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We present the results of a multi-epoch observational campaign on themini-broad absorption line quasar (mini-BAL QSO) PG 1126-041 performed withXMM-Newton from 2004 to 2009. Time-resolved X-ray spectroscopy and simultaneousUV and X-ray photometry were performed on the most complete set of observationsand on the deepest X-ray exposure of a mini-BAL QSO to date. Complex X-rayspectral variability, found on time scales of both months and hours, is bestreproduced by means of variable and massive ionized absorbers along the line ofsight. In the highest signal-to-noise observation, highly-ionized X-rayabsorbing material outflowing much faster than the UV absorbing one isdetected. This highly-ionized absorber is found to be variable on very shorttime scales of a few hours.

Variable X-ray absorption in the mini-broad absorption line quasar PG 1126-041