Foundation for marathon bombing victims attracting more big corporate donors

The new One Fund Boston foundation launched to help victims of the marathon bombings has secured more large corporate donors, according to people briefed on the fund-raising. The city was expected to announce a list of new donors Friday.

Fund-raising could exceed $10 million just this week, according to the people briefed on the matter. Large corporate donors include Bain Capital, State Street Corp. and TJX Cos.

Bain Capital has pledged $1 million, according to the sources. John Hancock Financial, the marathon sponsor, seeded the nonprofit with a $1 million gift. AT&T Inc. pledged the same amount.

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State Street Corp.’s foundation pledged $500,000 to the fund and is encouraging employees to give more, donations it intends to match. The financial services company is hoping to contribute a total of $1 million, according to people briefed on the matter, who were not authorized to discuss the details. State Street’s chief executive, Jay Hooley, also was asked to join the board of the organization and agreed, the person said.

Retailer TJX also has pledged $500,000, according to the sources.