A new report from Nielsen/NetRatings gives further evidence of the boom in internet advertising.
The metrix firm found that the number of online advertising campaigns run during April increased by 35 per cent compared to the year before, from 5,673 to 7,641.
There were also 45 per cent more online advertisers active during the month - a total of 4,130.
Nielsen/NetRatings also found that nearly 16,300 campaigns were run during the first four months of this year, with the top 20 advertisers accounting for less than seven per cent. This clearly illustrates the rapidly growing importance of internet advertising to small businesses in the UK.
Of the biggest advertisers, it was Microsoft that was most prolific - the software giant ran 104 campaigns. Next were Hewlett Packard (75), O2 (67), Fidelity Investments (66), Dell (60), Orange (57), Sky (55), Amazon (55), HSBC (49) and IBM (47).
Other big hitters were Barclays, British Telecom, Halifax, British Airways, AOL and Nokia.
Nielsen/NetRatings analyst Alex Burmaster said: "Whilst it's not surprising to see technology and communications brands embracing online advertising, many will note how the finance sector - represented by brands such as HSBC, Barclays and Halifax - has an equally keen appetite for advertising on the web."
He continued: "What's also really interesting is that, unlike other areas of online, advertising isn't dominated by the few."
Source: Direct Traffic