Small Business Stock -No corporate investors can exclude up to 50 percent of the GAIN they realize on disposition of qualified small business stock issued after Aug. 10, 1993 and held for more than 5 years. Amount of gain eligible for the 50% exclusion is subject to per-issuer limits. In order to qualify for EXCLUSION, CORPORATION issuing the stock should be a C Corporation (though excluding certain investment corporations) and it should use at least 80 percent of its assets in active conduct of one or more qualified trade or businesses. Additionally, its gross assets can't exceed $50 million.