Results concerning the influence of Mo addition and thermal treatment on the Hall effect and magnetoresistance of Co
_{68.25-x}
Fe
_{4.5}
Si
_{12.25}
B
_{15}
Mo
_x
(x=1; 2) ribbons in the amorphous, nanocrystallized and crystallized states are reported. The value of the Hall resistivity of the samples increases continuously with applied magnetic field up to about 7 kOe and 13 kOe for Co
_{67.25}
Fe
_{4.5}
Si
_{12.25}
B
_{15}
Mo
_1
and Co
_{66.25}
Fe
_{4.5}
Si
_{12.25}
B
_{15}
Mo
_2
alloys, respectively and then it approaches saturation. For Co
_{67.25}
Fe
_{4.5}
Si
_{12.25}
B
_{15}
Mo
_1
ribbons the ferromagnetic anisotropic resistivity (FAR) values are 2.78 ×
10^{-4}
, 2.60 ×
106^{-4}
and 2.84 ×
10^{-4}
for amorphous, nanocrystalline and crystalline states, respectively. The FAR values of Co
_{66.25}
Fe
_{4.5}
Si
_{12.25}
B
_{15}
Mo
_2
ribbons are 1.35 ×
10^{-4}
, 1.78 ×
10^{-4}
and 18 ×
10^{-4}
for amorphous, nanocrystalline and crystalline states, respectively.
