A sign welcoming Facebook on a screen outside the NASDAQ...

A sign welcoming Facebook on a screen outside the NASDAQ stock exchange in Manhattan. (May 18, 2012) Credit: AFP/Getty Images

Facebook's stock price fell Wednesday, the day employees were eligible to start selling restricted stock in the company.

A lockup period that had prevented such sales expired Monday. U.S. markets reopened Wednesday after superstorm Sandy.

In all, 234 million additional shares and stock options held by employees as of Oct. 15 became eligible to flood the market. CEO Mark Zuckerberg has said he won't be selling stock until at least next September.

Lockups, common after initial public offerings, are designed to prevent a stock from experiencing the kind of volatility that might occur if too many shareholders decide to sell at once.

Facebook's stock hasn't done well since its IPO in May amid concerns about its ability to keep growing revenue. But it saw its biggest one-day gain last Wednesday after posting strong third-quarter results and detailing for the first time how much money it makes from mobile ads. Mobile ads had been a concern since before the Menlo Park., Calif., company's IPO.

The next lockup expires Nov. 14; 777 million shares and stock options will become eligible to be sold.

Gregg Sarra sounds off on the Northport and Half Hollow Hills East matchup, plus Tess Ferguson has an update on the high school fantasy football standings and Jared Vailuzzi has the plays of the week. Credit: Newsday

Sarra Sounds Off, Season 3, Ep 3: Top football teams in action, fantasy update and plays of the week Gregg Sarra sounds off on the Northport and Half Hollow Hills East matchup, plus Tess Ferguson has an update on the high school fantasy football standings and Jared Vailuzzi has the plays of the week.

Gregg Sarra sounds off on the Northport and Half Hollow Hills East matchup, plus Tess Ferguson has an update on the high school fantasy football standings and Jared Vailuzzi has the plays of the week. Credit: Newsday

Sarra Sounds Off, Season 3, Ep 3: Top football teams in action, fantasy update and plays of the week Gregg Sarra sounds off on the Northport and Half Hollow Hills East matchup, plus Tess Ferguson has an update on the high school fantasy football standings and Jared Vailuzzi has the plays of the week.

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