Released Dec 8, 2025 and effective immediately, the National Science Foundation (NSF) has issued a supplement to the 24-1 edition of the Proposal and Award Policies and Procedure Guide (PAPPG).
PAPPG Chapter 11.D.2.i(ii) contains information on Data Management and Sharing Plan requirements for proposals, and the supplement adds to that section the following statement:
Recipients are required to share all data supporting NSF funded publications at the time of publication. Exceptions to this sharing requirement should be described and justified within the DMSP.
NSF has long required sharing of data that results from NSF funding; the explicit statement of requiring sharing at the point of publication in the general guidance is new. However, this requirement aligns with federal sharing and Public Access requirements, as well as with many publisher requirements to make underlying data available at the time of publication of an associated paper (PLOS, Nature, Science, AGU etc).
To get help preparing data for sharing and finding an appropriate repository, contact data-help@cornell.edu.