Platform-A, AOL's ad-selling arm, has transitioned its client ad campaigns from DoubleClick to AdTech.

AOL purchased AdTech two years ago, a move interpreted by some as a defense to Google's acquisition of DoubleClick — for which AOL has been a major ad-serving client for years.

As a point of conflict, however, Google powers AOL search — meaning the DoubleClick buy placed all AOL's ad operations directly under Google.

Following the account transfer, ads on AOL websites and ad networks will be delivered and reported in-house — a move expected to save millions of dollars per year in tech costs alone, according to the company. Trafficking efficiencies and campaign launch times for Platform-A are also expected to improve — as will reporting, which will be faster than DoubleClick's.

"It was a political purchase because AOL did not want to be 100 percent dependent on Google technologies," said Dirk Freytag, CEO/SVP of AdTech and Platform-A, respectively.

Founded in Frankfurt, Germany, AdTech boasts 65 websites and network partners within the States. Revenue gleaned from its clients rose 50% per year over the past three years.