Since his company went public on May 18, the social network co-founder’s personal wealth on paper has dropped to $14.7 billion from $16.2 billion, Bloomberg reported after the company’s shares fell nearly 10 percent in Tuesday trading. The stock closed Tuesday at $28.84, and was trading slightly up Wednesday morning at $29.33.

According to a live blog of the speech from All Things Digital’s Ina Fried, Cook said he has “never been as amazed by all ‘the things I cannot talk about today.’ ”

The phone is notable for its 4.8-inch screen, as well as bells and whistles such as the 8-megapixel rear-facing camera, a 1.9-megapixel front-facing camera and the latest Android operating system, Ice Cream Sandwich.

The panel, announced Tuesday by the agency, will be chaired by Harvard University professor Jonathan Zittrain, co-founder of the Berkman Center for Internet and Society.

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Stocks ended the day up 3 percent to $32, where the price had hovered for much of Wednesday. The company had priced its initial public offering at $38 a share, and the price had been falling ever since.