SAN FRANCISCO — Jack Dorsey, the chief executive of Twitter and Square, said on Tuesday that he planned to donate $1 billion, or just under a third of his total wealth, to relief programs related to the coronavirus, in one of the more significant efforts by a tech billionaire to fight the pandemic.
Mr. Dorsey said he would put 28 percent of his wealth, in the form of shares in his mobile payments company Square, into a limited liability company that he had created, called Start Small. Start Small would make grants to beneficiaries, he said, with the expenditures to be recorded in a publicly accessible Google document.
“Why now? The needs are increasingly urgent, and I want to see the impact in my lifetime,” Mr. Dorsey said in a series of tweets announcing his plans. “I hope this inspires others to do something similar.”
Mr. Dorsey, 43, joins a growing list of celebrities, world leaders and technologists who are earmarking some portion of their wealth to fighting the spread of the coronavirus and its effects.
Oprah Winfrey has donated more than $10 million of her personal wealth to Covid-19 relief efforts, while other Hollywood personalities — including Justin Timberlake, Dolly Parton and Rihanna — have also made contributions. Last week, the Amazon chief executive, Jeff Bezos, said he would donate $100 million to American food banks through a nonprofit, Feeding America. And Mark Zuckerberg, chief executive of Facebook, has also organized relief campaigns through Facebook and his own philanthropic organization, the Chan Zuckerberg Initiative.
Even so, Mr. Dorsey’s contribution stands out for the sum he is putting in and for how much of his net worth that represents.
Square declined a request for an interview with Mr. Dorsey. Twitter declined to comment.
In creating a limited liability company, Mr. Dorsey is following a model that Mr. Zuckerberg has used. In 2015, when Mr. Zuckerberg and his wife, Priscilla Chan, set up the Chan Zuckerberg Initiative, it was organized as an L.L.C., holding much of their wealth to fund charitable causes.
At the time, critics said the vehicle was a self-serving maneuver that allowed Mr. Zuckerberg to engage in private lobbying, for-profit investment and political donations. Mr. Zuckerberg pushed back, saying a limited liability company gave him and his wife more control over how their resources would be put to use.
Mr. Dorsey, who has been criticized in the past for his lack of transparency around philanthropic efforts, said he was creating an L.L.C. for flexibility and pledged to use the Google document to update the public on its latest grants, stock transfers and sales.
He said the first $100,000 donation would be to America’s Food Fund, a high-profile effort committed to feeding the hungry. It was started in a GoFundMe page last week by Leonardo DiCaprio, Laurene Powell Jobs and Apple.
After the most pressing matters of the pandemic are resolved, Mr. Dorsey said, he plans to shift the aim of Start Small to supporting initiatives around universal basic income, under which Americans would get a base level of regular income from the federal government, and women’s health and education efforts.
Universal basic income has been a pet issue for some Silicon Valley progressives, made more popular in recent months by the now-ended presidential candidacy of Andrew Yang, a Democrat who ran partly on the idea.
“Life is too short, so let’s do everything we can today to help people now,” Mr. Dorsey tweeted, followed by an emoji of a peace sign hand gesture.