April 21 (Reuters) - Baker Hughes Co reported a 40% fall in first-quarter profit, compared to the fourth, as an unusually cold winter storm in parts of the United States in February hurt drilling activity and demand for oilfield equipment and services.

Adjusted operating income fell to $270 million in the three months ended March 31, from $462 million in the fourth quarter. (Reporting by Arathy S Nair in Bengaluru; Editing by Sriraj Kalluvila)