a corporate investor who intends to take over a company by buying a controlling interest in its stock and installing new management
"The activist raider bought millions of shares to force a board change at the struggling tech firm."
One who engages in a raid; a plunderer.
"The historical raider swept through the coastal villages to seize food and livestock before retreating into the hills."
In plain English: A raider is someone who attacks and steals from another place, usually by force.
"The video game players cheered when their team's raider finally scored in the final second."
The word raider is formed by adding the suffix "-er" to the noun raid. It was first used as a compound term to describe someone who participates in or carries out raids.