The company just notified that it has made a paper-based filing, with more info as follows:
The above information was disclosed in a filing to the SEC. To see the filing, click here.
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Other recent filings from the company include the following:
ADA-ES Just Filed Its Quarterly Report: Basic earnings per s... - Nov. 6, 2017
ADA-ES: Advanced Emissions Solutions Reports Quarter Results - Nov. 6, 2017