The German defense industry is coming together: What the tank supplier's brilliant stock market debut means. Renk is valued at 1.75 billion euros at the first price.

The company is one of the most important suppliers to KNDS, one of Germany's most important arms suppliers. German fund companies are still shying away from defense stocks because of their strict ESG guidelines, a banker said. But Germany needs to invest more in defense, and skeptical German investors are now thinking more about it.