Your SpaceX IPO Game Plan: What to Decide First—and What Can Wait

By the time you read this, the IPO filing for SpaceX is likely to have already started (S-1 filing article).

SpaceX has been moving toward an IPO for months — quiet period entered in December, tender at $421/share in January, the xAI merger in February, and the above S-1 filing rumors; an IPO prospectus filing is imminent. A June 2026 listing (rumored to be at a valuation of as much as $1.5 trillion valuation) isn't speculation anymore. It's a planning horizon.

And if you're a SpaceX employee, that means the window between "I should probably figure this out soon" and "I need a plan right now" just closed.

Here's the thing: most of the decisions you're facing aren't actually that hard once you sequence them correctly. The reason people make expensive mistakes around IPOs isn't usually a lack of intelligence — it's poor sequencing. They focus on the exciting decisions (how much should I sell?) before making the critical ones (which shares can I even sell, and when?). They optimize for tax before they've dealt with investment risk. They get paralyzed by optionality and end up making no decision at all.

This article is the map. Not every detail — each decision gets its own deep guide in this series. But before you can use those guides, you need to understand which decisions are on the critical path, which can wait, and what a first-30-days plan looks like by grant type.

The Decision Landscape You're Actually Navigating

Most SpaceX employees are looking at some combination of the following:

• RSUs that vested and created W-2 income (you already own some shares)

• ISOs — tax-complex options with AMT implications, qualifying disposition rules, and in SpaceX's case, a tainting rule you absolutely cannot get wrong

• NSOs — simpler options than ISOs, but still consequential

• ESPP shares — a great wealth builder if you participated; need to ensure you've met the qualifying period before sale to maximize the tax benefits

Every one of those has a different tax treatment, a different optimal sequencing, and a different set of decisions that must happen before the IPO window opens. That's before you layer in lockup periods, blackout windows, insider designations, and the timing of when things actually become liquid.

The goal of this article is simple: help you understand which of these decisions are time-sensitive and irreversible, versus which ones you can afford to take more time on.

The Critical Distinction: Reversible vs. Permanent

Not all decisions are equal. Some things you can adjust later. Others you cannot undo.

Irreversible (or very hard to unwind):

• ISO exercise decisions — once you exercise and create an AMT bill, you can't un-exercise. The cash is out the door, the tax clock has started, and the holding period has begun. If you exercise incorrectly — or exercise change your mind and trigger a disqualifying disposition on your entire grant — that damage can't be reversed. SpaceX has a particularly painful version of this rule: one disqualifying disposition can taint the rest of your ISO grant (become an NSO). That's not a typo. I've seen an employee accidentally convert a $3 million ISO grant into NSO tax treatment by selling a small $20k position without understanding what they were doing.

• ISO qualifying disposition timing — to get favorable long-term capital gains treatment on ISOs, you need to hold shares 1 year after exercise and the grant must be 2 years old before you sell. You can't retroactively start the clock.

• Post-termination exercise window — if you leave SpaceX, the standard window to exercise vested options is 60 days. After that, they expire worthless. This is one of the most commonly "ignored until too late" time bombs I see with employees who decide to leave around a liquidity event.

Reversible (or at least adjustable):

• How much to sell post-lockup and over what timeline

• Which tax lots to prioritize when you do sell

• What to invest proceeds in

• Whether to hold some SpaceX long-term

• Most of your financial planning decisions that don't require acting before IPO

This distinction matters because it tells you where to spend your attention. The irreversible decisions need to happen before the IPO window opens. The reversible ones can be refined as you go (though all else equal, the sooner you plan the better)

The Decision Map: What Matters Now vs. What Can Wait

Here's how I think about sequencing for SpaceX employees right now.

Do These Before the IPO (Or Very Soon After):

1. Map your complete equity inventory

Before you can make a single good decision, you need to know exactly what you have. This sounds obvious. It almost never happens. I'm talking about a full picture: every grant, every grant date, the strike price on each, how many shares are vested versus unvested, which are ISOs versus NSOs, your ESPP participation history and qualifying/disqualifying status on existing lots, and your AMT payments, carry forward credits, and applicable ISO tax lots (if you've exercised ISOs before).

Most people have a rough sense of this. But some don't, and others risk missing something important. This is most likely the biggest wealth generator you'll have in your lifetime; it's worth the time.

2. Understand your lockup, blackout, and IPO selling dynamics

If SpaceX IPOs in June 2026, the standard 180-day lockup takes you to approximately December 2026. But...there could multiple ways you can sell earlier than that, and also restrictions on selling after its over:

1. Potential to sell at/during the IPO. Some companies allow employees to sell a portion of their shares on/around the IPO. Typically either (i) at the IPO price, or (ii) within the first few days after the IPO. 10-20% of holdings is typical if this is allowed

2. The lockup may be atypical/allow earlier selling. A 180-day lockup is market standard, but these have evolved some the last few years. Some allow partial selling at 90 days, or after the first earnings call, or if the stock does well (e.g. price is above a threshold for more than 20 days).

3. Blackout periods will likely still apply after the lockup is over. You are still likely to be restricted via a "blackout period" every quarter (typical company policy to protect against insider trading). Assume roughly 5-9 weeks out of a every quarter you're blocked.

Last, if you're a senior leader and/or privy to sensitive financial info -- you may be designated as "pre-clearance individual" who needs internal approval before selling. There are solutions for that (10b5-1 plan), but knowing this in advance will be really helpful.

3. Make your ISO exercise decisions (if any)

This is the most technically complex and time-sensitive decision for most SpaceX employees with meaningful ISO holdings. At current valuation of $1.25T, and a rumored $1.5T-plus IPO valuation, almost any ISO exercise is going to trigger AMT — often a significant amount. The question is whether to exercise some or all of your ISOs before the IPO, and if so, how many, which lots, and with what AMT strategy.

I'll go deep on this in the Exercise Strategy and ISO/AMT articles in this series. But the reason it lands here on the "do before IPO" list is that it interacts directly with your tax year, your cash position, the qualifying disposition clock, and your AMT credit strategy for years afterward. The later you wait, the fewer options you have.

4. Understand the SpaceX-specific ISO tainting rule

I'm mentioning this separately because it's that important. At most companies, exercising a portion of an ISO grant and making a disqualifying disposition on those shares only affects those shares. At SpaceX, there is a contractual provision in their option grants that means a disqualifying disposition on any portion of an ISO grant taints the entire grant — all remaining shares lose preferential ISO tax dynamics and become NSOs.

Before you make any move involving your ISOs — including participating in future tender offers, selling in the IPO, or exercising and selling in the same year — you need to understand which shares would be qualifying and which would not. This is not a gray area. It is a very clear and very expensive binary.

These Can Come Later (But Should Still Get Planned):

5. Build your selling plan

How much to sell, over what timeline, using which framework, and how much SpaceX stock to keep — are critically important but not time-critical in the same way. Excepting an amount you're able to sell at or around the IPO, you have from through lockup expiration to finalize this. The key is that you want this plan written down before the lockup expires, not after. Decisions made under the pressure of watching a stock move are worse than decisions made in advance. But you don't have to have the perfect plan today.

6. Tax optimization on the sell-down

Lot selection, charitable strategies, tax-loss harvesting, DAFs, exchange funds — all of these are powerful tools, and I cover them in detail in the Tax-Smart Diversification article. But they come after you've determined investment goals and risk tolerance. Tax strategy that "wags the dog" is how people end up with a suboptimal financial outcome that happened to have a lower tax rate.

7. Investment allocation of proceeds

Once shares are liquid and proceeds from sales start coming in, what do you invest them in? This depends on your time horizon, your goals, your other assets, and how much SpaceX you're keeping. This is a real decision, but it's one you can make thoughtfully over the months post-IPO.

The First-30-Days Checklist (By Grant Type)

Here's a practical checklist to work through in the next 30 days. Not a to-do list for the IPO day — a now list, while you still have optionality.

If you have ISOs:

• Calculate the approximate bargain element on your vested ISOs at current implied valuation (~$1.25-1.5T)

• Estimate your potential AMT bill at different exercise scenarios (even rough numbers help)

• Identify whether any of your existing ISO lots are already qualifying dispositions (exercised 1+ year ago, grant 2+ years old)

• Verify you understand SpaceX's ISO tainting provision before making any move

• Decide whether you want to exercise any ISOs pre-IPO (and if so, how many and which lots)

• Ensure you have the cash available to fund the exercise cost + estimated AMT

If you have NSOs:

• Understand your net spread and what ordinary income recognition would look like at exercise

• Identify any NSOs that are deep-in-the-money with limited option leverage value

• Consider whether exercising any NSOs is desired (for most the answer is no, but it can be a yes in a few situations)

If you have RSUs:

• Understand your withholding election — the standard 22% supplemental rate is almost certainly not enough; you'll likely want to elect 37% (unless you are extremely bullish on SpaceX and desire to take the risk)

• RSUs that are already vested: you own the stock; no action required before IPO, but include them in your selling plan

If you have ESPP shares:

• Identify which lots are qualifying dispositions versus disqualifying (your Shareworks statement specifies this; which is helpful)

• Note that qualifying ESPP shares typically have favorable tax treatment — factor this into your selling order when the time comes

For everyone:

• Build or update your full equity map (all grants, dates, types, strike prices, vested/unvested counts)

• Understand your insider/pre-clearance designation status

• Get a rough sense of your AMT credit carryforward from prior year ISO exercises (if any)

The Biggest Mistake I See

I've advised on more than $500 million in equity compensation. And the most common expensive mistake isn't a bad tax decision or a poorly timed sell.

It's doing nothing because it felt too complicated.

The people who do the best aren't necessarily the ones who optimize every variable. They're the ones who made a plan — even an imperfect one — before the window opened, and executed it without emotion. The people who do worst are the ones who watched the stock, kept thinking "I'll figure this out soon," and then made decisions reactively when they were under pressure.

You now have a potential window: the IPO filing is imminent, which means you have months — not years — before the first sell window opens. That's actually enough time to do this right.

The point of planning isn't to predict what SpaceX will do after IPO. It's to make sure that whatever happens, you're not surprised by it.

What's Next in This Series

This article is the map. The other nine articles in this series go deep on the individual decisions:

• IPO Timeline Reality: Lockups, Blackouts, and What the First Year Really Looks Like — the actual mechanics of when your shares become liquid

• The Cost of Inaction: What "Wait and See" Can Really Cost You — why the people who "just hold" often end up with worse outcomes than those who had a plan

• Liquidity Planning: How Much to Sell, How Fast, and Why — the framework I use with every client for building a no-regrets selling plan

• Holding SpaceX After IPO: How to Build Around It Like an Institutional Investor — for those who want to keep a meaningful position intentionally

• Exercise Strategy: How Many Shares, Which Date, What Risk You're Really Taking — the ISO/NSO exercise decision in full

• ISOs and AMT: Estimate It Before You Trigger It — Then Reduce and Recover It — the AMT mechanics, the strategies, the multi-year recovery plan

• Leaving SpaceX: The 90-Day Window and the Exercise-vs.-Walk-Away Decision — for anyone considering departure around the IPO

• Tax-Smart Diversification: The Real Tools That Can Improve Outcomes — lot selection, charitable strategies, exchange funds, and when advanced tools actually help

• Don't Let Taxes Make the Biggest Decision for You — the philosophy article; why life plan comes first