Leaving Anthropic Before IPO: Your Equity at Stake

By Joe Forish, CFA, CFP®|Published On: Sep 21, 2026|Categories: Financial Planning|

Someone just slid into your DMs with an offer you can’t ignore. Or you’ve spent six months quietly miserable at your desk, watching the Anthropic IPO calendar like a countdown clock. Or maybe the work is extraordinary AND the opportunity across the table is extraordinary, and you genuinely don’t know which path leads where you want to go. Either way, if you’re thinking about leaving Anthropic before the IPO, the financial stakes are higher than most people realize — and the timing decisions are more consequential than any offer letter will tell you.

Whatever your situation, one question sits underneath all of it: how much does leaving cost you?

If you’re weighing leaving Anthropic before the IPO, that question has a specific – and very large – answer. At a company approaching a near-trillion-dollar valuation with an IPO expected in October 2026, your departure date functions less like an administrative detail and more like a financial decision worth millions. Every category of equity responds differently to your resignation date. Getting the timing wrong by just 30 days can cost you more than most people earn in a year. (Yes, really. We’ll get specific.)

This guide covers exactly what happens to each type of Anthropic equity upon resignation, why the 90-day post-termination window is the most financially dangerous period of your career, and how to approach any departure decision with your eyes open.

This article is for informational purposes only and does not constitute tax, legal, or employment law advice. Please consult a qualified CPA, employment attorney, and CFP® professional before making any departure-related financial decision.

Why Leaving Anthropic Before the IPO Is a Financial Decision, Not a Calendar Decision

Departure timing feels like a People Team conversation. In reality, it’s a financial one.

The equity you hold at Anthropic falls into distinct categories, and each responds differently when you resign. A departure 30 days too early can cost you millions in equity that was weeks away from vesting or settling. Leaving at the right moment, however, doesn’t mean staying forever – it means choosing your timing with full knowledge of what sits on each side of the line.

The October 2026 IPO creates a hard financial inflection point for every component of your compensation. Double-trigger RSUs – which require both time-vesting and a qualifying liquidity event – can represent the single largest component of your Anthropic package. Until the IPO fires the second trigger, those RSUs sit in a complicated limbo. ISOs and NSOs carry post-termination exercise windows that translate into real cash deadlines. The interaction between all of this and the 90-day clock from your last day can transform a well-timed departure into an expensive mistake.

Before you send a resignation letter, you need three numbers. First, the after-tax value of vested equity you can take with you. Second, the value of unvested equity you’re forfeiting. Third, the deadline by which you must act on the vested portion. Most people know none of these with any precision when they resign. That gap – more than any single timing error – is what separates a costly departure from a calculated one.

What Happens to Your Equity When Leaving Anthropic Before the IPO

ISOs: The 90-Day Tax Treatment Window

Incentive Stock Options come with two distinct clocks after termination, and confusing them is one of the most expensive mistakes departing employees make.

The exercise window clock. Your stock plan documents establish how long you have to exercise vested ISOs after termination. Many plans set this at 90 days. Some companies have adopted extended post-termination exercise windows – sometimes as long as five or ten years from the grant date. Check your specific grant agreements, because this is a plan-level provision, not a statutory requirement. Anthropic’s equity plan documents, accessible through your equity portal, specify your exact window. Do not assume 90 days without verifying.

The ISO tax treatment clock. This one is statutory and non-negotiable. Under IRC §422, ISO tax treatment – meaning the spread flows into AMT rather than ordinary income – applies only if the exercise occurs within three months of your termination date. After three months, you can still exercise if your plan allows a longer window. However, that exercise then gets taxed as an NSO: the spread becomes ordinary income at your full marginal rate, with no AMT complexity and no long-term capital gains preference on the spread.

For Anthropic employees with early-vintage exercise prices against a near-trillion-dollar valuation, that distinction can represent hundreds of thousands of dollars in additional tax. Even if your plan allows two years to exercise, the favorable tax treatment disappears on day 91.

Before you resign, calculate exactly how much it costs to exercise all vested ISOs within 90 days – the exercise price itself plus any resulting AMT liability. That sum is your exercise budget. You need to fund it from sources you control before departure, not from shares you can’t yet sell.

NSOs: The Same Window, Different Math

Non-Qualified Stock Options carry the same post-termination exercise window as ISOs – typically 90 days, sometimes longer under an extended window plan. The tax mechanics, however, are simpler: the spread is ordinary income on exercise, regardless of when you exercise after termination. There is no preferential tax window to lose.

The practical challenge for NSOs is cash. If your NSO spread is large – as it can be for Anthropic employees with early-vintage exercise prices – exercising within 90 days requires real money: the exercise price plus estimated taxes, without any ability to sell shares immediately if the company hasn’t yet gone public.

Post-IPO departures eliminate this liquidity problem, since you can do a same-day cashless exercise and sell enough shares to cover both the exercise price and withholding. Pre-IPO departures, however, require you to fund the exercise from outside savings, just as you would while still employed. Therefore, treat this as a pre-departure planning task – not something to figure out after your last day.

Double-Trigger RSUs: The Biggest Risk When Leaving Anthropic Before the IPO

This is where most employees who are leaving Anthropic before the IPO encounter the sharpest financial consequence. It’s also where the IPO timing creates the most dangerous scenario.

Standard double-trigger RSUs vest in two stages. The time-based vesting condition establishes when shares become eligible. The liquidity event condition – the IPO, in Anthropic’s case – actually causes settlement and delivery of shares. Both conditions must be satisfied for shares to vest and settle.

If you leave Anthropic before both triggers fire, the treatment of your unvested RSUs depends entirely on your plan documents. The most common outcome: unvested RSUs are forfeited in full upon termination. You receive nothing – no payment, no cash settlement, no partial credit for time served since your last cliff. The unvested equity disappears.

The IPO timing makes this particularly acute. Consider an employee whose RSU grant has fully satisfied the time-vesting condition – all four years of the schedule have run – but who resigns in September 2026, a month before the October IPO. If the plan requires active employment at the time of the liquidity event, that departure forfeits those RSUs entirely.

Whether active employment at the liquidity event is a condition of your specific grant is a plan-document question, not a general rule. Some RSU agreements allow post-termination settlement when the time-vesting condition has already been satisfied. Others require active employment through both triggers. Pull your RSU grant agreement and read the settlement condition carefully. If the language is ambiguous, have an employment attorney review it before you resign.

Early-Exercised Shares

If you made an 83(b) election and early-exercised options at grant, you hold shares – not options – and those shares don’t expire when a post-termination exercise window closes. However, Anthropic’s stock plan may include a repurchase right on unvested shares. If you leave before completing your vesting schedule, the company can repurchase unvested shares at the lower of your exercise price or fair market value.

If your shares are fully vested, you own them outright upon departure. No repurchase right applies, and no exercise window creates a cash deadline. In that case, your departure date primarily affects the holding period analysis for long-term capital gains purposes. This is generally the cleanest exit scenario – provided you completed both the early exercise and the full vesting schedule.

Three Departure Scenarios: Leaving Anthropic Before, During, and After the IPO

Scenario A: Leaving Six or More Months Before the Anthropic IPO

Leaving Anthropic before the IPO is painful but predictable when your departure is well in advance. You forfeit all unvested equity. RSUs that haven’t time-vested are gone. Your ISOs and NSOs start the post-termination exercise clock from your last day.

One potential advantage exists. You may exercise vested ISOs at the current 409A fair market value, which remains lower than the expected IPO price. If the 409A sits at $180 per share and the IPO prices at $300, exercising vested ISOs at $180 as a departing employee is still advantageous relative to waiting – the AMT exposure is lower, and the cost basis is more favorable for your long-term capital gains calculation.

That said, whether those advantages outweigh the unvested equity you’re forfeiting is a specific calculation. It depends on your grant amounts, your vesting schedule, and the spread between the current 409A and the expected IPO price. For most Anthropic employees with significant unvested equity vesting at or near the IPO, leaving six months early is a steep financial sacrifice. Sometimes the opportunity on the other side justifies it. Go in knowing the full cost.

Scenario B: Leaving Just Before the IPO (The Most Dangerous Window)

This is the most financially dangerous departure window for Anthropic employees. It is also, unfortunately, the one that most often produces regret.

Imagine this: you’ve worked through most of your vesting schedule. The IPO is eight weeks away. Your double-trigger RSUs have fully satisfied the time-vesting condition. Then you resign in September, with an October IPO on the calendar.

If your RSU plan requires active employment at the liquidity event, you’ve forfeited what may be the largest single payout in your compensation history – the settlement of double-trigger RSUs you spent years accumulating – for a departure that came 30 or 60 days too soon. That’s not a planning mistake. That’s a financial gut-punch.

The financial logic in this scenario is almost always clear: delay departure until after the IPO event fires. The cost of staying a few more weeks is real but manageable. The cost of leaving early is potentially millions.

However, one important exception applies. If your plan explicitly provides that RSUs settle at the liquidity event for any former employee whose time-vesting condition was already satisfied, then leaving before the IPO doesn’t forfeit those shares. This provision is uncommon but exists in some plans. Therefore, verify your plan terms before drawing any conclusion – and before you resign.

Scenario C: Leaving After the IPO but During Lockup

If you stay through the IPO event, double-trigger RSUs vest and settle. You receive shares. The lockup period begins.

Leaving during the lockup – after RSU settlement but before the 180-day restriction expires – creates a situation worth understanding clearly. Your vested RSU shares are yours; departure doesn’t affect ownership. However, the lockup agreement may continue to restrict your ability to sell even after you’re no longer employed, depending on how your specific lockup terms are structured. Read those terms before assuming that resignation ends the restriction.

Meanwhile, the 90-day ISO and NSO exercise window restarts from your termination date, now with publicly traded shares as the underlying asset. Because Anthropic is public, you can see the stock price in real time and do a same-day sale upon exercise if you choose. That liquidity eliminates the cash-crunch problem of pre-IPO departure. Still, you’re making a market-timing decision in a compressed window, without the anchor of a stable 409A valuation.

Post-lockup departure – after the 180-day period expires – is the cleanest exit scenario for most employees. RSU shares have settled, the sale restriction has lifted, and you can make exercise decisions with full market information and no artificial time pressure.

How to Negotiate Replacement Equity After Leaving Anthropic Before the IPO

Before you accept any offer from a new employer, you need to know exactly what you’re leaving on the table. For anyone leaving Anthropic before the IPO, that number – the after-tax value of unvested equity you’re forfeiting – is your negotiating baseline. Walking into a compensation conversation without it is like negotiating the price of a car without knowing what you already own.

Build the calculation in three parts.

Unvested ISO/NSO spread. How many unvested options do you hold, at what exercise price, and what is the current 409A fair market value? The spread is what you’re leaving behind. Multiply by your marginal tax rate to get the after-tax forfeiture value.

Unvested RSU value. How many unvested RSUs do you hold? At the current 409A valuation, what is their fair market value? Apply your marginal tax rate to the expected net vesting value.

Double-trigger IPO-trigger RSUs. If any time-vested double-trigger RSUs would settle at the Anthropic IPO if you stayed, include that value separately. Since the October 2026 event date is approximately known, the settlement value is roughly estimable – and it’s real money worth naming explicitly.

Once you have this total, you can have an honest conversation with your prospective employer about what it costs to recruit you. Tools available to bridge the gap include: a cash sign-on bonus, accelerated vesting on new grants, a larger initial grant, or special one-time equity awards. None of these will exactly replicate the tax efficiency of early-vintage Anthropic equity acquired at low 409A prices. However, the economic gap is negotiable, and most employers who want you already know it.

One practical note: cash replacement typically comes as a sign-on bonus with a repayment cliff – usually one to two years. Understand those repayment terms before you sign, because those cliffs are real obligations.

Your Pre-Resignation Checklist Before Leaving Anthropic

Work through these six items before you resign from Anthropic. If you’re leaving Anthropic before the IPO, these steps become even more time-sensitive. None of them require knowing where you’re going next. All of them require knowing what you’re leaving behind.

1. Pull Every Equity Grant Document

From your equity portal – likely Carta – download the grant agreement for every outstanding grant separately: each ISO, NSO, and RSU award. Note the exercise price, grant date, vesting schedule, current vesting status, and the post-termination exercise window. For RSUs, find the section describing the settlement condition and determine whether active employment at the liquidity event is required.

2. Calculate Your Exact Vesting Cliff Dates

Many Anthropic vesting schedules include quarterly or annual cliff dates. Resigning the day before a quarterly cliff forfeits that quarter’s shares. Waiting three additional weeks may add meaningful value. Know your cliff dates before you set your last day – this awareness costs nothing and can be worth a lot.

3. Calculate the 90-Day ISO Exercise Budget

If your plan has a standard 90-day post-termination window, you need cash ready to fund the exercise and the resulting AMT liability before April 15 of the following tax year. Therefore, model this as a pre-departure requirement. Do not resign without a funded exercise plan.

4. Determine Whether the IPO Changes Your Math

If the October 2026 IPO is fewer than 90 days away, ask a specific question: do your unvested double-trigger RSUs settle at the IPO for departing employees whose time-vesting condition has already been satisfied? A yes answer expands your timing flexibility. If no, staying through the IPO event is the financially rational choice in almost every scenario involving meaningful unvested equity.

5. Get the Trade Secret Picture Clear

Before you accept an offer from a competitor, talk to an employment attorney about what you know, what qualifies as a trade secret under California law, and how to navigate the transition without creating liability. That attorney fee is a fraction of what litigation costs – and a smaller fraction still of what it costs to lose.

6. Know the Value of What You’re Negotiating With

Build the full forfeiture calculation – unvested options plus unvested RSUs plus any IPO-trigger equity – before your first substantive conversation with a recruiter. Walking into that negotiation without this number leaves money on the table, and experienced recruiters count on employees not having done the math.

Frequently Asked Questions

What is the 90-day ISO exercise window and when does it start?

For most Anthropic employees, the post-termination exercise window begins on your actual last day of employment – not the end of any notice period, but the termination date itself. The standard window is 90 days, though some equity plans extend this period significantly. More importantly, ISO tax treatment – which allows the spread to flow through AMT rather than ordinary income – is limited by statute to three months from termination, regardless of what your plan says. Exercises after three months may still be permitted under your plan, but the IRS taxes those exercises as NSO exercises: the spread becomes ordinary income at your full marginal rate.

What happens to unvested RSUs when leaving Anthropic before the IPO?

Standard RSU plan language forfeits unvested RSUs upon termination. For double-trigger RSUs specifically, the plan may require active employment at the liquidity event for settlement to occur. If you leave before the IPO and your RSUs require active employment at settlement, you forfeit them – even if the time-vesting condition was fully satisfied before your departure date. Read your specific RSU grant agreement for the exact settlement condition language before you make any decisions.

If I leave before the IPO, do I still receive my RSUs when it happens?

It depends on the plan. Some RSU plans provide that shares settle at the liquidity event for any former employee who satisfied the time-vesting condition before departure. Others require active employment through the liquidity event itself. This is the single most important provision to read before making any departure decision in the 90 days leading up to the Anthropic IPO.

What about trade secrets if I join a competitor?

Trade secret obligations follow you regardless of noncompete enforceability. You cannot take proprietary technology, model weights, training data, or other Anthropic trade secrets to a competing employer. The boundary between “knowledge in your head” and “trade secrets” is genuinely contested in AI research, and enforcement in this space is active and expensive. Consult an employment attorney before you accept a competing offer – and ideally before you begin conversations with competing employers.

Is leaving Anthropic before the IPO worth it just to exercise ISOs at a lower valuation?

Sometimes. If you have vested ISOs at a low exercise price and your unvested equity is limited, exercising at the current 409A valuation before the IPO locks in a favorable basis and lower AMT exposure. However, that calculation must be weighed against the value of unvested equity you’d forfeit by leaving. For most employees with meaningful unvested equity vesting at or near the IPO, staying through the event produces a better financial outcome in expected-value terms.

How do I negotiate replacement equity at a new job?

Build the calculation first: the after-tax value of everything you’re forfeiting. Then have an explicit conversation with your prospective employer about what it costs to recruit you, using that number as the baseline. Ask for a combination of sign-on bonus and accelerated initial vesting rather than a single large grant on a four-year schedule. Also, understand the repayment cliff on any sign-on bonus before you sign, because those terms are real obligations.

What happens to my equity if I leave during the lockup period?

Your departure doesn’t end the lockup restriction on shares you’ve already received. If you received RSU shares at the IPO event, those shares remain subject to the lockup agreement for the full 180-day period regardless of your employment status after the IPO. The 90-day post-termination window for vested but unexercised ISOs and NSOs restarts from your termination date, now using the public market price as the basis for any exercise decision.

Should I tell my financial advisor before I resign?

Yes – and before you resign, not after. The exercise window starts on your last day. If your vested ISO position is large and your plan gives you only 90 days, your advisor needs to model the exercise budget and AMT liability before you make the decision. Advisors who specialize in tech equity compensation can run this analysis in a single session and help you understand the full financial picture of your departure before it becomes irreversible. See our guide to choosing a financial advisor for Anthropic equity for what to look for in that conversation.

Leaving Anthropic – or deciding to stay – is your call. The financial picture in this guide doesn’t make that decision for you, and it shouldn’t. But the 90-day exercise window, the unvested RSU forfeiture rules, and the IPO timing math are not factors that should catch you off guard after the resignation letter is already out the door.

The people who navigate this transition well are the ones who modeled the numbers before they made the call. If you’d like to work through your specific equity picture, Fortrove Partners works with Anthropic employees on exactly this kind of analysis.

Schedule a free consultation with Fortrove Partners →

Leaving Anthropic Before the IPO: What Happens to Your Equity When You Resign?