One focus of the inquiry is how private equity firms value their investments and report performance.
The firm provided no further details about the focus of the inquiry.
The subpoena is a sign that Mr. Bannon is not personally the focus of the inquiry.
The focus of the inquiry will be the involvement of MI6 in the arrest and rendition of two men.
None of the companies appear to be a focus of the inquiry and all have denied wrongdoing.
Datek Online, the popular online trading unit, is not the focus of the inquiry, people close to the investigations say.
Some people following the case suggested today that Mr. Baker was not the main focus of the inquiry.
India's Supreme Court on Friday temporarily suspended all iron ore mining in Bellary, the region that was the main focus of the inquiry.
She told the Commons that Justice Goddard was "as removed as possible from the organisations and institutions that might become the focus of the inquiry".
The Leveson Inquiry opened almost 18 months ago, with Lord Justice Leveson declaring "The focus of the Inquiry is the culture, practices and ethics of the press".
The focus of the inquiry is still the run-up to the sale of BHS, which looks more extraordinary as the evidence piles up.
