Every 424B that ClearSign Technologies Corporation (CLIR) has filed with the SEC in the last 12 months is listed below, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A 424B covers the supplement that carries the terms of a priced offering, so if you follow CLIR and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full CLIR filings page.
ClearSign Technologies Corporation is registering an at-the-market offering to sell up to $6,875,000 of its common stock under an existing sales agreement with H.C. Wainwright & Co., LLC. The offering is conducted pursuant to a prospectus supplement dated July 6, 2026 and the related Form S-3 shelf.
The sales may occur from time to time on Nasdaq or other U.S. trading venues, directly to market makers or to the sales agent as principal, at prevailing market prices. The company discloses a public float of $32,247,890 (based on 6,195,560 shares at $5.205 per share as of May 14, 2026) and states it will not sell in any 12-month period shares exceeding one-third of that public float while the public float remains under $75,000,000. Prior ATM activity during the last 12-calendar months totaled 894,447 shares for aggregate gross proceeds of $3,872,956. Proceeds are intended for working capital, R&D, marketing and general corporate purposes.
ClearSign Technologies is offering 777,780 shares of its common stock at a public offering price of $4.33 per share under a prospectus supplement to its Form S-3. The company granted the underwriter a 30-day option to purchase up to an additional 116,667 shares.
The prospectus states proceeds to ClearSign, before expenses, of $3,165,720.16 and estimates net proceeds of approximately $2,941,686. Shares outstanding are shown as 5,412,633 before the offering and 6,190,413 after giving effect to the sale. The offering is subject to a 90-day lock-up for officers and directors and customary closing conditions.
ClearSign Technologies Corporation filed a preliminary prospectus supplement under its effective Form S-3 shelf to offer shares of its common stock.
The supplement describes offering mechanics (price, underwriting discounts, and an underwriter over-allotment option) but leaves specific offering quantities and pricing blank in the excerpt. It discloses a 1-for-10 reverse stock split effective March 16, 2026, reports 5,412,633 shares outstanding as of May 28, 2026, a public float calculation of $36,786,497 based on 5,300,648 shares at $6.94 per share (April 6, 2026), notes suspension of its ATM program on May 26, 2026, and records a purchase order for an M1 Series burner expected for delivery in Q3 2026. The prospectus supplement states proceeds will be used for working capital, R&D, marketing and general corporate purposes.