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We present the data release of the Gemini-South GMOS spectroscopy in thefields of 11 galaxy groups at $0.8<z<1$, within the COSMOS field. This formsthe basis of the Galaxy Environment Evolution Collaboration 2 (GEEC2) projectto study galaxy evolution in haloes with $M\sim 10^{13}M_\odot$ across cosmictime. The final sample includes $162$ spectroscopically--confirmed members with$R<24.75$, and is $>50$ per cent complete for galaxies within the virialradius, and with stellar mass $M_{\rm star}>10^{10.3}M_\odot$. Includinggalaxies with photometric redshifts we have an effective sample size of $\sim400$ galaxies within the virial radii of these groups. We present groupvelocity dispersions, dynamical and stellar masses. Combining with the GCLASSsample of more massive clusters at the same redshift we find the total stellarmass is strongly correlated with the dynamical mass, with$\log{M_{200}}=1.20\left(\log{M_{\rm star}}-12\right)+14.07$. This stellarfraction of $~\sim 1$ per cent is lower than predicted by some halo occupationdistribution models, though the weak dependence on halo mass is in goodagreement. Most groups have an easily identifiable most massive galaxy (MMG)near the centre of the galaxy distribution, and we present the spectroscopicproperties and surface brightness fits to these galaxies. The total stellarmass distribution in the groups, excluding the MMG, compares well with an NFWprofile with concentration $4$, for galaxies beyond $\sim 0.2R_{200}$. This ismore concentrated than the number density distribution, demonstrating thatthere is some mass segregation.

The GEEC2 spectroscopic survey of Galaxy Groups at $0.8