We present new results from our ongoing multiplicity study of exoplanet host stars , carried out with the infrared camera SofI at ESO-NTT . We have identified new low mass companions to the planet host stars HD 101930 and HD 65216 . HD 101930 AB is a wide binary systems composed of the planet host star HD 101930 A and its companion HD 101930 B which is a M0 to M1 dwarf with a mass of about 0.7 M _ { \odot } separated from the primary by \sim 73 arcsec ( 2200 AU projected separation ) . HD 65216 forms a hierarchical triple system , with a projected separation of 253 AU ( angular separation of about 7 arcsec ) between the planet host star HD 65216 A and its close binary companion HD 65216 BC , whose two components are separated by only \sim 0.17 arcsec ( 6 AU of projected separation ) . Two VLT-NACO images separated by 3 years confirm that this system is co-moving to the planet host star . The infrared photometry of HD 65216 B and C is consistent with a M7 to M8 ( 0.089 M _ { \odot } ) , and a L2 to L3 dwarf ( 0.078 M _ { \odot } ) , respectively , both close to the sub-stellar limit . An infrared spectrum with VLT-ISAAC of the pair HD 65216 BC , even though not resolved spatially , confirms this late spectral type . Furthermore , we present H- and K-band ISAAC infrared spectra of HD 16141 B , the recently detected co-moving companion of the planet host star HD 16141 A . The infrared spectroscopy as well as the apparent infrared photometry of HD 16141 B are both fully consistent with a M2 to M3 dwarf located at the distance of the planet host star .