What to do with vested RSUs: the diversification playbook for US employees

You just vested $120,000 of company stock. Your sell-to-cover handled the tax withholding, and the remaining shares are sitting in your brokerage account. Add the three prior vests you never got around to selling, the ESPP shares, and the unvested grants still coming, and a single stock — the same one that signs your paycheck — is now 40% of your investable net worth. The hardest part of RSU compensation is not the tax. It is what you do with the shares after they land.

The 30-second answer: Vested RSUs are taxed as ordinary income at vest, and your cost basis resets to the vest-date price — so selling at vest is close to tax-neutral and is the cheapest moment to diversify. The default play for most US employees is sell-at-vest down to a target allocation (commonly 10% to 15% of liquid net worth in any single stock) and redeploy into a broad index. If you want to keep the position, build a completion portfolio around it, use direct indexing to harvest losses elsewhere, and for very large low-basis stakes consider an exchange fund or a 10b5-1 plan to sell on a schedule. Concentration in employer stock is a bigger risk than the tax bill, because your salary and your shares move together.

This is the playbook for the moment the shares hit your account: how to size the position, how to unwind it tax-efficiently, and the specific tools — completion portfolios, direct indexing, exchange funds, and 10b5-1 plans — that turn a concentrated bet into a portfolio. It assumes you are a US resident filing a US return; the cross-border version for Indian residents is a different article.

Why employer-stock concentration is its own category of risk

Owning a lot of one stock is risky. Owning a lot of the stock that also pays your salary is a different, worse risk, because the two exposures are correlated. If your company has a bad year, the share price falls, your bonus shrinks, your next grant vests at a lower value, and the odds of a layoff rise — all at once. The diversification you actually need is across the thing you are most exposed to, and for most employees that single thing is their employer.

The numbers are not gentle. Individual large-cap stocks routinely draw down 40% to 70% in a single cycle even when the broad market falls far less. A diversified S&P 500 holder who lost 19% in 2022 had peers in single tech names down 50% to 65% in the same year. Concentration does not just raise volatility; it raises the chance that a single bad outcome is permanent, because you may be forced to sell at the bottom to cover living expenses after a layoff.

The reasonable ceiling most advisers use is 10% to 15% of liquid net worth in any one stock, and a deliberate, justified exception above 20% to 25%. Above that line, you are no longer investing — you are running an undiversified bet you did not consciously choose.

Worked example. Sizing the position and finding the dollars to sell

Abstractions do not move people; numbers do. Lay out your actual balance sheet, compute the single-stock percentage, then back into the dollars you need to sell to hit your target. Here is a representative mid-career engineer:

Account / asset	Value	Of which employer stock
Taxable brokerage (employer RSUs and ESPP)	$260,000	$260,000
401(k), broad index funds	$180,000	$0
Roth IRA, broad index funds	$40,000	$0
Cash and emergency fund	$40,000	$0
Employer stock held inside the brokerage	(included above)	—
Liquid net worth (excludes primary home)	$520,000	$260,000

Employer stock is $260,000 of a $520,000 liquid net worth — exactly 50% in one name. Set a target of 15%. The target dollar amount you want to keep is 15% × $520,000 = $78,000. The amount to sell is $260,000 − $78,000 = $182,000.

A subtlety worth naming: as you sell employer stock and redeploy into a diversified index, liquid net worth stays roughly the same (you are swapping one asset for another, less any tax), so the 15% target dollar figure barely moves. Sell down to roughly $78,000 in the single name and stop. That number — the dollars over your line — is the entire job. Everything below is about doing it tax-efficiently.

Bottom line: Employer-stock concentration is correlated with your paycheck, so it is a worse risk than ordinary single-stock risk; size any one name to 10% to 15% of liquid net worth, and compute the exact dollars over your line before you do anything else.

The cheapest moment to diversify is the vest itself

Here is the piece of tax mechanics that makes this easy. When RSUs vest, the fair market value of the shares is added to your W-2 Box 1 as ordinary income, and your cost basis is set to that same FMV. You owe the ordinary income tax on the vest value whether you keep the shares or sell them. So if you sell on the day of vest, the capital gain is essentially zero — there has been no time for the price to move away from your basis.

That means a sell-at-vest is close to tax-neutral, and every day you hold afterward is a fresh, deliberate decision to keep a concentrated position with embedded gains that will cost real tax to unwind later.

Worked example. Sell at vest vs hold and sell later

You vest 1,000 shares at $120. The vest event puts $120,000 of ordinary income on your W-2 regardless of what you do next.

Scenario A — sell all at vest. You sell 1,000 shares at $120. Proceeds $120,000, cost basis $120,000, capital gain $0. Total extra tax from the sale: $0. You now hold $120,000 in cash to diversify.

Scenario B — hold 18 months, then sell at $150. Proceeds $150,000, cost basis $120,000, long-term capital gain $30,000. At a 15% LTCG rate plus 3.8% Net Investment Income Tax (NIIT), that is 18.8% on $30,000 = $5,640 in tax. You netted more because the stock rose, but you also carried 18 months of single-name risk to get there, and if the stock had fallen to $90 instead, you would be sitting on a $30,000 loss on top of already having paid ordinary income tax on the full $120,000.

The point is not that holding is wrong. It is that holding is a bet, and sell-at-vest is the neutral default you should deviate from only on purpose.

A second subtlety: the withholding on the vest is frequently too low. Employers commonly withhold federal tax at the 22% supplemental wage rate, but a high earner's vest value may actually be taxed at 32% or 35% at the margin. If you do not sell at vest and instead spend or invest the shares, you can be surprised by a tax bill the following April on income you already received. Selling at vest and setting aside the gap between 22% and your real marginal rate is the cleanest way to avoid that — another reason the vest itself is the moment to act.

Bottom line: At vest your basis resets to the share price, so a same-day sale realizes essentially zero capital gain — sell-at-vest is close to tax-neutral and is the cheapest moment to diversify; every day you hold afterward is a deliberate bet that also builds an embedded gain you will pay to unwind later.

The decision tree

Work through this in order.

1. Compute your single-stock percentage. Add every vested share, ESPP share, and lot you forgot about. Divide by your total liquid net worth (brokerage plus retirement plus cash, excluding your house). That is your concentration.
2. Set a target. For most people, 10% to 15% is the line. Pick yours and write it down.
3. Sell everything above the line that has low embedded gains first. Sell-at-vest lots and recently vested shares have little to no gain — unwinding them is nearly free. Start there.
4. For older lots with large gains, sequence the sales. Use long-term lots (held more than a year, taxed at 0%/15%/20% plus NIIT) over short-term lots (taxed at ordinary rates up to 37%). Spread sales across tax years if a single year's gain would push you into a higher LTCG bracket or trigger additional NIIT.
5. Redeploy into a broad, low-cost index — a total US market or S&P 500 fund, with international and bonds per your overall plan. The goal is to own the market instead of one slice of it.

For most US employees, that is the whole strategy, and it is enough. The tools below are for people with larger or more complicated positions.

Worked example. Staging a large gain across tax years

Sell-at-vest lots are free to unwind, but older lots carry embedded gains, and dumping them all in one year can push you into a higher bracket or trigger NIIT on the whole stack. Spreading the sales smooths the tax.

Take the engineer above who needs to sell $182,000 of employer stock. Suppose $60,000 of that is recently vested with near-zero gain, and the remaining $122,000 sits in older long-term lots carrying $90,000 of embedded long-term gain in total. Selling all $90,000 of gain in one year, on top of a $230,000 salary, would push every dollar of it through the 18.8% band (15% LTCG plus 3.8% NIIT) and risk tipping the top slice toward the 20% LTCG bracket. Staging it over three years keeps the realized gain modest each year:

Tax year	Gain realized	Rate applied	Tax paid	Cumulative gain unwound
Year 1	$30,000	18.8%	$5,640	$30,000
Year 2	$30,000	18.8%	$5,640	$60,000
Year 3	$30,000	18.8%	$5,640	$90,000
Total	$90,000	—	$16,920	$90,000

Sell the $60,000 of zero-gain lots immediately (no tax), then peel off $30,000 of gain per year. Total tax across the three years is $16,920, an effective 18.8% on the gain. The zero-gain lots mean you have diversified $60,000 in year one at no tax cost while the gain-heavy lots come down on a schedule. The trade-off is honest: you carry some single-name risk into years two and three. If the position is dangerously large, weight the early years more heavily — the bracket math is a tie-breaker, not a reason to stay concentrated.

Bottom line: Compute your single-stock percentage including every forgotten lot and ESPP share, set a target, sell zero-gain lots first and stage the gain-heavy ones across tax years to avoid bracket bumps, then redeploy into a broad low-cost index.

Tool 1 — the completion portfolio (for people who want to hold)

If you have genuine conviction and want to keep a meaningful position, do not just let the rest of your money sit in the same index that is already heavy in your employer's sector. Build a completion portfolio: deliberately shape the other holdings to offset what the concentrated stock already gives you.

If 30% of your equity is in a single large-cap US tech name, the other 70% should under-weight US large-cap tech and lean toward what you are missing — value, small-cap, international, and bonds — so the combined portfolio looks balanced rather than like a leveraged bet on one sector. A completion portfolio does not reduce the single-name risk of the stock you kept. It stops you from accidentally tripling down on the same factor across everything else you own.

Worked example. Shaping the other 70%

Suppose you hold a $300,000 equity portfolio and you are keeping $90,000 (30%) in your employer, a large-cap US tech name. A naive "just buy the S&P 500" choice with the other $210,000 makes the problem worse, because the index is itself heavy in large-cap tech — you would be adding more of what you already over-own. The completion approach deliberately tilts the remaining 70% away from that exposure:

Sleeve	Target weight of total	Dollar amount	Why
Employer stock (kept)	30%	$90,000	The position you chose to hold
US large-cap tech (additional)	0%	$0	Already over-owned via employer stock
US value / dividend tilt	18%	$54,000	Offsets the growth/tech factor
US small-cap	12%	$36,000	Adds size factor you lack
International developed and emerging	25%	$75,000	Diversifies away from US tech entirely
Bonds	15%	$45,000	Lowers whole-portfolio volatility
Total	100%	$300,000	—

Looked at on its own, the bottom five rows are aggressively un-tech. Combined with the 30% employer position, the blended portfolio lands close to a broad global allocation. That is the point: the completion sleeve is intentionally lopsided so that the total is balanced. Revisit the weights as the employer stock grows or shrinks, since a position drifting from 30% to 45% changes what "balanced" requires.

Bottom line: A completion portfolio shapes everything you do not hold in employer stock to under-weight that name's sector and factor, so the total looks like a balanced index rather than a doubled-down bet — it does not cut single-name risk, but it stops you from compounding the same exposure everywhere else.

Tool 2 — direct indexing (harvest losses to fund the unwind)

Selling a large appreciated position generates capital gains. Direct indexing can supply the losses to offset them. Instead of buying an index fund, you hold the individual stocks that make up the index in a separate account. In any given year some of those names are down, and the manager harvests those losses while keeping your overall exposure to the index intact.

Those harvested losses offset the gains you realize when you trim your employer stock. A direct-indexing sleeve can also be told to exclude or under-weight your employer and its sector, so the diversification and the loss-harvesting work in the same direction.

Worked example. Harvesting losses to absorb the sell-down gain

Return to the staged unwind: you plan to realize $30,000 of long-term gain this year trimming employer stock, taxed at 18.8%, which is $5,640 of tax. Now suppose you fund a $250,000 direct-indexing account at the start of the year. Even in a flat market, individual names diverge — some constituents fall while the index is roughly unchanged. A reasonable harvest in a normal year runs 3% to 5% of the account in the early years; say the manager harvests $10,000 of losses.

Those $10,000 of losses net against your $30,000 of employer-stock gain, leaving $20,000 of net taxable gain instead of $30,000. Tax becomes 18.8% × $20,000 = $3,760, versus $5,640 — a saving of $1,880 this year. Stack a few years of harvesting against a multi-year unwind and the losses can absorb a meaningful slice of the total gain. Note one important asymmetry: there is no wash-sale rule on gains, but there is a 30-day wash-sale rule on losses — the direct-indexing manager handles this by buying a similar-but-not-identical constituent so the harvested loss is not disallowed.

The trade-offs are real: higher fees than a plain index fund, more complexity, and a benefit that fades as the account itself appreciates and runs out of names trading below their purchase price. It is most useful precisely when you have a big, gain-heavy position to unwind over several years.

Bottom line: Direct indexing holds the index as individual stocks so a manager can harvest losses on the names that are down, and those losses offset the gains from trimming your employer stock — most valuable when you have a large, gain-heavy position to unwind over several years, less so once the account itself has appreciated.

Tool 3 — the exchange fund (for very large, very low-basis stakes)

If your position is large and your basis is low — think early-employee shares or many years of un-sold vests — selling all at once can mean a tax bill that swallows a fifth of the position. An exchange fund (sometimes called a swap fund) is the deferral tool. You contribute your appreciated shares into a partnership pooled with other investors' concentrated positions, and you receive a pro-rata interest in the diversified pool — without triggering capital gains tax at the time of contribution.

The constraints are significant, and you should weigh them honestly:

• Lock-up. Typically seven years before you can redeem into a diversified basket.
• Eligibility. Usually limited to accredited investors or qualified purchasers.
• The 20% rule. To qualify, the fund must hold around 20% in illiquid assets (often real estate), which shapes returns.
• Basis carries over. You defer the gain; you do not erase it. When you eventually exit, you inherit the original low basis.
• Fees. Management fees are higher than an index fund.

Worked example. Outright sale vs exchange fund on a low-basis stake

Suppose you hold $1,000,000 of employer stock with a $100,000 cost basis — a $900,000 long-term gain, the profile this tool is built for. Compare selling outright today against contributing to an exchange fund:

	Outright sale now	Exchange fund
Position value	$1,000,000	$1,000,000
Embedded long-term gain	$900,000	$900,000
Tax due at the transaction	$169,200 (18.8% × $900,000)	$0 (deferred)
Capital diversified immediately	$830,800	$1,000,000
Diversified?	Yes, fully and liquid	Yes, but pooled and locked ~7 years
Basis after	Reset to market	$100,000 carries over (gain deferred)

The exchange fund keeps the full $1,000,000 working in a diversified pool instead of $830,800, because no tax is paid at contribution. But the gain is deferred, not erased — the $100,000 basis follows you, so the $169,200 is owed eventually, and in the meantime you accept a roughly seven-year lock-up, accredited-investor or qualified-purchaser eligibility, the ~20% illiquid-asset drag, and higher fees. Whether deferring $169,200 for seven years beats paying it now and investing the after-tax sum freely depends on your return assumptions, your liquidity needs, and whether you might later qualify for a lower rate (for example, a low-income year or a step-up at death). It is a genuine trade, not a free lunch.

A newer alternative that has emerged is the so-called 351 conversion, where a diversified set of contributed positions is seeded into an ETF on a tax-deferred basis under Section 351. The mechanics and eligibility here are still settling, and the tax treatment depends on meeting strict diversification tests at contribution — so treat any specific 351 product as something to vet with a tax adviser, not a settled playbook. The honest read: exchange-fund-style structures suit a narrow band of people with large, low-basis, long-held stakes. For a first or second vest, they are the wrong tool.

Bottom line: An exchange fund diversifies a large, low-basis position without triggering tax at contribution, but it defers the gain rather than erasing it and locks you in for roughly seven years with eligibility limits and higher fees — worth it only for narrow cases with very large, very low-basis, long-held stakes, never for a first or second vest.

Tool 4 — the 10b5-1 plan (sell on autopilot, especially for insiders)

The behavioural problem with diversifying is that there is never a good day to sell. The stock is always either rising (so you wait) or falling (so you wait). A Rule 10b5-1 plan solves this by committing you in advance: you set a written schedule — sell X shares on these dates, or whenever the price clears this level — while you do not hold material non-public information, and then it executes mechanically.

For insiders, officers, and anyone who regularly has MNPI, this is also a legal shield: trades made under a valid 10b5-1 plan carry an affirmative defense against insider-trading claims, and the plan keeps selling through blackout windows. Under the SEC's 2023 amendments, directors and officers face a 90-day cooling-off period between adopting the plan and the first trade, and other employees a 30-day period, with limits on overlapping plans. Even if you are a rank-and-file employee who does not strictly need the legal protection, the discipline of a pre-committed schedule is the single most reliable way to actually diversify instead of perpetually intending to.

Bottom line: A 10b5-1 plan commits you in advance to sell on a fixed schedule while you hold no material non-public information, which both supplies insiders an affirmative defense against insider-trading claims and lets anyone keep selling through blackout windows — directors and officers wait a 90-day cooling-off period, other employees 30 days, and even those who do not need the legal shield gain the discipline to actually diversify.

Common mistakes

• Letting lots pile up because "I'll sell when it's up." The price is irrelevant to the diversification decision; your concentration percentage is what matters.
• Holding to dodge tax on a sell-at-vest that has no gain. There is nothing to dodge — the gain is roughly zero at vest.
• Selling short-term lots first. Short-term gains are taxed at ordinary rates; prefer long-term lots and time the rest across tax years.
• Forgetting NIIT. Above $200,000 single / $250,000 married MAGI, add 3.8% to your capital gains rate when you model the unwind.
• Treating ESPP shares as separate. They are more of the same stock. Count them in your concentration number.

The closing read

The tax tail should not wag the diversification dog. The biggest risk in your financial life is not the capital gains bill on unwinding a position — it is owning 40% of your net worth in the one company whose fortunes already determine your salary, your bonus, your next grant, and your job security. Sell at vest down to a number you can live with in a bad year, build the rest of the portfolio to balance what you keep, and if the position is large enough to make a clean sale painful, use direct indexing, an exchange fund, or a 10b5-1 plan to unwind it on a schedule. The employees who get rich on equity comp are rarely the ones who held every share. They are the ones who turned concentrated luck into a diversified portfolio while they still had the choice.

Cross-references

• US residents with US RSUs: the complete tax and strategy guide
• State tax optimization for US RSU holders
• Should you sell RSUs at vest or hold? A decision framework
• Sell-to-cover, sell-all or hold: the three RSU vest decisions
• ESPP vs RSU: how to think about both
• ISO and NSO stock options at US companies
• What is an RSU? Restricted Stock Units explained
• RSUs when you change jobs or get laid off
• Turning RSUs into a retirement corpus: 401(k) and Roth for US employees

Critical disclaimer: this article reflects US federal tax rules and capital-markets practice as of June 2026 and is general information, not personalised advice. Capital gains rates, NIIT thresholds, SEC Rule 10b5-1 requirements, and the tax treatment of exchange funds and Section 351 conversions can change and depend on your specific facts, state of residence, and insider status. It does not substitute for advice from a licensed CPA, CFP, or securities-law counsel. Nothing here is a recommendation to buy or sell any specific security.