The Ireland Stock Exchange Overall Index (ISEQ) is a major stock market index which tracks the performance of all (excluding UK registered) companies listed on the Irish Stock Exchange. It is a capitalization-weighted index. The ISEQ has a base value of 1000 as of January 4, 1988.. This page provides - Ireland Stock Market (ISEQ) - actual values, historical data, forecast, chart, statistics, economic calendar and news. Ireland Stock Market (ISEQ) - actual data, historical chart and calendar of releases - was last updated on June of 2018.