Interpublic Group stock got a boost earlier this month on chatter of a potential takeover. While the broader stock market has leapt from record to record over the past year, Interpublic Group’s stock has stalled, losing 6.5% over the past 12 months. Organic revenue growth is a key metric in the industry, as it suggests that an agency is expanding, winning new business, and setting itself up for sustainable sales going forward.