The Fed's Board of Governors now requires Barclays,
The requirements, approved unanimously Tuesday, are similar to those for the largest U.S. banks.
Michel Barnier, the European commissioner for internal market and services, plans to examine the new measures for their "potential impact on the global level playing field" of banking markets to ensure competition "on an equal footing," said Barnier's spokeswoman, Chantal Hughes.
The new rules would apply to foreign banks with $50 billion or more in assets in the U.S. Those firms would have to set up U.S. holding companies and would be required to comply with Federal Reserve risk-management standards.
The Fed estimated that 15 to 20 foreign banks, many based in the European Union, would have to set up new holding companies in the U.S.
"As the financial crisis demonstrated, the sudden failure or near failure of large financial institutions can have destabilizing effects on the financial system and harm the broader economy," Fed Chairwoman
The new rules were required by the 2010 Dodd-Frank financial reform law. Foreign banks have until July 1, 2016, to comply, a year later than originally proposed.
"We have been anticipating the release of this rule, and have had a program up and running for more than a year to plan for our compliance," said Barclays, which is based in London. "We are reviewing the final rule, we note the extended timeline to comply and we are confident that we have options that will allow us to implement the new regulations in the prescribed time frame."
Hughes said the European Commission "has sympathy for the general objective" of Fed officials to limit the risks taken by banks operating in the U.S. But she reiterated concerns "about the way in which this significant regulatory reform has been introduced."
She said the Fed unilaterally enacted the rules instead of working cooperatively with regulators in other countries.
The requirement to set up U.S. holding companies "imposes a substantial organizational cost" on foreign banks, Hughes said. And the Fed is implementing a "one-size-fits-all regulatory treatment" for all large foreign banks operating in the U.S. without regard for the regulatory requirements and supervision of their home regulators, she said.
"In general, this approach seems at odds with the long-standing efforts to move toward a globally consolidated supervision of large banking groups, under the responsibility of the authorities of the parent," Hughes said.
Fed Gov. Daniel K. Tarullo said the Fed tried to be responsive to foreign concerns and made changes to the original proposal.
But he said that there were problems during the 2008 financial crisis with foreign banks operating in the U.S., such as potential funding shortfalls that "made them disproportionate users" of emergency programs set up by the Fed.
"The most important contribution we can make to the global financial system is to ensure the stability of the U.S. financial system," he said.