I found this rule from SEC: Quote: Under the
Post# of 148117
Quote:
Under the proposed rules, between 7:00 a.m. and the opening of trading on the Exchange, the Exchange may implement a regulatory halt in circumstances where:
the listed company has informed the Exchange staff that it intends to make a public announcement of material news; and
the listed company requests that trading in its listed securities be halted pending dissemination of the public announcement (“Pre-Market Halt”).