Elon Musk donated roughly $1.9 billion of Tesla Inc. stock to charity last year, according to a regulatory filing made Tuesday.

Mr. Musk, Tesla's chief executive, reported having donated roughly 11.6 million shares last year, fewer than he donated in 2021, adjusted for the 3-for-1 split in the company's shares that took effect in 2022. The securities filing doesn't name any recipient for the donations.

Mr. Musk's charitable donations in 2021 were valued at the time at $5.7 billion.

Tesla didn't respond to a request for comment on what charity or charities received the shares.

Mr. Musk, who now owns around 13% of Tesla, also sold roughly $23 billion of his holdings in the car company throughout 2022, at least in part to support Twitter Inc. The billionaire bought the social-media company last fall in a deal valued at $44 billion.

He signaled late last year that he wouldn't sell any additional Tesla stock for a minimum of 18 months to 24 months.

Tesla's stock fell 65% last year, its worst annual performance on record, erasing around $675 billion in market valuation. The rout meant Mr. Musk ceded the unofficial title as world's richest person to French billionaire Bernard Arnault in December.

The Internal Revenue Service values stock gifts based on the average of a stock's high and low on the day of a reported transaction.