The third quarter of 2020 revenues decreased to $116.6 million compared to $293.2 million in the third quarter of the prior year.
Operating loss for the third quarter was $31.8 million compared to an adjusted operating loss of $21 million in the third quarter of the prior year.
EBITDA for the third quarter was negative $12.3 million compared to adjusted EBITDA of $22.8 million in the same period of the prior year.
For the third quarter of 2020, RPC reported a $0.09 adjusted loss per share compared to an $0.08 adjusted loss per share in the third quarter of the prior year.
Cost of revenues during the third quarter was $100.9 million or 86.5% of revenues compared to $225.2 million or 76.8% of revenues during the third quarter of 2019.
Selling, general and administrative expenses decreased to $32.4 million in the third quarter of 2020 compared to $42.6 million in the third quarter of the prior year.
These expenses decreased due to lower employment costs, primarily the result of cost reduction initiatives during previous quarters, partially offset by $3.3 million of accelerated amortization of restricted stock related to the passing of our Chairman.
Depreciation and amortization decreased to $18.7 million in the third quarter of 2020 compared to $44.7 million in the third quarter of the prior year.
Our Technical Services segment revenues for the quarter decreased 60.2% compared to the same quarter in the prior year.
Segment operating loss in the third quarter of 2020 was $24.9 million compared to $18.2 million in the third quarter of the prior year.
Support Services segment revenues for the quarter decreased 61% compared to the same quarter in the prior year.
Segment operating loss in the third quarter of 2020 was $3.8 million compared to an operating profit of $1.6 million in the third quarter of the prior year.
On a sequential basis, RPC's third quarter revenues increased 30.6% to $116.6 million from $89.3 million in the prior quarter.
Cost of revenues during the third quarter of 2020 increased by $20.8 million or 26% due to expenses, which increased with higher activity levels such as materials and supplies, and maintenance expenses.
As a percentage of revenues, cost of revenues decreased from 89.6% in the second quarter of 2020 to 86.5% in the third quarter due to more efficient labor utilization and the leverage of higher revenues over direct costs, which are relatively fixed during the short term.
Selling, general and administrative expenses during the third quarter of 2020 increased 12.5% to $32.4 million from $28.8 million in the prior quarter, primarily due to the $3.3 million accelerated vesting of restricted stock.
RPC incurred an operating loss of $31.8 million during the third quarter of 2020 compared to an adjusted operating loss of $35.9 million in the prior quarter.
RPC's EBITDA was negative $12.3 million in the third quarter of 2020, compared to adjusted EBITDA of negative $17.8 million in the prior quarter.
Our Technical Services segment revenues increased by $28.7 million or 35.7% to $109.3 million in the third quarter due to increased activity levels in several service lines.
RPC's Technical Services segment incurred a $24.9 million operating loss in the current quarter compared to an operating loss of $34.1 million in the prior quarter.
Our Support Services segment revenues decreased by $1.5 million or 16.6% to $7.3 million in the third quarter.
Operating loss was $3.8 million compared to an operating loss of $1.8 million in the prior quarter.
At the end of the third quarter of 2020, RPC's pressure pumping capacity remained at approximately 728,000 hydraulic horsepower.
Third quarter 2020 capital expenditures were $13.7 million and we currently estimate the full-year capital expenditures to be approximately $60 million to $70 million and comprised primarily of capitalized maintenance of our existing equipment as well as upgrades of selected pressure pumping equipment for dual fuel capability.
At the end of third quarter, RPC's cash balance was $145.6 million and we remain debt free.

Summary:
The third quarter of 2020 revenues decreased to $116.6 million compared to $293.2 million in the third quarter of the prior year.
For the third quarter of 2020, RPC reported a $0.09 adjusted loss per share compared to an $0.08 adjusted loss per share in the third quarter of the prior year.