Why Is Diversifying Concentrated Stock So Difficult?

Diversifying a concentrated stock position can be difficult because selling highly appreciated shares may trigger capital gains taxes, while continuing to hold them leaves more of your wealth tied to a single investment. A diversification strategy can take into account taxes, timing, retirement income, other investments, and your broader financial goals.

You may already know you own too much of one stock. The difficult part is deciding what to do about it.

Maybe it’s company stock you accumulated throughout your career. Maybe you bought shares years ago that performed far better than expected. Either way, the investment may now represent a much larger percentage of your wealth than you originally intended.

Selling sounds like the obvious solution, until you calculate the potential capital gains taxes. And if the stock is tied to your career, family history, or years of strong performance, the decision can become emotional as well as financial.

At SGL Financial, our Chicagoland financial advisors focus on helping clients evaluate concentrated stock within their complete financial picture rather than treating diversification as a stand-alone investment decision.

Why Can a Concentrated Stock Position Become a Problem?

Because one investment can begin to have too much influence over your financial future. Suppose you have a $2 million investment portfolio, with $800,000 invested in one company. That means 40% of your portfolio depends on what happens to a single stock.

If the stock falls 30%, that $800,000 becomes approximately $560,000, a $240,000 decline before considering changes elsewhere in your portfolio.

If you’re approaching or already in retirement, think about these questions:

• What would a significant decline in this stock mean for the rest of your financial plan?
• Would it affect your retirement date? 
• Would it affect your ability to fund withdrawals?
• Would it affect your willingness to sell during a downturn?
• Would it affect the amount you want to leave to your family?

Concentration risk isn’t simply about how much stock you own. It’s about how dependent your financial goals have become on that stock continuing to perform well.

Read our blog: “Could Today’s Spending Limit Tomorrow’s Choices?” 

Why Do Capital Gains Taxes Make Diversification Difficult?

Selling highly appreciated stock can create a significant taxable gain.

Suppose you invested $100,000 in a stock that is now worth $600,000. Selling the entire position could produce a $500,000 capital gain.

Depending on your taxable income and circumstances, some of that gain could be subject to federal long-term capital gains tax and potentially the 3.8% Net Investment Income Tax.

For Illinois residents, there is another consideration. Illinois generally taxes individual income at a flat rate, and capital gains are generally included in Illinois taxable income. Unlike the federal system, Illinois does not provide a separate preferential state tax rate for long-term capital gains.

That creates a tradeoff.

Holding the stock avoids realizing the gain today but maintains your concentration. Selling reduces your dependence on the investment but may accelerate taxes.

Taxes matter, but so does the financial risk you are accepting to defer them.

Working together, our Chicagoland financial planners and dedicated tax professionals model both sides of the decision so you can compare the potential tax cost of selling with the financial implications of remaining concentrated.

Listen to our podcast episode: “Your Financial Pain Points.”

Why Is Employer Stock So Hard to Sell?

Employer stock can be particularly difficult to sell because the decision is rarely based on investment considerations alone.

If you spent decades building a career with a company, its stock may feel closely tied to your professional success. You may know the business well, believe strongly in its future, and have watched the stock appreciate over many years. Selling can feel like giving up an investment that has rewarded you or betting against the company that helped build your wealth.

There may also be financial reasons to hesitate. A highly appreciated position can carry significant unrealized capital gains, while equity compensation, vesting schedules, trading windows, or company policies may affect when and how shares can be sold.

At the same time, continuing to hold a large position can increase your financial dependence on a single company. If you still work there, your salary, bonus, benefits, future equity compensation, and investments may all be tied to the same employer. A company downturn could therefore affect several parts of your financial life at once.

The challenge is not simply deciding whether to sell. It is determining how much employer stock makes sense to retain and developing a strategy to reduce concentration while considering taxes, investment risk, compensation, and your broader financial goals.

Should You Sell All Your Concentrated Stock Immediately?

Diversification does not always require selling the entire position at once. There is a big difference between determining that you own too much of one stock and deciding that every share needs to be sold today.

Think of diversification more like turning a dial than flipping a switch. You may be able to gradually reduce the position over several months or tax years while evaluating the tax consequences associated with each sale.

The important point is that gradual diversification should still have a purpose. Simply postponing the decision indefinitely because you don’t want to realize a gain isn’t the same as having a strategy.

A staged strategy can be appropriate when selling everything at once would create substantial tax consequences or conflict with other parts of your financial plan.

Depending on your circumstances, a retirement planning professional may evaluate approaches such as:

• Selling shares across multiple tax years rather than realizing one large gain.
• Coordinating sales with years when your taxable income may be lower.
• Directing new portfolio contributions away from the concentrated company or sector.
• Rebalancing other investments around the position while it is gradually reduced.
• Using appreciated shares for charitable gifts when charitable giving is already part of your plan.
• Coordinating sales with retirement, business transitions, or other significant income changes.

That doesn’t mean waiting is automatically better. It means timing is part of the diversification decision.

Check out our blog: “Has Your Portfolio Drifted From Your Risk Tolerance?”

How Do You Balance Concentration Risk With Taxes?

It’s easy to focus on taxes because the potential bill is visible. Concentration risk is less obvious because the cost only becomes clear if the stock declines.

Consider someone reluctant to realize $100,000 of taxable gains because of the taxes associated with selling. The tax cost is important, but what if avoiding that tax means continuing to hold a position that represents 40% or 50% of the portfolio?

A better analysis compares multiple scenarios:

Your objective with this type of comparison isn’t simply to minimize taxes. It’s to understand what you receive, and what financial exposure remains, in exchange for the taxes you choose to defer.

How Should Diversification Fit Into Your Retirement Plan?

Diversifying concentrated stock should be evaluated within your complete retirement and financial plan, not as an isolated investment decision.

At SGL Financial, we can help you evaluate a concentrated stock position alongside your retirement timeline, income needs, other investments, and tax situation to develop a comprehensive wealth management plan. Ready to discuss your financial situation in more detail?

If you’re unsure how a concentrated position fits into your financial future, schedule a complimentary review with our team at SGL Financial. There’s no upfront cost to discuss your situation, ask questions, and learn more about your options.

Frequently Asked Questions About Concentrated Stock

What Percentage Of One Stock Is Too Much?

There is no single percentage that applies to everyone. A position becomes more concerning when a decline could materially affect your retirement income, financial goals, or overall portfolio. The appropriate level depends on your other assets, income sources, time horizon, tax situation, and ability to tolerate losses.

Do I Have To Sell Concentrated Stock To Diversify?

No. Diversification does not always require an immediate or complete sale. Depending on your circumstances, shares may be reduced over time while other investments, new contributions, charitable gifts, and tax considerations are incorporated into the strategy.

Can I Reduce Concentrated Stock Without Paying Capital Gains Tax?

Selling appreciated stock in a taxable account generally realizes a capital gain. However, the timing and size of sales, available losses, charitable giving strategies, and other tax factors may affect the ultimate tax impact.

Should I Wait Until Retirement To Sell Appreciated Stock?

Not automatically. Your income may decline after retirement, potentially changing the tax calculation, but waiting also means remaining concentrated longer. Comparing projected tax and portfolio scenarios can help determine whether selling before, during, or after retirement is worth considering.

Is Employer Stock Riskier Near Retirement?

If employer stock represents a large portion of your portfolio, a major decline could affect assets you may soon need for retirement. If you still work for the company, your paycheck and investment wealth may also depend on the same employer.

Can A CERTIFIED FINANCIAL PLANNER® Professional Help With Concentrated Stock?

Yes. A CFP® professional can evaluate a concentrated position in relation to your investment allocation, retirement income, taxes, liquidity, estate considerations, and financial goals rather than evaluating the stock in isolation.