Mark Zuckerber is no longer a member of the technology billionaires club. As Facebook's stock continues to plummet, Zuckerberg's wealth is declining as well.

Mark's fortune dropped by $423 million yesterday as shares of the world's largest social media company fell 4 percent to $20.04 in new York, a record low. Zuckerberg is now only worth $10.2 billion. He is about $400 million behind James Goodnight, the co-founder of Cary, North Carolina-based software manufacturer SAS institute Inc, who now ranks as technology's 10^th richest person, according to the Bloomberg Billionaires Index.

According to The Menlo Park, the California-based company last week reported  that Facebook Shares have fallen 47 percent from their initial public offering price of $38.

Mark Zuckerberg's fortune is based on his owner ship of 503.6 million shares on Facebook, and about $150 million in cash and other liquid assets.

According to data put together by Bloomberg, SAS is worth 15.8 billion.

Microsoft Corp. (MSFT) co-founder Bill Gates is the richest technology billionaire in the world with a net worth of $61.6 billion, according to Bloomberg's index.