In this study, a sample of 357 firms that issued initial public offerings (IPOs) between October 2005 and July 2014 is examined to determine the factors influencing the likelihood of underwriter price support, the likelihood of price stabilization, and the first-day returns. The results are summarized as follows: (a) the lot-winning rate, firm age, and market category influence the first-day returns (b) the lot-winning rate and cumulative return rate on the first 5 days influence the likelihood of underwriter price stabilization; (c) the overallotment ratio and cumulative return rate on the first 5 days influence whether the underwriter executes price support and stabilization measures.