(Bloomberg) -- Participants in the $23 trillion U.S. stock market have become more vocal about structural changes they’d like to see after the trading turmoil on Aug. 24, according to an executive at UBS Group AG.

How to price ETFs in times of stress, triggers for trading halts, a lack of clarity on clearly erroneous trades, and the mechanics of circuit-breaker systems have been among the topics raised by UBS clients, said Vlad Khandros, global head of market structure and liquidity strategy. Some of the measures put in place to protect markets after the 2010 flash crash should be revisited, he said in a briefing.

Subscribe Now

Access to premium content including in-depth coverage of mutual funds, hedge funds, 401(K)s, 529 plans, and more.

3-Week Free Trial

Insight and analysis into the management, marketing, operations and technology of the asset management industry.