Losses before interest, taxation and other costs were £1.4m - considerably better than the £19.6m loss reported in the same period last year.
The division that sells Formula 1-derived technology and expertise, had a strong half-year.
Williams Advanced Engineering generated revenues of £10.9m, £3.1m higher than last year, with profits up £200,000 to £1m.
Chief executive Mike O'Driscoll said: "Our first-half results represent a significant improvement over the same period in 2014, with strong revenue growth and positive cash flow.
"The improved performance of our Formula One team on the track is now reflected in both higher commercial rights income and increased sponsorship revenue, bolstering our financial results."