Donald P. Rinaldi has never helped a company raise private equityfunding. He has never been part of an initial public offering. He doesnot have a license to buy and sell stock.

But the lack of experience hasn’t stopped the 63-year-old Boca Ratonresident from establishing an investment banking firm on thefree-for-all Internet, trying to reach companies that need capital andinvestors seeking to get in on the ground floor of emerging technologycompanies.