The sector increased its share of the market from 24.7% in 2007 and made up £553.5m of the £1.682bn online ad market for the first half of 2008.
Automotive accounted for 13% of online spend, up slightly from 12.5% the previous year. The property sector accounted for significantly more online market share, up from 5.7% to 11.1%.
However, technology's share of online revenue fell back year-on-year, from 11.1% in 2007 to 9.4% in 2008.
Finance also saw a dramatic decline in share for the first half of 2008, falling to 6.2% from 11.7%.
In online display, technology was the category spending most, taking a 17.3% slice of the pie. Finance accounted for an 11.9% share, followed by entertainment and media with 10.7%, and recruitment with 9.9%.
|Top online sectors by market share||%|
|Top display categories by market share||%|
|Entertainment and media||10.7|