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Lock-Up Period


The lock-up period in finance refers to a predetermined amount of time following an Initial Public Offering (IPO) in which large shareholders, such as company executives or investors, are forbidden from selling their shares. This period, typically lasting 90 to 180 days, aims to prevent the market from being flooded with a large amount of a single company’s stock. In other words, it stabilizes the stock price post-IPO.


The phonetics of “Lock-Up Period” is: lɒk-ʌp ‘pɪəriːəd

Key Takeaways

Main Takeaways About Lock-Up Period

  1. Definition: The lock-up period is a predetermined amount of time following an initial public offering where large shareholders, such as company executives and investors representing considerable ownership, are restricted from selling their shares.
  2. Purpose: The lock-up period is implemented to prevent the market from being flooded with a large number of shares, which could potentially devalue the stock. Its primary purpose is to ensure stock price stability and to facilitate an orderly market post-IPO.
  3. Duration: Typically, the lock-up period lasts from 90 to 180 days, but the exact timeline can vary based on the agreement between the company going public and the underwriting investment bank. After the lock-up period ends, large shareholders are free to sell their shares, which can sometimes lead to increased market volatility.


The lock-up period is a critical term in the context of business and finance since it refers to a predetermined period of time following an initial public offering (IPO), during which major shareholders, such as company founders, executives, and employees, are prohibited from selling their shares. This restriction is important as it helps maintain the share price stability post-IPO by preventing an immediate flood of shares onto the market, which could potentially collapse the stock price. Moreover, it provides new investors an assessment period to judge the company’s worth based on its actual performance rather than insider selling. Therefore, the lock-up period plays a significant role in safeguarding early investor confidence and the company’s market value.


The lock-up period serves a significant purpose in the context of Initial Public Offerings (IPOs) and builds trust between investors, the public market, and companies looking to go public. Essentially, it’s a predetermined period of time following an IPO when insiders and major stakeholders of the company – they could be executives or private equity investors – are prohibited from selling their shares. In these instances, the lock-up period’s primary purpose is to prevent the market from being flooded with a large number of shares, a situation that could result in an extreme dip in share price due to an excess supply.Lock-up periods are also utilized in venture capital deals and private equity transactions. For instance, a venture capitalist investing in a start-up might agree to a lock-up period, ensuring that they won’t sell their shares for a specific period post-investment. It serves as a demonstration of their commitment and confidence in the potential growth of the business. In this scenario, the lock-up period aims to ensure stability and prevent rapid selling that could potentially disrupt the normal functioning and growth of the company. Overall, a lock-up period is a significant mechanism used to provide some degree of certainty and stability in financial transactions and the public stock market.


1. Alibaba’s IPO: When Alibaba Group went public in September 2014, there was a lock-up period of 180 days. This meant that insiders, early investors, and employees who had shares in the company prior to it going public were not allowed to sell their shares for six months after the initial public offering. This helped to prevent a sudden, massive sell-off and protect the stock price in the early stages of being a public company.2. Facebook’s IPO: In the case of Facebook’s initial public offering in 2012, the lock-up period was staggered. A certain percentage of shares were released 90 days after the IPO, with more released at 180 days, and even more at 365 days. This tiered approach helped to ensure a controlled release of shares onto the market.3. Venture Capital Investments: For venture capital firms investing in startups, lock-up periods are very common. For instance, a venture capital firm might invest in a startup and be subject to a 5-year lock-up period where they cannot sell their investment. This ensures that they will remain invested in the company for a significant period, allowing the startup to use the funds to grow the business. After the lock-up period has ended, the venture capital firm can then sell its stake.

Frequently Asked Questions(FAQ)

What is a Lock-Up Period?

A Lock-Up Period is a predetermined period post-initial public offering (IPO), where major shareholders are prohibited from selling their shares. This period generally ranges from 90 to 180 days.

Why does a Lock-Up Period exist?

The Lock-Up Period exists to prevent the market from being flooded with a large number of shares, which could depress the stock price. It also allows the market to gauge the company’s value based on its performance, rather than the actions of insiders or large investors.

Who is typically subject to a Lock-Up Period?

Major stakeholders like company executives, employees, early investors, and venture capitalists are usually subject to a Lock-Up Period.

What happens when a Lock-Up Period ends?

Once the Lock-Up Period ends, the restricted shareholders are allowed to sell their shares. This could possibly lead to increased market volatility, as a large quantity of shares might enter the market at once.

How does a Lock-Up Period affect an investor?

While the Lock-Up Period is in effect, an investor holding these shares cannot sell them, which may be a disadvantage if the stock price is high. However, after the period expires, they have full freedom to sell or hold the shares based on their financial strategy and the stock’s performance.

Can a Lock-Up Period be extended?

Yes, the underwriting bank can extend the Lock-Up Period, typically if the company announces a significant event, like an acquisition or better-than-expected earnings results, which could substantially affect the stock price.

Is the Lock-Up Period legally required?

No, the Lock-Up Period is not a legal requirement; it’s a contractual agreement between the issuing company and the underwriting company. However, it’s a common practice in the market to protect against potential price manipulation.

Related Finance Terms

  • Initial Public Offering (IPO): An IPO refers to the process of offering shares of a private corporation to the public in a new stock issuance. Lock-up periods frequently follow an Initial Public Offering.
  • Securities and Exchange Commission (SEC): The SEC is a large government agency that regulates the securities industry and protects investors. It often enforces lock-up periods following an IPO.
  • Secondary Market: This is where investors buy and sell securities they already own. Typically, securities sold in the secondary market are subjected to a lock-up period.
  • Venture Capital: Venture capital firms are often the primary investors in startup companies. They are commonly subjected to lock-up periods following an IPO to prevent a drastic selloff that could negatively affect the share price.
  • Underwriter: An underwriter is any party that assesses and assumes another party’s risk for a fee. They usually help enforce the lock-up period after an IPO to protect the share price from early selling that could depress the price.

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