Shares being sold at $28 to $35; total would dwarf $1.9 bln Google raised in 2004.

Deal brings in less than private equity firm sought.

Deal brings in less than private equity firm sought.

PE firm will sell stake of about 10% in offering targeted for early May.

PE firm will sell stake of about 10% in offering targeted for early May.

Company already has more than 1,000 shareholders, valuation over $100 billion.

Company already has more than 1,000 shareholders, valuation over $100 billion.