The number of US domiciled initial public offerings (IPOs) has declined since its peak listing year in 1996. The US listing gap has grasped the attention of experts and researchers in the field but there is a lack of agreement among intellectuals regarding the underlying causes. The purpose of this paper is two-fold: 1) to identify and analyze the company characteristics and underlying factors that impact age at time of IPO that has resulted in the US listing gap and 2) to test if these characteristics and factors have fluctuated in impacting company age at IPO over time.