Chapter 5. Investment Banking and Securities Issuance This chapter analyzes the securities issuance process focusing on initial public offerings (IPOs) and seasoned equity offerings (SEOs). The IPO literature documents three empirical patterns: 1) short run underpricing; 2) long run underperformance (although this is contentious); and 3) extreme time series fluctuations in volume and underpricing. While the chapter mainly focuses on evidence from the USA evidence from other countries is generally consistent with the USA patterns. A large literature explaining the short run underpricing of IPOs exists with asymmetric information models predominating. The SEO literature documents 1) negative announcement effects; 2) the setting of offer prices at a discount from the market price; 3) long run underperformance; and 4) large fluctuations in volume. In addition to long run underperformance relative to other stocks there is some evidence that issuers succeed at timing their equity offerings for periods when future market returns are low. When examining a large class of corporate financing activities including equity offerings convertible bond offerings bond offerings open market repurchases stock and cash financed mergers and acquisitions and dividend increases or decreases several patterns emerge. In general the announcement effects are negative for activities that provide cash to the firm and positive for activities that pay cash out of the firm. Furthermore the market generally underreacts in that long run abnormal returns are usually of the same sign as the announcement effect. In spite of the large expenditure of resources on analyst coverage there is little academic work emphasizing the importance of the marketing of financial securities. Only recently have papers begun to focus on the corporate financing implications if firms face variations in the cost of external financing due to the mispricing of securities by the market.