START researchers identified 109 jihadist-linked plots to use violence against the U.S. homeland January 1993 through February 2016. Of these, only 13 were completed and successful. The majority of the jihadist plots against the U.S. homeland were completely foiled (72%) and partially foiled (9%). These findings are interim.
Crenshaw, Martha, and Erik Dahl, Margaret Wilson. 2017. "Jihadist Plots in the United States." START College Park, Maryland. January.