The lines around what constitutes a hedge fund aren't always clear in the data, or in the financial industry. But the numbers are stark. The top five contributors to pro-Clinton groups are employees or owners of private investment funds, according to federal data released last week and compiled by OpenSecrets.org, the center's website. The data show seven financial firms alone have generated nearly $48.5 million for groups working on Mrs. Clinton's behalf.

The total for Donald Trump: About $19,000.