This document provides an overview of investment market performance and activity for the week. Major stock market indices such as the Dow Jones, S&P 500, and Nasdaq declined between 5-7% while some international indices like the FTSE 100 and Nikkei 225 fell 4-5%. Saudi Arabia's Tadawul index dropped over 7%. The document lists the most actively traded companies by shares and value on each index as well as the top gainers and decliners.