In the Ni47Mn42In11 and Ni43Со4Mn42In11 alloys, structural and magnetic phase transformations were studied by the magnetometry, dilatometry, and structural analysis. The temperatures of structural and magnetic transitions of the Ni43Со4Mn42In11 alloy have been determined. It has been shown that cobalt doping significantly increases the difference between the martensitic transformation temperature and Curie temperature. It has been found that in this alloy the martensitic transformation is accompanied by jumps in the temperature dependences of linear thermal expansion.