Christopher Shackelton just filed a "Statement of acquisition of beneficial ownership", which is also known as a 13G. In the filing, it appears as though Christopher Shackelton claims to own 2,090,456 shares. This represents 9.4% 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: