WASHINGTON—Employees of big technology firms were a key source of contributions for Joe Biden’s presidential campaign, newly released campaign finance records show, eclipsing donations from employees at traditional Democratic fundraising sources such as banks and law firms.

Employees of Google’s parent, Alphabet Inc., and Microsoft Corp. , Amazon.com Inc., Apple Inc. and Facebook Inc. were the five largest sources of money for Mr. Biden’s campaign and joint fundraising committees among those identifying corporate employers, according to a Wall Street Journal analysis of campaign finance reports.

Mr. Biden’s presidential campaign received at least $15.1 million from employees of those five tech firms, records show. The companies declined to comment.

The previous Democratic presidential candidates Hillary Clinton and Barack Obama also received large contributions from tech company employees, but their top sources of employee donations extended beyond the tech sector.

Mrs. Clinton’s biggest sources of funds from those identifying corporate employers in 2016 included employees of the personal injury law firm Morgan & Morgan and JPMorgan Chase & Co., along with Google, Microsoft and Apple, according to election records compiled by the nonpartisan Center for Responsive Politics.

This post first appeared on wsj.com

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