Latest / The Bear Market Podcast with Fexingo: Surviving Downturns, Buying the Dip, and Long-Term Resilience / Index Funds and the Hidden Cost of Market Concentration
Transcript
- Lucas: So here's a number that's been sitting with me all week. As of the latest data, the top ten stocks in the S&P 500 now make up more than a third of the entire index. That's a record, and it means when you buy an S&P 500 index fund, you're making a much bigger bet on a handful of companies than you probably realize. Luna: Wait, a third? That's up from what, like a quarter a few years ago? Lucas: Yeah, roughly. In the mid-2010s it was around 20 percent. Now it's over 33. And that concentration has real consequences for how the index behaves. Take today's market, for instance. The S&P 500 is up 0.6 percent over the last five days, but the Dow is basically flat, down 0.1 percent. The Russell 2000, which tracks small caps, is up 1.3 percent. So the big-cap index is being carried by a few giants, while the broader market tells a different story. Luna: So the index isn't really the market anymore? It's more like a mega-cap growth fund in disguise. Lucas: Exactly. And that's the elephant in the room for anyone who's been told 'just buy the index and you're diversified.' You are diversified across 500 companies, but the weighting means that a single earnings miss from one of the top three can move the whole index more than a bad quarter from 200 small caps combined. Luna: Right. And we've seen that play out before, like when a big tech company warns and the Nasdaq drops a percent in a day, and everyone feels it even if they don't own that stock. Lucas: Precisely. And that's not just a short-term trading quirk. It changes the long-term risk profile of index funds. Historically, when concentration gets this high, it's often a sign that the market is vulnerable to a sharp correction if those mega-caps stumble. Not a prediction, but a structural risk that passive investors are now exposed to more than ever. Luna: And does that mean we should all abandon our index funds? Lucas: No, not at all. But it does mean we should think about what we're actually buying. There are simple ways to address the concentration. One is to add a small-cap index fund to the mix. The Russell 2000 is up 1.3 percent this week while the S&P is up 0.6, and that kind of divergence has been going on for a while now. Another option is an equal-weight S&P 500 fund, where each company gets the same allocation, so Apple isn't ten times the size of a mid-cap industrial. Luna: Equal weight sounds like a smart middle ground. But don't those funds underperform in strong bull markets, since they're not as heavy on the winners? Lucas: They have historically, yes. But that's exactly the point. When you're paying up for concentration, you're making a bet that the current winners will keep winning. Equal weight is a bet that mean reversion eventually happens. And right now, real GDP growth has cooled to 1.5 percent annualized, down from 2.1. That's a slower economy, and in slower economies, the market often broadens out because investors start looking for value beyond the mega-caps. Luna: So in a cooling economy, small caps might actually be the place to be. That's a contrarian take, given everyone's obsessed with AI and the big names. Lucas: It's not even contrarian when you look at the data. Small caps are more domestically focused, they're more sensitive to interest rates, and with the 10-year Treasury at 4.72 percent, up from 4.65 last week, they're facing a different cost of capital than the mega-caps that can borrow at near-risk-free rates. But that also means when rates stabilize, small caps could have more room to run. Luna: And speaking of rates, the yield curve is steepening again—the 10-year minus 2-year spread is now 48 basis points, up from 47. What does that tell us? Lucas: A steeper curve usually signals that the market expects stronger growth or higher inflation ahead. But given that real GDP is cooling, the more likely story is that long-term yields are being pushed up by term premium—investors demanding more compensation for holding long-duration bonds. That's not necessarily a good sign for stocks, especially if it persists. Luna: So we've got a slowing economy, a steepening curve, and record concentration in the index. That's a lot to digest. But before we get too deep into the bear case, I want to step back for a second. Lucas: Sure, what's on your mind? Luna: Look, if our money conversations have helped you think about your portfolio differently, or even just made you a little more curious about how markets work—a few of you have started supporting the show through buy me a coffee dot com slash fexingo. It's a small thing, but it genuinely helps us keep making these episodes without ads or sponsors. Lucas: Yeah, it's true. We don't have a big network behind us, and listener support is literally what covers the hosting costs and the research tools we use to pull numbers like that concentration figure. So if you've gotten something out of these conversations, that's one way to keep it going. Luna: And no pressure, honestly. Even a few dollars a month makes a difference. It just lets us keep digging into these topics without having to answer to anyone but you. Lucas: Anyway, back to the concentration problem. The point isn't to scare anyone out of index funds—they're still a fantastic tool for most investors. The point is to understand what you own. And when the top ten stocks are a third of your fund, you should ask yourself if that's the bet you want to make. Luna: And there are simple tweaks. Like, add a small-cap value fund, or an international fund, or even just a bit of cash to cushion the inevitable drawdowns. Lucas: Right. And the data from this week shows that the market is already starting to broaden out. The Russell 2000 is outperforming the S&P 500, and the Dow is lagging because it's more weighted toward industrials and financials, which are feeling the slowdown. So the rotation is happening, it's just not screaming at you if you only look at the headline index. Luna: So what would you tell someone who's 100 percent in an S&P 500 index fund right now? Lucas: I'd say don't panic, but do take a hard look at your allocation. If you're young and have a long time horizon, you can afford to ride out the concentration risk. But if you're near retirement or you're relying on that money for something specific in the next few years, you might want to diversify into areas that aren't so tied to the mega-cap tech trade. And I'd keep an eye on the VIX, which is at 14.67—low, but that's often when people get complacent. Luna: That's a good reminder. The VIX being low doesn't mean nothing's going to happen; it just means the market isn't pricing in much fear right now. Lucas: Exactly. And in that kind of environment, it's easy to think the good times will last forever. But the math of concentration tells us that when the index is that top-heavy, the potential for a sharp, index-level drawdown is higher than it's been in decades. Not a prediction, just a structural fact. Luna: So, bottom line for our listeners: index funds are still great, but they're not a one-size-fits-all solution anymore. You have to know what's inside. Lucas: And that's the takeaway. Think of the S&P 500 as a large-cap growth fund with a lot of concentration, and then decide if that's really what you want. If not, there are affordable ways to broaden your exposure. The key is to make that decision consciously, not by default. Luna: And with real GDP cooling and the yield curve doing its thing, it's a good time to review your plan. Lucas: Absolutely. As always, we're not telling you what to do with your money, but we want you to ask better questions. The index might be up, but the market underneath is more complex than ever. Luna: And that's exactly what we're here to unpack. Thanks for listening, everyone.