Healthcare Costs for Large Companies Rose Slowly in 2015 Healthcare costs for large companies rose 3.2% in 2015, research by Aon Hewitt has found.  It is the smallest increase since 1996, when Aon began tracking the data.  However, the company predicts a 4.1% increase in 2016.  David McCann discusses the findings. To find out more on this CFO article, click: Hike in Healthcare Costs Sinks to 20-Year Low.