Spokesperson Caitlin Hayden

The US on Friday imposed further sanctions on several businesses, banks, and individuals in Iran for reported involvement in Iran's nuclear program, supporting terrorism or aiding the country's evasion of international sanctions.
"The United States remains committed to working with our P5+1 partners toward a long-term, comprehensive solution that provides confidence that Iran's nuclear program is exclusively peaceful," said National Security Council Spokesperson Caitlin Hayden in a statement from the White House.
Hayden affirmed today's sanctions "are consistent with our commitments under the Joint Plan of Action, which provided limited relief of certain sanctions in exchange for Iranians steps that halted its nuclear program and rolled it back in key respects." The Treasury Department reiterated in its own statement that any person in the US is prohibited from engaging in transactions with the designated entities.
Additionally, anyone outside the US facilitating in such "deceptive transactions" with these accounts could be subject to sanctions themselves.