Robust estimators for Generalized Linear Models (GLMs) are not easy to develop because of the nature of the distributions involved. Recently, there has been an increasing interest in this topic, especially in the presence of a possibly large number of explanatory variables. Transformed M-estimators (MT) are a natural way to extend the methodology of M-estimators to the class of GLMs and to obtain robust methods. We introduce a penalized version of MT-estimators in order to deal with high-dimensional data. We prove, under appropriate assumptions, consistency and asymptotic normality of this new class of estimators. The theory is developed for redescending $\rho$-functions and Elastic Net penalization. An iterative re-weighted least squares algorithm is given, together with a procedure to initialize it. The latter is of particular importance, since the estimating equations might have multiple roots. We illustrate the performance of this new method for the Poisson family under several type of contaminations in a Monte Carlo experiment and in an example based on a real dataset.

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