"London-based Wellcome Trust says that it has withheld grant payments on 63 occasions in the past year because papers resulting from the funding were not open access. And the NIH, in Bethesda, Maryland, says that it has delayed some continuing grant awards since July 2013 because of non-compliance with open-access policies, although the agency does not know the exact numbers."

http://www.nature.com/news/funders-punish-open-access-dodgers-1.15007