“In the first quarter, we continued to execute on our key initiatives while focusing on our Path to 2020 objectives. Through continuous innovation, we are transforming our business in three major areas, Watch, Buy, and Operations, to drive a faster growing, higher margin business and create incremental value for our shareholders,” said Mitch Barns, Chief Executive Officer of Nielsen.
Net income for the first quarter of 2018 increased 1.4% to $72 million, compared to $71 million in the first quarter of 2017, as higher revenues were partially offset by our retailer investments and other growth initiatives. Net income was flat on a constant currency basis. Net income per share on a diluted basis was $0.20 per share for each of the first quarters ended 2018 and 2017.
Adjusted EBITDA for the first quarter of 2018 increased 0.7% to $423 million, compared to the first quarter of 2017. Adjusted EBITDA decreased by 0.7% on a constant currency basis. Adjusted EBITDA margins contracted 125 basis points to 26.3%, or 83 basis points on a constant currency basis, due to our retailer investments and other growth initiatives.