Depends on the market and price point, but 15% to 30% is pretty common -- assuming they are mostly product as opposed to services. (Services tends to narrow margins.) For the publicly-traded firms, you can get this info from their SEC filings.

Yes, you got me right, but I probably should not have made such a sweeping statement. Services firms' margins are really all over the map, and I've not really studied them for about 7 years. Much of the problem here is with size of company and accounting methods. E.g., lots of small (< 10pp) services companies pay founders/principals big salaries and big distributions (because they're S-corps or LLCs), and "official" profit margins thus suffer. They don't have shareholders other than themselves, so don't care about keeping anyone (other than the IRS) happy with annual reports. Big, public services companies (at least the healthy ones) report realistic and larger margins; IBM, for example, is (I think) around 24%. I was basing my knee-jerk response on the many surveys we did of SoftwareCEO readers some years back -- and that demographic is small (under $50 million) companies that might tell me their profit is only 5%, when, under more apples-to-apples accounting, profit might actually be 5 times that. Also, keep in mind that margins for product companies vary wildly by age/maturity. I.e., in early years a ton is invested in R&D and other startup costs, cramping margins; as they get traction and easy repeat customers, margins go way up. This is all to say, the word "typical" is a very dangerous concept. :-)