SpaceX's 12 Billion Share Lock-Up Expires on 9 December 2026

What a Lock-Up Is, and Why the Date Is Knowable in Advance

When a company goes public, only a slice of its shares are actually sold into the offering. Everything else — founder stock, employee equity, venture rounds — stays locked. The underwriters require it as a contractual condition, because a flood of insider supply in the first weeks of trading would destroy the offering they just priced.

The standard structure is a 180-day cliff: nothing can be sold for 180 days, and then everything becomes eligible at once. The agreement is written into the prospectus, so the date is public from day one. Across the 75 deals we currently track, structures break down as 67 plain cliffs, 3 “earlier-of” arrangements (whichever of two conditions arrives first), 1 staged release, and 4 we could not classify confidently.

And the expiry does not permit unlimited selling. Affiliates remain subject to Rule 144 volume limits, and most companies have blackout windows around earnings. “Eligible to sell” is not “free to dump.”

Who Is Locked Up, and What Each Group Does Next

“Insiders” is doing a lot of work in most lock-up coverage. The locked block is not one constituency, and the groups inside it behave completely differently once the restriction lifts. Pricing a lock-up expiry without disaggregating them is the single most common analytical error in this area.

Venture and growth investors

These are funds with a legal obligation to return capital to their own limited partners, and a position that may represent a large share of one fund's entire value. They are the most likely genuine sellers — but they are also the least likely to sell on the open market. A fund holding billions of dollars of stock sells through a registered secondary offering or a block trade negotiated with a bank, because dribbling it into the tape would move the price against itself. That is why a lock-up expiry is often followed by a secondary offering announcement rather than by visible selling pressure, and why the offering is the news, not the expiry.

Founders and executives

Usually the least likely to sell in size, for reasons that have nothing to do with sentiment: concentrated stakes, control considerations, signalling risk, and in many cases a separate contractual arrangement that extends well past the standard 180 days. Where they do sell, it is typically through a pre-arranged plan adopted after the lock-up lifts, which is both disclosed and deliberately boring.

Employees

The most reliably motivated sellers, individually small and collectively meaningful. Many have most of their net worth in one stock and a tax bill attached to it. Two mechanical features matter here:

• Sell-to-cover. When restricted stock units vest, shares are commonly sold automatically to pay withholding tax. This produces supply regardless of whether anyone wanted to sell, and it clusters on vest dates.
• Option exercise windows. Employees holding options that have been in the money for years, with expiry dates approaching, face a deadline the market does not care about.

Cross-over and pre-IPO public funds

Funds that bought the last private round and also hold public equities. Their decision is a relative-value one: they sell if they have better uses for the capital, and hold if the position still clears their bar. The least predictable group, and the one most sensitive to what the stock has done since the IPO.

The Rules That Still Apply After the Lock-Up Lifts

A lock-up is a private contract with the underwriters. Securities law is a separate layer that does not expire with it, and it constrains exactly the holders most people worry about.

Rule 144

Restricted and control securities are resold under Rule 144, which imposes conditions that bite hardest on the largest holders:

• A holding period before restricted shares can be resold at all — six months for a reporting company.
• A volume cap for affiliates. Officers, directors and large holders are limited, per rolling three-month period, to the greater of 1% of the outstanding shares or the average weekly trading volume over the preceding four weeks. This is the single most important fact about any large lock-up expiry: the biggest holders cannot legally sell quickly on the open market even if they want to.
• Manner-of-sale requirements and a notice filing (Form 144) above modest thresholds, which is itself a public, trackable signal.
• Current public information about the issuer must be available.

Non-affiliates holding for long enough eventually escape most of this. Affiliates do not. So when a headline says twelve billion shares become sellable, a large fraction of that block is in hands that face a volume cap measured against the same average volume the absorb-day calculation uses.

Registration rights

This is the escape hatch, and it is why the volume cap does not end the story. Most pre-IPO investors negotiated registration rights years before the offering: the contractual power to compel the company to register their shares for resale, which moves the sale out of Rule 144 and into a registered offering with no volume cap. A demand right lets a holder force the process; a piggyback right lets them join an offering the company is already doing.

The practical sequence this produces: lock-up lifts → a large holder exercises registration rights → a resale shelf or secondary offering is filed → a block is placed at a negotiated discount to the market price. The discount on that block, not the expiry date, is where the price impact actually shows up.

Blackout windows

Company insider-trading policies typically prohibit selling in the weeks before an earnings release. If a lock-up expiry falls inside a blackout, the effective start of insider selling is pushed out to the open window after results — often weeks later than the calendar date everyone is watching. This is a routine reason expiries pass quietly and then supply appears later, and it is why we record the expiry date and the earnings calendar together.

The Only Metric That Matters: Absorb Days

Headlines report lock-up expiries in share counts or dollar values. Both are close to useless on their own, because they say nothing about whether the market can take the supply. A billion shares unlocking in a stock that trades a billion shares a day is a non-event. Twenty million shares unlocking in a stock that trades two hundred thousand a day is a problem.

That is the whole idea. It converts an unlockable block into a unit the market can be compared against. We bucket the result into three bands and compare each deal against its cohort — the 47 publishable deals in the current window, whose absorb-day distribution runs from a lower cutoff of 53.0 to an upper cutoff of 79.3.

• Light — below roughly 53 absorb days. The float can plausibly take it.
• Middle — between about 53 and 79. Genuinely ambiguous, and we usually decline to call these.
• Heavy — above roughly 79 absorb days. Supply materially exceeds what the stock normally trades.

Two caveats we apply to ourselves. Average daily volume for a newly public company is measured over a short, unusually active history, so it tends to overstate the market's steady-state capacity — which means absorb days tend to be understated. And the share count is almost never printed directly; it is derived as shares outstanding after the offering less the shares sold in it. We only publish a deal when we have read the actual prospectus language and the stock clears liquidity minimums of $1M dollar volume over at least 20 sessions.

SpaceX: The Numbers

SpaceX priced at $135 and trades at $162.57, up 20.4% from the offer. Its 180-day cliff lands on 9 December 2026.

Nearly 12 billion shares against 95.8 million of average daily volume gives 124.9 absorb days — firmly in the heavy band, and at the 87th percentile of its cohort. In plain terms: if every unlocked holder wanted out, clearing the block at current volumes would take about half a trading year.

Why This Particular Expiry Has No Real Precedent

SpaceX listed on Nasdaq on 12 June 2026 at $135 a share, in the largest initial public offering ever completed, at a valuation around $1.77 trillion. Count 180 days forward from the listing date and you land on 9 December 2026 — which is exactly the date in the filings. The arithmetic is worth doing yourself, because it is the cleanest possible confirmation that this is a standard cliff and not a bespoke arrangement.

What makes it unusual is not the structure. It is the proportion.

Run the same figures the other way and the liquidity picture looks far less alarming. Average daily volume of 95.8 million shares against a float of roughly 1.15 billion means something close to 8% of the float changes hands every single session. By the standard of newly public companies that is extraordinarily active trading, and it is why the dollar volume reaches $15.6 billion a day despite the small float.

The two readings, stated fairly

We are not resolving that disagreement here, and we would be inventing confidence if we tried. What we will say is which of the two the structure favours: the affiliate volume cap and the registration-rights pathway described above mean that if the bearish case plays out, it will arrive as a priced secondary offering rather than as open-market selling. Watch the filing calendar, not the tape.

How 2,450 Filings Become 47 Publishable Deals

Most of the work in lock-up tracking is throwing things away. The funnel for the current window:

Of 283 issuers identified, 178 are withheld — because the prospectus language was ambiguous, the share count could not be derived reliably, or the stock failed the liquidity floor. Withholding is the normal outcome. A lock-up tracker that confidently reports a number for every IPO is guessing on most of them.

What each stage actually rejects

1. 2,450 filings → 283 issuers. The raw filing stream is mostly amendments, withdrawals, and multiple documents for the same deal. Deduplicating to distinct issuers removes the bulk of it.
2. 283 → 225 considered. Drops deals that never priced, withdrew, or fall outside the search window of 26 October 2025 to 29 August 2026 — the range of IPO dates whose 180-day cliffs can land in the period we care about.
3. 225 → 97 prospectuses read. The expensive step. A lock-up term can only be established by reading the agreement language, so anything without a retrievable, readable prospectus stops here.
4. 97 → 75 covered. Requires both an unambiguous expiry date and a derivable share count. The share count is the usual failure: it is almost never printed, and must be computed as shares outstanding after the offering less the shares actually sold in it.
5. 75 → 47 publishable. The liquidity gate: at least $1 million of dollar volume across at least 20 sessions. A stock that does not trade has no meaningful denominator, so its absorb-day figure would be an arbitrarily large number rather than information.

Roughly one IPO in six that enters this funnel comes out with a number we are willing to print. If that seems like a low hit rate, it is the point. The 178 withheld deals are the ones where a published absorb-day figure would have been a guess dressed as a measurement.

How We Will Be Scored — Including the Part That Is Embarrassing

Anyone can describe a lock-up expiry after the fact. The only way to know whether a framework works is to write down the call before the date, freeze it, and then grade it against a benchmark you did not choose afterwards. That is what the scoreboard is for, and here is exactly how it is specified.

One more honesty note on the thresholds themselves. The light, middle and heavy cutoffs are cohort-relative — derived from the distribution of the current 47 publishable deals, with a lower cutoff at 53.0 absorb days and an upper at 79.3. They are not absolute constants discovered in historical data. As the cohort changes, the cutoffs move. This makes the bands a reasonable way to say “heavy relative to comparable deals right now,” and an unreasonable way to say “heavy in some universal sense.”

What Is Expiring Next

SpaceX is the headline, but 45 expiries are scheduled ahead. The next several weeks, with absorb days:

XE illustrates why share counts mislead. It unlocks 348 million shares — the largest block in this list by a wide margin — and still sits in the light band at 53.0 absorb days, because it trades enough volume to take it. SPTX unlocks 39 million, a ninth as many, and lands at 120 absorb days. Rank by absorb days, never by share count.

The ten calls currently on record

We write each call before the expiry, store it in an append-only ledger, and grade it afterwards against SPY at 5 and 21 trading days. Calls are frozen at the moment they are issued, which is why a call's absorb-day figure can differ from the live deal record — volume keeps moving, the call does not.

Four pressure calls, six absorbed, each issued between 16 and 44 days before the event. The naive baseline we grade against is “every unlock gets absorbed, no exceptions” — which, across these ten, would have called all ten absorbed. Our four pressure calls are therefore the entire bet: if the unlocks at ALMR, AVLN, SPTX and SUJA sail through without underperforming SPY, we were worse than doing nothing.

How to Read Any Lock-Up Expiry in Five Steps

1. Find the actual date in the current filings, not the original S-1. Check for amendments, waivers, and early-release triggers — SpaceX restated its period nine times.
2. Derive the share count as shares outstanding after the offering minus shares sold in it. If you cannot get a defensible number, stop — do not estimate.
3. Divide by average daily volume. This is the number. Everything before it was preparation.
4. Ask who actually holds the locked stock. Venture funds near the end of their life are motivated sellers. Founders with control and employees sitting on large gains in a company they believe in are not. Insider filings after the expiry tell you which it was — our guide to reading insider selling covers how to separate those sales from scheduled plan activity.
5. Remember the date is public. The event is known to everyone. Your edge, if any, is in the absorption estimate — not in the calendar.

Track All 45 Upcoming Expiries

Our lock-up radar reads IPO prospectuses directly from SEC filings, derives the unlocking share count, computes absorb days against live volume, and ranks every tracked deal against its cohort — with the prospectus language quoted so you can check the derivation yourself.

The public call ledger and its scoreboard sit alongside it, including the calls that have not resolved yet.

The Bottom Line

SpaceX releases 11.96 billion shares on 9 December 2026 — about 125 days of average volume, in the heavy band, at the 87th percentile of its cohort. That is a large potential supply event in an extremely liquid stock whose date everybody has known since the prospectus.

Absorb days is the metric. Share counts and dollar values are noise without the volume denominator, which is why XE can unlock nine times more shares than SPTX and present a third of the pressure.

And we have no track record to sell you. Ten calls are on the board, twenty legs are pending, zero have resolved. The scoreboard will answer the question on its own schedule.

All figures as of 12 October 2026. Volume as of 9 October 2026. Calls are frozen at issue and are not revised.