What was the offering price and number of shares offered at Interactive Brokers Group, Inc.'s initial public offering?

The initial public offering of IBKR shares was determined by a Dutch auction which resulted in an offering price of $30.01 per share for 40 million shares.

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How do I participate in an IPO?
What is an Initial Public Offering (IPO)?
What type of IPOs does Interactive Brokers offer?
Can I apply for shares through both the Public Offer and Placement Offer Tranches?