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.
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Other recent filings from the company include the following:
BlackRock, Inc. just provided an update on share ownership of ADA-ES - Jan. 19, 2018
ADA-ES's Chief Accounting Officer just disposed of 950 shares - Jan. 17, 2018
ADA-ES's President & CEO just disposed of 9,878 shares - Jan. 4, 2018
ADA-ES's Chief Product Officer just disposed of 599 shares - Jan. 4, 2018
Entry into a Material Definitive - Jan. 4, 2018