Co-developed and led by Andrea Wallace and me since March 2018, the Open GLAM survey records instances of open access policy and practice in the GLAM (Galleries, Libraries, Archives, Museums) sector. Today, the survey lists 1,424 institutions that have published open access data, from Aruba to Venezuela. Housed in a public Google Sheet, the survey has grown in scale and complexity over the past four years. In advance of the survey’s fourth anniversary, Andrea and I have restructured, checked and cleaned the data. …