Two Mass. firms expected to go public
Burlington software maker Exa Corp. and Waltham biotech firm Tesaro Inc. are expected to debut on Wall Street next week. The 21-year-old Exa Corp., which makes software to improve vehicle aerodynamics, will price shares between $11 and $13, according to its Securities and Exchange Commission filing. Its IPO on the Nasdaq exchange could raise $75 million. Tesaro is also expected to open on the Nasdaq to raise $81 million. The drug maker will price shares between $12 to $15.