Mrs. Clinton was confirmed by the Senate on Wednesday as President Obama's secretary of state and assumed her formal duties with a State Department ceremony Thursday.
However, Mrs. Clinton's office and the foundation have declined to answer questions about a lucrative 2006 stock transaction, details of which were reported by The Washington Times in March 2008.
The Accoona Corp. donated between $250,001 and $500,000 to Mr. Clinton's charity after he spoke at the company's launch in New York in 2004, according to donor information released by the foundation in December. The foundation sold its Accoona stock for $700,000 two years later, according to the charity's tax return for 2006.
Despite what the tax return suggests, Accoona struggled mightily to turn a profit.
In 2007, Accoona filed a prospectus with the Securities and Exchange Commission reporting more than $60 million in losses during three years. In the same prospectus, it listed the China Daily Information Corp., a subsidiary of China Daily, the official English-language newspaper of the Chinese government, as an official partner and 6.9 percent owner of the company.