ABOUT ADA PRODUCTSADES INVESTORS NEWS CONTACT Previous TRUSTED EXPERTS Answers, equipment and data you can trust. COMMITTED TO CUSTOMERS Forward thinking solutions to advance cleaner energy Next SUBSCRIBE TO OUR EMAIL ALERTS News SEC Events Disclaimer and Privacy Site Map © 2021 Advanced Emissions Solutions, Inc. All Rights Reserved. Powered By Q4 Inc. 5.56.0.1 (opens in new window)

ABOUT ADA PRODUCTSADES INVESTORS NEWS CONTACT Home|Contact CONTACT US Corporate Headquarters 8051 E. Maplewood Ave, Suite 210 Greenwood Village, CO 80111 Phone: (888) 822-8617 or (720) 598-3500 Email: contactus@adaes.com Sales, Technical Requests & Customer Care Email: customercare@adaes.com Phone: 888-843-8416 Investor Relations & Media Alpha IR Group Ryan Coleman or Chris Hodges One South Wacker Drive, Suite 2110 Chicago, IL 60606 Phone: (312) 445-2870 Email: ADES@alpha-ir.com Board of Directors Email: greg.marken@adaes.com Transfer Agent By Regular Mail: P.O. BOX 30170 College Station, TX 77842 UNITED STATES By Overnight Delivery: 211 Quality Circle Suite 210 College Station, TX 77845 UNITED STATES Telephone: Toll Free: 800 962 4284 Toll: +1 (781) 575 3120 ADA Products & Services Investor Resources Financials Leadership & Governance SUBSCRIBE TO OUR EMAIL ALERTS News SEC Events Disclaimer and Privacy Site Map © 2021 Advanced Emissions Solutions, Inc. All Rights Reserved. Powered By Q4 Inc. 5.56.0.1 (opens in new window)