Uber's share of the U.S. ground transportation market among business travelers fell slightly in the third quarter, while smaller ride-hailing competitor Lyft boosted its market share, according to a report released Tuesday by travel-expense software maker Certify.

Uber's market share was 54% in the third quarter, down from 55% in the second quarter. Lyft's share rose 3 percentage points to 11%, said Certify, which cited data culled from more than 10 million receipts and expenses.

This shift was most pronounced in Uber's and Lyft's home base of San Francisco, where Uber's share among business travelers fell 8%, while Lyft's rose 9%.

Meanwhile, the market share of car rental companies and taxis each fell one percentage point to 28% and 7%, respectively.

The result is more good news for Lyft, which last week said it received a $1 billion funding round led by Google parent Alphabet.

Closely held Lyft, founded in 2012, continues to grow as it competes against the much larger Uber. That company has been valued at as much as $60 billion.

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