Anti-Sharing may improve the efficiency of teams. The Anti-Sharer collects a fixed payment from all team members; he receives the actual output and pays out its value to them. However, if a team members assumes the role of an "internal" Anti-Sharer, he will be unproductive in equilibrium. Hence, internal Anti-Sharing fails to yield the first-best outcome. External Anti-Sharing may induce the team members to choose efficient effort. The paper presents possible applications of Anti-Sharing: while internal Anti-Sharing may provide an explanation for the existence of senior (or managing) partners, external Anti-Sharing leads to a new theory of the incorporated firm.