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Noncommutative multi-solitons are investigated in Euclidean two-dimensionalU(n) and Grassmannian sigma models, using the auxiliary Fock-space formalism.Their construction and moduli spaces are reviewed in some detail, unifyingabelian and nonabelian configurations. The analysis of linear perturbationsaround these backgrounds reveals an unstable mode for the U(n) models but showsstability for the Grassmannian case. For multi-solitons which are diagonal inthe Fock-space basis we explicitly evaluate the spectrum of the Hessian andidentify all zero modes. It is very suggestive but remains to be proven thatour results qualitatively extend to the entire multi-soliton moduli space.Comment: 1+33 pages, 5 eps figures; v2: references added, some notational  changes and minor correction

Sigma-Model Solitons in the Noncommutative Plane: Construction and Stability Analysis