Ivy DB OptionMetrics US is a comprehensive source of high-quality historical price and implied volatility data for the US equity and index options markets. It encompasses data on all US exchange-listed and NASDAQ equities and market indices, as well as all US listed index and equity options, as of January 1996. The Wharton Research Data Service (WRDS) is the tool that provides web-based access to this database and its user guides. WRDS accounts are available to current JHU faculty and graduate students, for their academic research. Faculty also may request a shared “class” account for undergraduate or graduate courses.