Pre-IPO Tender Offer: Tax Treatment + Lock-Up Math on $1M

Pre-IPO tender offers exist because of a fundamental problem with employee equity at late-stage private companies. Stock options and RSUs vest based on continued employment, but the underlying shares cannot be sold on any public market. Employees and founders accumulate paper wealth — millions of dollars of vested but illiquid equity — while their cash compensation may be modest relative to the equity value. The liquidity gap creates pressure that can drive employees to leave the company, take out loans against equity, or simply let options expire unexercised because the AMT or exercise-price cost is unaffordable.

Tender offers solve the gap. The company (or an outside investor, often a late-stage venture fund or private-equity firm) offers to buy back a portion of vested employee equity at a known price — typically tied to the most recent 409A valuation or a negotiated premium. The employee tenders shares, receives cash, and the company or buyer holds the shares. For a senior engineer with $5 million of vested-but-illiquid equity at a $10 billion company, a tender offer that allows the sale of $1 million of stock can fund a house purchase, cover an AMT bill, or simply diversify away concentration risk in the employer.

The tax treatment varies by stock type and prior-event history. Shares acquired through ISO exercise are taxed differently than shares from NSO exercise, which are different from RSU shares, which are different from founder shares with 83(b) elections. This article walks through the tax mechanics for each stock type, the SEC and contractual lock-up framework, the section 16(b) considerations for insiders, and the worked tax math on a $1M tender offer liquidity event.

The tender-offer mechanic: how the transaction is structured

A typical pre-IPO tender offer follows this pattern:

1. The company or a third-party buyer agrees to purchase up to a specified dollar amount of employee equity at a fixed price per share (the tender price). The tender price is often based on the most recent 409A valuation (which is set at a discount to preferred-stock price) or a negotiated value.
2. Eligible employees and equity holders receive a tender-offer document describing the price, the eligibility criteria, the maximum amount each holder can tender, the tax treatment, and the deadline for participation.
3. Holders decide whether to participate and how much to tender. The company often limits each holder to a percentage of vested holdings (e.g., 20 percent of total vested equity) to prevent over-concentration of selling pressure.
4. The holder elects to tender, executes a stock-purchase agreement and any related documents (e.g., right-of-first-refusal waivers).
5. The closing occurs simultaneously for all participating holders. Cash is paid out, shares are transferred to the buyer, and the transaction is reported on Form W-2 (for ordinary-income components) or Form 1099-B (for capital-gain sale components) the following January.

The structure matters for tax purposes. If the buyer is the company (a stock repurchase), the transaction is treated differently than a third-party purchase under IRC section 302 (corporate distribution rules). For most modern tender offers structured to qualify as substantially disproportionate redemptions under section 302(b)(2) — where the holder's percentage interest in the company is reduced — the transaction is treated as a sale rather than a dividend, and capital-gain treatment applies on the gain above basis.

Tax treatment by stock type

ISO shares: qualifying versus disqualifying disposition

Shares acquired through the exercise of incentive stock options under IRC section 422 receive favorable tax treatment if held long enough. The qualifying-disposition requirements:

• Held more than 2 years from the original ISO grant date, AND
• Held more than 1 year from the ISO exercise date

For a tender-offer sale that meets both holding-period requirements, the entire gain above the exercise price is long-term capital gain. No ordinary income is recognized on the sale beyond what was already triggered at exercise for AMT purposes.

For a tender-offer sale that fails either holding period, the sale is a disqualifying disposition. The tax treatment under section 421(b):

• Ordinary-income portion: the lesser of (a) the spread at exercise (FMV at exercise minus exercise price), or (b) the actual gain at sale (tender price minus exercise price)
• Capital-gain portion: any remaining gain (tender price minus FMV at exercise, if positive). This is short-term if held less than 1 year from exercise; long-term if held more than 1 year from exercise.

The AMT interaction is critical. At ISO exercise, the spread between exercise price and FMV is an AMT preference item under section 56(b)(3) even though no regular tax is due. If the holder paid AMT in the exercise year, they have an AMT credit (Form 8801) that can offset regular tax in future years. In a qualifying disposition, the regular-tax gain is LTCG and the AMT credit offsets the regular tax on that gain. In a disqualifying disposition, the AMT preference is partially reversed by the ordinary-income recognition, and the AMT credit dynamics depend on the specific year-over-year situation.

NSO shares: appreciation since exercise

Shares acquired through the exercise of non-qualified stock options under section 83 (without an 83(b) election covering the spread, which is rare for NSOs) generate ordinary income at exercise equal to the spread between exercise price and FMV at exercise. The ordinary income is subject to federal income tax withholding, FICA (Social Security and Medicare), and state tax.

After exercise, the shares have basis equal to FMV at exercise. A subsequent tender-offer sale generates capital gain or loss equal to the tender price minus the basis. The holding period for capital-gain treatment starts at exercise:

• Held more than 1 year from exercise: long-term capital gain, taxed at 0/15/20 percent federal plus 3.8 percent NIIT plus state
• Held 1 year or less from exercise: short-term capital gain, taxed at ordinary income rates

For NSO shares with a holding period over 1 year, the tender-offer tax is purely capital gain. The ordinary-income event already occurred at exercise; the tender-offer transaction only crystallizes the capital appreciation from FMV at exercise to tender price.

RSU shares: ordinary income at vest, capital gain at sale

Restricted stock units settle into shares at the vest date. Under section 83(a), the FMV at vest is ordinary compensation income subject to federal and state withholding plus FICA. The shares have basis equal to FMV at vest. A subsequent tender-offer sale generates capital gain or loss equal to tender price minus vest-date FMV. Holding period for capital-gain treatment starts at vest:

• Held more than 1 year from vest: long-term capital gain
• Held 1 year or less from vest: short-term capital gain

For employees with RSUs that vested years before a tender offer, the tender-offer transaction often produces minimal ordinary-income consequences (none beyond what was recognized at vest) and most of the proceeds are capital gain on the appreciation. This is the cleanest scenario for tender-offer tax planning.

Early-exercised options with 83(b) election: founder-style

Some companies allow employees to exercise options before vesting, with the resulting shares subject to a repurchase right at exercise price if the employee leaves. Under section 83, early exercise triggers ordinary-income recognition unless the employee files an 83(b) election within 30 days of exercise. With the 83(b) election:

• The ordinary-income amount is the spread between exercise price and FMV at exercise — typically very low for early-stage exercises (zero spread for at-the-money exercises)
• The shares have basis equal to exercise price plus any spread reported under 83(b)
• Holding period for capital-gain treatment starts at exercise (not vest)

Early-exercised shares with 83(b) election tendered after 1+ year produce long-term capital gain on the full appreciation from exercise price to tender price. This is the most tax-efficient scenario available for tender-offer sales.

Founder shares with 83(b) election

Founders who received restricted stock at incorporation and filed 83(b) elections within 30 days have basis equal to the grant-date FMV (typically very low). Tender-offer sales by founders typically produce long-term capital gain on the full appreciation from grant to tender price. For founders whose grant-date FMV was $0.01 per share and tender price is $50 per share, almost the entire $50 is capital gain.

The QSBS interaction is critical for founders. Under section 1202, shares held more than 5 years in a qualifying C-corporation may exclude up to the greater of $10 million or 10 times basis from federal capital gains tax. Founders who file 83(b) at incorporation and hold for 5+ years before a tender offer have the cleanest possible QSBS scenario.

Worked example: $1M tender offer at three stock-type scenarios

Marcus is a senior engineering manager at a late-stage SaaS company valued at $8 billion. The company announces a tender offer at $40 per share (current 409A valuation), allowing each eligible holder to tender up to 25 percent of vested equity. Marcus has the following vested holdings:

• 15,000 shares from ISO exercises 2 years ago at $5 exercise price (originally granted 4 years ago) — qualifying disposition timing
• 10,000 shares from RSU vesting at $30 FMV 18 months ago
• 5,000 shares from NSO exercise 14 months ago at $20 exercise price (FMV at exercise was $30)

He decides to tender $1 million worth (25,000 shares at $40), allocating across the three types.

Scenario A: tender 25,000 shares purely ISO shares

• 25,000 shares times $40 equals $1,000,000 proceeds
• Cost basis: 25,000 shares times $5 exercise price equals $125,000
• Holding period satisfies both 2-year grant and 1-year exercise tests: qualifying disposition
• Long-term capital gain: $875,000
• Federal LTCG (20 percent at high-income bracket): $175,000
• Federal NIIT (3.8 percent): $33,250
• California tax (13.3 percent on full $875,000 as CA resident): $116,375
• Total tax: $324,625
• After-tax proceeds: $675,375
• AMT credit recovery (if AMT was paid at original exercise): potential additional benefit of $50,000-$200,000 depending on prior AMT position

Scenario B: tender 25,000 shares purely RSU shares (vested 18 months ago)

• 25,000 shares times $40 equals $1,000,000 proceeds
• Cost basis: 25,000 shares times $30 vest-date FMV equals $750,000
• Holding period more than 12 months from vest: long-term capital gain
• Long-term capital gain: $250,000
• Federal LTCG (20 percent): $50,000
• Federal NIIT (3.8 percent): $9,500
• California tax (13.3 percent on $250K): $33,250
• Total tax: $92,750
• After-tax proceeds: $907,250

Note: the lower tax on RSU shares does not mean RSU shares are "better" for tendering — the ordinary income was already recognized at vest with full ordinary-rate tax. The total tax across the lifetime of the equity is similar to the ISO scenario; the tender-offer transaction just reveals the residual capital-gain portion. For tax-efficiency at the tender-offer event itself, RSU shares are typically the cleanest because the ordinary-income event is in the past.

Scenario C: tender 25,000 shares purely NSO shares (exercised 14 months ago)

• 25,000 shares times $40 equals $1,000,000 proceeds
• Cost basis: 25,000 shares times $30 FMV at exercise equals $750,000
• Holding period more than 12 months from exercise: long-term capital gain
• Long-term capital gain: $250,000
• Federal LTCG (20 percent): $50,000
• Federal NIIT (3.8 percent): $9,500
• California tax: $33,250
• Total tax at tender offer: $92,750
• After-tax proceeds at tender offer: $907,250
• Total lifetime tax including the original $25,000-share spread at exercise ($30 FMV minus $20 exercise price equals $10 per share spread times 25,000 equals $250,000 ordinary income times approximately 50 percent combined federal-state-FICA equals ~$125,000): cumulative tax approximately $217,750

The IPO lock-up framework

The 180-day IPO lock-up is a contractual restriction, not a statutory one. The agreement is signed between the company, the underwriters, and the equity holders (founders, employees, investors). It prohibits the sale of shares for typically 180 days after the IPO date. The lock-up is enforced through:

• Contractual prohibition in the stockholder agreement signed at grant or exercise
• Transfer-restriction notations on stock certificates or book-entry holdings
• Underwriter coordination with transfer agents to prevent unauthorized transfers

For tender-offer purposes, the lock-up has no direct effect: the tender offer occurs before IPO, so the lock-up provisions are not yet operative. However, the tender-offer agreement may impose its own holding restrictions on the buyer (the company or third-party investor) that mirror or interact with the future IPO lock-up.

For employees who participate in a pre-IPO tender offer and continue to hold significant equity post-tender, the 180-day IPO lock-up will apply to the retained shares after IPO. The lock-up cannot be circumvented by participating in a pre-IPO tender — but the tender provides liquidity for a portion of holdings before the lock-up period, allowing the employee to diversify or fund expenses without waiting for IPO and the subsequent 180-day waiting period.

SEC Rule 144 for post-IPO sales

SEC Rule 144 governs the resale of restricted securities and applies after the company is publicly traded. For non-affiliates of a public company holding restricted securities (e.g., shares acquired before IPO that are subject to Rule 144 restrictions):

• 6-month holding period from date of acquisition before shares can be sold freely
• After 6 months, non-affiliates can sell without restriction beyond current-information requirements
• After 12 months, even current-information requirements are eased

For affiliates (officers, directors, 10 percent shareholders):

• 6-month holding period applies
• Plus ongoing volume limits (1 percent of outstanding shares or average weekly trading volume in the prior 4 weeks, whichever is greater)
• Plus manner-of-sale restrictions (broker-assisted sales only)
• Plus current-information requirements
• Plus Form 144 filing requirement for sales exceeding $50,000 or 5,000 shares in any 3-month period

For pre-IPO tender-offer purposes, Rule 144 typically does not apply to the tender transaction itself (which occurs while the company is private and uses Rule 144A or Rule 701 exemptions). Rule 144 applies to the buyer's resale of acquired shares after IPO if the buyer is reselling restricted securities.

Section 16(b) short-swing profit rule for insiders

Section 16(b) of the Exchange Act applies to insiders of public companies. An insider is any officer, director, or beneficial owner of more than 10 percent of any class of registered equity. Section 16(b) requires the disgorgement of any profit realized from any matching purchase and sale (or sale and purchase) of the issuer's equity within any 6-month period.

For pre-IPO tender offers, section 16(b) does not apply during the private-company phase because the company's equity is not yet registered. However, section 16(b) can attach retroactively to pre-IPO tender-offer transactions if subsequent post-IPO transactions create matching pairs within 6 months. For example: an officer tenders shares in a pre-IPO tender offer 3 months before the IPO date. After IPO, the officer exercises options and the resulting purchase event is within 6 months of the pre-IPO tender sale. The matching pair can trigger section 16(b) liability for any profit on the post-IPO purchase relative to the pre-IPO tender price.

Most companies structure pre-IPO tender offers to avoid this risk by limiting insider participation in pre-IPO tenders close to the planned IPO date, or by structuring the post-IPO option-exercise activity to avoid 6-month overlap. Insiders should consult with the company's general counsel and outside securities counsel before participating in pre-IPO tender offers within 6 months of a planned IPO date.

The strategic decision: how much to tender

For employees and founders facing a tender-offer opportunity, the strategic considerations include:

• Concentration risk reduction. Most employees holding significant equity in a single private company face concentration risk that exceeds prudent portfolio limits. A tender offer that allows selling 20 to 30 percent of vested equity moves the holder toward better diversification.
• Cash needs. AMT bills from prior ISO exercises, home purchases, education expenses, or other major cash needs justify tender-offer participation regardless of tax efficiency.
• Tax efficiency. The choice of which share lots to tender (older lots with longer holding periods, lots with higher basis, lots with QSBS eligibility) affects total tax outcome. Most tender offers allow employees to specify which lots to tender; high-basis or QSBS-eligible lots are typically the most tax-efficient to tender first.
• Future appreciation expectations. If the employee believes the company will be worth significantly more at IPO or future tender events, selling less in the current tender offer preserves upside. If the company is at peak valuation or facing risks, selling more in the current tender captures certainty.
• Lock-up considerations. Retained shares will be subject to the 180-day IPO lock-up. Employees who need liquidity before or during the lock-up period should tender enough now to fund anticipated needs.

Key takeaways

• Pre-IPO tender offers solve the liquidity trap that holds equity-rich but cash-poor employees and founders at late-stage private companies. A $1M tender offer at a $10B company can fund major expenses, cover AMT bills, or reduce concentration risk.
• The tax treatment depends on stock type. ISO shares trigger qualifying or disqualifying disposition analysis under IRC section 421/422. NSO shares produce capital gain on appreciation from FMV at exercise. RSU shares produce capital gain on appreciation from vest-date FMV. Founder shares with 83(b) election typically produce LTCG on the full appreciation from grant.
• The 180-day IPO lock-up is a contractual restriction that takes effect after IPO, not before. Pre-IPO tender offers are not subject to the lock-up. However, retained shares will be locked up post-IPO.
• SEC Rule 144 applies after IPO to restricted securities and control securities. Pre-IPO tender offers rely on different SEC exemptions (Rule 144A and Rule 701) and are not constrained by Rule 144 holding periods at the time of the tender.
• Section 16(b) short-swing profit rules attach only to public-company insiders, but pre-IPO tender activity can create matching pairs with post-IPO transactions within 6 months. Insiders near a planned IPO date should consult counsel before tendering.
• AMT credit interactions for ISO shares are complex. Holders who paid AMT in the original exercise year have credits that can offset regular tax in the tender year. Qualifying dispositions preserve the AMT credit benefit; disqualifying dispositions partially reverse it.
• On a $1M tender-offer event for a high-income California resident, the after-tax proceeds range from approximately $675K (ISO shares with full LTCG on $5 to $40 appreciation) to approximately $907K (RSU shares with LTCG on $30 to $40 appreciation, since the ordinary-income event was at vest). Total lifetime tax including any prior exercise events varies by stock type.
• Strategic considerations include concentration risk, cash needs, tax efficiency by lot selection, future appreciation expectations, and lock-up planning. Most employees benefit from tendering some shares when offered, with the precise amount depending on individual circumstances.