A technical outage at ASX Ltd. halted company announcements on Australia’s main stock market for hours on Monday, adding to a string of mishaps that have intensified regulatory scrutiny of the exchange and fueled calls for more competition.

The disruption started about an hour before the market opened, when the exchange stopped publishing statements after 8:59 a.m. Sydney time. ASX typically posts releases from 7 a.m. to 8:30 p.m. after adjusting for daylight saving, according to its website.