Researchers at the National Institute of Standards and Technology (NIST) have measured the value of the Planck constant to be $\newcommand {\hres}{6.626\, 069\, 934 (89)} h=\hres\times 10^{-34}\, $ J s (relative standard uncertainty $\newcommand {\hrunc}{13}\hrunc\times 10^{-9} $). The result is based on over 10 000 weighings of masses with nominal values ranging from 0.5 kg to 2 kg with the Kibble balance NIST-4. The uncertainty has been reduced by more than twofold relative to a previous determination because of three factors:(1) a much larger data set than previously available, allowing a more realistic, and smaller, Type A evaluation;(2) a more comprehensive measurement of the back action of the weighing current on the magnet by weighing masses up to 2 kg, decreasing the uncertainty associated with magnet non-linearity;(3) a rigorous investigation of the dependence of the geometric factor on the coil velocity reducing the uncertainty assigned to time-dependent leakage of current in the coil.