Ad hoc disclosure (Ad-hoc-Mitteilung)
A mandatory notice in which a listed company immediately publishes price-sensitive news.
In short
As of 8 October 2026An ad hoc disclosure (German: Ad-hoc-Mitteilung) is a mandatory notice in which a listed company immediately publishes price-sensitive news, such as a profit warning or a takeover. It is based on Article 17 of the EU Market Abuse Regulation. This way all investors get the information at the same time. BaFin supervises compliance in Germany.
If a listed company learns something that could significantly move its share price, it must publish it without delay. This is set out in Article 17 of the EU Market Abuse Regulation (MAR). Typical triggers are a profit warning, a takeover, a capital increase or a change of CEO.
The point: all investors should get the information at the same time, so no one trades with an information edge. Anyone who knows in advance and trades on it commits insider trading. BaFin supervises the rules in Germany.
Example: a company cuts its full-year forecast in an evening ad hoc disclosure. The next morning the stock falls sharply. With such news a limit order helps, because prices can jump.
Related terms
Sources
As of 8 October 2026 · Educational content, not investment or tax advice.