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SpaceX's IPO structured its insider lock-up around a highly customized, staggered release rather than a traditional, flat six-month restriction. The timeline is designed to gradually increase the public float around specific earnings milestones and performance benchmarks, while completely excluding CEO Elon Musk and major institutional backers from early sales.
The lock-up schedule is especially important because SpaceX’s initial free float is only about 7.4%. That means the vast majority of the company’s share base remains locked at listing and will enter the market gradually.

Core Stakeholder Cohorts
Elon Musk Founder & CEO:
Musk holds approximately 40% of the economic interest and controls 85.1% of the company’s voting power. His shares are subject to an extended 366-day lock-up and are not eligible for any early release. His total stake is up to roughly 6.4 billion shares, which unlocks all at once after the 366-day restriction expires. However, around 1.3 billion shares are tied to performance milestones, meaning that although they may be contractually released from the lock-up, they remain milestone-restricted. As a result, approximately 5.45 billion shares could actually become sellable on the 366-day unlock date.Significant Investors:
Major pre-IPO institutional backers, likely including Alphabet/Google, Valor Equity Partners, and DFJ Growth, are also excluded from early sales. These investors hold around 1.76 billion shares and are subject to an extended lock-up. Their shares do not unlock all at once; instead, they are released in six staged tranches between March 2027 and August 2027.Employees & Early Backers / Regular Shareholders:
These holders, totaling about 4.7 billion shares, are the primary beneficiaries of the staggered early-release timeline laid out in SpaceX’s S-1 filing. Unlike Musk and significant investors, this group can begin selling well before the standard 180-day lock-up expiry.
Staggered Lock-up Timeline
Instead of waiting for the traditional 180-day cliff, employee and early-backer shares unlock in multiple tiers tied to corporate reporting, time-based milestones, and stock-price performance.
First Q2 Earnings Unlock:
Up to 20% of eligible restricted shares can be sold right after SpaceX releases its Q2 earnings call. Earnings calls typically occur between mid-July and September.Performance-Based Booster:
An additional 10% of shares unlocks if the stock trades 30% or more above the IPO price during 5 of 10 consecutive trading days after the first earnings release. This effectively acts as a stock-price early release trigger, set at 130% of the IPO price.Time-Based Tranches:
7% of shares unlock at each of five rolling post-IPO dates: Day 70, Day 90, Day 105, Day 120, and Day 135.Q3 Earnings Unlock:
Another 28% of shares become sellable upon the release of the Q3 earnings call, usually taking place between mid-October and December.180-Day Full Expiry:
All remaining restricted shares held by regular shareholders become fully eligible for sale by Day 180. The early-release triggers can bring supply forward, but the total amount released by Day 180 is the same either way.
Market Implications
Days 180 and 366 are the two most important unlock points because they release the majority of restricted shares. However, SpaceX’s lock-up schedule is unusually aggressive compared with most IPOs.
In a typical IPO, insiders are restricted by a single 180-day lock-up cliff, sometimes with limited exceptions tied to earnings releases or modest stock-price-based partial unlocks. SpaceX’s structure is much more flexible and front-loaded. Regular shareholders can begin selling within a couple of months of listing, and supply is continuously drip-fed into the market throughout the lock-up period.
This creates a more complex trading setup. On one hand, repeated unlocks may pressure the stock by increasing available supply and raising the risk of large shareholder sell-downs. On the other hand, the gradual expansion of the free float could improve liquidity and eventually lead to higher index inclusion weightings, which may attract incremental passive fund demand.
Source: Intropic, Yahoo Finance