Inside University of California, Los Angeles's largest research partnership: University of California, Berkeley

Behind University of California, Los Angeles's research output sits a defining relationship: 4,261 co-authored works with University of California, Berkeley (United States) in the five years to 2025, the university's single largest collaboration.

It anchors an unusually connected research base: 1,174 collaborating institutions across 81 countries, producing 99,189 joint works over the window, with international co-authors on 34% of output.

The collaborative work travels: its field-weighted citation impact stands at 3.45, where the world average is 1.0.

The Research Collaboration Index, the first global account of how universities actually collaborate, publishes its first full edition on Tuesday 15 September at 09:00 UK.

Every figure derives from the open global research record and is checkable at source.