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Jim, Alice, and Rob Walton have each increased their net worth by about $22 billion this year. REUTERS/Rick Wilking

Three heirs to the Walmart fortune are close to becoming centibillionaires.

Jim, Rob, and Alice Walton are now worth more than $92 billion each as Walmart stock soars.

The trio's combined net worth has reached $280 billion, well ahead of Elon Musk's $239 billion fortune.

Three Walmart heirs could soon be worth $100 billion each — and together they're already richer than the world's wealthiest person, Elon Musk.

The three surviving children of the late Jim Walton — Jim, Rob, and Alice — command net worths between $92 billion and $95 billion, per the Bloomberg Billionaires Index.

Their combined wealth stood at $280 billion at Thursday's market close — a figure that dwarfs Musk's $239 billion fortune and is roughly equal to Berkshire Hathaway's cash pile at the end of June.

The trio of Waltons have each added about $22 billion to their net worths this year, thanks to Walmart stock surging 39% since the start of January to close at a record $73 on Thursday.

The dynastic heirs to the Walmart fortune rank 16th, 17th, and 18th on Bloomberg's rich list. If they cross the $100 billion mark in wealth, they'll join an elite club of centibillionaires that includes Musk, Jeff Bezos, Bill Gates, and Warren Buffett.