In 2024, a Series A biotech co-founder lost his founder equity 11 months after incorporation. On paper, he owned 40% of the company. Six months later, he owned zero.
Building a startup involves massive personal and financial risk. When co-founders launch a company, they often believe they will stay together until a successful exit. Yet, industry research shows that approximately 65% of startups experience a co-founder departure before reaching Series B.
The vesting cliff was originally designed to protect the company from short-term contributors. Today, it is increasingly weaponised against founders. If you are removed from your startup, the fate of your founder equity depends almost entirely on your corporate agreements. Being terminated before your shares fully vest can have devastating financial consequences.
This guide explains what happens to your founder equity when a departure occurs, the key components of your equity agreement, and how to minimise your legal risk.
Understanding Stock Vesting and Startup Equity
When a startup is incorporated, founders rarely own their shares outright. The shares are subject to stock vesting, meaning founders must earn equity over a set period. This protects the company if a co-founder leaves after a few months – tying ownership to time or milestones ensures long-term contributors keep their equity.
The Typical Vesting Schedule
A standard vesting schedule in the startup ecosystem spans four years, structured with a one-year cliff. Under this model:
- The One-Year Cliff: No shares vest during the first 12 months. On the first anniversary of the vesting commencement date, 25% of the total shares vest all at once.
- Monthly Vesting: After the cliff is met, the remaining 75% of the shares vest in equal monthly increments over the next 36 months (approximately 2.08% per month).
If you are terminated before reaching the one-year cliff, you leave the company with zero vested shares. If you are terminated after two years, you will typically keep 50% of your shares, while the remaining unvested shares are subject to forfeiture or buyback. This is one of the top 5 startup equity mistakes founders make, assuming their shares are safe simply because they founded the company.
Why Startups Implement a Vesting Schedule
Vesting schedules are not designed to punish founders. Instead, they serve two primary purposes: protecting co-founders from one another and satisfying future investors.
Protecting the Co-Founder Relationship
Consider a 50/50 software co-founder split with no vesting. If your partner quits after three months for a corporate job, they still own half the company – leaving you with 100% of the work for 50% of the reward. Vesting prevents this outcome.
Venture capital firms also rarely invest in companies where founders own shares outright. Before writing a check, institutional investors typically require founders to place their shares on a new or reset vesting schedule to ensure the core team stays incentivised post-investment.
Life Sciences and Biotech: When Vesting Cliffs Become Existential
Biotech founders face unique equity risks. Software companies might scale and exit in three years. Life sciences startups have much longer development cycles. It routinely takes 5 to 10 years just to reach Phase II clinical trials. This reality does not align with a standard four-year vesting schedule.
One of the most dangerous situations for a biotech founder is the “inventor on the patent vs. shareholder of the company” dynamic. You might have invented the core intellectual property. But if you are fired, you could lose the equity tied to that very invention.
The risk peaks right before major inflexion points. Imagine a scientist founder fired right before an FDA approval, an IND filing, or a major clinical trial result. Losing equity right before the company’s valuation spikes means forfeiting stock that would have been worth tens of millions of dollars.
Because of these long development timelines, sophisticated biotech investors sometimes request a five – or six-year vesting schedule. They want alignment with the actual drug development timeline. If you face a longer vesting period, your protection against early termination must be carefully negotiated in your founder agreements.
What Happens to Founder Equity Upon Termination
Your termination type – with cause, without cause, or resignation for Good Reason – dictates how much equity you keep.
Termination Without Cause
If the board of directors decides to move the company in a different direction and terminates you for business reasons, rather than misconduct, this is a termination without cause. In this situation, the vesting schedule simply stops. You retain whatever shares have vested up to your final day of service, and you lose the unvested portion.
Termination With Cause
If you are fired for a specific, severe reason outlined in your equity agreement (such as fraud, embezzlement, a material breach of contract, or criminal activity), this is a termination with cause. Some agreements attempt to claw back even vested shares when termination is for cause. Whether such clawbacks are enforceable varies by state – Delaware courts increasingly scrutinise broad vested-share clawbacks as unconscionable, while other jurisdictions may enforce them if the ’cause’ definition is narrow and the clawback is proportionate.
Resignation for Good Reason
Some sophisticated agreements include a “Good Reason” clause. This protects founders if the company makes their job intolerable, such as drastically cutting their compensation, demoting them, or forcing them to relocate. If a founder resigns for Good Reason, the law often treats the departure as a termination without cause, allowing the founder to keep their vested shares and potentially activate acceleration clauses.
What Happens to Unvested Shares: Repurchase Rights and Buybacks
When a founder is terminated, unvested restricted stock is resolved according to the startup’s bylaws and equity agreement. Generally, unvested shares are returned to the company’s treasury through cancellation or repurchase. This decreases total outstanding shares, effectively increasing ownership percentages of remaining shareholders and investors.
A common misconception is that unvested shares go directly to other founders. Instead, they are absorbed into the corporate pool to hire replacements or issue new employee equity. If your equity is restricted stock, you technically own the shares on day one – but the company retains a repurchase right over the unvested portion until you leave.
Pricing the Repurchase
The price at which the company can buy back unvested shares is almost always specified in the initial purchase agreement. Typically, there is a massive difference between pricing at the “lower of cost or FMV” versus “FMV at termination.”
Most standard founder agreements set the repurchase price at the original price paid by the founder (which is usually a nominal amount, such as $0.0001 per share). This means the company pays next to nothing to reclaim unvested stock.
However, if an agreement dictates repurchase at the current Fair Market Value (FMV), serious conflicts arise. Recent Delaware case law trends (2024-2025) heavily scrutinise the reasonableness of board valuations during buybacks. 409A valuation discrepancies frequently become a primary source of litigation, as founders argue the board artificially deflated the company’s value right before their termination.
Restricted Stock Versus Stock Options
It is important to understand whether your founder equity is structured as restricted stock or stock options, as the termination rules differ significantly between the two.
For stock options, a critical trap is the post-termination exercise window. If you are fired, you typically have only 30 to 90 days to pay the strike price and purchase your vested options. If you do not have the cash to buy the shares, or if the tax burden of exercising is too high, you may forfeit your earned equity entirely.
| Feature | Restricted Stock | Stock Options |
| Ownership | You own shares immediately, subject to repurchase | You have the right to purchase shares in the future |
| Vesting | Repurchase rights lapse over time | The option becomes exercisable over time |
| Post-Termination | The company buys back unvested shares; you keep vested | Unvested options cancel immediately; vested must be exercised within 30-90 days |
| Tax Filing | Requires 83(b) election within 30 days | No 83(b); tax paid upon exercise or sale |
Common Founder Agreement Mistakes to Avoid
Many founders sign standard templates when incorporating, only to realise years later that their agreements offer no protection during a dispute.
Neglecting Acceleration Provisions
An acceleration clause determines what happens to your unvested shares if the company is acquired or if you are terminated. There are two primary types of acceleration:
- Single-Trigger Acceleration: Unvested shares vest immediately upon a specific event, such as the sale of the company.
- Double-Trigger Acceleration: Unvested shares vest if the company is acquired and you are terminated without cause within a certain period (e.g., 12 months) after the acquisition. This is the standard preferred by institutional investors.
Failing to negotiate double-trigger acceleration leaves founders vulnerable to being pushed out right before an acquisition.
Vague Definitions of Cause
Broad “Cause” definitions let the board manufacture firing reasons to strip your vested equity. Well-drafted agreements limit “Cause” to severe, willful misconduct – and require a formal board vote with notice and an opportunity to cure.
Relying on Handshake Deals
Co-founders often make oral promises about equity splits or departure terms. In corporate law, if it is not in a signed shareholders‘ agreement or board resolution, it does not exist. Handshake deals drive costly equity litigation.
Why the Section 83(b) Election is Critical
By default, the IRS taxes restricted stock as it vests. If your shares are worth pennies at incorporation but grow significantly over four years, you will owe ordinary income tax on each tranche – even though you cannot sell the shares to pay the tax bill.
An 83(b) election tells the IRS to tax you on the entire grant on the day you receive it, when shares are worth a fraction of a cent. The election must be signed and mailed to the IRS within 30 days of your equity grant. This deadline is absolute – the IRS grants no extensions, and missed filings cannot be cured. Failing to file can result in tax liabilities that bankrupt founders as the company grows.
QSBS Implications of Forfeited Stock
Another massive risk of forfeited stock involves Qualified Small Business Stock (QSBS) under Section 1202 of the tax code. This provision allows founders to exclude millions of dollars in capital gains from federal taxes.
In July 2025, the One Big Beautiful Bill Act (OBBBA) significantly altered QSBS benefits. The legislation increased the lifetime QSBS cap to $15 million. It also introduced a tiered exclusion system. Founders can now exclude 50% of gains after a three-year holding period, 75% after four years, and 100% after five years. Crucially for our local clients, New Jersey adopted these QSBS rules starting January 1, 2026.
When you lose unvested stock due to early termination, you lose the shares and the associated holding period. Forfeiting unvested equity means kissing millions in future tax-free wealth goodbye. Sophisticated founders negotiate their vesting terms and severance packages, keeping these specific QSBS holding period requirements in mind. A poorly timed firing can cost a founder their entire tax shield.
How Startups Can Reduce Legal Risk Surrounding Vesting
For companies managing a co-founder departure, three steps reduce litigation risk: maintain clear corporate governance with documented board resolutions, tie any milestone-based vesting to objective performance metrics, and negotiate formal separation agreements that exchange small acceleration or severance for a release of claims.
When to Consult a Startup Law Attorney
Founder equity is complex, and the stakes are incredibly high. You should seek specialised legal counsel in the following scenarios:
- During Incorporation: Review vesting terms, acceleration clauses, and “cause” definitions before signing.
- Before Fundraising: Negotiate protections when investor term sheets alter your vesting schedule.
- Upon receiving a Termination Threat: Consult counsel immediately to review your agreements and evaluate your options.
A corporate attorney can help structure your agreements to align incentives while protecting your ownership interest from unexpected departures.
How Crowley Law Helps with Founder Equity and Vesting Agreements
Crowley Law LLC builds protective vesting structures and founder agreement frameworks for life sciences and technology startups. We help founders negotiate acceleration provisions, tighten “cause” definitions, and align equity terms with QSBS requirements before a termination event strips millions in earned ownership.
Negotiating the right vesting protections early helps prevent forfeiture disputes, avoid clawback litigation, and preserve your tax-free wealth before a board decision puts your equity at risk. Contact Crowley Law to speak with a startup equity attorney, whether you need an initial founder agreement review or a complete equity dispute analysis.
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Frequently Asked Questions (FAQs)
| Question | Answer |
| Can the board of directors fire a founder and take their equity? | Yes, the board can reclaim unvested equity through repurchase rights. Vested equity is generally safe unless the agreement contains a “for cause” clawback provision. |
| What is a double-trigger acceleration clause? | It is a provision where your unvested shares immediately vest if two events occur: the company is acquired, and you are terminated without cause within a specified timeframe after the acquisition. |
| What happens if I forget to file my 83(b) election? | You’ll owe ordinary income tax on share value as each tranche vests, instead of a nominal upfront tax. The 30-day deadline cannot be extended or cured. |
| Does a standard vesting schedule apply to co-founders? | Yes. Standard practice and investor expectations require co-founders to place initial shares on a vesting schedule, even though they technically own the company. |
| Can a founder resign and keep all of their stock? | Only if they have met their vesting requirements, if they resign before their shares are fully vested, the company will typically buy back the unvested portion at par value. |
| What is the difference between restricted stock and stock options? | Restricted stock represents actual owned shares subject to vesting and repurchase. Stock options represent the right to purchase shares at a set strike price once they vest. |
| What is a vesting cliff? | A vesting cliff is a period (usually one year) during which no shares vest. Once you pass this cliff, a lump sum of your equity vests, followed by steady monthly vesting. |