After two days in which it dragged the broader market lower, record gains by the Naspers stable led the JSE to its first advance in four days — almost wiping out its 2022 drop — as pledges by Chinese officials to boost the economy and business confidence gave a lift to its most valuable asset.

The JSE all share index jumped as Naspers and Prosus, the Amsterdam-based technology investor through which it holds a 29% stake in Chinese technology giant Tencent, both rose by more than a fifth...