How Much Company Stock Is Too Much in My Portfolio?
Last reviewed: July 2026
Any single stock position above 10% to 15% of your portfolio is generally too much, and employer stock is riskier still because your paycheck, benefits, and career already depend on that same company. Equity concentration risk is the danger of tying too much of your wealth to one stock's fate. When that stock is your employer's, a single bad quarter can hit your portfolio and your job at the same time.
Key Takeaways
- A single stock position above 10% to 15% of your portfolio is generally considered too concentrated by financial advisors.
- Employer stock concentration is uniquely dangerous because your salary, benefits, and net worth all ride on one company.
- The IRS taxes long-term capital gains at 0%, 15%, or 20% in 2026, which shapes how you unwind a position.
- Selling concentrated shares gradually over time spreads tax impact and reduces single-stock exposure without one large tax bill.
About the Author: Jeff Judge, CFP®, AEP®, ChFC®, CLU® is Managing Partner of Chesapeake Financial Planners in Forest Hill, Maryland. He has been helping families and business owners in Harford County and the Baltimore metro area navigate equity compensation and concentrated stock decisions since earning his CFP® certification in 2013, by using Chesapeake Financial Planners’ signature process, the R.U.D.D.E.R. method™. Jeff often tells clients that the hardest part of selling employer stock isn't the math, it's admitting the share price has been doing your thinking for you.
What Is Equity Concentration Risk?
Equity concentration risk is the danger of tying too much of your net worth to a single stock, most often your employer's. Most advisors flag any single holding above 10% to 15% of a portfolio as a concentration problem. Yet it's common for employees with restricted stock units to drift to 30%, 40%, or even higher without noticing.
Concentration builds quietly. RSUs vest on a schedule, and if you never sell at vest, the position compounds on its own. You believe in the company, so selling feels like betting against your own team. You worry about taxes, since holding longer than a year from vest qualifies for long-term capital gains rates. And inertia does the rest, because holding requires no action at all.
Every one of those reasons is emotionally honest. None of them changes the underlying problem: your financial security should not depend entirely on one company's success. Jeff Judge has watched clients ride a position from comfortable to dangerous in eighteen months, simply because the stock kept climbing and nobody wanted to be the one to sell.
Why Employer Stock Concentration Is Uniquely Dangerous
Concentrating wealth in any single stock is risky. Concentrating it in your employer's stock is worse, because your human capital and your financial capital point at the same company. When the company thrives, everything goes right at once. When it struggles, everything suffers at once.
Look at what already rides on your employer:
- Your salary. A company in trouble cuts headcount. Your income can stop without warning.
- Your equity comp. RSUs and options are only worth what the stock is worth. A crash erases future compensation, not just past gains.
- Your benefits. Healthcare, the 401(k) match, and leave policies all depend on staying employed.
- Your net worth. If 40% of your wealth sits in employer stock, a 50% decline removes 20% of your total net worth from one holding.
That bundled exposure is the real hazard. A diversified investor who loses a job still has a portfolio working independently of that paycheck. The concentrated employee gets the income shock and the portfolio shock in the same news cycle. History is full of examples, from Enron employees who held company stock in their 401(k)s and lost jobs and savings together, to the 2022 and 2023 tech layoffs that paired falling share prices with mass headcount cuts.
How Much Employer Stock Is Too Much?
There's no single magic number, but the working guideline is clear. Treat anything above 10% to 15% of your investable net worth in a single stock as a position that needs a plan. Above 20%, the risk dominates your financial picture. Above 30%, you are effectively running an undiversified portfolio whether you call it that or not.
The right target depends on your full situation. Someone five years from retirement with a paid-off house can tolerate less single-stock risk than a 30-year-old with decades of earning ahead. But the direction is always the same: bring the position down toward a band you'd be comfortable holding if the stock fell by half tomorrow.
This is where a structured process helps. The R.U.D.D.E.R. Method™ is Chesapeake Financial Planners' six-step planning process: Review and Recognize, Uncover and Understand, Design and Develop, Discuss and Decide, Execute and Empower, and Reassess and Refine. Applied here, it forces you to name the position honestly, decide on a target allocation, and execute a sell-down on a schedule instead of waiting for a price you'll never feel ready to act on.
How Much of My Portfolio Should Be in One Stock?
How to Diversify a Concentrated Stock Position
Diversifying employer stock is mostly about removing emotion and replacing it with a plan. A few approaches work in practice:
- Sell at vest. Treat each RSU vest as cash you happened to receive in stock, then redeploy it into a diversified portfolio. This stops new concentration before it starts.
- Set a calendar-based sell schedule. Selling a fixed dollar amount or fixed percentage on set dates removes the urge to time the perfect exit.
- Harvest gains across tax brackets. Coordinate sales with your taxable income so more of the gain lands in lower long-term capital gains brackets. According to the IRS, long-term capital gains are taxed at 0%, 15%, or 20% in 2026 depending on taxable income, so timing matters.
- Use tax-loss harvesting elsewhere. Losses from other holdings can offset gains realized when you trim the concentrated position.
A 10b5-1 plan is worth knowing about too. The SEC finalized updated rules for these pre-arranged trading plans in 2023, and they let insiders sell on a preset schedule even during periods when they hold material information. For executives subject to trading windows, that structure turns "I can't sell right now" into a problem with a real solution.
How does equity compensation affect my financial plan?
Frequently Asked Questions
How much of my portfolio should be in one stock?
Financial advisors generally recommend that no single stock exceed 10% to 15% of your investable portfolio. Above that threshold, one company's performance starts to drive your overall results. Employer stock deserves an even tighter limit because your income and benefits already depend on the same company's health.
Is 30% of my net worth in company stock too much?
Yes, 30% in a single company's stock is well above the 10% to 15% range most advisors consider prudent. At that level, a 50% drop in the stock would erase roughly 15% of your net worth from one holding. Combined with the income risk of being employed there, that concentration warrants a structured sell-down plan.
What are the tax consequences of selling RSU shares?
Selling RSU shares held longer than one year from vesting triggers long-term capital gains tax, taxed at 0%, 15%, or 20% in 2026 per the IRS, based on your taxable income. Shares sold within a year of vesting face higher short-term rates. Spreading sales across years can keep more gains in lower brackets.
Should I keep employer stock if I believe in my company?
Believing in your company is reasonable, but it doesn't change the risk math. Your salary, benefits, and career already bet on that company's success. Holding a large stock position on top of that stacks the same risk three times. Trimming to a comfortable band lets you stay invested without betting your entire financial life on one outcome.
What is a 10b5-1 plan and can it help me diversify?
A 10b5-1 plan is a pre-arranged trading schedule that lets company insiders sell shares at preset times, even during blackout periods, under SEC rules updated in 2023. It helps executives and insiders diversify steadily instead of waiting for an open trading window. The schedule removes both timing temptation and the appearance of trading on inside information.
Where to Go From Here
The hardest part of fixing a concentrated position is starting, because no exit price ever feels obvious. A simple, written sell-down schedule solves that better than waiting ever will. If you want a clear-eyed look at your own concentration and a tax-aware plan to unwind it, our guide on managing equity compensation walks through the full process. Download it at chesapeakefp.com.
Disclosures
The information provided is for educational purposes only and should not be construed as investment advice. Investment strategies should be tailored to individual circumstances, risk tolerance, and goals. Past performance doesn't guarantee future results. Consult with qualified financial professionals regarding your specific situation.
Advisors associated with Chesapeake Financial Planners may be either (1) LPL Financial Registered Representatives offering securities through LPL Financial, Member FINRA and SIPC, and investment advisor representatives offering investment advice through Great Valley Advisor Group; or (2) solely investment advisor representatives offering investment advice through Great Valley Advisor Group and not affiliated with LPL Financial. Great Valley Advisor Group, and Chesapeake Financial Planners are separate entities from LPL Financial.
