Ricardo's revenue for the first six months ended 31 December 2014 was up 7.69% to GBP120.5m (US$185.9m) compared with GBP111.9m a year earlier.
Operating profit was up 2.15% to GBP9.5m compared with GBP9.3m. Profit before tax rose 2.27% to GBP9m from GBP8.8m. The company's profit for the period rose 2.78% to GBP7.4m from GBP7.2m in the year ago period.
CEO Dave Shemmans said: "The second half has started well with strong order intake leading to a record order book of GBP152m at the end of January. As we look to our second century, we remain confident of further progress in the full year."