Ofcom said it had identified features that made it more difficult for UK businesses to use multiple cloud suppliers.
Amazon Web Services (AWS) and Microsoft had a combined 70-80% share of Britain's public cloud infrastructure services market in 2022, Ofcom said.
Microsoft said it was committed to ensuring the UK cloud industry remained innovative and highly competitive.
UK businesses told Ofcom they were concerned it was too difficult to switch or mix and match cloud providers.
Google vice president Amit Zavery said Ofcom's referral demonstrated the need to create an open cloud market with no vendor lock-in.
Persons:
Dado Ruvic, Ofcom, Fergal Farragher, Amit Zavery, Yadarisa, Paul Sandle, Lincoln, Susan Fenton, Mark Potter, Jan Harvey
Organizations:
REUTERS, CMA, Ofcom, Microsoft, Amazon Web Services, Google, Markets, AWS, Reuters, Thomson
Locations:
Bengaluru, London