Ba Shusong, former Hong Kong exchange executive, vanishes from public view, sparking concern.

The former managing director and chief China economist of bourse operator Hong Kong Exchanges and Clearing (HKEX), Ba Shusong, has not appeared in public recently and could not be contacted, according to two sources familiar with the situation. Ba is important academic who frequently gave speeches at major conferences over the past decade on behalf of HKEX, speaking about Hong Kong’s role as a connector between mainland China and the world. Mainland media outlets reported that Ba was missing,...