It appears that it's exit season in Southern California, as Internet advertising firm Adconion appears to be on the brink of an IPO filing. A report this morning says that Adconion's paperwork is ready, and that the firm is poised to file its S-1 any day now. Adconion, although based in London, has significant operations in Los Angeles, and the firm's founding investors include Los Angeles investors Tyler Moebius (founder and CEO), Clark Landry (chairman of GraphEffect), Fred Krueger and Evan Rifkin. No details on the exchange or timing of the IPO have yet been filed by the company.