Shares of cybersecurity company Tenable Holdings Inc. /zigman2/quotes/203199150/composite TENB -0.80% rallied in their first day of trading Thursday. Tenable shares surged nearly 32% to close at $30.25 on volume of more than 9.6 million shares, after the company priced 10.9 million shares at $23 a share late Wednesday. Tenable granted underwriters, which included Morgan Stanley, J.P. Morgan, Allen & Co. and Deutsche Bank, an additional 1.6 million shares to cover over-allotments. The Columbia, Maryland-based company, which filed for its offering as recently as June 29, offers cloud-based vulnerability management service meant to protect assets like network containers and web applications. Tenable follows in the footsteps of other hot cybersecurity stock debuts this year like Carbon Black Inc. and Zscaler Inc. /zigman2/quotes/203585803/composite ZS -1.51% amid booming demand for cybersecurity services from corporate IT departments.