Lock-Up Period¶
OVERVIEW¶
A lock-up period is a contractual restriction preventing company insiders — founders, executives, employees, and pre-IPO investors — from selling shares for a fixed window after a stock begins public trading. Lock-up periods are negotiated between the company and its IPO underwriters and disclosed in the IPO prospectus.
Note
Lock-up expiration dates are public and scheduled well in advance, making them a trackable supply event on Tapeboard's IPO calendar.
Purpose: Prevents insider selling from overwhelming public demand immediately after listing, giving the stock time to establish a trading history and stable float before additional supply enters the market.
STANDARD STRUCTURE¶
| Parameter | Typical Range | Notes |
|---|---|---|
| Standard length | 180 days | Measured from the IPO effective date |
| Short end | 90 days | Less common; often employee tranches |
| Long end | 365 days | Often applied to founders and pre-IPO investors |
| Tiered release | Varies | Multiple classes unlock on different dates |
| Early-release clause | Discretionary | Underwriters may waive if stock sustains a price above IPO level |
Tip
Check the Form S-1 or 424B filing for the exact expiration date and structure. Confirmations are typically published via an 8-K or press release close to the expiration date.
WORKED EXAMPLES¶
Meta (Facebook) — 2012
| Event | Detail |
|---|---|
| IPO date | May 18, 2012 |
| Lock-up expiry | November 14, 2012 |
| Shares unlocked | ~777 million (more than double the existing float) |
| Expiry-day price move | −4.5% |
| Outcome | Recovered over subsequent months as mobile-ad revenue absorbed supply |
Snap Inc. — 2017
| Holder Class | Lock-Up Length | Expiry Impact |
|---|---|---|
| Employees | 150 days | ~−5% on expiry date |
| Company insiders | 365 days | Longer runway before supply hit |
HOW TO USE¶
Lock-up expiration data on Tapeboard is most useful for the following workflows:
Pre-expiration positioning
- Avoid initiating new long entries in the days leading into expiration
- Monitor implied volatility in options — elevated IV ahead of the date signals market anticipation of a supply-driven move
Directional trades
- Aggressive traders may position short or buy puts in anticipation of supply-driven price pressure
- Size positions relative to the ratio of unlocked shares to existing float
Context checks on post-IPO price action
- A rally into a lock-up expiration carries elevated downside risk
- Compare the same rally pattern with no expiration on the near-term calendar to assess relative risk
Note
Tapeboard's IPO calendar flags lock-up expiration dates alongside float size and unlocked share count so you can assess supply impact without manual S-1 lookups.
LIMITATIONS AND MISCONCEPTIONS¶
| Misconception | Reality |
|---|---|
| Lock-up expiry always causes a decline | ~60% of stocks decline around expiry; a meaningful minority do not |
| The full unlocked share count hits on expiry day | Realized selling is often a fraction — insiders hold for tax planning, conviction, or blackout constraints |
| Expiry-day price action captures the full move | Sophisticated participants price in expected impact in advance; much of the move may already be reflected |
| Early-release clauses are automatic | Early release is discretionary and underwriter-controlled, not triggered by price alone |
Tip
Treat lock-up expiration as a probabilistic tailwind for downside, not a guaranteed catalyst. Strong fundamentals or a broad sector rally can offset the added supply entirely.