Concentrated Stock — United States

The US concentrated stock landscape

The US private company ecosystem produces concentrated stock positions at a scale no other market does. Over a typical five-year period, thousands of founders, early employees, and executives find themselves holding positions of $5M to $500M or more in a single company’s stock, often pre-public. The tax, regulatory, and structural considerations have evolved into their own specialized field.

The key distinction from other jurisdictions is the interaction of four layers: federal capital gains tax (up to 23.8 percent including NIIT), state tax (0 to 13.3 percent), federal estate and gift tax (40 percent above exemption), and the specific regime around Qualified Small Business Stock under IRC §1202. The combination makes specific US-only planning moves available, most notably QSBS exclusion and stacking, that dramatically change the post-tax outcome for founders of qualifying C-corporations.

Section 1202 / Qualified Small Business Stock

The most valuable US-specific provision for founders of private companies. Properly structured, §1202 can exclude up to $10M (or 10x basis, whichever is greater) of federal capital gains per taxpayer on qualifying stock.

Qualification requirements.

• Domestic C-corporation at the time of issuance.
• Gross assets below $50M at and immediately after issuance.
• Active business in qualifying industries (excludes personal services, banking, insurance, investing, farming, hospitality, most professional services).
• Acquired by the taxpayer at original issue in exchange for cash, property, or services.
• Holding period of more than five years.

The exclusion. Up to $10M per taxpayer, per qualifying company. Exclusion is from federal capital gains. State treatment varies. California does not recognize the §1202 exclusion. Most other states follow federal.

Stacking. The per-taxpayer limit creates the opportunity to multiply the exclusion. Gifts of QSBS to family members (children, spouses) or to non-grantor trusts, before the five-year sale, allow each recipient-taxpayer to claim their own $10M exclusion. A founder with $60M of QSBS can potentially structure exclusions across multiple recipients totaling $40M to $60M or more of excluded gain.

Documentation is everything. QSBS qualification is a facts-and-circumstances determination that must be supportable on audit. Required documentation includes: date of issuance, gross asset value at issuance, nature of the business, active business verification, holding period tracking, and gift timing for any stacked structures. Every US C-corp founder should have a dated QSBS analysis on file from within the first year of issuance.

Common traps. Converting from LLC to C-corp restarts the five-year clock on any shares issued during the LLC period. Redemptions by the company can disqualify §1202 treatment in some circumstances. Changing capital structure (recapitalizations, reorganizations) can affect qualification.

10b5-1 plans

For executives at public companies, 10b5-1 plans are the standard tool for selling stock while avoiding insider trading concerns. The SEC significantly revised the rules in 2023.

Core mechanics. A pre-established written plan specifies the dates, prices, or amounts of future sales. As long as the plan was adopted in good faith, without material non-public information, and meets specific procedural requirements, the sales are protected from insider-trading claims.

2023 revisions.

• Cooling-off period: 90 days for executives and directors, or through the second annual earnings announcement, whichever is longer.
• Single-plan limitation: Only one active plan allowed at a time (with limited exceptions).
• Certification: The adopting executive must certify that they are not aware of material non-public information and adopted the plan in good faith.
• Disclosure: Company must disclose adoption of 10b5-1 plans by executives.

Strategic use. Executives approaching lockup expiry or managing ongoing concentrated positions use 10b5-1 plans to execute structured selling without timing-related concerns. The plan can specify date-based sales, price-based triggers, or both.

Exchange funds

Exchange funds allow a concentrated stockholder to swap their position into a diversified pool without triggering capital gains at exchange.

Structure. Stockholder contributes concentrated stock to a partnership that holds a diversified pool of single-stock contributions from other participants plus a qualifying real estate sleeve. Receives a partnership interest in the pool. Must hold the interest for at least seven years for tax-deferred treatment to apply.

Historical threshold. Historically $25M or more in minimums. Several current sponsors operate with $5M to $15M minimums, meaningfully widening the addressable market.

The real estate sleeve. To meet the qualifying partnership rules, the fund must hold substantial qualifying assets, typically a 20 to 25 percent real estate sleeve. This limits the pure equity exposure of the pool.

Tradeoffs. Seven-year lockup is real. Specific fund liquidity features vary. Fees are meaningful (typically 0.75 to 1.5 percent annual management plus one-time loads). Appropriate for stockholders who want diversification without immediate tax and can commit to the hold.

Return of original shares. After seven years, some funds allow the partner to take back shares of the original contributed company. Others structure the exit as distributions of the diversified pool. The terms vary significantly by sponsor.

Structured derivative strategies

Zero-cost collars. Buy a put (establishing a floor) and sell a call (capping upside) at offsetting premiums. The position’s value is bracketed. Subject to constructive-sale rules if too tight. Safe-harbor rules provide specific ranges that avoid constructive-sale treatment. Common for executives approaching lockup expiry who cannot yet sell but want protection.

Variable prepaid forwards (VPF). The stockholder delivers a variable number of shares in the future (range specified), and receives 75 to 90 percent of current value in cash up-front. Defers the capital gain until delivery. Generates immediate liquidity. Increasingly scrutinized. Must clearly fall within safe-harbor economics.

Protective puts. Purchase puts without selling calls. Pure cost, no upside cap. Appropriate for situations where the stockholder wants downside protection but is not willing to cap upside.

Covered calls. Sell calls without buying puts. Generates premium income. Caps upside. Less common for concentrated position management. More common for ongoing income generation.

Constructive sale rules (§1259). Aggressive hedging strategies can be treated as a constructive sale of the underlying stock, triggering immediate tax. The rules define specific prohibited transactions. Safe-harbor ranges exist. Execution requires careful legal review.

Gifting strategies

GRATs of concentrated stock. The highest-leverage estate planning move available to pre-IPO founders. A zero-out GRAT transfers the upside above the §7520 rate to remainder beneficiaries gift-tax-free. For volatile high-growth stocks, short-term (2-year) rolling GRATs have historically produced extraordinary transfer efficiency.

Direct gifts to non-grantor trusts (QSBS stacking). Before the five-year QSBS sale, gift shares to non-grantor trusts and family members. Each recipient claims their own $10M exclusion.

Sales to IDGTs. The grantor sells stock to an intentionally defective grantor trust in exchange for a note. No capital gain on sale. Grantor continues to pay income tax (tax-free additional gift). Structure works best when the §7520 rate is low.

Charitable gifts pre-IPO. Donating pre-IPO stock to a DAF or CRT. Donation is valued at fair market (current private company value). The charity holds until IPO and sells tax-free. Deduction amount subject to AGI limits and appraisal rules for closely-held securities.

Pre-IPO planning window

The 12 to 36 months before an IPO or liquidity event is the highest-density planning window for concentrated stock.

Structural moves. Fund a GRAT or series of GRATs. Gift QSBS to family members and non-grantor trusts. Establish dynasty trusts. Restructure holding entities if needed (C-corp conversion, for example). Fund charitable vehicles.

Documentation. Pre-liquidity is the right time to complete QSBS documentation, establish basis tracking, and set up the record-keeping that will be needed post-sale.

Advisor alignment. The tax attorney, estate attorney, corporate attorney, and company’s general counsel should all be aware of personal planning activities. Corporate coordination is particularly important around lockup provisions and 10b5-1 plan adoption.

Hedging preparation. If the plan involves post-IPO hedging (collars, VPFs), the counterparty relationships and specific product selection should be pre-established. Hedging relationships established in the weeks after IPO often come with inferior terms than those established in advance.

State considerations

The state of residency at the time of sale is one of the largest variables in concentrated stock tax planning.

California. 13.3 percent top marginal rate. Aggressive audit posture on departures. Founders planning a sale often consider pre-sale relocation to Texas, Florida, Nevada, or Washington, but only with clean facts and adequate lead time.

New York. 10.9 percent top plus 3.876 percent NYC. Similar audit aggressiveness for departures.

Washington. No income tax, but a 7 percent capital gains tax on gains above $250,000 (with exemptions for real estate and certain business sales). Specific analysis required.

Florida, Texas, Nevada, Wyoming, South Dakota, Alaska, Tennessee. Zero state income tax. Relocation destinations of choice.

Pre-sale residency. Establishing genuine residency 6 to 18 months before a major liquidity event, with clean facts (primary home, family present, driver’s license, voter registration, advisor and banking transitions), can save state capital gains tax entirely. Sloppy departures routinely fail on audit.

Post-liquidity first-year structuring

The calendar year of the transaction is tax-year-consequential. Specific in-year moves:

• Charitable vehicle funding. DAF or CRT funded with appreciated stock, ideally before the transaction closes.
• Loss harvesting across the rest of the portfolio. Realized losses offset realized gains dollar-for-dollar.
• Exchange fund participation. Decision and execution typically in the months following lockup expiry.
• Opportunity zone investment. Capital gains can be deferred, and partially eliminated over multi-year holds, through Qualified Opportunity Fund investments.
• Trust funding. SLATs, dynasty trusts, or similar vehicles funded with post-tax proceeds. Typically in the months after the transaction closes.

Common failure modes

Missed QSBS five-year hold. Sale days or weeks before the five-year anniversary loses the full exclusion. Routine. Preventable with basic date tracking.

QSBS disqualified by company actions. Redemptions, recapitalizations, or asset growth above the $50M threshold can inadvertently disqualify §1202 treatment. Founders should confirm status with tax counsel before any company structural change.

Late gifts that do not stack. Gifts of QSBS to trusts after the stock is contracted for sale may be treated as anticipatory assignment of income. Stacking gifts must be substantive and complete before the sale is agreed.

Constructive sale triggered by aggressive hedge. Collar too tight. VPF outside safe harbor. Combined strategies that together trigger §1259. Each transaction should be reviewed for the combined economic position.

Sloppy pre-sale relocation. Maintaining a primary home or family ties in the origin state while claiming residency elsewhere. Audit uniformly reverses the benefit.

Unused GRAT opportunity. Founders who learn about GRATs post-transaction, when the most valuable use window has already closed.

Over-committed charitable gifting. A founder gives $30M to a newly formed private foundation in year one, then finds the philanthropic commitment exceeds what they actually want to sustain over a decade.

Where to go deeper

Hampton and Enter the Index both have cohorts of founders who have navigated IPO lockup, secondary sales, and the structured products market. TIGER 21 members surface post-liquidity patterns across multiple cohorts. The decisions in this category benefit from both specialist advisors (tax, estate, capital markets) and peer conversation with founders 12 to 24 months further along. See also Tax Strategy, US for the broader tax architecture and Post-Liquidity Planning, US for the first-year playbook.