Confirmed activity takes place behind the authorized wall -

http://secsearch.sec.gov/search?utf8=%E2%9C%93&affiliate=secsearch&query=cryptsy

try -

http://secsearch.sec.gov/search?utf8=%E2%9C%93&affiliate=secsearch&query=kraken

or

http://secsearch.sec.gov/search?utf8=%E2%9C%93&affiliate=secsearch&query=poloniex