading day of the year early, South China Morning Post reported, citing a statement published to the commission’s website. Friday will mark the end of a half-year ban on share sales by major shareholders and senior executives imposed by the CSRC on July 8 to stop the summer’s rally-turned-rout.