New York, May 28, 2026, 19:08 EDT
Brenmiller Energy Ltd. shares surged late Thursday, climbing 40 cents to $1.97. The stock was volatile, ranging from $1.55 to $2.48 through the session. By the close, the company, which trades on Nasdaq, carried a market cap around $4.4 million. About 378,829 shares changed hands.
The move took place after Nasdaq’s regular session, which goes from 9:30 a.m. to 4 p.m. Eastern. After-hours trading on Nasdaq is from 4 p.m. to 8 p.m. That’s when fewer buyers and sellers can lead to bigger price swings.
BNRG is thinly traded and small, and the most recent press release on the company’s news page was May 18, not Thursday. No new company news is showing up publicly, so the stock’s move looks like the market itself is repricing here, not a reaction to a new statement.
Market players got news to trade after a May 18 SEC filing showed Brenmiller named Nir Brenmiller as CEO. That’s pending shareholder approval for his new pay deal and for Avi Brenmiller, who stays chairman. The filing said Nir Brenmiller’s been deputy CEO since July 2012 and sits on the board.
Avi Brenmiller, in a May 18 statement, credited Nir with leading strategic and operational growth at the company “for more than a decade.” Nir Brenmiller said the firm was “expanding into integrated industrial energy solutions” with BNRG360. TMX Newsfile
Brenmiller makes thermal energy storage systems, or TES, which hold energy as heat and release it to supply steam, hot water, or process heat when factories need it. The company’s annual report states bGen technology stores heat in crushed rock at up to 1,400 degrees Fahrenheit, with thermal energy available on demand.
Brenmiller’s business is still at an early stage. In March, the company said it booked about $387,000 in 2025 revenue from its first TES system sale and is expecting roughly $1.7 million in 2026 revenue from project milestones with Tempo Beverages. “2025 was the year Brenmiller moved beyond proving the technology,” Avi Brenmiller said at the time. TMX Newsfile
Brenmiller investors are watching share-structure changes. In April, the company announced a 5-for-1 reverse share split to take effect after markets closed on April 14. Trading on a post-split basis started April 15, still using the BNRG ticker. The reverse split cuts the number of shares and pushes up the share price, but by itself doesn’t change total value.
Brenmiller filed a preliminary Form F-3 on May 6 for resale of up to 1,448,371 ordinary shares by a selling shareholder. The company’s filing shows it won’t get money from the sale of those shares, but it could see cash if April 2026 warrants are exercised.
Energy-storage stocks traded in different directions. Energy Vault dropped about 5%, ESS Tech gained around 3%, and Eos Energy added roughly 4% in the most recent quotes. BNRG’s jump was bigger, though that comparison is uneven with Brenmiller’s much lower market cap.
Nasdaq Composite jumped 0.91% to finish at a new high of 26,917.47. S&P 500 picked up 0.58%. Reuters said traders watched a reported U.S.-Iran ceasefire extension draft and digested new inflation numbers.
But the downside is clear. Brenmiller’s annual report flagged that BNRG360 could call for a lot more capital and make the company more exposed to outside funding. As of the report date, the annual filing said, no projects had gone forward with that model yet. In the same report, the company said it hadn’t seen meaningful revenue and may never reach profitability. If customers hold off or money gets tight, Thursday’s rally might not last.
