Equity compensation has a built-in gravitational pull: every vest, every ESPP purchase, every refresher quietly raises your allocation to a single ticker — the same ticker that signs your paycheck. Nobody chooses 40% of their net worth in employer stock; people arrive there, one default at a time. This guide is about noticing the drift, deciding your number on purpose, and building machinery so the decision executes itself.
The risk you already carry before owning a share
Think of your human capital — the present value of your future paychecks, bonuses and unvested grants — as an asset. For most equity-comp recipients it is the largest asset they own, and it is 100% concentrated in one company and one industry. A rough patch for the company can simultaneously hit your salary growth, your bonus, your unvested equity’s value, and your job itself. Holding the stock on top means the same event also hits your savings. Employees of collapsed or cratered companies — the cautionary tales span every decade — didn’t merely lose jobs; many lost the portfolio that was supposed to cushion the job loss.
The mental glitch that keeps the position growing
Behavioral economists call it the endowment effect: we demand more to give up what we hold than we would pay to acquire it. The antidote is one clean question: “If this vest had arrived as cash, would I buy this many shares of my employer today?” Economically the situations are identical — a vested RSU is cash that has already been taxed, temporarily wearing a ticker symbol. Almost no one answers yes at 30% of net worth; yet plenty of people hold at 30%. The gap between those answers is pure inertia, and it compounds quarterly.
Picking your number
Standard diversification guidance caps any single stock around 5-10% of investable assets; given the human-capital overlap, employer stock deserves the bottom of that range or below for most people. Adjust with honest inputs:
- Lower cap if: your industry is cyclical or winner-take-all; your skills are firm-specific; you have dependents or a near-term goal (house, runway); unvested grants are large (future exposure is already booked).
- Higher tolerance if: your finances are robust without the position; the rest of your portfolio is genuinely diversified; you would knowingly accept a venture-style bet and can afford zero.
- Private-company holders get less choice — liquidity arrives in windows (tender offers, IPO lockup expiries). The discipline becomes: pre-decide what fraction you sell at each window, before the window opens.
The drift, quantified
Noor has $300k invested, $30k (10%) in employer stock, and $40k/quarter vesting. Holding every vest: in one year her employer position is ~$190k of ~$460k — 41% — without a single active decision. Alternative policy: sell at vest, sweep to index funds, rebalance any legacy shares down to a 10% cap quarterly. Same income, same taxes paid at vest either way; radically different exposure to one bad earnings call.
Auditing the tax reasons to wait
Taxes are the most respectable-sounding reason to hold, so audit them properly:
- “Selling at vest triggers tax.” False at the margin — the income tax was triggered by vesting; an immediate sale adds ~nothing. This excuse evaporates under inspection.
- “I’m waiting for long-term rates.” Legitimate arithmetic: the saving is (ordinary − LTCG rate) × the gain only — often a few percent of position value — weighed against months of single-stock volatility that routinely exceeds it. Sometimes worth it for modest positions; rarely a reason to hold a dangerous one.
- “The embedded gain is huge.” The strongest version. Tools: sell highest-basis/long-term lots first; spread sales across years and around other income; donate the lowest-basis shares (deduction at market value, gain never taxed); for very large positions, exchange funds or charitable vehicles with an advisor. Note these are ways to manage the exit, not arguments against exiting.
Machinery beats willpower
- Set the cap in writing. “Employer stock ≤ X% of investable assets.” One sentence, decided calmly.
- Default the flow. Enable sell-at-vest (or sell-all elections) so new shares never join the pile; do the same on ESPP purchase dates after harvesting the discount (how).
- Schedule the stock, not the mood: fixed quarterly sales of legacy shares until the cap is met — insiders formalize this as 10b5-1 plans; everyone else can copy the spirit.
- Route the proceeds instantly into your normal diversified allocation, and the withholding-gap reserve if vests are large (the math).
- Review annually, not daily. The policy only works if the news cycle can’t renegotiate it.
Loyalty belongs in your work. Your portfolio’s only job is to be there — fully intact — whatever happens to any single company, including the excellent one you work for.
Key takeaways
- Your job already concentrates your financial life in one company; holding its stock doubles down with the same risk factor.
- Common guardrails put any single stock at 5-10% of investable assets — employer stock arguably deserves a lower cap, not a higher one.
- Keeping vested RSUs is economically identical to receiving cash and buying the stock today; if you wouldn't buy it, the hold needs a better reason than inertia.
- Tax is a real but bounded reason to delay sales — long-term rates and lot selection matter — and a terrible reason to hold forever.
- Automatic rules (sell-at-vest defaults, 10b5-1-style schedules, percentage caps with quarterly rebalancing) beat case-by-case willpower.
Frequently asked questions
My company's stock has crushed the market. Why would I sell?
Past performance is exactly how concentration stories begin. Plenty of dominant companies later stagnated or collapsed while their employees held on; survivors are the ones writing the 'never sell' posts. The question is never how the stock did — it's whether you would buy this much of it today with fresh cash.
Isn't selling at vest a taxable event I should avoid?
Vesting itself triggered the income tax; selling immediately adds approximately zero additional tax because there's been no time for gains. Sell-at-vest is the rare financial move that's both risk-reducing and essentially tax-free at the margin.
What about long-term capital gains on appreciated shares?
Real, and worth planning around: prioritize selling long-term lots and the highest-basis lots first, spread large unwinds across tax years, and consider charitable donation of the most appreciated shares. But run the comparison honestly: a 15-20% tax on the gain versus a realistic chance of a 30-50% drawdown in a single stock.
Are there formal limits for insiders?
Executives and employees with material nonpublic information face trading windows and, often, pre-arranged 10b5-1 plans. Even non-insiders can borrow the idea: a written, scheduled selling plan adopted in calm moments and executed automatically.
Educational disclaimer: This guide is general information, not financial, investment, tax or legal advice. Figures refer to the tax years stated and change over time; rules differ by jurisdiction and personal circumstances. Verify current figures with the IRS / HMRC and consult a qualified professional before acting. See our full disclaimer.