A marketing tool created and used by an investment firm.  A firm will create this book filled with information about the firm, and then use this as a tool when attracting new clients for the firm.  These books will often include general information about the company, broad financial information describing their achievements, and specific stories about special events or situations the firm has encountered.
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- Pitchbook Definition | Investopedia
 A sales book created by an investment bank/firm that details the main attributes of   the firm. The pitchbook is used by the firm's sales force to aid it with selling ...
 
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