Kestrel Bay Retirement Advisors says how much company stock is too much usually comes down to one line: once a single stock passes about a fifth of your net worth, diversifying comes first. A 50% drop in a stock that is 40% of a $2 million net worth costs $400,000, and getting back to even then takes a 100% gain.
This article is mostly for tech employees whose RSUs, options and ESPP shares have piled into one ticker, often without a decision ever being made. If your employer stock is under a tenth of what you own, you can skim the first half and go straight to the checklist near the end.
The Kestrel Bay Retirement Advisors team wrote it with the tax side in mind, because the tax on a sale is usually what keeps people frozen.
What does a 50% drop cost at 20%, 40% and 60% in one stock?
Start with the numbers, because they settle most arguments. On a hypothetical $2 million net worth, a 50% fall in one stock costs $200,000 when the stock is 20% of the total, $400,000 at 40% and $600,000 at 60%. Everything else in the portfolio is assumed to stay flat.
Look at how the loss scales. Double the position and you double the damage. At 20%, you end up at $1.8 million, a 10% dip you'd feel but recover from. At 60%, you're at $1.4 million, and a 30% haircut to everything you own.
Recovery is the part people forget. A 50% loss needs a 100% gain to get back to even, and a 30% loss needs about 43%. Investing involves risk, including loss of principal, and a single stock carries company-specific risk that a diversified fund does not.
| Stock share of net worth | Value in stock | Loss in a 50% drop | Net worth after |
|---|---|---|---|
| 20% | $400,000 | $200,000 | $1,800,000 |
| 40% | $800,000 | $400,000 | $1,600,000 |
| 60% | $1,200,000 | $600,000 | $1,400,000 |
The mistake: waiting for a better price or a smaller tax bill
The pattern is familiar. The stock has run, the gain is big, and you tell yourself you'll sell after it recovers, or after the next vest. But if the stock keeps climbing, waiting doesn't shrink anything. The position gets bigger as a slice of what you own.
Before Kestrel Bay Retirement Advisors suggests any sale, we estimate the tax on it, then set a pace. We do it in that order because the tax on selling is a known number, and the cost of a drop isn't.
Here's the price of getting it wrong. At 40% of a $2 million net worth, a 50% drop costs $400,000. That's more than many households pay in federal tax across several years of staged sales.
So the fix is plain. Pick a target share and a date. Don't pick a price.
Where is the line? A rule you can use this week
If more than about a fifth of your net worth is in one company, diversifying usually comes before your other goals. Between 10% and 20% is a judgment call. Under 10% is rarely urgent.
Count more than the shares in your brokerage account. Include vested shares, unvested RSUs you expect to keep, option spread before tax, ESPP shares and any company stock fund inside the 401(k). Most people who think they're at 15% find they're nearer 30% once everything is added.
It's a judgment call, and we lean early. We'd rather you trim at 25% than wait until 50%, because tax on a gain is a cost you can plan around and a crash is not.
One exception: a house or a private business you can't easily sell is measured on its own. And a big option spread can fall faster than the stock itself, since the strike price doesn't move.
How does the right amount shift with your age and net worth?
Under 40, with a long runway, 20% is a ceiling to reach over a few years. A loss would hurt, but you have decades of paychecks to rebuild. In your 50s, the same 20% is a stricter limit. There's little time to earn it back, and if you need withdrawals in a down year, the loss gets locked in.
Size matters too. With $400,000 total, a 40% position is $160,000, which is a big bite out of the savings you actually have. At $5 million, you can carry a larger dollar amount without risking your lifestyle.
Still, a position that's large in dollars is large against one employer's fortunes, no matter how rich the rest of you looks.
Jonah and Mei size up the options they hold
Hypothetical: Jonah and Mei, 46 and 44, have a $2,000,000 net worth. It's $900,000 of option spread at his chip maker, $300,000 in a brokerage account, $450,000 in 401(k)s and $350,000 of home equity. (We left Mei's startup shares out for simplicity.) The spread is 45% of the total: $900,000 ÷ $2,000,000.
Now stress it. If the spread fell 50%, they'd lose $450,000, which is 22.5% of net worth. Real option spread usually falls faster than the stock, so that's a mild test.
A fifth of $2,000,000 is $400,000. They hold $900,000, so $500,000 has to move. Spread over 4 years, that's $125,000 a year ($500,000 ÷ 4).
The tax order matters. Nonqualified options are ordinary income at exercise, so we price those first. Incentive options wait for an alternative minimum tax check before any exercise.
How to sell down in stages
Five steps get most people from a vague worry to a dated plan. Each one is small. The tax work in step 3 is where the time goes.
- Step 1: List every holding tied to your employer, including the 401(k) company stock fund and any startup shares, and add them up.
- Step 2: Divide that total by your whole net worth and hold the result against the 20% line.
- Step 3: For each lot, write down the tax if sold today: long-term gain after one year, ordinary rates at one year or less, ordinary income on an NSO exercise.
- Step 4: Set a yearly amount that keeps taxable income under the next bracket, and fix dates, such as a few days after each vest.
- Step 5: Put proceeds in a diversified fund. Sell 401(k) company stock first, since that creates no current income tax. If you're an insider, a 10b5-1 plan with its cooling-off period can schedule sales ahead of time.
Keep it or sell it: what each choice gives and costs
Keeping the stock means no tax bill now and a shot at more gains, and some people simply like feeling tied to the company's success. Long-term rates apply only after more than one year. The downside is that one company shock can hit your job, your bonus and your savings in the same month.
Selling down cuts the swings and frees cash for a down payment or tuition. The tax is paid at rates you can plan. But yes, that means paying some tax sooner, and you may miss further gains.
Neither is free. We think the known cost beats the unknown one at the sizes in this article.
- Keep: no tax now; upside stays; a 50% loss needs a 100% gain.
- Sell down: smoother ride; cash for goals; tax paid earlier; gains may be missed.
Myths about holding company stock, and how Kestrel Bay Retirement Advisors can help
"I know the company, so it's safer." Knowing the product doesn't remove price risk, and your salary leans on that same employer. "Selling always means a huge tax bill." Long-term gains are taxed at lower rates, losses can offset gains, and 401(k) sales aren't taxed now. "I'll sell when it's back at my high." The stock has no memory of your price.
The one-fifth line is a rule of thumb, not a law. Someone with a large pension, a paid-off house and a small slice in one stock may reasonably hold more, and insiders may face trading windows that limit dates.
Kestrel Bay Retirement Advisors works through these numbers with clients by video or phone, lot by lot, starting with the tax. If you have $400K or more invested, use the request form to ask for a first conversation.
- Total employer exposure as a percent of net worth
- Each lot's holding period and cost basis
- A dated sale schedule
- Whether the 401(k) holds company stock
- Whether a trading window or 10b5-1 plan limits your dates
Your questions about how much company stock is too much, answered
What percent of my portfolio should be in my employer's stock?
A common ceiling is about 20% of net worth in any one company, and many planners prefer 10% or less if you're near retirement. Your paycheck already ties you to the employer, so extra stock stacks the same risk. Pensions and low spending can justify more.
Does my 401(k) company stock fund count toward the limit?
Yes. Count it with vested shares, ESPP shares, unvested RSUs you plan to keep and option spread. Selling company stock inside the 401(k) creates no current income tax, so it's often the easiest place to cut first, though plan rules on trading vary.
How fast can I sell company stock without a large tax bill?
There's no single speed. Shares held over a year get long-term rates, while NSO exercises are ordinary income. Many people sell a set amount each year to stay under the next bracket, or just after each vest. A tax estimate for each lot sets the pace.
This information is general education only and does not account for your specific circumstances, goals or finances. It is not investment, tax or legal advice. Investing involves risk, including the possible loss of principal. Before making any financial decision, consult a qualified professional about your own situation.