(Bloomberg) -- For years, Elon Musk’s net worth has been dominated by one stock: Tesla Inc.
His purchase of a 9.2% stake in Twitter Inc., disclosed Monday in a regulatory filing, adds an unusual element of diversification to his $273 billion fortune.
Musk’s holding in his favored social-media platform was valued at $2.89 billion as of market close Friday. So far he’s done well: The billionaire is up more than $1 billion based on Twitter’s closing share price on March 14, the date of the event that triggered the disclosure, and its opening trading level on Monday.
Even though Musk is now Twitter’s biggest shareholder, his holding still represents just a fraction of his overall wealth. As of Friday, the vast majority of Musk’s net worth was tied to shares and options in Tesla, where he’s chief executive officer. He owns about 17% of the electric-vehicle maker, which has soared in value in recent years and catapulted Musk to the top of the list of the world’s richest people.
Musk, 50, also owns almost half of private space exploration company SpaceX, an interest worth $40.3 billion, according to the Bloomberg Billionaires Index.
The Tesla co-founder has stayed focused on the company even as his fortune has soared. His family office, Excession, is run by longtime adviser Jared Birchall, a former Morgan Stanley banker, and is relatively small compared with other billionaires.
Musk doesn’t own much in the way of real estate after selling multiple mansions in California and vowing to “own no home” in 2020. He had disposed of very little of his Tesla stake until late last year, when he sold millions of shares to cover the cost of what he said was an $11 billion tax bill related to exercising options.
Even after his estimated taxes, the proceeds from those sales left Musk with cash holdings of more than $5.7 billion, according to the Bloomberg index, before acquiring the Twitter shares.
Musk also signaled at the time he would become more of a philanthropist. Last year he donated more than 5 million Tesla shares to charity, worth about $5.7 billion. That came a few weeks after suggesting on Twitter he would sell stock if the United Nations proved $6 billion would help solve world hunger.
It’s unclear where that record donation for the billionaire actually went. He has a foundation, the Musk Foundation, that has historically granted less than $50 million a year, largely to donor-advised funds. Musk has hired a professional poker player-turned-philanthropist to help him dole out the money.
Musk has become one of the biggest personalities on Twitter with his more than 80 million followers. He has also occasionally run into trouble. He’s looking to exit a 2018 deal with the U.S. Securities and Exchange Commission that limited his posts about Tesla.
The type of SEC form he used often indicates the investor isn’t seeking to acquire control of a company, or to influence who controls it.
--With assistance from Tom Maloney and Sophie Alexander.
To contact the author of this story:
Devon Pendleton in New York at [email protected]