Heritage-Crystal Clean (NASDAQ: HCCI) is a leading provider of parts cleaning, used oil re-refining, and hazardous and non-hazardous waste services. Primarily focused on serving small and mid-sized customers in the manufacturing and automotive services sectors, the company helps customers manage their used chemicals and liquid and solid wastes while simultaneously helping mitigate regulatory burdens. Headquartered in Elgin, Ill., Heritage-Crystal Clean, Inc. operates through 71 branches serving more than 65,000 customer locations. For more information, visit the company’s Web site at www.crystal-clean.com

William Blair & Company is a global investment banking and asset management firm committed to building enduring relationships with clients and providing expertise and solutions to meet their evolving needs. An independent and employee-owned firm, William Blair is based in Chicago, and has office locations in 10 cities, including London, New York, Shanghai, and Zurich. For more information on William Blair & Company, visit www.williamblair.com

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