Stellar masses of our galaxies at z ∼ 5.2 compared to expectations from the simple relation that bounds the total stellar content of a dark matter halo to M_★ ≤ ϵ_★ f_b M_halo, where ϵ_★ (which should be ≤1) is the efficiency with which baryons are converted into stars and f_b is the cosmic baryonic fraction. We indicate the maximum stellar mass ($M_{★}^{\max }$) calculated from the maximum halo mass given our survey volume (160 arcmin², z = 5.2 ± 0.5) for ϵ_★ = 0.2 (dotted line) and ϵ_★ = 1 (dashed grey line). We also show $M_{★}^{\max }$ for ϵ_★ = 0.2 using the full sky area (dotted line).