The Forbes 400 survey estimated in 2004 that Teresa Heinz Kerry had a net worth of $750 million. However, estimates have frequently varied, ranging from around $165 million to as high as $3.2 billion, according to a study in the Los Angeles Times. Regardless of which figure is correct, Kerry was the wealthiest U.S. Senator while serving in the Senate. Independent of Heinz, Kerry is wealthy in his own right, and is the beneficiary of at least four trusts inherited from Forbes family relatives, including his mother, Rosemary Forbes Kerry, who died in 2002. Forbes magazine (named for the Forbes family of publishers, unrelated to Kerry) estimated that if elected, and if Heinz family assets were included, Kerry would have been the third-richest U.S. President in history, when adjusted for inflation. This assessment was based on Heinz and Kerry's combined assets, but the couple signed a prenuptial agreement that keeps their assets separate. Kerry's financial disclosure form for 2011 put his personal assets in the range of $230,000,000 to $320,000,000, including the assets of his spouse and any dependent children. This included slightly more than three million dollars worth of H. J. Heinz Company assets, which increased in value by over six hundred thousand dollars in 2013 when Berkshire Hathaway announced their intention to purchase the company.