44:I[185,["/_next/static/chunks/08z4tkzvltetr.js","/_next/static/chunks/121~yigv24_j6.js","/_next/static/chunks/0a~e7k..h6jfc.js","/_next/static/chunks/0za7dr7c2y81~.js","/_next/static/chunks/03klviw01y.ih.js","/_next/static/chunks/0gx_3vy1-syt4.js","/_next/static/chunks/0i6hzvr84kc1r.js"],"SendEmailButton"] 46:I[63625,["/_next/static/chunks/08z4tkzvltetr.js","/_next/static/chunks/121~yigv24_j6.js","/_next/static/chunks/0a~e7k..h6jfc.js","/_next/static/chunks/0za7dr7c2y81~.js","/_next/static/chunks/03klviw01y.ih.js","/_next/static/chunks/0gx_3vy1-syt4.js","/_next/static/chunks/0i6hzvr84kc1r.js"],"AddToLibraryButton"] 47:I[29721,["/_next/static/chunks/08z4tkzvltetr.js","/_next/static/chunks/121~yigv24_j6.js","/_next/static/chunks/0a~e7k..h6jfc.js","/_next/static/chunks/0za7dr7c2y81~.js","/_next/static/chunks/03klviw01y.ih.js","/_next/static/chunks/0gx_3vy1-syt4.js","/_next/static/chunks/0i6hzvr84kc1r.js"],"ShareButton"] 49:I[45269,["/_next/static/chunks/08z4tkzvltetr.js","/_next/static/chunks/121~yigv24_j6.js","/_next/static/chunks/0a~e7k..h6jfc.js","/_next/static/chunks/0za7dr7c2y81~.js","/_next/static/chunks/03klviw01y.ih.js","/_next/static/chunks/0gx_3vy1-syt4.js","/_next/static/chunks/0i6hzvr84kc1r.js"],"SignupCTA"] 3d:["$","h1",null,{"className":"max-w-[22ch] font-display text-[clamp(32px,4.5vw,48px)] font-medium leading-[1.05] tracking-[-0.02em] text-[color:var(--fg-1)] text-balance","children":"Ep. 70 Can a 100% S&P 500 Portfolio Survive Retirement?"}] 3e:["$","div",null,{"className":"flex flex-wrap items-center gap-x-4 gap-y-1 font-mono text-[12px] uppercase tracking-[0.1em] text-[color:var(--fg-3)]","children":[["$","time",null,{"dateTime":"2026-02-26T15:00:00.000Z","children":"February 26, 2026"}],["$","span",null,{"aria-hidden":true,"children":"·"}],["$","span",null,{"children":"00:13:41"}],false]}] 45:T55b,

Many investors assume that owning the S&P 500 means they’re fully diversified. But in today’s market, that may not be true.

In this episode of Not Just Numbers, Mike and Madison discuss growing concentration in the U.S. stock market and why broad index funds may carry more risk than investors realize. With a small group of mega-cap companies driving a large portion of returns, portfolios that appear diversified on the surface can be heavily concentrated underneath.

The conversation explores market history, including the 50% declines of the 2000s, the danger of sequence of returns risk in retirement, and why averages can be misleading when withdrawals are involved. Index funds remain powerful tools, but they aren’t a complete portfolio on their own. True diversification means preparing for different market environments — not just relying on what has worked recently.

NYT article: https://www.nytimes.com/2026/01/30/business/stock-market-concentration-risk.html?unlocked_article_code=1.IVA.Ja1X.8WJsghdHvvIL&smid=nytcore-ios-share