The ETF wrapper has become investing's Swiss Army knife, packaging everything from stocks and bonds to gold and Bitcoin — and now, perhaps, even prediction markets. As issuers race to push the boundaries of what's possible, regulators at the Securities and Exchange Commission are rewriting their playbook in real time.

On this episode of Trillions, Eric Balchunas and Joel Weber sit down with Brian Daly, Director of the SEC's Division of Investment Management, to discuss the explosion of "novel" ETFs, why the agency hit pause on prediction-market funds, and what it's learned from its handling of crypto ETFs. Daly offers a rare behind-the-scenes look at how ETF filings are reviewed, explains why the SEC wants a more predictable process for evaluating new products, and discusses how regulators are balancing innovation with investor protection. Bloomberg News SEC and CFTC reporter Lydia Beyoud joins the conversation.