R is the de facto standard for statistical computing at academic institutions and companies around the world. Its great support for literate programming (code that can be combined with human-readable text) enables researchers and data scientists to create publication-ready reports which are easy to reproduce for reviewers.
The language has seen a wide adoption in various industries—see some examples below:
Pharma: Merck, Genentech (Roche), Novartis, Pfizer
Newspapers: The Economist, The New York Times, Financial Times
See also the R Consortium page for further information about industrial partners and initiatives.