Lock-up
Also called: lockup period
ELI5
Owners agree not to sell shares for a while.
Used in conversation
“The IPO lock-up lasts 180 days.”
Definition
A restriction preventing security holders from selling for a defined period, often around an IPO.
Here “Lock-up” means: A restriction preventing security holders from selling for a defined period, often around an IPO.
Pitch context
You will see “Lock-up” in fundraising decks, data rooms, term sheets and investor conversations when the discussion reaches term-sheet control & investor rights.
Why it matters: In term-sheet control & investor rights, a loose definition can change rights, obligations, approval, disclosure or enforceability.
Caution
Meaning, enforceability and required process vary by jurisdiction and agreement; this definition is not legal advice.
Sources & evidence · 5
Direct term-level sources and supporting source families.
- National Venture Capital Association — Model Legal DocumentsDirect source · institutional · checked 2026-08-16
- Y Combinator — Series A Term Sheet TemplateDirect source · practitioner · checked 2026-08-16
- U.S. Securities and Exchange Commission — Small Business Capital Formation GlossarySupporting source family · primary · checked 2026-08-16
- U.S. Securities and Exchange Commission — Exempt OfferingsSupporting source family · primary · checked 2026-08-16
- Y Combinator — Safe financing documentsSupporting source family · practitioner · checked 2026-08-16