Saudi Arabian officials are discussing delaying Aramco’s initial public offering, after attacks on the company’s largest oil facilities sidelined more than half of the kingdom’s output, people familiar with the matter said.

The Saudi Arabian Oil Co., as Aramco is officially known, has been gearing up for a two-part IPO, in which it had hoped to first sell a sliver of itself to investors on the local Saudi exchange in November and then list shares internationally, according to people familiar with the matter. The listing plans have long been dogged by questions over valuation and the venue for an international stock market debut.