Subcommittee Chairman David Cicilline has been looking in to allegations by critics that the companies have hurt competitors and consumers with their business practices
The panel has conducted a bipartisan investigation over the past year of the tech giants' market dominance and their effect on consumers
When providing a marketplace for independent sellers, Amazon continuously collects data about the activity on its platform
However, the CCI added it had decided not to impose a penalty, saying the "ends of justice would be met if the parties cease such cartel behaviour and desist from indulging in it".
The CCI ordered an investigation against e-commerce players last month after the Delhi Vyapar Mahasangh, a traders' body, filed a complaint against the firms' practices like giving deep discounts
Microsoft is one of the few big U.S. technology companies not under regulatory scrutiny in Washington
It's important to note that the economics profession isn't in universal agreement about the issue