SpaceX IPO (SPCX): What Employees Should Do With Their Equity Now

SpaceX priced at $135 per share on June 12, 2026 — the largest IPO in Wall Street history — and opened on Nasdaq under ticker SPCX. If you hold RSUs, stock options, or restricted stock as a current or former employee, the next 180 days are the most consequential financial planning window of your career. And the first tax deadline is in two days.

What happened to your equity at IPO

Double-trigger RSUs

Most SpaceX employee RSUs used a double-trigger vesting structure: shares vest only when both a time-based schedule and a liquidity event (IPO or acquisition) are satisfied. The IPO on June 12 fired the second trigger for all RSUs that had already met their time condition.

What this means in practice:

1. Settlement (1–3 business days): Your equity plan administrator processes the release. Shares appear in your brokerage account — likely June 12–16. You cannot sell them during lockup, but they are yours and the tax event has already occurred.
2. Ordinary income at settlement: Under IRC § 83(a), you recognize ordinary income equal to the fair market value of the shares on the settlement date — likely the IPO price ($135) or the market price on settlement day.¹ Your employer withholds at the 22% federal supplemental rate plus Medicare plus applicable state taxes.
3. Your cost basis is set: The FMV on settlement day becomes your cost basis for all future capital gains calculations. The long-term capital gain holding period clock (12 months) starts on settlement day — not your original grant date.

Unexercised stock options (ISOs and NSOs)

If you hold unexercised ISOs or NSOs, the IPO itself is not a tax event for the options. What the IPO changes is your liquidity and your decision timeline:

• ISOs: You may exercise during the lockup period (you just can't sell the resulting shares). Exercising now starts the 1-year long-term capital gain clock and the 2-year ISO qualifying-disposition clock. You pay AMT on the spread at exercise, but no ordinary income — and you recover AMT credit in future years. With 180 days of lockup, you have a window to exercise ISOs and be partway through the qualifying-disposition holding period before you can sell. Use the ISO AMT calculator to model the tradeoff.
• NSOs: Exercise triggers ordinary income equal to the spread (FMV minus strike price) under IRC § 83, regardless of IPO timing. You can exercise NSOs during lockup, but the resulting shares will still be unsellable until lockup lifts. There is no AMT issue, but the ordinary income tax event happens at exercise.

Previously exercised ISOs

If you exercised ISOs before the IPO and held the shares, you have a holding-period decision when lockup expires:

• If you exercised more than 12 months ago: the 1-year LTCG clock may already be satisfied. Check whether you've also held 2+ years from the grant date — if so, a post-lockup sale qualifies for LTCG rates (0–20% federal + 3.8% NIIT).
• If you exercised within the past 12 months: selling within 12 months of exercise is a disqualifying disposition — the spread is taxed as ordinary income (up to 37% federal), not LTCG. You may want to hold past the 12-month mark even if that extends beyond Day 181.

The staggered lockup schedule

SpaceX did not use a traditional single-cliff 180-day lockup. Instead, the company structured a staggered release designed to prevent a single wave of selling. The schedule has five components:²

Important: The release dates above are calculated from the June 12, 2026 pricing date and are approximate. Verify your specific lockup terms against your grant agreement, offer letter, or the lockup agreement you signed. Trading blackout windows around earnings may restrict your ability to sell even after lockup lifts.

Your tax picture

The withholding gap on RSU settlement

SpaceX's payroll processor withholds at the IRS supplemental rate — 22% federal for income under $1 million from the employer, 37% above that threshold — plus Medicare and applicable state taxes. For most employees with large RSU settlements, the 22% rate is well below the real marginal rate:

For a California resident in the top bracket with $600,000 of RSU income: real marginal rate is approximately 37% + 2.35% + 13.3% = 52.65%. At 22% withholding, the gap on $600,000 is roughly $183,000 owed beyond what was withheld. Use the RSU tax calculator to run your specific numbers.

Estimated tax deadlines for 2026

The IRS imposes an underpayment penalty if you don't pay enough tax during the year. For a large RSU settlement in June, the relevant deadlines are:³

• June 16, 2026 (Q2 deadline — this Monday): Covers income recognized April 1–May 31. RSUs that settled in early June may fall here depending on how the quarter is treated. Making a large payment now is the safest move.
• September 15, 2026 (Q3): If you miss or underpay the June deadline, additional payments here reduce the penalty.
• January 15, 2027 (Q4): Final installment. At this point you may also file early (by January 31) to avoid this payment entirely.

Safe harbor: pay 100% of your 2025 tax liability (110% if 2025 AGI exceeded $150,000) and avoid penalties entirely — even if you owe more in April. For most SpaceX employees with large RSU settlements, the current-year 90% track is more appropriate since 2025 income likely understates 2026 dramatically.

What to do during the 180-day lockup window

1. Make the Q2 estimated tax payment now

Set aside the withholding gap and wire it to the IRS via EFTPS or IRS Direct Pay before June 16. This is the single highest-priority action for any employee whose RSUs settled this week. It takes 15 minutes and eliminates penalty exposure. Also contact your payroll department to temporarily increase W-4 supplemental withholding for any remaining 2026 vest events.

2. Confirm and document your cost basis

The per-share FMV on your RSU settlement date is your cost basis for every capital gains calculation going forward. Your brokerage should auto-populate this, but errors are common — particularly in IPO situations where equity platforms are processing tens of thousands of grants simultaneously. Verify now, not in March 2027 when you're preparing taxes. See the RSU tax reporting guide for the W-2 box-by-box breakdown and the 1099-B cost basis double-counting trap.

3. Model your ISO decisions during lockup

If you hold unexercised ISOs and you have AMT headroom, the lockup period is your window to exercise before you can sell. Exercising now:

• Starts the 1-year LTCG clock. Shares held past Day 365 qualify for LTCG rates on any appreciation above your exercise price.
• Starts the 2-year ISO qualifying-disposition clock. A sale more than 2 years after grant and more than 1 year after exercise avoids ordinary income on the entire spread.
• Creates an AMT preference item equal to the spread (FMV at exercise minus strike). You pay AMT tax now, but recover it as an AMT credit when your regular tax exceeds your AMT in future years.

The math is complex and depends on your specific spread, current price, AMT credit carryforward, and probability that the stock price holds. Use the ISO AMT calculator and verify with an advisor before exercising.

4. Set up a 10b5-1 plan now

Under the SEC's amended Rule 10b5-1 (effective 2023), corporate insiders must observe a cooling-off period — 90 days for directors and officers (up to 120 days), 30 days for other employees — after adopting a 10b5-1 plan before any trades can execute.⁴

For SpaceX employees who adopt a plan today (June 13), the 30-day cooling-off period ends July 13 — well before the first time-based lockup release on August 21. For officers and directors, a plan adopted now satisfies the 90-day cooling-off requirement before Day 90 (September 10).

A 10b5-1 plan lets you sell shares on a predetermined schedule without being in an open trading window. Given that earnings blackout periods will surround the post-Q2 and post-Q3 earnings releases, a properly structured plan is the only way to sell during those windows. See the full guide: 10b5-1 Trading Plans: Setup, Timing, and 2023 Rules.

5. Think through your concentration risk

After your RSUs settled, what percentage of your investable net worth is in SPCX? The company went public at a $1.8 trillion valuation and opened 19% above the IPO price — you may feel like holding is the obvious move. But concentration risk is the most common wealth-destruction pattern among pre-IPO employees: they watch the stock double, then watch it fall 60%, and make no decision either way.

A disciplined sell-down plan during the staggered lockup releases — not a panic sale, not a hold-forever — is what converts IPO equity into durable wealth. The concentrated stock diversification calculator can model a year-by-year tax-efficient sell schedule across your post-lockup tranches.

6. Consider your state tax situation

If you are a former SpaceX employee who moved states between your grant date and the IPO, your RSU income may be subject to California source-income rules (FTB workday allocation formula) even if you're now a resident of Washington, Texas, or another no-income-tax state. California taxes nonresidents on income allocable to days worked in-state during the grant-to-vest period. See the RSU state tax guide for the exact formula.

SpaceX employee equity: quick-reference checklist

1. ☐ Make Q2 estimated tax payment by June 16 (EFTPS or IRS Direct Pay)
2. ☐ Verify RSU settlement shares and cost basis in your equity platform account
3. ☐ Calculate withholding gap: (real rate − 22%) × settlement FMV
4. ☐ Update W-4 Step 4(c) for additional withholding on remaining 2026 vests
5. ☐ For ISO holders: model AMT impact of exercising during lockup (use the calculator)
6. ☐ Adopt a 10b5-1 plan now — cooling-off period starts today, ends before first tranche
7. ☐ Map your lockup release dates on a calendar against earnings blackout windows
8. ☐ Build a sell-down plan across the staggered tranches — don't wait until Day 180
9. ☐ If you moved states between grant and IPO: assess CA/NY nonresident allocation exposure