Failure to Satisfy Listing Rule (Form 8-K)

As previously disclosed, On July 2, 2025, Aqua Metals, Inc. (the "Company") received a letter (the "Letter") from the Nasdaq Stock Market, LLC (the "Nasdaq") notifying the Company that it had fallen below compliance with respect to the continued listing standard set forth in Rule 5550(a)(2) of the Nasdaq Listing Rules because the closing bid price of the Company's common stock over the previous 30 consecutive trading-day period had fallen below $1.00 per share. The Letter stated that due to the fact that the Company has effected a reverse stock split over the prior one-year period, the Company was not eligible for any grace period under the Nasdaq Listing Rules in order to regain compliance with the minimum bid requirement and, consequently, the Company's securities would be delisted from the Nasdaq Capital Market unless the Company requests an appeal with the Nasdaq Hearing Panel.

Following the Company's one-for-ten reverse stock split effected on August 4, 2025 and the hearing of the Company's appeal to the Nasdaq Hearing Panel on August 19, 2025, the Company received a letter from the Nasdaq dated September 4, 2025 confirming the Company had regained compliance with minimum bid requirement in Listing Rule 5550(a)(2). The Company will be subject to a mandatory panel monitor for a period of one year ending September 4, 2026. If, within that one-year monitoring period, the Nasdaq staff finds the Company again out of compliance with the minimum bid requirement, the Company will not be eligible for any compliance grace period under the Nasdaq Listing Rules in order to regain compliance with Listing Rule 5550(a)(2), and, consequently, the Company would be subject to a delist determination from the Nasdaq Capital Market unless the Company requests an appeal with the Nasdaq Hearing Panel.