A newly issued stock's price level performance after its IPO. The ending time period considered is not standardized, but after-market performance starts on first trading day on the exchange. The after-market performance is generally measured during the lock-up period, randomly between three to nine months right after its IPO date. This permits the market to "digest" the insider share which may be sold quickly right after the end of the lock up period. Analyst and investment banker can discover the overall market demand for new issues by viewing the after-market performance of all IPOs over a particular time period (as in a calendar year), and possibly make appropriate changes in the IPO schedule.