Case Study: Steel Dynamics achieves 87% employee engagement and reduced healthcare costs with Castlight Health

Steel Dynamics gets 9 out of 10 employees engaged in managing their healthcare

Steel Dynamics, one of the largest U.S. steel producers with $8.8 billion in annual sales and over 7,700 employees across 100+ facilities, faced rising healthcare costs and low employee engagement in benefits—even after introducing a CDHP/HSA. Leadership needed to control spending, help employees become informed healthcare consumers, and increase participation in benefits programs.

By deploying Castlight’s personalized benefits platform and targeted communications (including a mobile app for frontline workers), Steel Dynamics drove exceptional adoption and engagement—87% of employees used the platform (about 9 in 10) with a 35% return rate within 90 days. The solution helped employees find lower‑cost care, enabled significant out-of-pocket savings, reduced call volume to the benefits team, and generated strong positive feedback from both staff and leadership.

Steel Dynamics

Mark Millett

President and CEO