Riot Blockchain announced what it called "material weaknesses" in internal control over financial reporting and an adverse auditor report in its latest annual report.
Potential Lyft investors are questioning how and when the company will make money.
PolarityTE said the SEC subpoenaed it earlier this month for documents related to any promotion of the company or its securities, among other items.
The cryptocurrency company whose stock skyrocketed after changing its name, revealed that the SEC subpoena and investigation are "still ongoing," according to its most recent quarterly filing.
The CEO and chairman of Riot BlockChain has resigned in the wake of unrelated charges by the Securities and Exchange Commission against him for alleged fraud in connection with other companies.
The Securities and Exchange Commission announced on Friday charges against a group of 10 individuals and their associated entities for long-running fraudulent schemes that brought in over $27 million.
The investigation could result in a stop order preventing the company and shareholders from selling shares.
Riot Blockchain, the cryptocurrency company whose stock skyrocketed after changing its name, revealed that the SEC subpoena it received in April was “pursuant to a formal order of investigation."
As bitcoin hit record highs in December, Riot Blockchain’s stock shot up. A CNBC investigation found the company has many red flags.
U.S. government personnel serving in Cuba appear to have "widespread" neurological damage, say doctors working for the State Department.
Data also provided by 
