The $1 million donations came gradually — and then all at once.

Meta. Amazon. OpenAI’s Sam Altman. Each of these Silicon Valley companies or their leaders promised to support President-elect Donald J. Trump’s inaugural committee with seven-figure checks over the past week, often accompanied by a pilgrimage to Mar-a-Lago to bend the knee.

The procession of tech leaders who traveled to hobnob with Mr. Trump face-to-face included Sundar Pichai, Google’s chief executive, and Sergey Brin, a Google founder, who together dined with Mr. Trump on Thursday. Tim Cook, Apple’s chief executive, shared a meal with Mr. Trump on Friday. And Jeff Bezos, the founder of Amazon, planned to meet with Mr. Trump in the next few days.

This was the week when many tech companies and their top executives, as reluctant as they may have been, acknowledged the reality of getting business done in Mr. Trump’s Washington. With their donations, visits and comments, they joined a party that has already raged for a month, as a cohort of influential Silicon Valley billionaires, led by Elon Musk, began running parts of Mr. Trump’s transition after endorsing him in the campaign.

While businesses frequently try to get on an incoming president’s good side, the frenzy of tech activity stood out from other industries. Until President Obama’s administration, the tech industry had largely stayed aloof from politics. Some wrote just small checks for Mr. Trump’s first inauguration.

Now the bread-breaking with Mr. Trump has become highly public. Meta and Amazon, whose founders had previously been criticized by Mr. Trump, said they would donate $1 million to Mr. Trump’s inaugural fund this week. Sam Altman, the chief executive of OpenAI, the high-profile artificial intelligence start-up, said on Friday that a $1 million donation to Mr. Trump’s inaugural fund would come from him personally.