Semileptonic and missing energy decays form a large part of the Belle II physics program from determinations of the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$ to measurements of observables that are sensitive to physics such as $R_{D^{*}}$ and $\mathcal{B}(B \rightarrow K^{*} \nu \bar{\nu})$. In these proceedings first reconstructions of semileptonic decays $B^{0} \rightarrow D^{*+} \ell \nu$ and $B \rightarrow X \ell \nu$ in 5.15 fb$^{-1}$ of Belle II data are presented with and without hadronic tag-side reconstruction.