Results are presented of a search for new particles decaying to large numbers of jets in association with missing transverse momentum, using 4.7 fb -1 of pp collision data at √ s = 7 TeV collected by the ATLAS experiment at the Large Hadron Collider in 2011.The event selection requires missing transverse momentum, no isolated electrons or muons, and from ≥6 to ≥9 jets.No evidence is found for physics beyond the Standard Model.The results are interpreted in the context of a MSUGRA/CMSSM supersymmetric model, where, for large universal scalar mass m 0 , gluino masses smaller than 840 GeV are excluded at the 95% confidence level, extending previously published limits.Within a simplified model containing only a gluino octet and a neutralino, gluino masses smaller than 870 GeV are similarly excluded for neutralino masses below 100 GeV.