Diversifying Concentrated Company Stock: Risk and Tax-Aware Approaches

Years of vesting Restricted Stock Units (RSUs), exercised options, and Employee Stock Purchase Plan (ESPP) shares tend to accumulate into a single large position in your employer's stock. For successful Atlanta technology professionals, that position can grow to represent a substantial share of total net worth, often without a deliberate decision to make it so. A concentrated holding carries company-specific risk that a diversified portfolio does not, yet unwinding it usually means recognizing capital gains. This guide explains the nature of single-stock risk, outlines staged and tax-aware approaches to reducing concentration, and notes where structured selling plans fit.

Why Single-Stock Concentration Is Risky

A diversified portfolio spreads capital across hundreds or thousands of companies, so the failure of any one has a limited effect on the whole. A concentrated position reverses that logic: when one stock represents 20%, 40%, or more of your investable assets, your financial outcome depends heavily on a single company. Company-specific events, such as a competitive disruption, a regulatory action, a failed product cycle, or a management misstep, can sharply reduce the value of a concentrated holding even while the broader market rises. This is risk that diversification is specifically designed to reduce, and it is not compensated: investors are generally not rewarded with higher expected returns for bearing risk they could have diversified away.

The Trade-Off, Stated Honestly

Concentration is not purely negative, and treating it as such would oversimplify the decision. A concentrated position in a company that performs well can produce outsized gains, which is precisely how many technology employees build significant wealth in the first place. The question is not whether concentration can pay off, because it can, but whether continuing to carry that level of company-specific risk fits your goals once the position has grown large relative to your net worth. Diversifying trades the possibility of further outsized gains for a reduction in the risk that a single company's decline derails your plans. Neither side of that trade is free.

Assessing How Much Concentration You Carry

Before deciding what to do, it helps to measure the exposure clearly. Concentration is usually expressed as the percentage of investable assets, or of total net worth, held in the single stock. A position that is 5% of a diversified portfolio raises few concerns; one that is 50% dominates the portfolio's behavior. There is no universal threshold that applies to everyone, because the appropriate level depends on your overall wealth, your other income, your time horizon, and how much volatility you can tolerate without altering your plans. What matters is making the level a conscious choice rather than an accident of accumulated vesting.

The Tax Cost of Diversifying

Reducing a concentrated position generally means selling appreciated shares, and selling appreciated shares generally triggers capital gains tax. The cost basis matters: RSU shares have a basis equal to the value taxed as income at vesting, while shares from an early option exercise may have a low basis and therefore a large embedded gain. Long-term gains (on shares held more than one year) receive preferential federal rates, while short-term gains are taxed as ordinary income, so holding period affects the bill. Georgia state tax applies on top. The federal capital gains rules and the Georgia individual income tax together determine the after-tax proceeds of any sale.

Staged Diversification

Selling an entire concentrated position at once recognizes all the embedded gain in a single tax year, which can push you into higher brackets and concentrate the tax cost. Spreading sales across multiple years, often called staged or programmatic diversification, addresses this by realizing gains gradually. The approach reduces the year-by-year tax impact and avoids the timing risk of selling everything on one date, at the cost of remaining partially concentrated for longer.

Tax-Aware Techniques

Beyond simply spreading sales over time, several techniques can reduce the net tax cost of diversifying or define risk while you hold. Each carries its own limitations, and none eliminates the underlying trade-off.

Pairing Sales With Harvested Losses

Capital losses harvested elsewhere in your portfolio can offset gains realized when you sell concentrated stock, reducing the net taxable gain. In a year with both, the loss directly lowers the tax on the diversification sale. The tax-loss harvesting guide explains the mechanics and the rules, including the wash sale rule that governs repurchasing similar securities.

Donating Appreciated Shares

If you are charitably inclined, donating highly appreciated shares to a qualified charity or a donor-advised fund can avoid the capital gains tax on the donated shares while providing a charitable deduction for their fair market value, subject to adjusted gross income limits. This redirects shares you might otherwise sell into a tax-efficient gift, though it only suits those who intend to give and permanently parts you from the donated shares.

Defining Downside While You Hold

For a position you are not ready to sell, a protective put establishes a price floor below which losses are limited for the option's term, in exchange for the premium paid. This defines downside risk without triggering a sale, but it has a real cost, a defined expiration, and tax and suitability considerations of its own. The protective put strategies guide covers how these work and where they fall short.

Structured Selling Plans (10b5-1)

Company insiders and employees with regular access to material non-public information often cannot simply sell shares whenever they choose. A Rule 10b5-1 trading plan is a written, predetermined arrangement that specifies in advance the amounts, prices, and dates of future sales (or a formula for them), adopted at a time when the person does not possess material non-public information. Because the trades are set in advance, the plan can provide an affirmative defense against insider-trading allegations and allows scheduled selling to continue even during periods when discretionary trading would be restricted.

For an employee diversifying a concentrated position, a 10b5-1 plan can be the mechanism that makes staged selling practical: it automates a predetermined schedule and removes the need to decide whether to trade during each open window. These plans are subject to specific regulatory requirements, including mandatory waiting periods before trading begins, and they are typically established with the involvement of the employer's legal or compliance function. The rules are detailed and have been updated over time, so anyone considering a plan should work through the current requirements with qualified legal counsel rather than relying on a general description.

Key Takeaways

Related Guides

Use these resources to round out your equity compensation and tax planning:

Additional Resources

• Protective Put Strategies: Defining downside risk on a position you are not ready to sell
• Strategic Portfolio Review: Place company stock within an overall allocation and Investment Policy Statement