Failure to Satisfy Listing Rule - Form 8-K

On May 2, 2024, ClearSign Technologies Corporation (the "Company") received a letter (the "Notice") from the Listing Qualifications Staff (the "Staff") of The Nasdaq Stock Market LLC ("Nasdaq") indicating that, based upon the closing bid price of the Company's common stock for the last 30 consecutive business days beginning on March 20, 2024 and ending on May 1, 2024, the Company no longer meets the requirement to maintain a minimum bid price of $1 per share, as set forth in Nasdaq Listing Rule 5550(a)(2).

In accordance with Nasdaq Listing Rule 5810(c)(3)(A), the Company has been provided a period of 180 calendar days, or until October 29, 2024, in which to regain compliance. In order to regain compliance with the minimum bid price requirement, the closing bid price of the Company's common stock must be at least $1 per share for a minimum of ten consecutive business days during this 180 day period. In the event that the Company does not regain compliance within this 180 day period, the Company may be eligible to seek an additional compliance period of 180 calendar days if it meets the continued listing requirement for market value of publicly held shares and all other initial listing standards for Nasdaq, with the exception of the bid price requirement, and provides written notice to Nasdaq of its intent to cure the deficiency during this second compliance period, by effecting a reverse stock split, if necessary. However, if it appears to the Staff that the Company will not be able to cure the deficiency, or if the Company is not otherwise eligible, Nasdaq will provide notice to the Company that its common stock will be subject to delisting.

The Notice does not result in the immediate delisting of the Company's common stock from Nasdaq. The Company intends to monitor the closing bid price of the Company's common stock and consider its available options in the event that the closing bid price of the Company's common stock remains below $1 per share. There can be no assurance that the Company will be able to regain compliance with the minimum bid price requirement or maintain compliance with the other listing requirements.