Gaps result from extraordinary buying or selling interest developing while the market is closed. For example, if an earnings report with unexpectedly high earnings comes out after the market has closed for the day, a lot of buying interest will be generated overnight, resulting in an imbalance between supply and demand. When the market opens the next morning, the price of the stock rises in response to the increased demand from buyers. If the price of the stock remains above the previous day’s low throughout the day, then an up gap is formed.