A window of time when insiders are prohibited from selling their shares, usually after an IPO.
Definition
A lock-up period is a legally binding contract that prevents company insiders (founders, employees, and early VC investors) from selling their shares for a specific duration after a company goes public. These periods typically last 90 to 180 days.
Why it matters for Whale Tracking
The expiration of a lock-up period is a massive event for whale trackers. It often results in a surge of Form 4 'dispositions' (sales) as early investors finally seek liquidity. If insiders *don't* sell after a lock-up expires, it is an extremely bullish signal of long-term confidence.
Technical Nuance
The expiration of a lock-up period can lead to significant market volatility as insiders may sell their shares to realize gains or diversify their portfolios. However, if insiders choose not to sell, it can be interpreted as a sign of long-term commitment and confidence in the company's future prospects.
Track Lock-up Periods Live
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Real-World Example
"Following the IPO of a tech unicorn, the 180-day lock-up expires. While most employees sell to diversify, the CEO keeps 100% of their shares. This lack of selling volume is a high-conviction signal that the CEO expects further growth."
Fundamental Quant Thesis
Go beyond the raw data. Read institutional-grade analysis on why liquidity-event insiders are moving capital and the long-term structural impact.