Quid pro quo, a Latin term manning "something for something,". Used when two parties are engaged in a mutual agreement to exchange goods or services with one another.

Quarter over quarter is a measure of an investment volume or company's growth from one quarter to the next.

Quantity theory of money is a theory that suggests that changes in price relate to changes in money supply.

A quanto swap is a cross-currency, cash-set interest rate swap, where one of the parties pays a foreign interest rate of the other party. 

Icarus factor is a term used to describe a situation when the management of the company sets too ambitious plans which ultimately do not work out and harm the company in the end.

Quadrix is a stock valuation system that uses seven points - momentum, quality, value, financial strength, earnings estimates, performance, and volume metrics in over than 90 variables to determine a value of the stock.

QQQQ is an old name used for Nasdaq 100 Index. This index consists of 100 biggest and most commonly traded non-financial stocks of Nasdaq. The index is also known as QUADRUPLE Qs. The official symbol is QQQ Trust or QQQ.

QOQ or quarter to quarter is a technique that is used to measure the performance of the asset in the current quarter to the previous one or to the same quarter in a different year. The technique is useful for those who want to see a big picture in the growth of the companies and assets.

Quadrupule witching refers to fours certain dates in a year when stock index options, stock index futures, stock options and single stock futures expire. It happens at the same time for all four of the securities at the third Friday of March, June, September and December. Last hour of trading on these days see a horrific increase in the volume of trades.

The quote currency is the second currency listed in a forex pair. It is also known as the counter currency.