Key Takeaways
- Restricts insiders from selling shares post-IPO.
- Typically lasts 90 to 365 days.
- Prevents stock price instability after offering.
What is Lock-Up Agreement?
A lock-up agreement is a contractual arrangement that restricts company insiders from selling their shares for a defined period, commonly during an initial public offering (IPO). This agreement helps stabilize the stock price by preventing sudden influxes of shares into the market.
Typically, lock-up agreements involve company executives, venture capitalists, and other significant shareholders who might otherwise sell large blocks of stock immediately after the IPO.
Key Characteristics
Lock-up agreements have distinct features that affect shareholders and market dynamics:
- Duration: Usually lasts between 90 days and one year, with 180 days being common; SPACs often impose a 365-day lock-up.
- Participants: Includes C-suite executives, venture capitalists, and other substantial shareholders.
- Purpose: Prevents excessive selling pressure post-IPO to maintain orderly trading and price stability.
- Termination Conditions: Can end early if the underwriting agreement is canceled or certain price thresholds are met.
- Scope: Applies mainly to IPOs but can also be used in acquisitions or hostile takeover defense.
How It Works
When a company goes public, underwriters negotiate lock-up agreements with insiders to restrict share sales for a set period. This prevents immediate sell-offs that could depress the stock price and hurt investor confidence.
During the lock-up period, shareholders are legally barred from selling shares, aligning insider interests with long-term company performance. After expiration, insiders may sell shares, which sometimes leads to increased market volatility. Investors tracking ETFs like SPY or IVV often monitor lock-up expirations as potential volatility indicators.
Examples and Use Cases
Lock-up agreements are commonly seen in various corporate scenarios:
- Airlines: Companies like Delta and American Airlines often use lock-up agreements during their IPOs to ensure stock price stability.
- SPACs: Special purpose acquisition companies frequently apply 365-day lock-ups to prevent early selling after mergers.
- Corporate Governance: Lock-ups help align the interests of the C-suite and investors by discouraging opportunistic short-term selling.
Important Considerations
Understanding lock-up agreements is key before investing in newly public companies. The end of a lock-up period can introduce selling pressure and price fluctuations, so monitoring these timelines is crucial for timing trades.
Additionally, lock-ups can differ widely in length and scope depending on the company and underwriter terms, so reviewing the specific agreement details can help you assess potential risks. For investors interested in equity financing concepts like paid-in capital or shareholder protections such as tag-along rights, lock-ups are an important complementary mechanism to understand.
Final Words
Lock-up agreements play a crucial role in stabilizing stock prices post-IPO by restricting insider sales for a set period, typically six months. If you're considering investing in a newly public company, monitor when the lock-up expires, as this can significantly impact share price volatility.
Frequently Asked Questions
A lock-up agreement is a legally binding contract between company insiders and underwriters that restricts the sale of shares for a set period, usually during an IPO. It helps maintain stock price stability by preventing immediate selling pressure after the offering.
Lock-up agreements prevent insiders from selling shares right after an IPO, which helps avoid excessive selling pressure. This allows the market to properly evaluate the stock’s value and supports orderly trading in the initial months.
Lock-up periods typically last around 180 days, or six months, but can range from 90 days up to one year. The exact duration is usually set by the underwriter and can vary depending on the type of insider.
Lock-up agreements commonly apply to company insiders such as venture capitalists, directors, officers, executives, employees, and sometimes their family members or friends. Substantial shareholders and control persons are also often included.
Yes, lock-up agreements can also be used in other corporate transactions like acquisitions or hostile takeovers to prevent insiders from selling shares too quickly and destabilizing the stock price.
In rare cases, lock-up periods may be shortened to accommodate factors like quarterly earnings blackout periods or if the stock price reaches a certain threshold. They also end if the underwriting agreement is terminated or the IPO is canceled.
Yes, different classes of insiders may have varying lock-up periods. For example, directors and substantial shareholders often have longer restrictions, while employees and option holders might have shorter lock-up durations.


