Tidjane Thiam an executive director, sitting on the plc board. In January 2007, after Richard Harvey announced he would step down as chief executive of Aviva, Thiam was tipped as a possible future head of the group. Thiam left Aviva in September 2007 to become chief financial officer of Prudential plc. In March 2009, Thiam was named chief executive, effective from October, after Mark Tucker chose to step down. The appointment made him the first African to lead a FTSE 100 listed company. His departure from the role was announced on 10 March 2015. After he became chief executive, Prudential launched a
FTSE 250 Index FTSE 250 Index The FTSE 250 Index ( ) is a capitalisation-weighted index consisting of the 101st to the 350th largest companies listed on the London Stock Exchange. Promotions and demotions to and from the index occur quarterly in March, June, September, and December. The Index is calculated in real-time and published every minute. Related indices are the FTSE 100 Index (which lists the largest 100 companies), the FTSE 350 Index (which combines the FTSE 100 and 250), the FTSE SmallCap Index and the FTSE All-Share Index (an aggregation of the FTSE 100 Index, the FTSE 250 Index and the