HERC's first-quarter 2016 revenues totaled $328 million, a decrease of 8% from the first quarter of 2015. Revenues were negatively affected by continuing weakness in upstream oil and gas markets and the sale of equipment rental operations in France and Spain in October 2015.
Excluding those factors, on a constant currency basis, revenues increased 12% primarily due to new account growth while pricing increased 1% in non-oil and gas markets. Revenue in upstream oil and gas markets represented approximately 18% of total revenues for the Worldwide Equipment Rental segment, on a constant currency basis, in the first quarter of 2016. Adjusted corporate EBITDA for the Worldwide Equipment Rental segment for the first quarter of 2016 was $122 million, a $10 million decrease versus the first quarter of 2015. Half of the adjusted corporate EBITDA decline is attributable to foreign exchange and the impact of the sale of operations in France and Spain. The remainder reflects declines in major upstream oil and gas markets.
The separation of HERC from Hertz Global remains on track for mid-2016, and the Company affirmed its Worldwide Equipment Rental segment full-year 2016 Adjusted Corporate EBITDA guidance between $600 million and $650 million.