<prompt> Human: So today Snap went public and did quite well valued at around 30 billion dollars. My question is how this affects the index funds we all know and love. Would Snap already be a part of the SP500, and all other indexes like VTI or is there a certain waiting period?  <response>: SP 500 has more criteria than largest 500. Its sort of an active index, as the SP committee can still kick a company out for failing some criteria. 