When Your Best Investment Becomes Your Biggest Risk

“How do I not blow this?”

That’s the real question a client of mine asked, though it took him a while to get there. He’d joined a company early, stayed through the ups and downs, and watched a single stock position grow into something worth more than every other line in his portfolio combined. He didn’t ask me how to get richer. He asked how not to lose it.

I’ve sat across the table from that question more times than I can count, in all kinds of forms – Restricted Stock Units (RSUs) piled up year after year at a public company, options from a startup that finally had its moment, or shares inherited from a family business. Every time, I notice the same thing: a concentrated position rarely announces itself as risky. It just feels like winning, right up until it doesn’t.

So that’s the question worth asking honestly, before the stakes get any higher:

“If your biggest asset is one company’s stock, what would actually happen to your life if that stock fell hard and never came back?”

How concentration quietly builds

Nobody sits down one day and decides to put half their net worth into one company. It happens gradually – a grant here, a vest there, a decision to “let it ride” because the stock has been on a tear and selling feels like betting against yourself. Layer a rising share price on top of that inertia, and a modest equity grant from a few years ago can quietly become the single largest asset a family owns.

Here’s what I’ve learned watching this play out so many times: the emotional case for holding – loyalty to your employer, confidence in leadership, or simply not wanting to write a tax check – almost never lines up with the statistical case. History is full of companies that were consistent high performers and later suffered enormous declines. Intel, BlackBerry, and GE were all once considered unstoppable.  Nobody plans to be surprised by their company stock. It happens anyway.

None of this means concentration is a mistake. Betting big on one opportunity – your own company, your own judgment, your own hard work – is often exactly how meaningful wealth gets built in the first place. The issue isn’t that concentration is wrong. It’s that concentration and protection are two different jobs.  Wealth often becomes concentrated gradually—through years of grants, appreciation, or simply doing nothing—while protecting that wealth requires much more intentional decisions.

“Concentration risk” gets thrown around a lot, so here’s what it actually means:

• A single holding makes up an outsized share of your total net worth
• Your financial future – retirement, a home, your kids’ education – depends more on one company’s fortunes than it should
• A downturn in that one stock could materially change your financial plans.

None of that is a value judgment. It’s just a description of where a lot of successful people quietly end up.

The questions that actually matter

If you’re sitting on a concentrated position, a few questions tend to separate people who navigate it well from those who look back with regret:

• What would happen to your life if this stock dropped 50% tomorrow and didn’t recover?

Not “would that be painful?” – everyone knows it would be. The real question is whether it would change your timeline for retirement, your kids’ education, or your ability to keep your home. If the honest answer is yes, that’s good information, not a reason to panic. Ultimately, the question isn’t just how much of your wealth is in one stock. It’s how much of the life you’re planning depends on that stock continuing to perform.

• Are you holding this position because of genuine conviction, or because selling feels like a decision and holding feels like no decision at all?

Doing nothing is itself a choice – often the most expensive one, because it lets concentration build by default rather than by design.

• Do you understand the tax mechanics well enough to act with confidence?

Incentive stock options, blackout windows, holding periods for long-term capital gains treatment – the rules are genuinely complicated, and the cost of a wrong assumption can run into six figures. Plenty of people have been blindsided by an Alternative Minimum Tax bill they didn’t see coming, or missed a narrow exercise window after leaving a job.

• Have you separated your belief in the company from your allocation to it?

You can think your employer has a bright future and still decide that 40% of your net worth in one stock is more than that belief justifies. Those are two separate decisions and conflating them is one of the most common ways concentrated positions get mismanaged.

What an intentional plan actually looks like

The good news: none of this requires an all-or-nothing choice between “hold everything” and “sell everything.” There’s a wide middle ground, and the right approach depends on your specific situation – your tax bracket, your other assets, whether the stock is public or still private, and how much of your life depends on the outcome.

In practice, that might mean:

• A gradual, rules-based selling strategy that diversifies over time rather than all at once
• A preset trading plan, so decisions are made on a schedule instead of in the heat of the moment
• Strategically exercising options over several years to manage tax exposure
• Using charitable giving to help diversify a low-cost-basis position while supporting causes you care about
• For pre-IPO stock, exploring liquidity or diversification strategies before a public listing

What these strategies have in common: they work best set up before the pressure is on – not after a lockup expires, not with a tender offer closing in three days, not when a job change triggers a 90-day options deadline. The earlier you start, the more options you have.

Why this isn’t a do-it-yourself project

Managing a concentrated position sits at the intersection of investment risk, tax strategy, and, frankly, psychology. It’s the kind of problem where a spreadsheet can tell you the math, but it takes real judgment (and wisdom) – from someone who isn’t emotionally attached to the stock – to weigh that math against your goals, your risk tolerance, and the life you’re trying to achieve or protect.

A good advisor isn’t there to tell you to sell everything tomorrow—or to shrug and tell you concentration is fine because the stock has been going up. A good advisor will help you:

• understand exactly what you’re holding,
• what it would actually cost you in taxes to change it, and
• what a sensible, unhurried path toward more resilience looks like for your specific circumstances – not a generic one.

So, back to the question my client asked me: how do you not blow this? You don’t figure it out alone, and you don’t figure it out in a hurry. You build a plan before you need one.

If you’re sitting on a concentrated stock position – from a public company, a pre-IPO employer, or anywhere else – and you’ve been meaning to think it through but haven’t quite gotten there yet, that conversation is worth having sooner rather than later. We’d welcome the chance to be a sounding board.