Chitika on Tuesday announced a multiyear extension of its partnership with Yahoo, under which it syndicates Yahoo’s search listings across its ad network of 250,000 Web sites.

More recently, Chitika has expanded the relationship to include monetizing sponsored search results on select owned- and-operated properties on Yahoo and in mobile.

“Extending and expanding our relationship with Yahoo reaffirms our commitment to deliver innovative online and mobile ad technology solutions, which will help contribute to the growth of Yahoo!’s search marketplace,” stated Chitika CEO Venkat Kolluri.

Ramping up Yahoo’s mobile business has been a priority under CEO Marissa Mayer, especially as the site’s share of traffic coming from mobile continues to increase. During the company’s first-quarter conference call, she said Yahoo’s number of mobile users had grown to 300 million from 200 million last year.

Chitika, which has teamed with Yahoo since 2006, said it would work with the company to develop best practices to extend the reach of their text-based ads into mobile.

In addition to Yahoo, other Chitika ad partners include Superpages, yellowbook, ServiceMagic and Shopzilla.