  The CUPID-Mo experiment at the Laboratoire Souterrain de Modane (France) is a
demonstrator for CUPID, the next-generation ton-scale cryogenic
$0\nu\beta\beta$ experiment. It consists of a 4.2 kg array of 20 enriched
Li$_{2}$$^{100}$MoO$_4$ scintillating bolometers to search for the lepton
number violating process of $0\nu\beta\beta$ decay in $^{100}$Mo. With more
than one year of operation (2.16 kg$\times$yr of physics data), no event in the
region of interest and hence no evidence for $0\nu\beta\beta$ is observed. We
report a new limit on the half-life of $0\nu\beta\beta$ decay in $^{100}$Mo of
$T_{1/2} > 1.5 \times 10^{24}\,$yr at 90 % C.I. The limit corresponds to an
effective Majorana neutrino mass $\langle m_{\beta\beta} \rangle$ $<$
(0.31--0.54)$\,$eV, dependent on the nuclear matrix element in the light
Majorana neutrino exchange interpretation.
