Direct Indexing for Concentrated Executive Stock

You have $6 million in employer stock — a position you've built through RSU vesting over eight years. Your 10b5-1 plan sells $300,000 per quarter, generating roughly $1.1 million in taxable long-term gains annually. At 23.8% federal (20% LTCG + 3.8% NIIT) plus 13.3% California, you're writing a $411,000 check to the government every year just to diversify.

Direct indexing is the strategy most often used to reduce that tax drag without locking up capital for seven years (exchange fund) or abandoning the sell-down plan entirely. The mechanism is simple: you run a separately managed account (SMA) holding 400–600 individual stocks that approximate the S&P 500 or Russell 3000. As individual stocks underperform, your advisor sells the losers, realizes the tax losses, and buys similar (but not identical) substitutes to maintain market exposure. Those losses are then applied against the gains from your concentrated-stock sales, lowering your net taxable income from the sell-down.

Done well, the SMA can offset 50–80% of the gains from a coordinated concentrated-stock sell-down in the first few years — the equivalent of reducing your effective tax rate on those gains from 37% to 18–22% combined federal-plus-state.

The completion portfolio concept

A standard direct indexing account holds a market-cap-weighted basket of index stocks. But for executives with a concentrated position in a single company, a more precise approach builds a completion portfolio: the SMA is intentionally constructed to underweight the concentrated company and its closest sector peers, so that your total portfolio (SMA + concentrated stock) more closely mirrors the index than if the SMA ignored your existing position.

If you're a technology executive with 80% of net worth in a single software company, a vanilla S&P 500 SMA would still carry 5–8% exposure to that stock (depending on its index weight) and another 25–30% in tech overall. A completion portfolio zeroes out your employer's sector and overweights healthcare, industrials, consumer staples, and energy to achieve true diversification across the combined portfolio. The tax-loss harvesting benefit is the same; the concentration risk is meaningfully lower.

Completion portfolio construction is available through specialist providers at the same fee tier as standard direct indexing. It requires you to disclose the ticker and approximate value of your concentrated position so the optimizer can build around it.

How tax-loss harvesting offsets your sell-down gains

Suppose your 10b5-1 plan sells $300,000 of employer stock in Q1 2026, generating a $270,000 long-term gain (basis was $30,000 from vesting at a lower price). In the same quarter, your direct indexing SMA harvests $180,000 of losses — individual stocks that declined 15–25% since purchase — by selling them and immediately buying highly-correlated substitutes (e.g., sell Ford, buy GM; sell Pfizer, buy Merck).

The $180,000 in harvested losses directly offsets the $270,000 gain, leaving a net taxable gain of $90,000. Federal tax on $90,000 at 23.8% is $21,420 — versus $64,260 on the full $270,000. The SMA just cut your quarterly tax bill by two-thirds.

The harvested losses don't disappear when used — the substitute stocks carry the same low cost basis as the securities they replaced. When you eventually sell those substitutes, you'll recognize gains. But the deferral is real: tax dollars deferred today are worth more than tax dollars paid today, and the realization can often be timed to lower-bracket years (retirement, post-exit gaps, post-lockup lulls).

The wash-sale rule: the one constraint that matters

IRC §1091 disallows a loss if you purchase a "substantially identical" security within 30 days before or after the loss sale — the 61-day window.¹ Direct indexing providers navigate this by holding individual stocks rather than index funds: selling Intel and buying AMD instead of selling an S&P 500 ETF satisfies the "not substantially identical" standard, preserving the loss deduction.

The critical practical rule: if you're enrolled in both a direct indexing SMA and an employer 401(k) or ESPP that automatically purchases your employer's stock, you could inadvertently trigger a wash-sale on losses harvested in the SMA if those accounts buy the same stock within the 61-day window. This rarely affects diversified SMA positions (the SMA holds Apple, not your employer), but it requires coordination across accounts — another reason to work with an advisor who sees your full picture.

The IRS has not extended wash-sale rules to cryptocurrency, though proposed regulations under the Infrastructure Investment and Jobs Act remain pending. For executives who also hold significant crypto positions, harvesting may be less constrained there.

Sizing: how much SMA do you need?

A useful rule of thumb: your direct indexing SMA should be sized at 1–2× your annual sell-down amount to generate meaningful loss harvesting. With 400–500 individual positions, a $1 million SMA will generate roughly $80,000–$120,000 in harvestable losses per year in the first two or three years — enough to offset a comparable amount of gains from the concentrated-stock sell-down.

If you're selling $1.2 million of concentrated stock per year, a $1.5–$2.5 million SMA typically provides useful (if not complete) offset. For executives with annual sell-down targets above $3 million, the SMA strategy alone won't fully offset the tax load — but it reduces it materially while the position is being unwound.

The relationship between SMA size and harvestable losses is not linear. A $2 million SMA doesn't simply produce twice the losses of a $1 million SMA, because the same stocks are represented proportionally. What matters is the breadth of the portfolio (number of individual positions) and market volatility — more dispersion in individual stock returns produces more harvesting opportunities.

The harvesting lifecycle: early years beat later years

Loss harvesting yield is front-loaded. In year one of a direct indexing SMA, every position was purchased at current market prices — roughly half will be down at any given time, providing immediate harvesting candidates. Academic research on direct indexing portfolios suggests annualized tax alpha of 1.0–2.0% in years one through three on a pre-fee basis, declining toward 0.3–0.5% as the portfolio matures and most positions have been "reset" to higher bases.

This harvesting lifecycle has two planning implications:

1. Start the SMA early. If you know your concentrated position needs to be diversified over five years, starting the SMA three years before the heavy selling begins builds the portfolio's harvesting capacity before you need it most.
2. Coordinate the SMA wind-down with the sell-down completion. Once your concentrated position is fully diversified, you no longer need the SMA as a loss-offset vehicle. The SMA transitions into a standard direct-indexed equity portfolio or can be converted to ETFs with minimal additional gain recognition — because the basis in the individual positions will have been reset through harvesting over the years.

2026 tax context for the strategy

For most public-company executives, the applicable federal LTCG rate in 2026 is 20%, with NIIT adding 3.8% — 23.8% federal total. The 20% rate applies to taxable income above $533,400 (single) or $613,700 (MFJ) under IRS Rev. Proc. 2025-38.² NIIT's $200,000 single / $250,000 MFJ threshold is not inflation-indexed, which means virtually every executive with a meaningful salary already clears it.³

California taxes capital gains as ordinary income, up to 13.3% at the top bracket. Combined with federal, California executives face a 37.1% marginal rate on long-term stock gains — making loss harvesting particularly valuable. New York's top rate of approximately 10.9% produces similar math.

The estate tax context matters too. The OBBBA (July 2025) permanently set the per-person estate and gift exemption at $15 million. For executives who expect to hold their eventual diversified portfolio to death, the stepped-up basis under IRC §1014 eliminates all embedded gains at death — which changes the calculus on whether to harvest aggressively now or simply hold for step-up. An advisor models both paths given your specific age, health, and estate plan.⁴

Section 16 and 10b5-1 coordination

The SMA holds diversified index stocks — not your employer's stock. Section 16 reporting obligations apply to transactions in your company's securities, not to the SMA's individual stock trades. The SMA can typically operate independently of your 10b5-1 plan and trading window.

However, two coordination points matter:

• 10b5-1 plan coverage: Your 10b5-1 plan governs the sale of employer stock. The SMA handles the diversified portfolio. These are separate and should not be co-mingled in a single plan document — maintaining clean separation avoids SEC scrutiny on the 2023 "single-plan" amendment that restricts running multiple concurrent 10b5-1 plans covering the same securities.
• Blackout periods: If your company enters a blackout period that suspends your 10b5-1 plan (rare but happens with SEC comment letters, M&A processes), the SMA continues operating normally — you're not selling employer stock through the SMA.

Direct indexing vs. exchange fund: which one fits your situation

The strategies are also combinable. An executive with a $10 million concentrated position might contribute $4 million to an exchange fund (eliminating that portion's embedded gain immediately) while running a 10b5-1 sell-down on the remaining $6 million, supported by a direct indexing SMA to reduce the sell-down's tax cost. The optimal split depends on your basis, timeline, and liquidity needs — not a rule of thumb.

Provider landscape

Direct indexing is available from:

• Parametric Portfolio Associates — longest track record in direct indexing; institutional-grade completion portfolio construction; typically requires $250K+ SMA minimum through custodians.
• Aperio (BlackRock) — acquired by BlackRock in 2021; strong ESG-screening and concentrated-stock completion features; typically $1M+ minimum.
• Morgan Stanley / Eaton Vance Parametric — Morgan Stanley acquired Parametric's parent; now integrated into MS Wealth Management for existing clients.
• Wealthfront and Betterment — automated direct indexing at lower minimums ($100K); suitable for smaller positions but limited completion portfolio customization.
• Frec — newer entrant; no SMA minimum; competitive fees; good for executives at earlier career stages with smaller positions.
• Optimal Asset Management — specialist in tax-managed SMAs; works with independent RIAs.

Your executive compensation specialist may already work with a preferred direct indexing platform, or can coordinate between your existing custodian and a direct indexing overlay manager. The advisor's job is to ensure the SMA's harvesting schedule is synchronized with your 10b5-1 sell-down cadence — doing this in silos produces suboptimal results.

Sources

1. IRC § 1091 — Loss from wash sales of stock or securities. Cornell Legal Information Institute. Disallows loss deductions when substantially identical securities are purchased within 30 days before or after the loss sale — creating a 61-day restricted window. The "substantially identical" standard is not met by different-company substitutes, which is the mechanism direct indexing exploits.
2. IRS Rev. Proc. 2025-38 — 2026 inflation adjustments. 20% long-term capital gains rate applies to taxable income above $533,400 (single) / $613,700 (married filing jointly). Values verified May 2026.
3. IRS Topic 559 — Net Investment Income Tax. NIIT of 3.8% per IRC § 1411 applies to net investment income for taxpayers with modified AGI above $200,000 (single) / $250,000 (MFJ). These thresholds are not indexed for inflation.
4. IRS Estate Tax. $15M per-person estate and gift exemption made permanent by the One Big Beautiful Bill Act (OBBBA, July 2025). IRC § 1014 provides stepped-up basis for inherited assets, eliminating embedded capital gains at death.

Tax law verified as of May 2026. IRC § 1091 (wash-sale rule) is a long-standing provision not modified by OBBBA, SECURE 2.0, or recent legislation. 2026 LTCG rate thresholds per IRS Rev. Proc. 2025-38. Provider minimums and fees reflect current market offerings and are subject to change.