Research · Living data · Updated 2026-07-17
When insider and pre-IPO shares unlock and become sellable — a living calendar derived straight from prospectuses.
A lockup expiration is one of the most watched supply catalysts after an IPO: on a scheduled date, insiders and pre-IPO investors are free to sell shares that were previously restricted. NextTrack tracks 3,901 lockup and unlock events, each derived straight from the IPO prospectus. The count refreshes on every rebuild, so this is a living calendar rather than a static list.
| Metric | Live figure |
|---|---|
| NextTrack tracks | 3,901 lockup events |
| Last updated | 2026-07-17 |
When a company IPOs, insiders — founders, employees, and pre-IPO investors — typically agree not to sell for a set period, commonly 90 to 180 days. When that period ends, the restricted supply becomes sellable. The event is watched because it can add meaningful new float to a thin post-IPO market, and the market often positions for it in advance.
The naive read is 'lockup expires, stock drops.' Reality is subtler. What matters is the **size of the unlock relative to existing float**, and whether the prospectus specifies staged or early-release provisions that spread the supply out. A large unlock into a small float is a real supply event; a small unlock into a deep, liquid float is often a non-event that the market has already priced.
Because NextTrack derives the dates from the prospectus rather than a third-party estimate, staged releases and early-release triggers are captured where the filing specifies them.
Lockup periods are extracted from IPO prospectuses (S-1 / 424B4) and mapped to a calendar of expiry dates. Each event links back to the IPO it belongs to — see the [2026 IPO tracker](/research/ipo-tracker-2026) for the offer terms and post-IPO returns of the underlying companies. The full calendar, sortable by date and by shares unlocking, is in the app.