英文名称：Acting in Concert 中文名称：一致行动／合谋／共同行动
指投资者一起合作、一致行动以实现共同的投资目标。例如在股权分散的公司中，几个股权相对较大的投资者共同形成公司多数意见，以图影响公司经营管理决策。

A slang term for when parties undertake identical investment actions to achieve the same goal. Acting in concert requires the cooperation of people or corporations to make the same transactions based on a previous arrangement.

The issue of acting in concert is often examined in the world of acquisitions. Investors are usually required to declare any takeover intentions or place a tender offer after acquiring a specific percentage of shares in a company. However, some may try to spread the ownership percentage among friendly parties in an attempt to avoid declaring or bidding. Regulators have determined that if people are acting in concert and the sum of ownership exceeds the specified percentage, the group must declare its intentions.