All proposals submitted to the National Science Foundation must describe plans for data management and sharing of the products of research or assert the absence of the need for such plans.
This should not be a new requirement for most of you as NIH has had this condition since 2003.
There are some distinctions between the two policies. NIH has a funding threshold before the policy is required or a particular FOA may require it to be included. NSF requires this regardless of the requested amount.
Not sure if it applies to you? See Kerri Cross.