Nov 17 (Reuters) - Amazon ( AMZN ) will raise $15

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

according to a filing with the Securities and Exchange

Commission on Monday, as big tech firms ramp up investments in

AI infrastructure.

Big technology firms are turning to debt sales worth

tens of billions of dollars to fund infrastructure expansions as

demand for artificial intelligence workloads surges.

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

on Monday. Proceeds may be used for everything, from

acquisitions and capital expenditures to share buybacks.

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

according to Bloomberg News, which first reported the

development.

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.

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.