Hello there, I'm an expert in the field of technology and finance, with a keen interest in the dynamics of the stock market and the major players within it. When it comes to the ownership of shares by key figures such as Mark Zuckerberg, the CEO of Facebook, there are several factors to consider.

Firstly, it's important to understand the structure of a company like Facebook, which is a publicly traded entity. The ownership of shares can fluctuate due to various reasons such as stock buybacks, issuance of new shares, and personal sales or purchases by the shareholders, including the CEO.

Mark Zuckerberg, as the co-founder and CEO of Facebook, has historically held a significant portion of the company's shares. According to the information provided, Zuckerberg owns 28.2% of Facebook's B shares. This is a substantial stake, which gives him considerable influence over the company's direction and decisions.

Now, let's delve into the valuation aspect. The valuation of a company is a complex process that involves various financial metrics and market conditions. The $85 billion valuation mentioned is a snapshot and can change based on the company's financial performance, market sentiment, and other external factors. At this valuation, if Zuckerberg's stake is 28.2%, then the worth of his shares can be calculated as follows:

\[ \text{Value of Zuckerberg's stake} = \text{Valuation} \times \text{Percentage of shares owned} \]
\[ \text{Value of Zuckerberg's stake} = \$85 \text{ billion} \times 28.2\% \]
\[ \text{Value of Zuckerberg's stake} = \$23.97 \text{ billion} \]

This calculation gives us an estimate of the worth of Zuckerberg's shares at the given valuation. However, it's crucial to note that the actual value can be different based on the most current market conditions and the company's valuation at the time of inquiry.

It's also worth mentioning that Zuckerberg has been proactive in defending Facebook's intellectual property and has shown no interest in selling his stake to other companies, such as Viacom or Yahoo!, which have reportedly made buyout offers. This demonstrates his commitment to the company and his vision for its future.

In conclusion, the number of shares owned by Mark Zuckerberg and their value are subject to change over time. However, based on the provided information and a valuation of $85 billion, his stake in Facebook is substantial, both in terms of the percentage of shares and the monetary value. His actions to date suggest a long-term commitment to the company's success and growth.

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Zuckerberg has since defended the site in intellectual property disputes and spurned buyout offers from Viacom, Yahoo! and other suitors. The 27 year old CEO owns 28.2% of Facebook's B shares. Using an $85 billion valuation, Zuck's stake is worth just shy of $24 billion.read more >>