The poison pill is a defensive tactic used by listed companies to deter activist investors or acquirers from creating large blocks of shares or staging takeovers without the consent of the board of directors and without paying a premium to all shareholders.
Repackaging into private equity is when a private equity firm acquires all the shares of a ailing public company and modernizes the company in hopes of making it more profitable.
A reverse triangular merger is a new company that is formed when the acquiring company creates a subsidiary, that subsidiary buys the target company, and the target company then absorbs the subsidiary.