A knock-out option is a type of option with a built-in mechanism to expire worthless if a specified price level is reached.

A knock-in option is a type of latent option contract that starts to function only after a certain price is reached before expiration. 

Kiting is the fraudulent use of financial instrumentы to obtain additional credit that is not authorized.

Keynesian Put is the expectation that markets and economy will be supported by fiscal policy stimulus.

Key money is a payment to a landlord made by potential tenants as an attempt to secure the tenancy for the future.

The key rate is an interest rate that determines bank lending rates as well as the cost of credit for the borrowers of the bank.

K is a fifth letter that can be attached to NASDAQ stock symbol in order to note that the stock has no voting rights.

Kangaroos is a collective name given to Australian stocks which are a part of Australia’s All-Ordinaries Index.

Kill is a request to close the trade between the placement of order and its execution.

Kappa can tell traders and investors how much a security is going to change un price for a given period of time due to different changes even if the underlying price stays the same.

Kamikaze defense is a defense technique used by companies in order to avoid a takeover. It involves inflicting self-harm in order to make themselves look less attractive for a takeover. It is quite a desperate move, but quite effective.

Kickback is a bribing technique that is used to butter up the executives. A client gives an official a reward or percentage from the earnings as a thank you for a favorable behavior and good services. Considered illegal and has consequence.