The production fractions of $overline{B}_s^0$ and $Lambda_b^0$ hadrons, normalized to the sum of $B^-$ and $overline{B}^0$ fractions, are measured in 13 TeV pp collisions using data collected by the LHCb experiment, corresponding to an integrated luminosity of 1.67/fb. These ratios, averaged over the $b$-hadron transverse momenta from 4 to 25 GeV and pseudorapidity from 2 to 5, are $0.122 pm 0.006$ for $overline{B}_s^0$, and $0.259 pm 0.018$ for $Lambda_b^0$, where the uncertainties arise from both statistical and systematic sources. The $Lambda_b^0$ ratio depends strongly on transverse momentum, while the $overline{B}_s^0$ ratio shows a mild dependence. Neither ratio shows variations with pseudorapidity. The measurements are made using semileptonic decays to minimize theoretical uncertainties. In addition, the ratio of $D^+$ to $D^0$ mesons produced in the sum of $overline{B}^0$ and $B^-$ semileptonic decays is determined as $0.359pm0.006pm 0.009$, where the uncertainties are statistical and systematic.
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