BOGOTA, May 15 (Reuters) - Colombia's Grupo Argos first quarter net profit jumped to 3.8 trillion pesos, compared to 406 billion pesos in the year-ago period, the conglomerate said on Wednesday, citing in part huge gains from its Grupo Nutresa divestment.

It also pointed to gains from the combination of assets of its U.S. unit and Summit Materials.

Argos, with units in the energy, cement and airport operation sectors, saw revenues in the January-to-March period rise 21% to reach 4.5 trillion pesos. (Reporting by Nelson Bocanegra; Writing by Valentine Hilaire; Editing by David Alire Garcia)