The Concentration Problem
When your biggest asset and your paycheck come from the same place
If you're a senior engineer, product manager, or director at a FAANG company, you already know the math. A typical L6 at Google receives $250K-$400K in annual RSU grants. After four to six years, vested and unvested equity can easily represent 60-80% of household net worth — all in a single ticker.
That's not a portfolio. It's a leveraged bet on one company — the same company that pays your salary, funds your healthcare, and determines your career trajectory. When things go wrong, everything goes wrong at once.
The cautionary tales are not hypothetical
- Enron (2001): Employees held $2.1B in company stock through 401(k) plans. Shares went from $90 to $0.26. Average employee lost $1.2M in retirement savings.
- Lehman Brothers (2008): Employees held roughly 30% of company shares. Stock went from $86 to zero in under a year.
- Meta (2022): Stock dropped 77% peak-to-trough ($384 → $88). An employee with $3M in META shares saw that position fall to $690K — while simultaneously facing layoff risk.
- Cisco (2000): After the dot-com crash, Cisco fell 86% from $80 to $11 and took 23 years to recover to its prior high.
"Concentration creates wealth. Diversification preserves it. The hard part is knowing when to shift."
Studies from J.P. Morgan's wealth management division show that concentrated single-stock positions have a roughly 40% chance of suffering a catastrophic loss (a 70%+ decline from peak) over any 20-year period. The question is never whether you believe in your company — it's whether your financial plan can survive being wrong.
How RSUs Are Taxed
Two taxable events, two different rates
Unlike stock options, RSUs don't require you to buy anything. The company promises shares, then delivers them when vesting conditions are met. That simplicity comes with a straightforward — but often painful — tax treatment.
At Vesting: Ordinary Income Tax
When shares vest, the full fair market value (FMV) on that date is treated as W-2 compensation — taxed at your ordinary income rate. This appears on your paycheck and W-2, subject to federal income tax, state tax, Social Security (up to the wage base), and Medicare taxes.
At Sale: Capital Gains Tax
Your cost basis equals the FMV at vesting. If you sell later at a higher price, the difference is a capital gain — short-term (taxed as ordinary income) if held <1 year from vesting, or long-term (0%, 15%, or 20% + 3.8% NIIT) if held >1 year. If the stock drops below vesting price, you realize a capital loss.
Double-Trigger RSUs (Pre-IPO)
At pre-IPO companies, RSUs typically require two triggers: (1) time-based vesting, and (2) a liquidity event (IPO or acquisition). This protects employees from owing taxes on shares they can't sell. Once both triggers are met, all time-vested units settle simultaneously — potentially creating an enormous single-year tax event.
Section 83(b) Election — The Distinction That Matters
An 83(b) election lets you pay taxes upfront on the grant-date value of restricted stock (actual shares subject to forfeiture). This does not apply to standard RSUs, because RSUs are a promise to deliver shares — there's no property to elect on. However, some early-stage startups grant restricted stock awards (not RSUs), where filing an 83(b) within 30 days of grant can lock in a near-zero tax basis. The distinction between restricted stock and RSUs is critical — get it wrong and you miss the 30-day window or file unnecessarily.
RSU vs ISO vs NQSO
Three equity compensation types, very different tax rules
Large public tech companies overwhelmingly use RSUs. But if you've worked at startups, you likely hold ISOs or NQSOs as well. Understanding the differences is essential for planning across grants.
| RSU | ISO | NQSO | |
|---|---|---|---|
| Purchase required? | No | Yes (strike price) | Yes (strike price) |
| Tax at vest/exercise | Ordinary income on FMV | No regular tax (but AMT on spread) | Ordinary income on spread |
| Tax at sale | Capital gains on appreciation | LTCG if held 1yr + 2yr from grant | Capital gains on appreciation |
| AMT risk | None | Yes — spread at exercise | None |
| 83(b) available? | No (unless restricted stock) | Only early-exercise | Only early-exercise |
| Annual limit | None | $100K vesting per year | None |
| Most common at | Public tech (FAANG) | Pre-IPO startups | Advisors, contractors, non-US |
The ISO AMT Trap
ISOs look attractive on paper — no regular tax at exercise. But the spread (FMV minus strike price) is an AMT preference item. In 2000-2001, thousands of startup employees exercised ISOs, owed six-figure AMT bills, then watched the stock crash below their strike price. They owed tax on phantom gains they never realized. If you hold ISOs, model the AMT impact before exercising.
The Vesting Tax Bomb
Why your company's withholding probably isn't enough
The typical FAANG RSU vesting schedule is 4 years with a 1-year cliff — meaning 25% vests after 12 months, then the remainder vests quarterly or monthly. Every vest date triggers W-2 income. And every vest date likely under-withholds.
Example: The Withholding Gap
This gap repeats every vest period
If you have $800K in annual RSU vests, the under-withholding can create a $150K+ estimated tax payment due at filing. Miss the quarterly estimated payment deadlines (April 15, June 15, September 15, January 15) and you'll owe underpayment penalties on top. Many tech employees discover this gap for the first time when their CPA delivers the April bill.
The fix: Work with your CPA to calculate quarterly estimated payments that account for the withholding gap. Some employers allow you to elect supplemental withholding on RSU vests — ask your stock plan administrator. And if your company lets you choose between "sell-to-cover" and "net share settlement," understand that sell-to-cover gives you more control over the number of shares retained.
Post-Vesting Strategies
Five paths from concentrated to diversified
Once shares vest, you have a choice. Hold and hope — or execute a deliberate strategy. Here are the primary approaches, ranked from simplest to most tax-efficient.
1. Systematic Selling ("Vest & Sell")
Sell a fixed percentage of each vest within days of vesting. The simplest approach: eliminates timing decisions, keeps concentration below a target threshold, and creates a disciplined cadence. Holding period is minimal, so gains above the vest-date basis are typically short-term — but the simplicity and behavioral benefit often outweigh the tax drag.
Best for: Employees who want automatic discipline. Set the rule once, follow it every vest.
2. Tax-Loss Harvesting on Vested Shares
If the stock drops below your vesting-date basis, you can sell at a loss and use that loss to offset other gains — including gains from selling other appreciated lots. Reinvest in a correlated-but-not-identical position to maintain market exposure. Watch the wash sale rule: you cannot repurchase substantially identical securities within 30 days.
Best for: Employees holding lots that vested at a market high (e.g., late 2021 tech peaks).
3. Direct Indexing
Instead of buying an index fund, purchase the individual stocks that comprise the index — minus your concentrated holding. This achieves broad market exposure while avoiding adding to your existing position, and enables ongoing tax-loss harvesting across hundreds of individual lots. Requires a $250K+ account and typically involves an asset manager or platform like Parametric or Aperio.
Best for: Employees with $500K+ to invest who want index-like returns without doubling down on their employer's stock.
4. Exchange Funds
Pool your concentrated shares with other investors holding different stocks. You contribute AAPL, someone else contributes MSFT, a third contributes GOOG. Everyone gets out a diversified basket. Structured under Section 351 to avoid triggering a taxable event. Requires qualified purchaser status ($5M+ investable), 7-year lockup, and typically carries 1%+ annual fees.
Best for: Qualified purchasers willing to accept a long lockup for tax-deferred diversification.
5. In-Kind Contribution to an Income-Generating Structure (Embark)
Contribute appreciated shares in-kind to a structured SPV that generates income through covered call writing. The contribution is generally tax-deferred (no capital gains triggered at contribution). You receive income distributions, retain upside exposure up to the call strike, and reduce concentration risk over time. No 7-year lockup. Income begins immediately.
Best for: Investors with $500K+ in appreciated shares who want current income without a taxable sale.
"The best RSU strategy is the one you actually follow. Automation and commitment devices beat tax optimization that never gets executed."
Insider Trading Rules
10b5-1 plans, Rule 144, and blackout periods
Even if you're not a C-suite executive, your company may classify you as an "insider" or "Section 16 reporting person" based on your role and access to material nonpublic information (MNPI). Understanding the rules is non-negotiable — violations carry both civil and criminal penalties.
Rule 10b5-1 Trading Plans
A 10b5-1 plan is a pre-arranged, written trading program adopted when you do not possess MNPI. Once established, trades execute automatically on a schedule — regardless of what you learn later. This provides an affirmative defense against insider trading allegations.
- 2023 SEC amendments: Officers and directors must wait a cooling-off period of 90 days (or until the next quarterly filing) before the first trade. Non-officers wait 30 days.
- Plans must be entered in good faith and cannot be adopted, modified, and terminated in patterns suggesting manipulation.
- One plan at a time (with limited exceptions).
Rule 144 Restrictions
Rule 144 governs the resale of restricted and control securities. If you received shares directly from the company (not through open-market purchases), or if you're an affiliate (officer, director, or 10%+ shareholder), Rule 144 applies.
- Holding period: 6 months for reporting companies, 1 year for non-reporting.
- Volume limits (affiliates): Cannot sell more than the greater of 1% of outstanding shares or the average weekly trading volume over the prior 4 weeks, per 90-day rolling period.
- Form 144 filing: Required if selling >5,000 shares or >$50,000 in value in any 3-month period.
Blackout Periods
Most public tech companies impose trading blackouts — typically starting 2-4 weeks before earnings and lasting until 1-2 business days after the earnings call. Some companies impose additional blackouts around product launches, M&A activity, or material events. During blackouts, you generally cannot sell shares outside of an established 10b5-1 plan. For a company reporting quarterly, this can mean only ~4-5 open trading windows per year, each lasting 2-4 weeks.
Practical implication
If you're classified as an insider, your diversification options are severely constrained by timing. A 10b5-1 plan is the most reliable way to implement systematic selling. For non-sale strategies like in-kind contributions to an income-generating structure, consult your company's legal team to confirm whether the contribution itself is treated as a "sale" under company policy.
When Concentration Becomes Dangerous
Risk thresholds and historical blowups
Financial planners generally define concentration risk thresholds as follows:
>10%
Concentrated
Begin planning for diversification
>25%
High Risk
Active diversification warranted
>50%
Extreme
Urgent action needed
The danger is compounded because tech employees face correlated risk: a company downturn affects stock price, job security, unvested equity value, and future earning power simultaneously. A 50% stock decline often coincides with layoffs — precisely when you need liquidity most.
| Company | Period | Peak → Trough | Decline | Recovery |
|---|---|---|---|---|
| Enron | 2001 | $90 → $0.26 | -99.7% | Never |
| WorldCom | 2002 | $64 → $0.06 | -99.9% | Never |
| Cisco | 2000-02 | $80 → $11 | -86% | 23 years |
| Lehman Bros | 2008 | $86 → $0.00 | -100% | Never |
| GE | 2017-18 | $32 → $7 | -78% | Spun off |
| Meta | 2022 | $384 → $88 | -77% | ~1.5 years |
| Peloton | 2021-22 | $171 → $8 | -95% | Pending |
| Snap | 2022 | $83 → $8 | -90% | Pending |
"Nobody plans for a 77% decline. But if 60% of your net worth was in META in early 2022, that's exactly what happened to you."
The Embark Approach
Contribute appreciated shares. Generate income. Defer taxes.
Embark was designed specifically for the problem tech employees face after vesting: large positions in appreciated stock where selling triggers significant capital gains, but holding concentrates risk and produces little or no income.
In-Kind Contribution
Transfer appreciated shares directly — no sale, no capital gains event at contribution. Your cost basis carries over to the SPV structure.
Income Generation
Covered call writing on your contributed shares generates targeted 10%+ annualized income, distributed to you as cash flow. Your shares work for you.
Retained Upside
You retain meaningful upside exposure up to the call strike price. If the stock appreciates moderately, you participate in that growth while collecting income.
Concentration Reduction
Over time, income distributions provide cash that can be diversified into other assets — reducing your single-stock exposure gradually without a large taxable liquidation.
| Sell & Diversify | Exchange Fund | Embark SPV | |
|---|---|---|---|
| Tax at entry | Full capital gains | Deferred (Sec. 351) | Deferred (in-kind) |
| Current income | Depends on reinvestment | Minimal | 10%+ targeted |
| Lockup | None | 7 years | Fund-term (shorter) |
| Minimum | Any amount | $5M+ (QP only) | $500K+ (accredited) |
| Upside retained | New portfolio | Basket exposure | Up to strike price |
Who it's for: Embark is designed for accredited investors with $500K+ in appreciated, post-lockup shares of publicly traded companies. You're not selling your conviction — you're making it productive. If you believe in the stock long-term but want income today, this is the structure that bridges the gap.
Frequently Asked Questions
How are RSUs taxed when they vest?
RSUs are taxed as ordinary income at the fair market value on the vesting date. Your employer withholds federal tax (typically 22% supplemental rate), state tax, Social Security, and Medicare. Any subsequent gain or loss when you sell is taxed as a capital gain — short-term if held under one year from vesting, long-term if held over one year.
What is the difference between RSUs, ISOs, and NQSOs?
RSUs are taxed as ordinary income at vesting with no purchase required. ISOs receive favorable long-term capital gains treatment if holding period requirements are met, but may trigger AMT. NQSOs are taxed as ordinary income on the spread at exercise. RSUs are the most common equity compensation at large public tech companies.
Can I make an 83(b) election on RSUs?
Generally no. Section 83(b) elections apply to restricted stock (actual shares subject to vesting), not RSUs (which are a promise to deliver shares). However, some pre-IPO companies grant restricted stock awards where an 83(b) election within 30 days of grant can lock in a lower tax basis. Always consult a tax advisor about your specific grant type.
What percentage of my net worth in a single stock is concentrated?
Most advisors consider more than 10% of investable net worth in a single stock to be concentrated. Above 25% is high risk, and above 50% is extreme. Many tech employees unknowingly exceed these thresholds when factoring in unvested RSUs and career dependency on the same company.
What is a 10b5-1 trading plan?
A Rule 10b5-1 plan is a pre-arranged trading program that allows corporate insiders to sell shares on a predetermined schedule, providing an affirmative defense against insider trading claims. Plans must be adopted in good faith when the insider does not possess MNPI, and SEC amendments effective 2023 require a cooling-off period of 90-120 days before the first trade.
Why is the default RSU tax withholding often insufficient?
Companies typically withhold at the 22% federal supplemental rate, but high-earning tech employees often fall in the 32-37% federal bracket. Add state taxes (up to 13.3% in California), the 0.9% Additional Medicare Tax, and the 3.8% Net Investment Income Tax, and actual liability can exceed 50%. The gap creates a large estimated tax payment due at filing.
What are double-trigger RSUs?
Double-trigger RSUs require two events before shares are delivered: (1) meeting the time-based vesting schedule, and (2) a liquidity event such as an IPO or acquisition. They are common at pre-IPO companies and prevent employees from owing taxes on shares they cannot yet sell.
How can Embark help with concentrated RSU positions?
Embark allows qualifying investors to contribute appreciated, post-lockup shares in-kind to an income-generating SPV structure. This defers capital gains taxes at contribution, generates targeted 10%+ annual income through covered call strategies, retains meaningful upside exposure, and reduces single-stock concentration — all without requiring an immediate taxable sale.
Next Steps
Turn your RSU position into a plan
If you hold $500K or more in vested shares of a single publicly traded company, you don't need more information — you need a framework. Embark's team can model your specific position, estimate income potential, and show you exactly how the structure works.
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