WIKI EXPLANATION OF A REVERSE TAKEOVER:
A reverse takeover (RTO), also known as a back door listing, or a reverse merger, is a financial transaction that results in a privately held company becoming a publicly held company without going the traditional route of filing a prospectus and undertaking an initial public offering (IPO). Rather, it is accomplished by the shareholders of the private company selling all of their shares in the private company to the public company in exchange for shares of the public company.
While the transaction is technically a takeover of the private company by the public company, it is called a reverse takeover because the public company involved is typically a "shell" (also known as a "blank check company", "capital pool company" or "cash shell company") and it typically issues such a large number of shares to acquire the private company that the former shareholders of the private company end up controlling the public company.