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He is a lime green colored eel with a light brown mustache and light green fins and legs. He wears a blue and purple suit, a magenta colored tie, and a monocle.
When Patrick is accidentally brought into Business Industries, Stockholder Eel quickly gets fed up with Patrick's antics and warns him that he will only give Patrick 18 chances to prove himself worthy of being a Business Industries executive. In the montage that follows, Patrick continues to goof off, annoying Stockholder more and more. Eventually, Stockholder decides to fire Patrick. In retaliation, Patrick reveals that he was not an executive, telling Stockholder he could not be fired due to this, only to have Stockholder arrest him for corporate espionage.
Stockholder Eel is the second humanoid eel seen in the entire series, the first being the unnamed eel from the episode, "Walking Small."