Advertising group S4 Capital issues second profit warning due to lower client volumes
S4's shares are down 62% year-to-dateFull year expectations revised lower againLike-for-like revenue growth from top 20 clients of 8.9%Shares in S4 Capital (SFOR) fell by nearly 25% to 72p as the advertising group once again warned on profit 'following slower than expected trading over the summer months' and 'current client activity levels.'The second profit warning since July came as the firm rep