United States. ADT Inc. reported results for its first quarter of 2019. Total revenue was $1.243 billion, an increase of 11%, or $127 million year-over-year. Monitoring and related services revenue ("M&S revenue"), which comprised $1.07 billion of total revenue, increased 5%, or $53 million in the same period last year.
M&S revenue growth was primarily due to incremental revenue from acquisitions. The rest of the increase was due to an increase in recurring monthly revenue, which resulted from the addition of new customers and improvements in average prices, partially offset by customer attrition. In addition to M&S revenue, installation and other revenue increased by an additional $73 million year-over-year as a result of the successful execution of the Company's business growth strategy.
"We started our year with good progress in ADT, with strong revenue growth in the first quarter due to our commitment to the fundamentals of the business," said Jim DeVries, President and CEO of ADT. "Our commercial business continues to expand as we leverage the recent acquisition of Red Hawk, and our nationwide deployment of ADT Command and Control is strengthening our leadership position in home automation. We also successfully completed several improvements to our capital structure during and after the quarter, furthering our ability to target emerging opportunities from a position of strength, while returning capital to shareholders through our quarterly dividend and share repurchase program. Looking ahead, our talented team will remain focused on continuous improvement in key operational metrics, while investing to capitalize on "opportunities through home automation, commerce and DIY, all of which will drive our success and create long-term shareholder value."
The company reported a net loss of $66 million, compared to the previous year's net loss of $157 million. The decrease in net loss was primarily due to a decrease in loss on debt extinction as a result of partial repayments of the 9,250% of the second priority senior covered bonds maturing in 2023 ("Prime Notes") in February 2019 and a larger amount in February 2018. In addition, higher operating income, lower interest expense and higher income tax benefit all contributed to the improvement in net loss.
Adjusted EBITDA was $621 million, compared to $620 million in the first quarter of 2018, which included $17.5 million of favorable legal settlements. Adjusted EBITDA growth was driven by higher M&S revenue combined with higher transaction revenue in which security equipment is sold directly to customers, partially offset by associated costs, prior-year legal settlements and other increases in selling, general and administrative expenses, excluding items outside the Company's definition of Adjusted EBITDA.
