** Shares of Riot Blockchain RIOT.O down 5.6 pct after
company discloses https://www.sec.gov/Archives/edgar/data/1167419/000107997318000264/riot_10k-123117.htm
receipt of a SEC subpoena earlier this month
** The med-tech co turned crypto-play did not say why it had
been subpoenaed, but said it intends to fully cooperate
** A CNBC report http://cnb.cx/2Hmh5iD in Feb highlighted
red flags in RIOT's SEC filings; Riot called it a "one-sided
piece" urn:newsml:reuters.com:*:nL2N1Q61S0
** SEC's probe into Riot Blockchain is its latest on
cryptocurrency- and blockchain-related stocks
** Earlier April, SEC targeted allegedly illegal stock sales
involving Longfin stock LFIN.O ; LFIN stock halted since then
urn:newsml:reuters.com:*:nL2N1RJ0YL
** SEC also investigated Overstock.com's OSTK.O sale of
cryptocurrency to investors in March urn:newsml:reuters.com:*:nL4N1QJ593
** RIOT shares have lost nearly all its value YTD after
surging 8x its value in 2017
(Reporting by Shreyashi Sanyal in Bengaluru)
((RM: Shreyashi.Sanyal.thomsonreuters.com@reuters.net))