ICON plc: ICON Reports First Quarter 2021 Results Highlights Record net business wins in the quarter of $1,100 million, an increase of 27% year on year; a net book to bill of 1.28. Record closing backlog of $10 billion, an increase of 14.0% year on year. Quarter 1 reported revenue of $858.2 million representing a year on year increase of 20.0% and 12.9% increase on Quarter 4 2020. Adjusted earnings per share* attributable to the Group for the quarter of $2.06, an increase of 21.0% over Quarter 1 2020. US GAAP income from operations amounted to $116.0 million or 13.5% of revenue. US GAAP net income attributable to the Group was $97.1 million or $1.82 per diluted share, compared to $1.62 per share for the equivalent prior year period.