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Strategic IPO underpricing, information momentum, and lockup ...

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number of recommendations made specifically about each company by the <strong>IPO</strong> lead<br />

underwriter’s analyst <strong>and</strong> by other non-lead underwriter analysts. We collect these data from the<br />

time of the <strong>IPO</strong> through one month following the expiration of the <strong>lockup</strong> provision.<br />

The model predicts that <strong>information</strong> <strong>momentum</strong> increases returns between the <strong>IPO</strong> <strong>and</strong> the<br />

expiration of the <strong>lockup</strong> period. We use data from the Center for Research in Security Prices<br />

(CRSP) to examine returns between the <strong>IPO</strong> <strong>and</strong> the <strong>lockup</strong> expiration. The model also predicts<br />

that <strong>information</strong> <strong>momentum</strong> increases insider selling at the expiration of the <strong>lockup</strong> period. We<br />

use insider-trading data from the Dialog Insider Trading Monitor. This database has the<br />

transactions details of all insider filings received by the U.S. Securities <strong>and</strong> Exchange<br />

Commission (SEC) beginning in January 1984. The data contain all securities transactions by<br />

officers, directors, management <strong>and</strong> major shareholders. We include the following positions in<br />

our definition of insiders: Chairman of the Board, President, Chief Executive Officer, Chief<br />

Financial Officer, Chief Operating Officer, Vice President, General Partner, Officer, Director,<br />

Chief Accounting Officer, <strong>and</strong> Controlling Person. The transactions are dated <strong>and</strong> coded by the<br />

type of transaction. They also contain the name <strong>and</strong> position of the insider, the number of shares,<br />

<strong>and</strong> the transaction price.<br />

Finally, we include several control variables in various parts of our empirical analysis. We<br />

include short interest outst<strong>and</strong>ing for the five months surrounding the expiration of the <strong>lockup</strong><br />

provision for each firm. For firms listed on Nasdaq, data on short interest are from Nasdaq. For<br />

firms listed on the NYSE, data on short interest are from Bloomberg. We also include a measure<br />

of the quality of the <strong>IPO</strong> based on the ranking of the lead underwriter. We assume that higher<br />

quality offerings are underwritten by higher quality investment banks, <strong>and</strong> that higher quality<br />

investment banks have greater market share in terms of <strong>IPO</strong> proceeds raised (see Megginson <strong>and</strong><br />

16

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