The goal of the Seed Accelerator Rankings Project (SARP), now in its fourth year, is to encourage a larger conversation and research about the seed accelerator phenomenon, its effects, and its prospects for the future. The last few years have seen the emergence of hundreds of groups titling themselves ‘accelerator.’ But not all such programs meet the definition of accelerator, and even for those that do, there are often significant differences in program structure and goals. For an entrepreneur considering an accelerator program, finding data regarding the performance of programs is difficult, and there is much confusion and debate regarding how ‘performance’ should be measured for an accelerator.