The Inria@SiliconValley Program was initiated in 2011 based on Inria collaborations with University of California at Berkeley and Stanford University and has since been expanding. The program builds research and innovation partnerships in California, with the aim to carry out joint projects with a transatlantic impact. The program leverages the Inria International mobility and Associate Team programs, resulting among others in 23 joint scientific projects plus 4 new ones starting in 2015. The report proposes a walk through the various activities and outcomes of Inria@SiliconValley over its first 4 years, and also an introduction to the plan for the next four years.