Investor Resources


Our company trades on the NASDAQ Global Market under the ticker symbol "ARQ".
As of 1st February we have approximately 33 million shares of common stock outstanding. The number of shares outstanding at any point in time fluctuates slightly as a result of the exercise of stock options or upon the forfeiture of restricted stock awards. However, the number of outstanding options and unvested restricted stock awards is not material to the overall number of shares outstanding. A more precise number of shares outstanding can be obtained by reviewing our most current annual or quarterly SEC filing. Please see more information on the terms of the preferred stock in our SEC filings.
Arq, formerly known as Advanced Emissions Solutions (ADES), was founded in 1996 with a focus on emissions control and solutions and began trading on the Nasdaq under the ticker symbol “ADES” in 2011. Over its nearly three decades, the company has expanded and evolved its portfolio of emissions-focused products and services. In February 2023, ADES completed a transformational acquisition of Arq. The Company was rebranded to Arq in February 2024 and adopted the new Nasdaq ticker symbol “ARQ”, with the new name representing its broader focus as an environmental technology company.
The acquisition of Arq in February 2023 transformed the Company into a leading North American environmental technology firm. Integrating Arq's unique bituminous coal waste feedstock with proven expertise in providing emissions solutions to customers in power generation and other industries, enables the Company to enhance its existing market position in activated carbon, boost its exposure to higher growth and higher margin products, significantly cut its carbon footprint and facilitate a fully integrated supply chain. The acquisition also created potential opportunities for the Company to enter into additional markets beyond activated carbon, with its proprietary Arq powder as a lower emissions alternative to existing products and feedstocks.
Shares of our common stock may be purchased by individuals or through licensed brokers using the public market. We do not sell shares of our common stock directly to investors.
Computershare serves as our transfer agent. If you are a registered shareholder, they can help you with a variety of shareholder-related services, such as replacing a lost stock certificate, transferring the ownership of your shares, updating your mailing address for future shareholder communications, etc. You may contact Computershare online by visiting their website ( or by telephone by calling 1-800-962-4284
Financial information and/or copies of our quarterly /annual financial statements can be obtained by clicking on the link provided below or by visiting the SEC website (

Financial Statements
Information regarding our senior management team, as well as the current composition of our board of directors and their respective professional qualifications, is provided through the links below. This information is also contained in our annual proxy, which can be viewed online by visiting the SEC website (

Board of Directors
Leadership Team
We are aware of occasional confusion among investors regarding Arq's insider stock transactions. Similar to many public companies, Arq's employee stock incentive program requires that we conduct “sell-to-cover” transactions upon vesting of certain incentive awards (including restricted stock awards (RSAs) to satisfy the tax withholding obligation. This policy is applicable to all Arq employees. Further, as a public company, all stock transactions, voluntary as well as non-discretionary, made by Arq Section 16 officers must be reported publicly to the Securities and Exchange Commission (SEC) – this includes open market purchases/sales as well as both the award / grant of new RSA s, and the sale to cover anticipated taxes. While sell-to-cover transactions are not the same as an executive proactively selling shares (since the sale-to-cover is an automatic sale to cover taxes at the time of vesting), these transactions are often reported inaccurately by some news outlets and interpreted by investors as proactive selling by insiders. You should expect to see these sell-to-cover transactions periodically as more RSAs (or other equity awards) vest. Please note, you can confirm the nature of a stock transaction by referencing the footnotes in the Form 4 disclosure filed with the SEC.
Our corporate headquarters are located at 8051 E. Maplewood Ave, Suite 210, Greenwood Village, CO 80111. All written correspondence should be sent to this address. To contact us via phone, please dial 720-598-3500. You may also contact us through our website (
Our independent registered public accounting firm is Moss Adams LLP.
If you have a concern regarding alleged Misconduct, you should report it promptly to the Company’s independent Whistleblower Hotline at 1-844-490-0002, Website URL ( or email (must include company name with report). You may submit concerns anonymously or on a confidential basis. Anonymous calls are transcribed by the Hotline vendor prior to sending to defined Arq Complaint recipients for review and resolution. If the individual filing the Complaint does not provide a means to respond to the Complaint, the Company will not be required to take additional steps to respond. All Complaints will be kept confidential to the fullest extent reasonably practicable within the requirements of the law and the needs of any ensuing evaluation or investigation.
For information related to Investor Relations, please contact Anthony Nathan (Arq) or Marc Silverberg (ICR) at