You Vested a Fortune in One Stock. Now What?

Henry Supinski, ChFC® · 4 min read · July 2026

If a big chunk of your net worth sits in your employer's stock, you didn't necessarily choose that. It happened one vest at a time. Here's how to think clearly about reducing that risk without a rushed, tax-inefficient sale.

Concentration Sneaks Up on You

Nobody wakes up one day and decides to put 40% of their net worth into a single stock. It happens gradually, one vesting event at a time, while the share price quietly climbs. By the time it's a problem, it's also the best-performing asset you own, which makes it psychologically hard to touch.

A Rule of Thumb, Not a Rule

A common guideline is to keep any single stock position under 10% to 15% of your investable net worth. That's a starting point, not a mandate. The right number for you depends on your other assets, your risk tolerance, your conviction in the company, and how much of your future income (salary, bonus, and future grants) is already tied to the same employer.

Ways to Reduce Concentration Without a Single Painful Tax Bill

• Sell in stages over multiple years to spread the capital gains across tax brackets.
• Direct new vests to cash and rebalance, rather than selling old shares with more embedded gain.
• Use a 10b5-1 plan to automate the selling and remove the temptation to time it.
• Consider donating highly appreciated shares to a donor-advised fund if charitable giving is part of your plan.
• For very large positions, exchange funds can diversify exposure without triggering an immediate sale. And if the stock sits inside your 401(k), read about net unrealized appreciation before any rollover.

The Question That Actually Matters

Would you buy this stock today, with cash, if you didn't already own it? If the answer is no, the reason you're still holding it is usually inertia or a fear of the tax bill, not conviction. A plan built around your whole financial picture, not just this one stock, is the way out of that loop.

Which Shares to Sell First

Not all of your shares carry the same tax bill. RSUs that vested recently have a cost basis close to today's price, so selling them creates little or no gain. Shares from vests three or four years ago usually carry the most embedded gain. A sensible sell-down starts with the newest lots and works backward. You reduce risk immediately and defer the expensive gains until you can pair them with something useful, like a loss harvested elsewhere in the portfolio or a lower-income year.

Charitable gifting fits here too. If you already give to charity, giving appreciated shares instead of cash removes the embedded gain entirely, and a donor-advised fund lets you bunch several years of giving into one deduction. For qualified investors with very large positions, exchange funds can swap concentrated stock for a diversified basket without an immediate sale, though they come with long lockups and fees that deserve real scrutiny.

A Hypothetical, With Numbers

Round numbers, invented for the example, but the shape of the problem is real. Say a software executive has $2.5 million of investable assets and $1 million of it sits in employer stock with a $400,000 cost basis. Selling everything this year would realize $600,000 of long-term gain in a single tax year, stacking capital gains tax, the net investment income tax, and possibly a higher Medicare premium two years later.

Now run it differently. She sells $200,000 of stock a year for five years, starting with the newest lots. She directs every new vest to sell at vest, so the position stops growing. She routes her annual charitable giving through appreciated shares. The same diversification happens, but the gains land in five tax years instead of one, and a meaningful slice of the gain never gets taxed at all. Nothing exotic. Just sequencing.

How We Approach It

I spent years at SAP with RSUs vesting on a schedule I had to plan around, an ESPP decision every period, and a net worth that quietly tilted toward a single stock. So this is not theoretical for me. When we work on a concentrated position, we start by measuring true exposure, including unvested grants and the paycheck that comes from the same company. Then we agree on a target range, write down a sell schedule you can actually follow, and coordinate the whole thing with your tax picture. If you work at SAP specifically, we've written about the SAP concentration problem and the diversification playbook we use for it.

Questions We Hear

Won't selling trigger a huge tax bill?

You only pay tax on the gain, not the full sale amount. Recently vested shares often have almost no gain, so the first stage of a sell-down can be surprisingly cheap. The point of staging sales over several years is to keep any single year's bill manageable.

What if the stock keeps going up after I sell?

It might. Diversification is not a bet that your company will do badly. It's an acknowledgment that nobody knows, and that your salary, bonus, and future grants already ride on the same outcome. The goal is a plan that holds up across the full range of outcomes, not one that maximizes a single path.

Are exchange funds worth it?

Sometimes, for qualified investors with very large, low-basis positions. You contribute shares, receive an interest in a diversified basket, and defer the gain. The tradeoffs are real: multi-year lockups, fees, and limited control. They're a tool for a specific situation, not a default answer.

How fast should I sell down?

There's no universal number. The bigger the position relative to your net worth, the more the risk argument outweighs the tax argument. We usually land on a written schedule of one to five years, adjusted for your tax brackets, your vesting calendar, and how much sleep the position is costing you.