Online ad targeting firm x+1 has raised $2 million in a second round of funding, per an SEC filing. The NY-based company bundles behavioral targeting and ad analytics for marketers and media-buying agencies. It raised $16 million in a round led by Advanced Technology Ventures last year; we’ve put in a request for more info on the source of this new investment.

SEE ALSO: Online Analytics Marketer [x + 1] Raises $16 Million Funding | paidContent

X+1 brought in senior leadership from Aegis’ marketing analytics arm (including CEO John Nardone and VP of analytics Paul Davis) last year; the company said demand for its custom ad networks and targeting services drove a 90 percent revenue increase in Q109 vs. Q108.