This volume contains the papers presented at IWSPA-AP 2018: First Anti-Phishing Shared Pilot held on March 21, 2018 at the fourth ACM International Workshop on Security and Privacy Analytics (IWSPA), which was colocated with ACM CODASPY 2018 in Tempe, Arizona. The Pilot was organized after a great panel discussion at the First ACM IWSPA on the lack of common datasets and meaningful comparisons. Sixteen teams registered for IWSPA-AP 2018 and nine teams submitted models and predictions for evaluations. Each team that submitted materials for evaluation submitted a paper with details of their methods. Each submission was reviewed by at least 2 reviewers. The committee decided to accept 9 papers, some of them after signi cant revisions. This was the rst Anti-Phishing Pilot task. We hope that it will energize the security and privacy community to organize more such tasks in the future. Many thanks to all the external PC members and reviewers who reviewed papers on a tight schedule. Finally, we would like to thank the National Science Foundation and the Department of Defense (Army Research O ce), whose partial support made this pilot possible. Thanks also to EasyChair for helping us organize the submissions and the proceedings.