Nov 17 (Reuters) - Amazon ( AMZN ) is set to raise $15

billion from its first U.S. dollar bond offering in three years,

Bloomberg News reported on Monday, as big tech firms increase

investments to build infrastructure for artificial intelligence.

The proceeds topped initial estimates of $12 billion, the

report said.

As artificial intelligence workloads grow, big

technology firms are turning to large-scale debt sales to fund

infrastructure expansions that cost tens of billions of dollars.

At the peak, the bond attracted about $80 billion of demand,

Bloomberg reported, citing people with knowledge of the matter.

Proceeds may be used for everything, from acquisitions and

capital expenditures to share buybacks.

Amazon ( AMZN ) did not immediately respond to a Reuters request for

comment.

The e-commerce giant filed for a six-part bond sale on

Monday without disclosing a size, a regulatory filing showed. It

declined to provide further details on the bond sale.

Pricing discussions for the longest portion of the deal,

a 40-year bond, tightened to 0.85 percentage point above

Treasuries, from 1.15 percentage point initially, the report

said, citing the people.

Last month, Meta Platforms ( META ) announced its biggest

bond sale of up to $30 billion, while cloud infrastructure and

software maker Oracle is also reportedly looking to

raise $15 billion in bond sales.

Major tech firms including Meta, Amazon ( AMZN ) and Alphabet

are expected to spend $400 billion on AI

infrastructure this year, according to Morgan Stanley

estimates.

Amazon ( AMZN ) has been spending more on AI with its capital

expenditure expected to total around $125 billion this year and

more the year after. It recently announced a $38 billion deal

with OpenAI, giving a major lift to its cloud unit after losing

ground to Microsoft ( MSFT ) and Google.