Uber's post-IPO lockup expires Wednesday. Here's how Iockup expirations have impacted other companies this year.

• Uber's post-initial public offering lockup expires Wednesday, November 6. On that day, millions more shares will be available to trade.
• It could lead to a sharp selloff of Uber stock, according to Wedbush analyst Daniel Ives.
• But not all lockup expirations lead to falling stock prices. Here's how six recent IPOs performed after their lockup expirations.
• Read more on Business Insider.

On Wednesday, November 6, Uber's post-initial public offering lockup expires, meaning that new shares held by early investors will become eligible to trade on the market.

That means that an estimated 763 million additional shares, or $20 billion of Uber stock, will hit the market, according to Daniel Ives, an analyst at Wedbush.

The lockup expiration could "cause an avalanche of selling as early investors and insiders hit the bid, which remains a major Street worry around near-term pressure," wrote Ives in a note Friday.

That's what happened when Beyond Meat's lockup expired on October 29 and 48 million shares became eligible to trade. Shares fell 18.8% as early investors looked to realize some of the IPO's 322% pre-expiry gains. In addition, a slew of analysts downgraded price targets on the company, fueling the selloff.

But not all lockup expirations come with a major selloff. When Lyft's post-IPO lockup expired August 19, shares gained during the day and closed down 1.5%, which surprised analysts, according to CNBC.

And, some stocks gain through their lockup expirations. One example is Levi Strauss, which closed up 1.95% when its lockup period expired on September 17.

Here's how six recent IPOs performed after their lockup expirations: