But he blocked the release of other files, citing national security concerns.
Senior administration officials did not divulge the contents of the records being shared by the National Archives on Thursday.
Conspiracy theories have swirled since President Kennedy was fatally shot in Dallas, Texas, 54 years ago.
A 1992 law passed by Congress required all records related to the assassination - around five million pages - to be publicly disclosed in full within 25 years.
The deadline was Thursday.
More than 90% of the files were already in the public domain.