People familiar with the matter say Rheinmetall is the unnamed investor behind Rock Tech's recent capital increase, taking a minor stake in the German Canadian lithium developer and in its German smelter. They further indicated that Rheinmetall acts as the strategic co-investor for the planned converter in the city of Guben.
Earlier this month, Rock Tech announced a private placement of C$6 million (US$4.2 million) that features "a new strategic investor" who is also joining in equity participation tied to its Guben lithium hydroxide converter, which already has all permits in place. Representatives for Rheinmetall and Rock Tech said the companies would not comment.
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The move lines up with shifts in defense toward unmanned systems and higher end electronics, where batteries and lithium are central to national security. Lithium is increasingly treated as a critical input, as governments including the US push to reduce reliance on Chinese supply chains.
Rock Tech also entered into a non binding deal with Siemens Canada to develop the design for a lithium processing facility in Ontario. The bottom line: a defense contractor taking a stake, a co-investment at a permitted German converter, and engineering work in Canada together point to ongoing industrial demand for battery materials that could shape lithium supply narratives.
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