Rheinmetall takes stake in Rock Tech Lithium and Guben plant

Rheinmetall has reportedly taken a stake in Rock Tech Lithium and in its Guben lithium hydroxide converter in Germany, as the investor in a 6 million Canadian dollar private placement Rock Tech announced earlier in October.

Why it matters: A German defence group investing directly in a permitted lithium converter is a further sign of defence demand reaching into critical minerals processing, though the size of the stake was not disclosed.

Data as of Investing.com report published October 16, 2026, sourced to a Bloomberg report. Developing item, single sourced, and the report disclosed no stake percentage, share price or plant capacity figure.

Rheinmetall, the German defence company, has reportedly acquired a stake in Rock Tech Lithium and in its German converter facility at Guben, Investing.com reported, citing a Bloomberg report. Rheinmetall is the new strategic investor in the 6 million Canadian dollar (4.2 million US dollars) private placement Rock Tech announced earlier this month, which also included an equity position in the Guben lithium hydroxide converter, a project the report said has received full permits.

No percentage stake, separate Rheinmetall amount or converter capacity was disclosed in the report. Rock Tech shares were shown up 15.25 percent and Rheinmetall shares up 6.26 percent in the market data accompanying the report.

Rheinmetall takes stake in Rock Tech Lithium and Guben plant

Sources