1、CLEAN HARBORS,INC.|ANNUAL REPORT 2021Dear Shareholders:2021 was a banner year for Clean Harbors.We delivered substantial growth in profitability with many of our core lines of business returning to pre-pandemic levels.By adhering to a demand-driven market strategy,we advanced our reputation as the l
2、eading supplier of environmental services in North America.We also fortified our position as top U.S.provider of industrial services with the$1.2 billion acquisition of HydroChemPSC(HPC)in October.Our results continue a multi-year growth trend across all of our key financial metrics.Revenue increase
3、d by 21%to a record$3.8 billion,aided by the acquisition of HPC.At the same time,Adjusted EBITDA rose by 18%to$677 million,which supported a 23%rise in adjusted free cash flow to a record$326.3 million.Overall,it was another year of delivering exceptional performance for our stakeholders,as our ROIC
4、 increased for the fourth consecutive year.Stronger Together the Addition of HPC Even prior to our acquisition,HPC was the established U.S.leader in industrial services with proprietary technology,an experienced team,considerable assets and 240 service locations.With approximately$800 million in ann
5、ual revenue,HPC provides solutions focused on cleaning,maintenance and environmental compliance of essential,mission critical equipment and infrastructure.The transaction added 5,000 talented employees to the Clean Harbors team.HPC affords us a number of strategic benefits beyond just expanding the
6、size and scale of our operations.Unrivaled automation and hands-free technology capabilities have earned HPC recognition as the top industrial services company in safety.Its operating principles highlighted by its commitment to safety,innovation and compliance mirror ours.This commitment is one of t