Sheryl Sandberg has made $44.3M from Facebook stock this year

The Facebook executive punctuates the value of leaning in by selling a small portion of her stake in the social network.

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Sheryl Sandberg is demonstrating just how lucrative leaning in can be.

The Facebook chief operating officer, whose new book "Lean In" aims to inspire women to work to the top of their industries, has made roughly $44.3 million in the first three months of 2013 from a number of Facebook stock sales, including a few transactions earlier this week, as documented in filings with the Securities and Exchange Commission.

Since the start of the year, Sandberg has sold roughly 1.57 million shares for the $44.3 million gain. In her most recent trades this week, Sandberg sold 176,452 shares at prices ranging from $25.80 to $26.67. The transactions are valued at about $4.6 million.

The 2013 running total doesn't include a massive December 2012 sale in which Sandberg offloaded 946,588 shares for a value of $26.2 million.

While Sandberg appears to have adopted a fast and furious selling strategy for 2013, the Facebook executive isn't exactly dumping her stake in the social network to get rich quick. Sandberg still holds about 17.79 million vested shares in Facebook, according to the most recent filing.

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