The term “ad hoc communication” comes from Latin. “Ad hoc” literally means “for this purpose” or “for this particular occasion”. In this context, “ad hoc” refers to the fact that the announcement is prepared and published specifically and exclusively for a particular circumstance that has suddenly arisen.
In finance, the term has been adopted to describe the way in which listed companies are required to immediately disclose important information that may significantly affect the share price. These announcements are not scheduled or regular, but are made spontaneously and on an as-needed basis, precisely when relevant events or developments occur that are of importance to investors and other market participants.
The use of the term emphasizes the urgency and specificity of the information, which must be communicated promptly and precisely in order to ensure transparency and fairness on the financial markets.