Inside Universidad Rey Juan Carlos's largest research partnership: Universidad Complutense de Madrid

Behind Universidad Rey Juan Carlos's research output sits a defining relationship: 1,157 co-authored works with Universidad Complutense de Madrid (Spain) in the five years to 2025, the university's single largest collaboration.

It anchors an unusually connected research base: 891 collaborating institutions across 72 countries, producing 15,930 joint works over the window, with international co-authors on 24% of output.

The collaborative work travels: its field-weighted citation impact stands at 2.25, 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.