Results from proton-lead and fixed-target collisions at LHCb

The latest results obtained by the LHCb collaboration from proton-lead andproton-gas fixed-target collisions are presented. Results related to charm andbeauty flavour hadron and quarkonia production in proton-lead collisions, beingclean probes for Cold Nuclear Matter effects, are compatible to predictionsbased on initial-state effects. Indications of significant final-state effectsin excited $\Upsilon(nS)$ resonances production are reported. The first cross-sectionmeasurement of $c\bar{c}$ and antiproton production in fixed-target proton-heliumcollisions at 100 GeV energy scale are also presented. More results will comefrom the latest Run 2 and future Run 3 data.