"People have always talked about how corporate lobbying dominates Brussels, but now we know by how much," report author and Transparency International EU Integrity Policy Officer Daniel Freund told CNBC Thursday.
"We can also see that clear link that leads us to believe that money does buy influence, when the biggest spenders get the most access to the Commission," he added.
Both Google and GE face regulatory and legal battles in Europe at present.
Read MoreEU files antitrust charges against Google
Google is been hit with antitrust charges, after the EC claimed the company's internet search service was skewing results to featured its own services, including shopping ads.
Given the backdrop, a Google spokesperson told CNBC that meetings with officials were an opportunity to clear the air.
"As we've said before, we want to do a better job of listening to Europe's concerns and explaining how our business works in Europe," a Google spokesperson said by email.
GE, meanwhile is fighting a lengthy battle to secure a $17 billion merger with the energy business of France's Alstom's that has raised competition concerns.
In a statement to CNBC, a representative for GE confirmed the company was "actively engaged with the European Commission" with regards to the deal.