The chances that Jack Ma’s Ant Group Co. will be able to revive its massive stock listing next year are looking increasingly slim as China overhauls rules governing the fintech industry, according to regulatory officials familiar with the matter.

Ant is still in the early stages of reviewing changes needed to appease regulators, who demand that its business comply with a slate of new and proposed guidelines in areas including lending to consumers, the officials said. With so much work needed and some rules not yet spelled out, the officials said the initial public offering may not get done before 2022.

An additional delay of a year or more would be another setback for billionaire Ma, as well as the early-stage investors including Warburg Pincus LLC that were counting on a windfall from what was poised to be a record $35 billion IPO. It would also deal a potential blow to Alibaba Group Holding Ltd., which owns a third of Ant and saw its stock tumble after the deal was abruptly suspended this month.