Concentrated Stock Risk: How Tech Employees Can Diversify

You joined a big tech company, RSUs vested over four years, and the stock did well. Then you got another grant. And another. Now $600,000 — maybe $1.2M — of your net worth is sitting in a single company's stock. That's the tech equity trap: compensation that builds wealth and concentration risk at the same time.

This guide walks through how to think about concentration, what it actually costs in taxes to fix it, and the strategies that senior tech employees use to diversify without a one-year tax catastrophe.

Why concentration happens — and why it's riskier than it looks

At a typical FAANG company, a senior IC's total comp can be 50–70% equity. Vesting compounds: four-year cliffs become perpetual grants, and if the stock performs, the unrealized appreciation adds to the position faster than you sell. Add ESPP shares on top and you can easily end up with a single-stock position worth several multiples of your annual salary — all in the same company you depend on for that salary.

The risk isn't just price volatility. It's correlation:

• If your company has a bad quarter, your stock drops and layoffs become more likely. Your financial safety net and your income source both degrade simultaneously.
• If your industry has a downturn (2022 tech selloff, 2000 dot-com bust), most of your peers in the sector face the same dynamics at the same time. Diversified investors don't.
• A single piece of bad news — an SEC investigation, an earnings miss, a CEO departure — can move a single stock 20–30% in a day. Broad indexes rarely move more than 2–3%.

Studies consistently show that concentrated single-stock positions underperform diversified portfolios on a risk-adjusted basis over long horizons. Employees who held Enron, Lehman, or WorldCom stock in their retirement accounts learned this firsthand. The same dynamics apply to any concentrated holding, even at profitable companies.

The tax cost of diversifying

Here's the tension: selling appreciated stock is a taxable event. A tech employee with 10,000 shares at a $50 cost basis selling at $120/share has a $700,000 long-term capital gain. In California:

For a California-based senior engineer with $400K in base + bonus and a $700K long-term gain, the combined federal (20% + 3.8%) + state (13.3%) rate is roughly 37% on the gain. That's $260,000 in taxes to diversify a $700,000 position. Painful — but consider the alternative: a 30% stock decline destroys $210,000 of that position with zero offsetting tax benefit if you had no losses to harvest against it. Paying taxes to diversify is almost always the right economic decision when concentration is high; the question is how to minimize the tax drag.

Strategy 1: Systematic selling with tax-aware lot selection

The simplest approach: sell a fixed percentage of your position each quarter, using specific lot identification to optimize taxes.

Most brokerage platforms let you choose which tax lots to sell. The options:

• High-cost lots first: Sell shares with the highest cost basis first. This minimizes your taxable gain on each sale. Works best when you want to reduce position size quickly with the smallest immediate tax bill.
• Long-term-only lots: Ensure every sale is long-term (>12 months). Short-term gains are taxed at ordinary income rates — up to 37% federal — versus 15–20% LTCG. If you're 11 months into a vest, waiting one more month to sell can save 15–25 percentage points on that lot's gain.
• 0% bracket harvesting: In years where your taxable income drops below $48,350 (single) / $96,700 (MFJ) — a sabbatical year, a gap between jobs, or a year after leaving a company — you can realize long-term capital gains at 0% federal. If you ever have a low-income year, prioritize large sales in that year.

Strategy 2: 10b5-1 plans for insiders and restricted employees

A Rule 10b5-1 plan is a pre-arranged trading schedule set up at a time when you have no MNPI. The plan pre-commits to selling a defined number of shares at defined intervals or prices. Because the trades execute automatically according to a plan you set up in advance, they're protected from insider trading liability even if you later learn something that would otherwise have restricted your trading.

Practically: you work with your broker to establish the plan during an open window, specifying something like "sell 500 shares on the first trading day of each month for 24 months." Then you set it and forget it. The shares sell on schedule regardless of what you know or don't know at each execution date.

10b5-1 plans were subject to SEC rule changes in 2023 that added a mandatory cooling-off period: 90 days (or the next earnings release, whichever is later) for non-C-suite employees, and 120 days for officers and directors. You can no longer set up a plan and start selling immediately. The SEC's intent was to close a loophole where insiders would set up plans right before favorable announcements.

The mechanics have more nuance — single-trade plans, multiple-trade plans, and the right to cancel all have different rules — which is one of the reasons an advisor who works with tech employees in similar situations is useful here.

Strategy 3: Tax-loss harvesting to offset gains

If your overall portfolio has positions with unrealized losses — other individual stocks, sector ETFs you bought at a high, international funds that underperformed — you can sell those at a loss and use the losses to offset the capital gain from selling your concentrated position. A $100,000 capital loss from one position directly offsets $100,000 of capital gain from another.

Important mechanics:

• Wash-sale rule (IRC §1091): You can't sell a security at a loss and buy it back within 30 days before or after the sale. If you want to stay invested in the sector, buy a similar but not identical fund (e.g., sell a tech-sector ETF and buy a different tech-sector ETF) during the 30-day window.
• $3,000 annual ordinary income offset: If your capital losses exceed your gains, you can use up to $3,000/year of net loss to offset ordinary income. The rest carries forward indefinitely to future years.
• Short-term losses offset short-term gains first: Capital loss netting rules require you to match short-term against short-term and long-term against long-term before crossing over. This matters because a long-term loss used to offset a short-term gain is worth more (short-term gains are taxed at higher rates).

Strategy 4: Exchange funds

An exchange fund is a private partnership that allows you to contribute concentrated shares and receive a proportional interest in a diversified pool of securities contributed by other investors — without triggering a taxable sale at the time of contribution.

The tax deferral comes from IRC §721, which treats contributions of appreciated property to a partnership as non-taxable. Your basis in the fund equals your basis in the original shares; no gain is recognized until you receive a distribution.

The key restriction: to qualify for tax-deferred treatment, you must hold your interest in the exchange fund for at least 7 years before receiving a diversified distribution.³ Early withdrawals are available but typically trigger gain recognition on the appreciated amount.

Additional requirements and tradeoffs:

• Exchange funds must hold at least 20% of their assets in "qualifying" illiquid assets (typically real estate) to satisfy IRS requirements. This creates some illiquidity and return drag.
• These are private funds with accredited investor requirements — typically you need a minimum contribution of $500K–$2M and you're dealing with fund managers who charge management fees.
• Your basis is "inherited" from your original shares, so when you eventually sell fund shares, you'll owe capital gains on the accumulated appreciation minus your original basis.
• You're diversified during the 7-year hold but cannot easily exit. If you need liquidity, exchange funds are not the right tool.

Exchange funds make the most sense for very large concentrated positions (multi-million dollar holdings) with very low basis — where the tax cost of outright selling is prohibitive and the 7-year illiquidity is manageable.

Strategy 5: Charitable strategies — DAF and CRT

Donor-Advised Fund (DAF)

If you have any charitable intent, donating appreciated stock to a Donor-Advised Fund is one of the most tax-efficient moves available. The mechanics:

• You contribute shares directly to the DAF — not cash. The DAF receives the shares and immediately sells them.
• You get a charitable deduction for the full fair market value of the shares at the time of donation.
• You pay zero capital gains tax on the appreciation.
• The DAF holds the proceeds and you direct grants to charities of your choice over time.

Example: 500 shares with a $5,000 basis, current value $50,000. If you sell and donate: you owe $45,000 × ~37% combined tax = ~$16,650 in tax, then donate the remaining ~$33,350. If you donate the shares directly to a DAF: you get a $50,000 charitable deduction, pay zero capital gains, and the full $50,000 ends up supporting charity.

AGI limitations: deductions for appreciated property donated to a DAF are limited to 30% of your AGI in the year of donation, with a 5-year carryforward for excess amounts.⁴ If you're donating a very large position, you may spread the contribution across multiple years to fully utilize the deductions.

Charitable Remainder Trust (CRT)

A CRT is a more complex structure for very large positions (typically $1M+) where you want both charitable giving and an income stream:

• You contribute appreciated shares to the CRT. The CRT sells them tax-free and reinvests in a diversified portfolio.
• The CRT pays you (or a named beneficiary) an annuity or unitrust payment each year, typically for your lifetime or a defined term.
• At the end of the trust term, the remaining assets pass to charity.
• You get an upfront charitable deduction for the present value of the remainder interest.

CRTs work well when you have a large position you can't sell outright, genuine charitable intent for a portion of the estate, and a need for income. They're irrevocable — once you fund the CRT, you can't get the assets back.

Strategy 6: Collars and other hedging strategies

An equity collar involves buying a protective put (which caps your downside) and selling a call (which funds the put premium by giving up some upside). This lets you stay long the stock while limiting the range of outcomes.

The tax complexity: IRC §1259 (constructive sale rules) says that if you effectively lock in a gain by eliminating substantially all risk of loss and opportunity for gain, you've constructively sold the position and must recognize the gain immediately.⁵ A tight collar — where the put and call strikes are close together — can trigger this. A wider collar that still allows meaningful appreciation and significant downside risk generally does not, but the line is not bright and the IRS has authority to challenge aggressive structures.

Additionally: the put option you buy to protect a long-term position may suspend or restart your holding period for LTCG treatment on the underlying shares, depending on the specifics. Collars are structurally complex enough that you want an advisor involved before executing one.

That said, collars can be a useful tool when:

• You're in a lock-up or blackout period and can't sell but want downside protection
• You have a known future liquidity need (down payment, large purchase) and want to reduce the risk that the stock falls before you can sell

When it's OK to stay concentrated

Not every concentration is a problem. Staying concentrated makes more sense when:

• You're still on an active vesting schedule. If you're 2 years into a 4-year grant and the stock is performing, the expected value of future grants may justify holding current shares at some risk. Selling to diversify while continuing to receive concentrated comp just recycles the concentration.
• Your position is small relative to your liquid savings. If your company stock is 20% of your net worth and you have substantial other investments, the concentration risk is manageable without aggressive action.
• The basis is low and the holding is long-term. If you have a very low basis and the stock has a long history of appreciation, the economic argument for holding gets stronger. The question is whether the tax cost of selling is higher or lower than the expected cost of the remaining concentration risk.

The threshold that most financial planners use: if more than 10–15% of your investable net worth is in a single stock, the concentration is worth actively managing. Above 30%, it becomes a first-order financial planning priority.

The planning challenge: all these strategies interact

A common scenario: a senior engineer with $800K in company stock (low basis), $200K in other brokerage assets, a 401(k), and a charitable intent of $50K/year. Do you sell systematically, donate some to a DAF, do a collar while you're in a lock-up, set up a 10b5-1 plan? The answer depends on your income this year and next, your actual charitable priorities, whether you're an insider, your state of residence, your existing retirement account balances, and your time horizon.

None of these strategies is wrong in isolation. The issue is that they interact: a large DAF donation changes your taxable income, which changes which LTCG bracket you land in, which changes whether systematic selling in the same year makes sense. Optimizing one variable without modeling the full picture produces suboptimal results.