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Companies issuing stock during 1970 1990, whether an initial public offering (IPO) or a seasoned equity offering (SEO), have been poor long run investments for investors. During the five years after the issue, investors have received average returns of only 5% per year for companies going public and only 7% per year for companies conducting an SEO. Book to market effects account for only a modest portion of the low returns. An investor would have had to invest 44% more money in the issuers than in non issuers of the same size to have the same wealth five years after the offering date.
Loughran et al. (Wed,) studied this question.