New research from Ongig posits that Workday Recruiting is the most used ATS of the Fortune 500, beating out Taleo by just a hair (22.6 percent vs. 22.4 respectively). In third place is SuccessFactors with 14.4 percent market share, followed by Kenexa BrassRing at 9.4 percent and iCIMS at 7.4 percent. Homegrown systems still retain 2.6 percent, with a 4.8 percent unknown factor. Thirty other ATS make up the remaining share with nominal percentages.