A High Close is a stock manipulation tactic in which small trades are made at high prices during the final minutes of trading. The use of a high close is especially popular in stocks with low liquidity and a high degree of information asymmetry. By artificially inflating the price of the stock, insiders can profit at the expense of unsuspecting investors.While a high close may seem like an unfair advantage for those in the know, it's important to remember that insider trading is illegal. If you're caught participating in this type of activity, you could face serious penalties, including jail time. So while a quick profit may be tempting, it's not worth risking your freedom for.