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The production fraction of the $B_c^-$ meson with respect to the sum of $B^-$and $\bar{B}^0$ mesons is measured in both 7 and 13 TeV center-of-mass energy$pp$ collisions produced by the Large Hadron Collider (LHC), using the LHCbdetector. The rate, approximately 3.7 per mille, does not change with energy,but shows a transverse momentum dependence. The $B_c^- - B_c^+$ productionasymmetry is also measured, and is consistent with zero within the determinedstatistical and systematic uncertainties of a few percent.

Measurement of the $B_c^-$ meson production fraction and asymmetry in 7 and 13 TeV $pp$ collisions