Reuters Three of the Wall Street39;s heavyweight technology firms have reported betterthanexpected sales at their cloud computing units in recent days, as interest in artificial intelligence drives a rebound in spending by corporate customers.

Growth in the 270 billion cloud infrastructure market, a cash engine for Amazon.com, Microsoft and Alphabet, gives the clearest sign yet that AI investment is bearing fruit after investors drove those stocks to record highs, thanks to optimism about the emerging technology.

Many big customers have started spending again on cloud computing after pausing last year to cut costs, executives and analysts said.

Amazon, the last of trio to report on Tuesday, said its cloud computing arm AWS grew 17 in the JanuarytoMarch period, above Wall Street39;s 15 growth estimate, and hit a 100 billion annual runrate for the first time.

Performance was consistent at Microsoft39;s Azure and Google Cloud, which grew above expectations at 31 and 28, respectively, in the first three months of the year.

Looking across AWS, Microsoft Azure and Google Cloud, it is clear that two things are happening simultaneously AI is contributing to growth, but also the rest of cloud spending is accelerating, said D.A. Davidson Co analyst Gil Luria.

For several years cloud infrastructure providers enjoyed growth rates as high as 60 and demand shot up during the COVID19 pandemic as more businesses moved online. However, firms had to realign expectation last year…