Show Notes
Episode 46: Are 30 stocks enough to build a truly diversified portfolio? We seek to answer one of investing's most debated questions: How many stocks does an investor really need to own to reduce risk and improve long-term outcomes? While traditional financial research once suggested that owning 20 to 30 stocks captured most diversification benefits, today's global markets may tell a very different story. The discussion dives into the evolution of diversification theory, from the early days of Modern Portfolio Theory and Harry Markowitz to the modern reality of investing across more than 40 countries and thousands of publicly traded companies. We examine why a concentrated portfolio of 30 stocks may expose investors to greater risks tied to countries, sectors, and individual companies—and why broad diversification can provide better flexibility, lower implementation costs, and potentially more reliable outcomes over time. Using real-world examples, including return differences between countries like Spain and Denmark, as well as performance gaps between companies in the Magnificent 7, the conversation highlights how difficult it can be to consistently "pick the winners." We also touch on concepts like tracking error, sampling strategies in index funds, securities lending, investor discipline, and the trade-offs between concentration and diversification. Importantly, the discussion goes beyond investing in stocks alone as we explore how diversification applies to fixed income portfolios, including why bond diversification should be aligned with an investor's goals, risk management needs, and time horizon. In Episode 46 of The Informed Investor, Dimensional's Mark Gochnour, Head of Global Client Services, Wes Crill, Senior Client Solutions Director, and Jake DeKinder, Head of Client Communications, take a practical and thought-provoking look at what diversification really means in today's investment landscape, whether you're building a portfolio yourself or working with a financial advisor. Subscribe to the Stay Calm Investing Newsletter https://www.staycalminvesting.com/newsletter
The Informed Investor Feedback Survey https://www.dimensional.com/us-en/informed-investor-survey
The Informed Investor on YouTube https://www.youtube.com/playlist?list=PLCyJr6FFig-h1mA7rVP7Mbk0irFw2wA90 Dimensional Fund Advisors Shorts on YouTube https://www.youtube.com/@dimensionalfundadvisors/shorts
Mark Gochnour on LinkedIn https://www.linkedin.com/in/mark-gochnour-9a23598a/
Wes Crill on LinkedIn https://www.linkedin.com/in/wes-crill-77a49417/
Jake DeKinder on LinkedIn https://www.linkedin.com/in/jake-d-4105b98/
Learn more at https://www.dimensional.com/
More from The Informed Investor
Episode 62: Happy Halloween—or is it? At this moment, some investors are probably chewing their fingernails down to nubs as they try to digest the latest frightening financial headlines. "Are Global Stock Markets Headed for a Crash?" "The American Dream of Owning a Home Is Out of Reach for Many as Mortgage Rates Soar (Again)" "The US Debt Tops a Record-Shattering $40 Trillion. Yes, with a T." Eek!! Those are actual headlines from recent articles in the financial media (and just a small sample). Hundreds more are just waiting to scare the bejabbers out of you. But as an investor, if you're worried about the current state of the stock and bond markets, the economy, or the latest geopolitical hot spots, headlines are the last place to look for reassurance. Many, if not most, are designed to make you afraid. The facts, on the other hand, will often do just the opposite. In Episode 62, a special Halloween episode of The Informed Investor podcast, Dimensional's Mark Gochnour, Head of Global Client Services, Wes Crill, Senior Client Solutions Director, and Jake DeKinder, Head of Client Communications, dress up … and then dress down the headline writers of America to help investors deflate the fear factor. LINKS FROM TODAY'S EPISODE: "Stay Calm: Learn to Embrace Uncertainty in Investing and Life" Order the new book by Dimensional Founder David Booth https://www.amazon.com/gp/product/B0GPDHGH8K/?maas=maas_adg_2F97289929AB0BA26D806A1F81D55D66_afap_abs&ref_=aa_maas&tag=maas&smid=ATVPDKIKX0DER Subscribe to the Stay Calm Investing Newsletter https://www.staycalminvesting.com/newsletter?utm_source=youtube&utm_medium=organic&utm_campaign=informed_investor For US audiences: Select videos are available as part of an opportunity for CFP® and Investments & Wealth Institute® professionals to earn continuing education (CE) credits https://www.dimensional.com/financial-professionals/ce-credit-experience-d360?utm_source=youtube&utm_medium=organic&utm_campaign=informed_investor The Informed Investor: Feedback Survey https://www.dimensional.com/us-en/informed-investor-survey?utm_source=youtube&utm_medium=organic&utm_campaign=informed_investor "The Informed Investor" on YouTube The Informed Investor - YouTube Dimensional Fund Advisors Shorts on YouTube https://www.youtube.com/@dimensionalfundadvisors/shorts Mark Gochnour on LinkedIn https://www.linkedin.com/in/mark-gochnour-9a23598a/ Wes Crill on LinkedIn https://www.linkedin.com/in/wes-crill-77a49417/ Jake DeKinder on LinkedIn https://www.linkedin.com/in/jake-d-4105b98/ Learn more at https://www.dimensional.com/?utm_source=youtube&utm_medium=organic&utm_campaign=informed_investor
Episode 61: The allure of index funds, such as broad diversification, low costs, and market-matching returns, may seem undeniable. But recent "reconstitution" in the indexes tracked by such funds tells a different story—one every investor should understand.
Episode 60: Every two years, millions of investors probably ask themselves (and their advisors) whether looming elections demand changes to their investment portfolios. It's an understandable sentiment—and one that demands discussion. But the most important conclusion from these conversations should never change: Since the data doesn't show any strong connection between election results and stock market performance, it's best to vote with your ballot, not your portfolio. No matter how you slice, dice, or take a hatchet to the data, factor in your own political proclivities, or scream about what you think is totally wrong or right about the candidates, market prices have already incorporated all that information (and thousands of other developments, including numerous economic indicators) as investors consider what to do next. This is a well-researched theory of how capital markets work. The implication is that the stock market doesn't really care what you think about this year's midterm elections or the next presidential horse race. Need supporting evidence? Fourteen of 17 presidential terms since 1929, across administrations with both Democratic and Republican chief executives, ended with positive returns for the S&P 500 Index. (S&P data © 2026 S&P Dow Jones Indices LLC, a division of S&P Global.) Investors shouldn't ignore elections, of course. But their portfolios may benefit from standing pat as politics rile and emotions rock and roll. In Episode 60 of The Informed Investor podcast, Dimensional's Mark Gochnour, Head of Global Client Services, Wes Crill, Senior Client Solutions Director, and Jake DeKinder, Head of Client Communications, interrogate common myths about the impact of elections on markets and offer sensible answers as investors head to the polls. LINKS FROM TODAY'S EPISODE: "Stay Calm: Learn to Embrace Uncertainty in Investing and Life" Order the new book by Dimensional Founder David Booth https://www.amazon.com/gp/product/B0GPDHGH8K/?maas=maas_adg_2F97289929AB0BA26D806A1F81D55D66_afap_abs&ref_=aa_maas&tag=maas&smid=ATVPDKIKX0DER Subscribe to the Stay Calm Investing Newsletter https://www.staycalminvesting.com/newsletter?utm_source=youtube&utm_medium=organic&utm_campaign=informed_investor The Informed Investor: Feedback Survey https://www.dimensional.com/us-en/informed-investor-survey?utm_source=youtube&utm_medium=organic&utm_campaign=informed_investor "The Informed Investor" on YouTube The Informed Investor - YouTube Dimensional Fund Advisors Shorts on YouTube https://www.youtube.com/@dimensionalfundadvisors/shorts Mark Gochnour on LinkedIn https://www.linkedin.com/in/mark-gochnour-9a23598a/ Wes Crill on LinkedIn https://www.linkedin.com/in/wes-crill-77a49417/ Jake DeKinder on LinkedIn https://www.linkedin.com/in/jake-d-4105b98/ Learn more at https://www.dimensional.com/?utm_source=youtube&utm_medium=organic&utm_campaign=informed_investor For US audiences: Select videos are available as part of an opportunity for CFP® and Investments & Wealth Institute® professionals to earn continuing education (CE) credits https://www.dimensional.com/financial-professionals/ce-credit-experience-d360?utm_source=youtube&utm_medium=organic&utm_campaign=informed_investor
Episode 59: What happens when you rethink how financial advice is delivered—and how an industry comes together?
Episode 58: Any financial professional who joined the industry a week after Black Monday—when the stock market suffered its biggest single-day loss—knows something about investment discipline.