Salzgitter ist the second largest German metal company, specializing on pipes: from huge for natgas pipelines to finely polished for diesel engines.
Gas pipelines got a strong competitor: LNG tankers.
Diesel (esp. in Germany) is also in danger: e.g. they want to prohibit it in Stuttgart.
Still the stock grew intensively. But today it started to fall. And will likely continue.
Interestingly, that today the main news was a suspect of cartel agreement between leading German automotive companies. But Salzgitter stock fell with a delay, facilitating me a perfect timing to go short.