BlackRock, Inc. just filed a "Statement of acquisition of beneficial ownership", which is also known as a 13G. In the filing, it appears as though BlackRock, Inc. claims to own 3841827 shares. This represents 17.5% of ADA-ES.
Please note that typos are common in SEC filings. Please verify the information reported above before acting on it.
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Other recent filings from the company include the following:
Submission of Matters to a Vote of Security - June 21, 2018
ADA-ES's SVP of Operations of ADA-ES just disposed of 1,228 shares - May 29, 2018