Amazon spent nearly $23 billion on R&D last year — more than any other U.S. company

Pouring resources in to Alexa, AWS and experiments like Amazon Go, Amazon invested nearly $23bn on R&D last year, nearly 1/3 of the total spend of the top 5 (next come Alphabet, Intel, Microsoft, and Apple).
https://www.recode.net/2018/4/9/17204004/amazon-research-development-rdTech companies claimed the top five spots again this year.