IPG's first-quarter net revenue increased 2.8% at $2.03 billion compared to $1.97 billion in the first quarter of 2020. During the quarter, the organic net revenue increase was 1.9%, which comprised of a slight organic net revenue decrease of 0.2% in the US and an increase of 6.3% internationally. First-quarter 2021 total revenue, which includes billable expenses, was $2.26 billion, compared to $2.36 billion in 2020.
Operating income stood at $243.0 million, compared to $75.9 million in 2020. Adjusted EBITA before restructuring charges was $265.9 million in the first quarter of 2021, compared to adjusted EBITA of $97.2 million for the same period in 2020. Adjusted EBITA before restructuring charges margin on net revenue was 13.1%, compared to adjusted EBITA margin of 4.9% in 2020. Restructuring charges of $1.3 million consist of adjustments to the Company's restructuring actions taken during 2020; there were no new restructuring actions in 2021.
Johnson noted that IPG witnessed solid growth in media, data, and tech at FCB and at McCann Worldgroup. "At IPG DXTRA, the organic change in the quarter was negative 4.8%, which reflects the weight of live events and sports marketing within the segment, the disciplines that have been most significantly impacted by the pandemic. With that, DXTRA's performance was a sharp sequential improvement from the fourth quarter, especially in the public relations disciplines."
IPG earned 65% of its net revenue from the US while international markets contributed 35% to the overall revenue. "We grew in every international region, which is a notable improvement from Q4. Continental Europe grew 12.4%, with increases in every major national market, including Spain, Germany, Italy, and France, driven by increased spend from existing clients," Johnson said.