BOSTON Massachusetts’ top securities regulator said on Friday that his office is looking into whether top Wall Street investment banks in addition to Citigroup have leaked research in violation of state law on how to share this kind of information. “We are looking at all of them, Morgan Stanley, Goldman Sachs, JPMorgan,” regulator William Galvin said in a telephone interview about the probe. “It is a very active investigation,” Galvin said, declining to give more information about what kind of charges may be made. Earlier on Friday, Galvin’s office said it has won a $ 2 million settlement with Citigroup [...]