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We present results from a set of high-fidelity simulated lightcones for theDESI One-Percent Survey, created from the Uchuu simulation. This 8 (Gpc/h)^3N-body simulation comprises 2.1 trillion particles and provides high-resolutiondark matter (sub)haloes in the framework of the Planck base-LCDM cosmology.Employing the subhalo abundance matching (SHAM) technique, we populate theUchuu (sub)haloes with all four DESI tracers (BGS, LRG, ELG and QSO) to z =2.1. Our method accounts for redshift evolution as well as the clusteringdependence on luminosity and stellar mass. The two-point clustering statisticsof the DESI One-Percent Survey align reasonably well with our predictions fromUchuu across scales ranging from 0.1 Mpc/h to 100 Mpc/h. Some discrepanciesarise due to cosmic variance, incompleteness in the massive end of the stellarmass function, and a simplified galaxy-halo connection model. We find that theUchuu BGS and LRG samples are adequately described using the standard5-parameter halo occupation distribution model, while the ELGs and QSOs showagreement with an adopted Gaussian distribution for central halos with a powerlaw for satellites. We observe a fair agreement in the large-scale biasmeasurements between data and mock samples, although the data exhibits smallerbias values, likely due to cosmic variance. The bias dependence on absolutemagnitude, stellar mass and redshift aligns with that of previous surveys.These results improve simulated lightcone construction from cosmological modelsand enhance our understanding of the galaxy-halo connection, with pivotalinsights from the first DESI data for the success of the final survey.

The DESI One-Percent Survey: Modelling the clustering and halo occupation of all four DESI tracers with Uchuu