Concentrated Stock Positions: The Portfolio Question Behind the Tax Question
If the previous piece in this series framed the first twelve months after a sale as a sequence of phases, this one zooms in on the most urgent specific issue inside those early months: a concentrated stock position. When a founder asks what to do with a concentrated stock position, residual founder equity, acquirer paper from a stock-for-stock transaction, vested shares from an IPO that has now seasoned, the conversation almost always begins with tax. And the tax conversation is full of real, useful machinery: 10b5-1 plans, exchange funds, completion portfolios, structured derivatives, charitable remainder trusts, qualified small business stock elections. The mechanics are intricate enough that they tend to dominate the room.
But there is a prior question, and it is the one most often skipped: what is the appropriate weight for this position in your portfolio at all? The tax conversation is about how to move from where you are to a different state efficiently. The portfolio conversation is about what that different state should be. They are not the same conversation. Solving the second one first changes the first one entirely.
Why the prior question gets skipped.
Three forces conspire to push the tax question to the front. The first is that tax tools are concrete: a 10b5-1 plan has a structure you can describe, an exchange fund has a minimum investment, a charitable structure has a tax outcome you can model. The portfolio question, what should this look like in three years?, is more abstract and harder to act on. Concrete questions get answered first.
The second is that most of the people in the room are tax people. The transaction attorney, the CPA, the strategist at the institution holding the position, their training emphasizes the tax dimension. Portfolio construction is somebody else's specialty, and somebody else has often not arrived yet.
The third is that for the founder, the concentrated position is emotionally complicated in a way other portfolio positions are not. Selling it feels like saying goodbye. Holding it feels like loyalty. Neither feeling has anything to do with whether the position belongs at its current weight. But both feelings make the tax conversation easier to have than the portfolio conversation, because the tax conversation is about mechanics, and the portfolio conversation is about a decision the founder may not want to make.
What the portfolio question actually asks.
Stripped of context, the portfolio question is: if I were starting from cash today, with the household I have, the goals I have, and the risk tolerance I have, how much of this stock would I buy?
Almost no one starting from cash buys forty percent of their net worth in a single security. Not because no security deserves a forty-percent allocation, some securities, in some narrow circumstances, do, but because at most allocations of that size, the household's outcome becomes more dependent on a single business than on every other decision combined. That is appropriate concentration when the founder is operating the business. It becomes a different kind of concentration the day the founder is no longer operating it.
A portfolio-construction principle that has held up across most market regimes and most styles of investing is that no single security should ordinarily exceed roughly five to ten percent of a portfolio meant to provide diversified equity exposure. That range is not a rule from a regulator; it is an empirical observation about what a single name can do to an otherwise diversified portfolio in a bad year. Within that range, a meaningful adverse outcome on the position hurts but does not break the household. At several multiples of that range, it can.
The portfolio question, then, is: given that the appropriate diversified weight for any single security is generally a single-digit percentage of the portfolio, and given that you currently hold a position that is some larger multiple of that, what is the path from here to there?
Three sources of false certainty about why to hold.
Three arguments tend to come up against diversifying out of a concentrated position. Each contains a partial truth. Each, in most cases, dissolves under examination.
The first is "I know this company best." This is true in the sense that founders tend to have deeper context on their former businesses than any outside investor. It is misleading in the sense that the version of the company you knew is increasingly not the version the market is now pricing. The market prices the future of the business, not its past, and the founder's informational edge erodes the moment the founder stops running it. By year two or three post-transition, the edge is largely gone. Holding a position because you knew it best at one point is a different argument than holding it because you know it best now.
The second is "it will recover." This is anchoring bias dressed up as analysis. Recovery from what? A drawdown to a price you remember from your peak holding? The price the position should trade at given current fundamentals is independent of the price you remember it trading at last year. Decisions about whether to hold should be made on a forward-looking basis, what is this position worth from here, not against a high-water mark you happen to remember. The high-water mark is not coming back because you want it to.
The third is "I owe them my loyalty." This conflates two different objects. Loyalty is owed to people: employees you grew up with, customers who supported the business, partners who took risks alongside you. Loyalty to a stock certificate is a category error. The stock has no memory of your loyalty and no obligation to reward it. Whatever you want to do for the people who built the company with you, direct philanthropy, mentorship, capital for their next venture, ongoing involvement, can be done, and arguably done better, from a diversified position than from a concentrated one. The concentrated position is not the vehicle for the loyalty; it is a separate decision being routed through the loyalty.
Pacing the diversification.
Once the portfolio question has been answered, that the appropriate eventual weight is well below the current weight, the diversification path becomes a separate problem with its own discipline. Two things matter: the speed and the structure.
On speed, the binary frame ("hold the whole position vs. sell the whole position") is rarely the right one. Most diversifications happen over months or years, not days. A program that reduces the position over a defined window, sometimes twelve months, sometimes twenty-four, occasionally longer for very large concentrations, accomplishes several things at once. It spreads the realization across tax periods. It dilutes the influence of any single market quarter. It allows the household to adjust to the changed risk profile gradually rather than all at once. And it avoids the behavioral mistake of trying to time the exit perfectly, which almost no one manages to do.
On structure, the choice of vehicle matters, and it is where the tax conversation rejoins the portfolio conversation usefully. Direct sales executed through a 10b5-1 plan, exchange funds for partial in-kind diversification, completion portfolios that build the diversified target around the retained position, options collars that bound the downside without realizing the gain, charitable structures for the portion already destined for philanthropy, each tool has a place, and each is well understood by qualified tax professionals. The tools do not, however, tell you what the appropriate end-state weight is. That decision is upstream of all of them.
The replacement question.
Diversification is half the work. The other half is what you diversify into.
It is striking how often the replacement allocation is treated as an afterthought. The energy goes into structuring the exit from the concentrated position, and then the proceeds are deployed into "a diversified portfolio" without much specification of what that portfolio actually is. This is a missed opportunity on two fronts. The replacement allocation is, by construction, the largest portfolio decision the household will make in this period. It deserves at least as much thought as the diversification mechanics.
A useful sequence: design the replacement allocation first, in detail, as if you were starting from cash. Then treat the diversification of the concentrated position as a translation exercise, moving capital from where it currently is to where it needs to be in the designed portfolio, paced and structured for tax efficiency. This sequence keeps the portfolio decision in the portfolio conversation and the tax decision in the tax conversation, which is where each belongs.
The replacement allocation question is, of course, a much larger topic than this article can cover. It involves the same questions as any other post-exit portfolio: what role this capital plays on the household balance sheet, what the time horizon is, what the drawdown tolerance is, what the operational cash needs are. Those are the questions Article #1 in this series addressed, and they apply here as fully as anywhere else.
The right sequence.
Pulled together, the sequence for handling a concentrated post-exit position looks like this:
- First, the portfolio question. What should the household's eventual weight in this single security be, given everything else it holds and the role this capital plays?
- Second, the replacement question. What is the diversified portfolio that the proceeds should fund, designed with the same rigor as any other plan?
- Third, the path question. What is the pacing of the move from current state to target state, how long, in what increments, with what behavioral and operational margin?
- Fourth, and only fourth, the tax question. What tools and structures execute the move with the smallest tax cost, given the answers to the first three? This is the conversation that belongs with your CPA and tax attorney, who should be in the room from here on.
This is the inverse of the order most conversations occur in. The tax conversation tends to come first because it is the most concrete and because the people most often in the room are oriented toward it. But running the sequence in reverse, tax tools selected first, portfolio implications worked out afterwards, tends to produce portfolios that are tax-efficient but ill-fitted to the household. A position that has been collared, hedged, and tax-deferred is still, after all that machinery, the same position; the underlying portfolio question has just been postponed.
The tax tools matter. Done well, they save substantial sums and make the path much easier to walk. Done as the leading question rather than the trailing one, they tend to obscure the decision the founder actually needs to make.
The portfolio question deserves its place at the front of the conversation. It is the question whose answer determines what every other tool is in service of.
Alphyn Capital Management, LLC is an investment adviser registered with the U.S. Securities and Exchange Commission. This post is for informational and educational purposes only and does not constitute personalized investment, tax, or legal advice or a recommendation to buy or sell any security. Past performance is no guarantee of future returns. Investing involves risk and possible loss of principal. No portion of this article is to be interpreted as a testimonial or endorsement of the firm's investment advisory services. Please consult qualified professionals before making any investment decisions. This post may contain forward-looking statements and represents the author's opinions as of the date of publication. Such statements are inherently uncertain, and actual outcomes may differ materially. ACML does not undertake to update any forward-looking statement.