The legal action, led by Hagens Berman, centers on allegations that Fluence misled shareholders regarding its capacity to meet surging demand for data center energy storage. While the company touted its "fully automated" Houston production line for Gridstack Pro battery systems, the complaint claims management failed to disclose that the facility relied on incomplete infrastructure and manual welding processes rather than the promised automation.

Signs of trouble emerged in February 2026 when the company reported significant margin compression linked to project cost overruns. The situation deteriorated through the year, culminating in an August report of a $44.3 million quarterly net loss and a subsequent 20% slash to revenue guidance in September. CEO Julian Nebreda Marquez eventually attributed these failures to persistent delays in ramping up the Houston site. Reed Kathrein, the partner leading the investigation, is now probing exactly when leadership became aware of these manufacturing flaws while the firm invites affected investors and potential whistleblowers to come forward ahead of the November 27, 2026, lead plaintiff deadline.