This document contains the Member Company-submitted narratives for the Tier 1 PSE reported in 2021. It is a companion document to Report 2021p. IOGP has been gathering Tier 1 PSE narrative reports from its Members since 2013. These include Tier 1 PSE reported both by companies and contractors. Event reports are categorized by region, country, location (onshore/offshore), cause, activity at the time of the event, and point of release.