June 25, 2026

WEBINAR: When Strong Markets Become Narrow

The rise of the Mag 7 and AI has created more than a US index problem; it's created a portfolio problem. With AI-linked stocks now exceeding 40% of the S&P 500, and large AI-related IPOs already underway, the risk to passive investors, global indices, and institutional portfolios around the world is large and undeniable.

This session is not about market timing or 'calling a top.' It's focused on good governance and timely risk management. The risks are hiding in plain sight, but a less visible compounding risk is that strong past performance and the predictable lag of active managers could delay a much-needed review. We increasingly hear talk of moving to passive or low Tracking Error core mandates – options that, in our view, would only deepen concentration and reduce diversification at a risky time.

In this webinar, we review what tends to happen when strong, narrow markets reverse, drawing on examples spanning up to 190 years to put prospective returns in context. We offer several tangible strategies investors can implement today to guard against undue capital losses – an area where policy documents are often silent on extreme thematic exposures.

The right moment for a review is now, and we'll demonstrate that we 'eat our own cooking' by sharing how we are advising our own clients with simple, actionable ideas.
 

When Strong Markets Become Narrow with Maggie Hofmann, CFA and Marc Williams, CFA (53:28) 
 

View the webinar deck here.

For more information about Leith Wheeler strategies for diversifying risk, contact Mark or Maggie directly at:

• Marc Williams, CFA: MarcW@leithwheeler.com
• Maggie Hofmann, CFA: MaggieH@leithwheeler.com

Author

Maggie Hofmann

Principal, Associate Portfolio Manager - Institutional Clients

Marc Williams

Principal, Portfolio Manager - Institutional Clients