There’s a financial problem that nobody warns you about when you’re just getting started, because it only happens to people who are doing really well. It’s the kind of problem that sounds almost ungrateful to complain about.
The problem is this: you got good at something, or lucky with something, or both, and now one asset makes up an uncomfortable percentage of your net worth. Maybe it’s the rental properties you’ve been buying since 2015. Maybe it’s the company stock that’s been granted to you over ten years at your tech job. Maybe it’s the business you built from scratch that now generates most of your family’s income and most of your household wealth at the same time. Maybe it’s a stock you bought because it was interesting, and now it’s grown to be the bulk of your portfolio.
Whatever the asset, the situation is the same. You built real wealth, and it concentrated itself. Congratulations, and also: we need to talk.
Why Concentration Risk Feels Like a Non-Problem
The reason concentration risk is so tricky to address is that it’s created by the same thing that makes people feel financially confident: success. When your rental portfolio has crushed it for a decade, or your company stock has tripled, or your business is generating strong cash flow, every instinct you have says “this is working, don’t mess with it.”
And those instincts aren’t entirely wrong. Diversification is, in a very real sense, a hedge against not knowing which asset will perform. If you actually do know, or if you have genuine edge and operating control, concentration can be rational. Warren Buffett has made this point. So has every tech founder who held their stock instead of diversifying and is now worth billions.
The problem is that most of us aren’t Warren Buffett, and we tend to overestimate how much control and insight we actually have. Your rental properties might be crushing it now, but they’re also exposed to a single metro, a single tenant type, a single interest rate environment, and a single regulatory regime. Your concentrated employer stock might be up 200%, but you also get your paycheck from the same company. If that company hits hard times, you could lose your job and watch your net worth crater at the same time. That’s not risk, that’s double risk, and it deserves a different kind of attention.
The goal of this article isn’t to talk you out of your best-performing asset. It’s to help you think clearly about what you actually own, what it’s exposed to, and what a sensible plan looks like for the second half of your FI journey.
Step One: Actually Measure It
Before you can address concentration risk, you have to quantify it honestly. This sounds obvious, but a lot of people have a general sense that one asset is “big” in their portfolio without actually running the numbers.
Pull up your full net worth picture, including every account, every property, every business interest, every chunk of employer stock, and your primary residence if you’re counting it. Then calculate what percentage of that total comes from each asset or asset class.
If any single asset makes up more than 20 to 25% of your total net worth, you have meaningful concentration. If it’s above 40%, you have a real problem worth solving. If it’s above 60%, solving it should be near the top of your financial priority list, because at that level, one bad outcome for that one thing could genuinely set your FI timeline back by years.
Here’s a useful reframe: instead of thinking about how well the asset has performed, think about how much of your financial future depends on it continuing to perform. Those are related, but they’re not the same question.
The Three Most Common Culprits
Employer stock and tech compensation
This is the most common version of concentration risk for high earners in tech, finance, and other industries that pay heavily in equity. You’ve been getting RSUs or options for years, some of them are vested, and if your company has done well, you might be sitting on a position worth multiple years of salary.
The psychological trap here is that you’re not buying the stock, it’s being given to you, so selling it feels like giving something back. It doesn’t feel like a portfolio decision. It feels like turning down a gift. But once those shares are vested, they’re just a stock position like any other. The question isn’t whether the company has been good to you. The question is whether you would buy that same position today with cash, at the current price, knowing that your income also depends on the company’s health.
Most people, asked that way, say no. So why are you holding it?
The answer is usually a combination of taxes, loyalty, and optimism about future performance. All three are worth examining. The tax issue is real but manageable, and we’ll get to it. The loyalty and optimism are emotional, not financial, and they’re exactly the kind of reasoning that keeps people overexposed to single names right up until something goes wrong.
A reasonable approach for most people with concentrated employer stock is to sell a meaningful chunk immediately upon vesting and diversify the proceeds, then hold a smaller position if you genuinely believe in the company’s long-term prospects. The exact split depends on your total financial picture, but “hold everything and hope” is not a strategy.
A concentrated real estate portfolio
Real estate is different from stocks in one key way: the concentration is often geographic as well as asset-class specific. If you own six single-family rentals and five of them are in the same city, you’re not just concentrated in real estate. You’re concentrated in one city’s job market, one city’s regulatory environment, and one city’s long-term demographic trends.
Real estate investors also have a version of the loyalty trap. You know these properties. You’ve fixed them up, dealt with the tenants, learned the neighborhoods. Selling feels like giving up something you built. And unlike selling a stock, selling a rental property is expensive, time-consuming, and has potential immediate tax consequences that are hard to ignore.
None of that means you shouldn’t sell. It means the decision requires more planning. If your rental portfolio makes up more than half your net worth, it’s worth asking whether that concentration serves you or whether it just happened over time while you were busy managing properties. And if you own ANY rental properties, you should ask yourself, “Would I buy this again, knowing what I know now?”
A closely held business
Business owners face the sharpest version of this problem because the business is often the largest asset and the primary income source simultaneously. You’re not just financially exposed to the business; your entire life is structured around it. Thinking about diversifying away from the business can feel like thinking about dismantling your identity, not just rebalancing a portfolio.
But the financial logic here is especially compelling. If your business is worth $1.5 million and your other assets total $300,000, roughly 83% of your net worth depends on an illiquid, non-diversified, owner-operated asset that exists in a single industry and probably serves a fairly narrow market. If the business hits a rough patch, or if you can’t work for a period due to health issues, or if a competitor undercuts your pricing, your entire financial picture changes at once.
For business owners, addressing concentration risk often means one of a few things: paying yourself more aggressively and investing outside the business, taking on a minority investor to create some liquidity, pursuing a partial or full sale, or building toward a formal exit with a real valuation and timeline. The right answer depends on where you are in your FI journey and how much of your retirement plan depends on the business continuing to generate returns versus being sold.
The Tax Problem (And Why It’s Not as Bad as You Think)
The most common objection to addressing concentration risk is taxes. If you sell a position with a large unrealized gain, you owe capital gains tax on that gain. For long-term positions, federal rates are 15% or 20% depending on your income, plus state taxes in most places. On a large gain, that can feel like a brutal toll.
But here’s a reframe that changes how most people feel about this: paying capital gains tax on a large gain means you made a large gain. The tax isn’t a punishment; it’s a percentage of the profit you wouldn’t have otherwise had. The question isn’t whether the tax bill is painful. The question is whether the after-tax, diversified portfolio you end up with is a better long-term outcome than the concentrated, pre-tax position you’re holding.
It could very well be. The expected cost of maintaining extreme concentration, measured by the risk of a catastrophic loss, almost always exceeds the one-time tax cost of diversifying. Studies on concentrated equity positions consistently show that single stocks underperform diversified portfolios on a risk-adjusted basis over long periods, even when you account for the tax drag of diversification.
A few strategies can help manage the tax bite. If you’re in a year with lower income, long-term capital gains may be taxed at a lower rate than usual. If you can spread sales across multiple tax years, you can smooth out the income recognition. If you have capital losses elsewhere in your portfolio, those can offset gains. If you’re charitably inclined, donating appreciated shares directly to a donor-advised fund lets you avoid capital gains entirely while still getting the deduction. And if you’re in California, well, our condolences, but the math usually still works out in favor of diversifying.
None of these strategies requires perfection. The goal is to reduce the concentration at a reasonable after-tax cost, not to optimize every dollar.
Building the Diversification Plan
Once you’ve measured the concentration and made peace with the tax reality, the actual plan is usually simpler than people expect.
Set a target. If you’re currently at 65% in one asset, decide what percentage feels like a manageable, rational allocation for that asset given your overall plan. For employer stock, most financial planners suggest no more than 10 to 15% of your portfolio in any single company. For real estate, something like 30 to 40% of net worth is workable if you have genuine operating knowledge and cash-flowing properties, but above that, the geographic and liquidity risks start to compound. (If you’ve built your real estate portfolio on purpose and truly want the bulk of your net worth in real estate, this suggestion isn’t aimed at you. This is for those who have started to question their holdings.) For a closely held business, the target depends heavily on your exit timeline and how much of your retirement plan is built around a sale event.
Set a timeline. Aggressive diversification in a single year can create a tax problem bigger than the concentration problem you’re solving. Spreading it over multiple years usually makes more sense and gives you flexibility to manage the income recognition.
Decide where the proceeds go. This is the part people sometimes skip, and it matters. If you sell a concentrated position and let the proceeds sit in cash, you’ve solved one problem and created another. The point of diversifying is to end up with a portfolio that’s broadly allocated across asset classes, geographies, and risk factors. For most FI-chasers, that means low-cost index funds across domestic stocks, international stocks, and bonds, with an allocation mix that fits their timeline and risk tolerance.
Automate where possible. If you’re receiving ongoing equity grants, set a standing sell order so that shares are sold shortly after they vest. This prevents the psychological attachment that builds up when you watch a position grow for months before making a decision. The default should be to sell and diversify, with holding as the intentional exception, not the other way around.
Consult your Investor Policy Statement. If you don’t have one, watch this episode of the BiggerPockets Money Podcast with Bob Haines and create one. You’ll probably also want to fill out the Goal Setting Worksheet…
The Uncomfortable Truth About Holding
Here’s the thing that nobody likes to hear after a run of great performance on a single asset: past performance really doesn’t tell you what’s going to happen next. Not with individual stocks, not with real estate in a specific market, and not with a privately held business in a specific industry.
The people who got richest by concentrating in one thing got there partly through skill, partly through timing, and partly through luck, and almost none of them can tell you honestly which one mattered most. What they can tell you, if they’ve been honest with themselves, is that the outcome could have gone very differently.
You’re halfway to FI. You’ve built real wealth. The job of the second half of the journey isn’t to repeat the concentration bet that got you here. It’s to protect what you’ve built, diversify toward a finish line, and make sure that one bad year for one asset can’t undo a decade of excellent decisions.
The goal was never to bet it all on the thing that’s working. The goal was financial independence, and that means building a portfolio that can survive the things you don’t see coming.
Diversify the win. Future-you will be genuinely, boringly grateful.
This article is for educational purposes only and does not constitute financial or tax advice. Please consult a qualified financial advisor or tax professional for guidance specific to your situation.
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