Skip to navigationSkip to main contentSkip to right columnADVERTISEMENTAmanda GerutFri, July 3, 2026 at 12:06 PM GMT+2 7 min readUnless you've been on the moon, you know that Elon Musk's SpaceX just pulled off the biggest IPO of all time and raised about $86 billion in its public stock offering last month. The reusable rocket maker did it while selling only a tiny sliver—between 4% and 5%—of its stock. The other 95%—which consists of about 12.5 billion shares—is being kept behind bars in one of the most byzantine, complicated lock-up schedules in history.To level set, lock-up periods are standard fare following an IPO; founders, top executives, and early venture investors usually agree not to sell their shares for 180 days. The point, as IPO advisor Lise Buyer of Class V Group explains, is twofold. First, it forces the people who know the company best to hold through at least one earnings report, so they can't dump stock on the public right before a bad quarter. Second, it sends a soothing signal during what could otherwise be a volatile and tenuous time in the life of a newly public company. "It's a message to the new buyers that the people who know the company best still believe in it and are going to hang on," said Buyer.But when the lock-up expires, usually right after 180 days, a glut of stock typically hits the market and puts downward pressure on the stock price. During the past decade, underwriters have pushed buzzy tech companies into adopting more staggered or shortened release dates for insiders to sell their shares, some even contingent on earnings or stock-price increases to dampen the flow. Airbnb, DoorDash, Reddit, and Snowflake all either shortened the 180 days or staggered them. SpaceX, however, took the flexible lockup approach, wrapped it in a puzzle, strapped it to an enigma, and sent it to live in a colony on Mars.There are 15 dates for sales in the public markets, according to the company's filings. For anyone who isn't Musk or a large investor, they can sell their stock during the 180-day window as it unlocks in slices of 7% on various dates in August, September, and October and then two trading days after SpaceX's Q2 2026 earnings, which will be its first as a public company. There's another big tranche after its next earnings report, and then whatever is left can be sold at 180 days. There are also dates tied to other earnings releases, plus stock-price increases.Avery Marquez, who tracks IPOs and lock-up structures as director of investment strategies at Renaissance Capital, described just how much of an outlier this is: "This is one of the most complicated, if not the most complicated lock-up we've ever seen."Terms and Privacy PolicyEU DSA contactPrivacy & Cookie SettingsMore Info