Valuing initial public offerings (IPOs) using multiples allows underwriters discretion when selecting comparable firms. We find that they systematically exclude candidate comparable firms that make a given IPO appear overvalued. On average, comparable firms published in official prospectuses have 13%-38% higher valuation multiples than those obtained from matching algorithms or selected by sell-side analysts, including the same underwriter's analyst after the IPO. Even if IPOs are priced at a discount as compared to peers selected by the underwriters, they are still at a premium with regard to alternatively selected peers. Greater bias in the underwriter's selection of peers leads to poorer long run performance. Ritter and Welch (2002, p. 1816) note that "the most common method for valuing firms going public is the use of comparable firm multiples." Nevertheless, very little is known about how underwriters implement this approach, and how they select comparable firms. In the absence of explicit directives from the Securities and Exchange Commission, there is no publicly available information as to how an initial public offering (IPO) firm is valued in the United States. In contrast, the European Securities and Markets Authority (ESMA) recommends disclosure of the valuation methods used to determine the offer price, although disclosure policies vary by country (ESMA/2012/468). 1 We take advantage of the availability of information in Europe to determine how underwriters select the peers used to value the companies they take public. We compare peers selected by the underwriter at the time of the IPO with those selected by sell-side analysts (including the same underwriter providing aftermarket analyst coverage) or by alternative * Stefano Paleari is a Professor in the