Still, even Mr. Slinker says there is good reason for the lack of enthusiasm. “Silicon Valley is an extremely disruptive place, but the one thing it doesn’t want disrupted is Silicon Valley,” he said. “And so it’s pushing back on Trump.”

The venture capitalist Marc Andreessen, who backed Mr. Romney in 2012, said on Twitter that he was supporting Mrs. Clinton. Meg Whitman, a former candidate for governor in California who now runs Hewlett Packard Enterprise, labeled Mr. Trump “unfit to be president.” When Mr. Thiel was revealed as a Trump delegate, a columnist for the tech news site Pando said he was “utterly ashamed” that Mr. Thiel was a Pando investor. Mr. Thiel declined to comment.

Another Trump supporter in Silicon Valley, Tyrone Pike, had some business dealings with the candidate many years ago in Atlantic City, N.J., and was favorably impressed. As for Mr. Trump’s more extreme pronouncements, “I kind of write them off,” said Mr. Pike, who sold a software start-up to Citrix and is building another company. “He’s more of a moderate than any of his words.”



Earlier in the primaries, Mr. Trump suggested boycotting Apple if the company did not help the government crack the iPhone used by one of the attackers in the mass shooting last year in San Bernardino, Calif.; clashed with Mr. Zuckerberg over immigration; and posted on Twitter that if Amazon “ever had to pay fair taxes, its stock would crash.”

Bobby Franklin, the president of the National Venture Capital Association, thinks Mr. Trump will pick up support among tech people as he moderates his views.

“The Trump we have all witnessed for the past several months is probably not the Trump we will all be thinking about as we go into the voting booth,” said Mr. Franklin, whose organization does not endorse presidential candidates. “A general election candidate has always been different than a primary candidate.”

Yet a few weeks ago, after Mr. Trump’s primary opponents all dropped out and he might have been expected to make conciliatory noises, he unloaded again on Amazon and Mr. Bezos. Mr. Trump said, among other things, that Mr. Bezos has “got a huge antitrust problem because he’s controlling so much.”