You've worked at a tech, biotech, or finance company for ten years. The stock has done well. RSUs vested year after year, you held a meaningful chunk, and now your single largest position by far is your employer.
You know the diversification problem is real. You also know that selling triggers a tax bill that's larger than most people's annual income. The temptation is to do nothing, hold the position, and hope the company keeps performing. Sometimes this works. Often it doesn't.
Direct indexing offers a third path that almost no one in this situation knows about, and it's specifically designed for the "can't sell, shouldn't hold" problem.
The shape of the problem
Suppose you have $4M of net worth. $2.5M of it is your employer's stock with an embedded $2.0M unrealized gain (basis $500K). The rest is in a 401(k), some cash, and maybe a house.
The risk concentration is obvious — 60%+ of your wealth in one ticker. The diversification answer would be: sell down to $500K of the stock and reinvest in a diversified portfolio. The tax bill on $2M of long-term gain at 30% combined rate (federal + NIIT + state): about $600K.
The cost of selling is real. The cost of not selling is also real — it's the variance of holding 60% of your net worth in a single name. Both costs are large. The classic financial advice ("just diversify") underrates the first; the classic do-nothing approach underrates the second.
The five tools, in order of preference
For a high-net-worth concentrated-stock holder, the IRS offers a genuine toolkit. Most articles mention one or two; the full picture is broader.
Tool 1: Tax-loss harvest first, then sell
If you have a separate taxable account that's not the concentrated stock, run direct indexing on it for several years first. Build a meaningful loss carryforward — say, $300K of harvested losses. Then use the carryforward to absorb part of the concentrated-stock realization. $300K of loss carryforward against a $2M gain reduces the taxable amount to $1.7M. Tax bill drops from $600K to about $510K. You saved $90K just from the harvest discipline in a separate account.
This requires patience — building the loss bank takes 3-5+ years of consistent harvesting in a meaningful taxable account. But it's a real $90K-$200K savings on a $2M concentrated-stock sale, available to anyone who plans far enough in advance.
Tool 2: Spread the realization across years
$2M of gain in one year pushes you into the highest possible brackets and triggers maximum NIIT. Same $2M spread over 5 years is $400K/year — still high, but each year's bracket creep is smaller and you're not stacked into a single year's marginal-rate cliff.
The art is finding the right pace: enough velocity to actually diversify within a few years, slow enough to avoid the worst bracket effects. For most concentrated-stock holders the answer is roughly 4-7 years of measured selling.
Tool 3: Direct indexing as the diversification target
This is the underused tool. When you sell concentrated stock and reinvest, the conventional answer is "buy a few diversified ETFs." That works.
The better answer for a high-bracket holder: reinvest into a direct-index sleeve specifically designed to exclude the concentrated-stock sector. If you're an Apple employee and you hold $2M of AAPL, when you sell, build a direct-index portfolio that intentionally has zero technology exposure on top of the remaining AAPL. Your overall portfolio then has the right sector weighting, but you're not "doubling down" on tech via VTI which is already 30%+ technology.
This is called "tax-aware overlay" or "completion portfolio" in institutional language. HarvestEngine builds it explicitly: tell us your concentrated holding and target weights, and the direct-index sleeve is designed to bring the household to balance.
Tool 4: Charitable donation of appreciated stock
If you donate to charity anyway, donate the appreciated stock instead of cash. The charity receives the position at fair market value (no tax on either side). You take a deduction equal to the full market value at your ordinary-income rate. Compared to selling, paying tax, and donating the after-tax cash, you save the entire embedded tax on the donated portion.
For a concentrated-stock holder donating $50K-$500K/year over a charitable career, this stacks into substantial savings. The mechanic is well-known but underused — most donors give cash from their checking account out of habit.
Tool 5: §1042 ESOP rollover (specific case)
If you're a founder/early employee selling a controlling stake to an Employee Stock Ownership Plan, §1042 lets you defer all gain permanently by reinvesting in "qualified replacement property" — defined as stock or bonds of operating U.S. corporations.
This is niche (only applies to ESOP sales) but enormously powerful when it does. Worth knowing exists; talk to a specialized M&A tax advisor if it applies.
What HarvestEngine does specifically
For concentrated-stock holders, our positioning is:
- Build the loss bank in advance. If your remaining taxable assets total $200K+ outside the concentrated position, run direct indexing on those. We harvest aggressively for 3-5 years before you sell, accumulating $50K-$300K of carryforward.
- Design the completion portfolio. When you do sell concentrated stock, the proceeds reinvest into a direct-index sleeve weighted to neutralize the remaining concentration. If you still hold $500K of AAPL, the new sleeve underweights tech to bring household exposure to your target. Our portfolio designer takes "concentrated holding" as an input.
- Pace the realizations. Set an annual target ("$400K of realized gains per year for 5 years"). The proposal engine surfaces opportunities to realize within that budget, using carryforward and loss-harvest matching. You see every trade and approve.
- Plan for the step-up. If you don't actually need to sell — if your wealth is enough that the concentrated position can simply be held through your lifetime — the §1014 step-up at death forgives the entire embedded gain. Some concentrated-stock holders find this is the right answer. Software models the trade-off explicitly.
The honest pricing comparison
Wirehouses and large RIAs love the concentrated-stock client. The fees are usually quoted on the full account: 1.0-1.5% on $4M is $40K-$60K per year. Five years of that is $200K-$300K — which nominally pays for itself in tax-savings, but only some of those savings actually flow back to the client.
HarvestEngine charges $99/month (Autopilot) or $199/month (Alpha, which adds short overlay and household coordination). Five years is $5.9K-$11.9K. Different shape, dramatically lower cost. The tax savings are the same; the fee is not.
The conversation worth having
If you have a concentrated-stock position you can't sell without six-figure tax consequences, the right conversation isn't "should I diversify?" — that one's settled, the answer is yes. The right conversation is "how do I diversify with the smallest total cost?" That's where direct indexing, completion portfolios, and disciplined pacing become the levers.
Most advisors won't have this conversation in detail because their fee structure rewards a single recommendation: move all the assets to us. The right answer is usually subtler.
Software lets you run the analysis on your own time, see the numbers on your specific position, and make the call. That's what we built.