A corporate raid is a type of transaction where a person or group buys up a large amount of shares or ownership in a corporation. At this point the person completing the corporate raid will use the voting rights acquired from the raid to help with creating new measures for the business. These are measures used with the intention of working to improve the value of the shares. The most notable example of this is how Ronald Perelman used corporate raids for many takeovers in the 1980s including the acquisition of Revlon.