Fluence Energy faces securities class action after $3 billion value loss

What the lawsuit alleges

The suit centers on Fluence's public assurances that it was "well positioned to capitalize on the accelerating demand for energy storage[,]" and that its backlog sufficiently covered revenue expectations. According to Hagens Berman, the company's plan depended on ramping up production of thermal management systems for its Gridstack ProTM battery energy storage solutions at a "fully automated" Houston manufacturing facility.

The complaint alleges that Fluence did not tell investors that its ability to deliver on its backlog and recognize revenue depended on new contract facilities, some of which were incomplete and non-operational. It also alleges the company did not disclose that remediation efforts at those facilities had been unsuccessful.

The claims are allegations made in a complaint and, as described by the law firm, have not been presented here as proven.

The disclosures that hit the share price

Hagens Berman says investors learned the alleged truth through partial disclosures, beginning on February 4, 2026. That day Fluence reported Q1 2026 results with a significant year-over-year margin compression, attributed to "additional estimated costs on two projects[]", and a significant year-over-year increase in net losses.

On August 5, 2026, the company reported Q3 2026 results with weaker than expected revenues and a large year-over-year margin compression. Net loss was $44.3 million, compared with net income of $6.2 million in the same quarter a year earlier. Fluence said it "now expects that $400 million in project deliveries will be delayed into fiscal 2027 due to production issues at a new international contract facility[]". It also blamed "construction related delays that affected the completion and start-up of a new U.S. contract manufacturing facility."

On September 16, 2026, Fluence cut its 2026 revenue guidance again, by 20%. CEO Julian Nebreda Marquez pointed to continuing "delays in the ramp up of our contract manufacturing facility in Houston." According to the release, he also revealed that the delay was caused by having to weld manually rather than use the automated welding process.

Each of these revelations triggered sharp declines in the share price, the firm says. Between February 4 and September 17, 2026, shares fell $21.33, or 73%.

Investigation, deadline and what investors can do

Hagens Berman says it continues to investigate claims that Fluence violated federal securities laws. Reed Kathrein, the partner leading the investigation, said: "We're focused on when the Houston welding issue was first known to Fluence management given the facility's crucial role in onshoring."

The lead plaintiff deadline is November 27, 2026. The firm urges Fluence investors who suffered substantial losses to submit them through its website, and invites people with non-public knowledge of the company to come forward. It also points to the SEC Whistleblower program, under which, according to the firm, whistleblowers who provide original information may receive rewards totaling up to 30 percent of any successful recovery made by the SEC.

For investors holding Fluence shares, the case shows how closely the Houston plant's ramp-up is tied to the company's revenue guidance and delivery schedule. The release is attorney advertising from the law firm, and it notes that prior results do not guarantee a similar outcome in any future case.