Intel Capital, the corporate venturing unit of semiconductor company Intel, has led the $10m series B round for [x+1] as a new investor.
Lisa Lambert, a vice-president of Intel Capital, said: "[x+1] has set the standard for excellence in end-to-end digital media targeting technology.
"We are excited to work with [x+1] to accelerate the adoption of [its] media software services and to expand [its] international reach."
US-based digital marketing services company [x+1] said its previous venture capital firms, Advanced Technology Ventures, Blue Chip Venture Company and Hudson Venture Partners also participated in the B round.
The three VCs had invested $16m in May 2008.