Cook has personally given $10,800 to Republican candidates and joint fundraising committees and $10,400 to committees on the Democratic side since 2008, according to reports filed to the Federal Election Commission. While he is by no means a large donor, Cook has increased his activity in this election cycle, with about 90 percent of those donations coming since April 2015.
Cook hosted a fundraiser for Republican House Speaker Paul Ryan earlier this year, giving $7,100 to his campaign and a joint committee with the GOP in June. Last year, he gave maximum $2,700 donations to the campaigns of GOP Sen. Rob Portman of Ohio and Democratic Sens. Chuck Schumer of New York and Patrick Leahy of Vermont.
Donors often give to both sides of the aisle, even in the Democratic-leaning world of Silicon Valley. Cook may most obviously support Republican policy on corporate taxes, as he has criticized the U.S. business tax rate as Apple parks $215 billion in cash overseas.
Apple did not immediately respond to a request for comment on why Cook is raising money for Clinton or has increased his donation activity this election cycle.
Cook's predecessor, late Apple co-founder Steve Jobs, was a frequent Democratic donor in the late 1990s and early 2000s. He gave to Rep. Nancy Pelosi and Sen. Ted Kennedy, among others.
As for Silicon Valley as a whole, technology is not among the top 10 industry donors to either Clinton or Republican nominee Donald Trump, according to the Center for Responsive Politics. Billionaire venture capitalist Peter Thiel backs Trump and spoke at the Republican National Convention, but the FEC lists no Thiel donations to Trump.
However, donors from the large and Democratic-leaning California gave more to Clinton's campaign than any other state through June, the Center for Responsive Politics said.