The Thoughtful Investor

Is the Market Too Expensive? The Truth About AI and Today's Stock Market

Bryan Yach, CFP® Season 1 Episode 1

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0:00 | 13:35

📈“The market is expensive.”📉 It’s a phrase investors hear constantly. But what exactly do we mean by the market?

In the first episode of The Thoughtful Investor, Bryan Yach, CFP® explores the concentration of the S&P 500, the extraordinary rise of today’s largest technology companies, and why a great company isn’t necessarily a great investment at every price. With the recent artificial-intelligence boom, it's a good reminder that markets move in cycles.  

Rather than trying to predict whether AI is a bubble or which company will become the next market champion, Bryan looks at a more useful question: What expectations are already reflected in today's prices, and how should a thoughtful investor prepare for a future nobody can know? 

It’s a conversation about concentration, valuation, diversification, changing market leadership and why successful investing may have less to do with predicting what happens next than building a plan that doesn’t require you to.

🎙️Follow The Thoughtful Investor for future episodes exploring markets, investing, financial planning, and the ideas shaping today’s investors.  

Bryan Yach, CFP® is a Wealth Advisor with more than 15 years of experience helping individuals and families navigate investing, retirement, and complex financial decisions. His approach emphasizes thoughtful financial planning, disciplined investing, and making sure the risks people take with their money actually serve the life they’re trying to build.

Yach Advisors is a financial planning and investment firm serving individuals and families who want their investments to be part of a larger financial plan. The firm provides comprehensive guidance across investment management, retirement planning, tax-aware strategies, estate planning coordination, risk management, and other financial decisions that become increasingly important as wealth grows.

www.YachAdvisors.com  

The opinions contained in this material are those of the author, and not a recommendation or solicitation to buy or sell investment products. This information is from sources believed to be reliable, but Cetera Wealth Services, LLC cannot guarantee or represent that it is accurate or complete.
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— The Market Is Expensive

Bryan Yach, CFP®

The market is expensive. You've probably heard that sentence more times this year than you can count. I know I have. It shows up in the headlines on television and YouTube thumbnails and at backyard barbecues. It's become one of those phrases we repeat so often we rarely stop to ask a simple question. What do we really mean by the market? Because I think once you answered that question, the entire conversation changes. Hello, I'm Bryan Yach, Wealth Advisor, owner of Yach Advisors in South Lake, Texas. Imagine standing at Churchill Downs on Derby Day. 500 horses are lined up at the starting game. I know that's absurd. 500 is a lot of horses. Bear with me. We'll get through this analogy. Some of the horses are champions, some are newcomers, some have been winning for years, while others haven't had their moment in the sun. The race begins, but almost immediately the camera stops showing all 500 horses. They zoom in on a handful of the leading pack. Let's just say about 7 to 10 of them. The commentators analyze them, the headlines celebrate them. Before long, you almost forgot the rest of the field exists.

— Not Every Company on the S&P500 is Created Equal

Bryan Yach, CFP®

Now, if you're following here, you know 500 was intentional, and you know 7 to 10 is intentional because we're talking about what most people think of when they think of the stock market, the SP 500, the standard and pores. The SP 500 sounds perfectly diversified, right? 500 of the largest companies in the US, representing every major industry and sector, and it's diversified. 500 companies. But it's also weighted by size or market cap, which means that not every company has the same influence. As of July 2026, when this is being recorded, the 10 largest companies make up roughly 36% of the entire index. Let me say that again. As of July 2026, the 10 largest companies, because it's market cap weighted, make up roughly 36% of the entire index. 36 cents of every dollar put into the SP goes into 10 companies. One company alone, NVIDIA, currently the largest, makes up for about 7.5%. Here's an interesting note. It would take around 250 of the smallest companies in the SP 500 to make up the market cap of one stock NVIDIA. So NVIDIA has the market cap of 250 of the smaller companies on the SP. These aren't small companies either. In those 250, there's name brands like Expedia, Hershey, Dr. Pepper, Kraft Heinz, Halliburton, Hewlett-Packard, T Row Price, Clorox. These aren't tiny startups. These are household names. These are huge companies. Yet together the market cap of these 250 companies barely equal one. That means when these companies have a spectacular year, it feels like the market is unstoppable. When they struggle, suddenly everyone starts asking whether the market is in trouble. They're asking about the economy, but they're referencing the market. If the SP is down, does that mean the economy's not doing well, or does it mean that those 10 companies aren't doing well? If our portfolio is large cap heavy, we're often reacting to the performance of a remarkably small group that pulled away from the rest of the field. Going back to Churchill Downs, we're reacting to the performance of a small group that's pulled away from the rest of the field. The top 10

— Is the S&P500 Diversified?

Bryan Yach, CFP®

horses. You might think, fine, I'll just buy a total market index instead, right? So that's more stocks. That should be better diversified. It's certainly more diversified. Technically, it owns over 3,700 companies. But here's what's fascinating: it's still market cap weighted, and nearly 89% of its value is made up of the SP 500. So if you buy a total market index, 90 cents on the dollar is right back in the SP 500. You're only getting 10% more diversification there. And those same 10 megacap companies still make up roughly 32% of the entire fund. In other words, adding another 3,200 companies changes the number of holdings dramatically, but it changes the portfolio much less than most

— Today’s Winners Aren’t Permanent

Bryan Yach, CFP®

people think. But think about it. What do you think the number one company on the SP 500, the largest company in the US was 15 years ago? It wasn't Apple. It wasn't Microsoft. It wasn't NVIDIA. It was ExxonMobil, a spot that it held from 2005 all the way until 2012 when it lost its top spot to Apple. That surprises a lot of people. If you're curious, ExxonMobil now sits at the number 17 spot. So it's no slouch, but that still makes up for less than 1% of the index. Less than 1% of the index is what used to be the largest company. Go back another decade, and the largest company before that was General Electric. Go back further, you'll find companies like IBM. Each generation tends to believe its champions are permanent. In the early 2000s, oil seemed indispensable. Industrial manufacturing seemed untouchable. Every generation has its defining innovation. Today, many people believe that innovation is AI, artificial intelligence. History has a way of reminding us that leadership is temporary. The companies change, industries change, consumer preferences change, technology changes, capital flows towards whatever appears to solve tomorrow's problems better than today's solutions. That's not a flaw in capitalism. That's the entire point. What is tomorrow's innovation going

— Is AI Another Dot-Com Bubble?

Bryan Yach, CFP®

to be? If you only follow the headlines, you'd think that there's only two possible conclusions. Either AI is the greatest investment opportunity of our lifetime, or we're watching the biggest run-up since the dot-com bubble. I don't find either explanation particularly satisfying. There's certainly similarities, like in the late 1990s, we're witnessing a transformative technology that's attracting enormous amounts of capital. Companies are racing to build infrastructure they believe will power the next generation of computing. Back then it was all fiber optic networks, internet infrastructure. Today it's data centers, advanced semiconductors, network equipment, and enough electricity and energy to power them all. But that doesn't necessarily tell us a whole lot about whether earnings are going to be sustainable through this big boost in investment. That remains to be seen. And the market has high expectations. But there's important differences too. Many of the companies at the center of the dot-com boom had little more than a promising idea and a website. You've probably heard the term garage startup. Literally taken from the idea that you're starting a multinational corporation out of your mom's basement or garage. Today's leaders are some of the most profitable businesses ever created. Microsoft, Apple, Alphabet or Google, Amazon, Meta, Facebook, and Nvidia generate extraordinary cash flows, maintain Fortress balance sheets, and employ some of the brightest engineers in the world. They've already transformed the way billions

— Great Companies, Expensive Stocks

Bryan Yach, CFP®

of people live and work. That isn't optimism, that's simply an acknowledgement of what these companies have already accomplished. But there's another distinction investors sometimes overlook. A great company isn't automatically a great investment. You can own one of the best businesses ever created and still earn disappointing returns if you pay too much for it. Investing has never been just about buying wonderful companies. It's about buying them at prices that leave room for reality to exceed expectations. That's why I think the more interesting question isn't whether AI will change the world. It already has. The more difficult question is whether today's stock prices already assume most of that success or whether there's still value

— The AI Arms Race

Bryan Yach, CFP®

there. That's why I find the current wave of AI investment so fascinating. Every major technology company spending a staggering amount of money building data centers, buying chips, expanding power infrastructure, and racing to develop artificial intelligence. It's tempting to look at those numbers and conclude that everyone's lost their minds. I'm not convinced that's what's happening. Imagine you're the CEO of one of those companies. If artificial intelligence truly transforms the global economy and you fail to invest, history may remember you as the executive who missed out on the biggest technological shifts of the century. On the other hand, if you invest too much, you may waste billions of dollars, but your company probably survives. One mistake is existential, the other is expensive. When viewed from that lens, the race begins to make a lot more sense. They can't afford to be the only horse that stops running. This reminds me a lot of how mutual fund companies tend to track pretty closely to the index because if they deviate too far from the index, they risk underperforming their peers. Now, in order to outperform your peers, you have to risk being the outlier. But it's a lot easier to justify to shareholders that, hey, I'm doing bad because the index is doing bad when you're close to the pack. Whereas if you're doing worse than the index, you're you're out of job. So in order to be a good CEO, you're you're needing to at least stay competitive in your investment in these

— When the Technology Wins but Investors Lose

Bryan Yach, CFP®

technologies. History also offers a useful reminder. Transformational technologies often changed the world. Railroads changed America. Electricity transformed industry. Oil and gas fueled America. The internet reshaped nearly every aspect of modern life. But while those technologies become indispensable, not every investment associated with them produced extraordinary returns. Sometimes too much capital rushes into a promising idea. Sometimes expectations outrun reality. The technology succeeds while investors who paid the highest price are forced to wait years for the fundamentals to catch up. That's why I think the question, are we in a bubble, is probably the wrong question. The answer will be revealed in time, but a more interesting question is what expectations are already built in today's prices? And will this investment pay off in the long run? If artificial intelligence delivers decades of productivity gains, today's investments may look brilliant. If those gains arrive more slowly than investors expect, the businesses themselves may continue thriving while the stocks struggle to justify the optimism that was already priced in. If AI doesn't monetize, then the bottom could fall out, even though it may be a high-quality company with great earnings

— The Race Never Ends

Bryan Yach, CFP®

and a promising future. Those are two very different outcomes. As investors, it's tempting to spend our time trying to identify the next champion to predict which horse will win the race. History suggests that's an incredibly difficult game and comes with a lot of pitfalls. The better lesson may be simpler. The race never ends, the leaders change, capitalism keeps going. Yesterday's champions become today's incumbents. And today's incumbents eventually make room for tomorrow's innovators. Rather than assuming today's winners will dominate forever, I think it's wiser to remember that markets are constantly reinventing themselves. That's what they've always done. And if history is any guide, that's what

— Diversification and the Limits of Certainty

Bryan Yach, CFP®

they'll continue to do. That's also one of the main reasons diversification exists. Diversification isn't an admission that you don't know anything, it's an acknowledgement that the future is bigger than your certainty. One of my favorite illustrations of this is the periodic table of investment returns. If you've never seen it before, it almost looks random. Every year the colors reshuffle. Large cap stocks lead one year, international stocks lead another, small companies have their turn, real estate has its moment, bonds step in to manage risk and down markets. You look at some of the worst markets, bonds and cash are the best performers. Yesterday's winner often becomes tomorrow's laggard, and yesterday's disappointment sometimes

— Dare to be Boring

Bryan Yach, CFP®

becomes tomorrow's leader. The lesson is that a disciplined investment strategy starts with preparing for all outcomes and not getting caught up in the news cycle. I know that's boring. You've got to be boring. You want to be a good investor, you have to be boring. You can't be the hare and the tortoise in the hare. You have to be the tortoise. You have to be boring. The market has never stood still. It didn't stop with railroads, electricity, oil, the internet, AI, and it won't stop with whatever comes next. The names will change, the leaders will change, the headlines will change, but the principles of successful investing rarely do. You cannot control what happens next. However, as an investor, you want to put your time and energy in things you can control. Build a diversified portfolio, follow a thoughtful plan, stay disciplined in a world that gets noisy. Meet with a financial advisor if this isn't something that you want to do yourself and make sure that person's a fiduciary. Make sure they have your best interest in mind. Make sure that the investments that you're being put in aren't speculation type investments, that they're broad enough to plan for all different outcomes. Ask the question, what happens if the market does this? Ask the question, in 2008, what did the conversation sound like when I was going through this volatility? What will it sound like next time at this stage in my life? I want to make sure I have a plan that's going to give me the best chances of success regardless of what happens with the market, regardless of if AI monetizes the way that the market thinks. If you enjoyed this perspective, consider subscribing. Here we focus less on predicting what's next and more on understanding the principles that have stood the test of time. Because markets will always surprise us. But a good plan doesn't have to. I'm Bryan Yach, Wealth Advisor, and owner of Yach Advisors. Thank you for joining.