PHOS 6-K

UNITED STATES

SECURITIESAND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of August, 2026                               .

Commission File Number 001-43425

First Phosphate Corp.

(Translation of registrant’s name into English)

1055 West Georgia Street, 1500 Royal Centre, P.O. Box 11117, Vancouver, British Columbia, V6E 4N7

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

☐ Form 20-F           ☒ Form 40-F

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ___

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ___

SUBMITTEDHEREWITH

The following documents of the Registrant are submitted herewith:

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

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Exhibit 99.1

First Phosphate to Ring Nasdaq Opening Bell to Mark CompanyListing on the Nasdaq Global Market

Saguenay, Quebec – August 13, 2026– First Phosphate Corp. (“First Phosphate” or the “Company”) (NASDAQ: PHOS) (CSE: PHOS) (OTCQX: FRSPF) (FSE: KD0) is pleased to announce that its board and management team will be present at the Nasdaq Market Site (Times Square, New York) on Thursday, August 13, 2026, to ring the Nasdaq Opening Bell in celebration of the Company’s recent listing on the Nasdaq Global Market.

The ceremony recognizes the Company's journey from its founding to a recognized leader in the building and onshoring of a vertically integrated mine-to-market lithium iron phosphate (“LFP”) battery supply chain for North America.

“We are pleased to be able to offer accessibility in the shares of First Phosphate to investors around the world who wish exposure to rare North American igneous phosphate,” says John Passalacqua, CEO of First Phosphate. “It has been our goal since the outset to build Saguenay-Lac-St-Jean, Quebec into the mine-to-market LFP battery valley of North America.”

The Opening Bell ceremony will be broadcast live beginning at 9:15 a.m. ET on Thursday, August 13, 2026 on the Nasdaq website at https://www.nasdaq.com/marketsite/bell-ringing-ceremony.

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About First Phosphate Corp.

First Phosphate (NASDAQ: PHOS) (CSE: PHOS) (OTCQX: FRSPF) (FSE: KD0) is a mineral exploration and development and clean technology company dedicated to building and reshoring a vertically integrated mine-to-market supply chain for the production of LFP batteries in North America. Target markets include energy storage, data centers, robotics, mobility, and national security. First Phosphate’s flagship Bégin-Lamarche property, located in Saguenay–Lac-Saint-Jean, Québec, Canada, represents a rare North American igneous phosphate resource producing high-purity phosphate characterized by very low levels of impurities.

Media & Investor Contact:

Bennett Kurtz

Chief Financial Officer

Tel: +1 (416) 200-0657

Investor Relations: [email protected]

Media Relations: [email protected]

Website: www.FirstPhosphate.com

Follow First Phosphate:

X: https://x.com/FirstPhosphate

LinkedIn: https://www.linkedin.com/company/first-phosphate

Forward-LookingInformation and Cautionary Statements

This releaseincludes certain statements that may be deemed “forward-looking information”. Any statement that discusses predictions, expectations,beliefs, plans, projections, objectives, assumptions, future events or performance (often but not always using phrases such as “expects”,or “does not expect”, “is expected”, “anticipates” or “does not anticipate”, “plans”,“budget”, “scheduled”, “forecasts”, “estimates”, “believes” or “intends”or variations of such words and phrases or stating that certain actions, events or results “may” or “could”,“would”, “might” or “will” be taken to occur or be achieved) are not statements of historical factand may be forward-looking information. In particular, this press release contains forward-looking information relating to, among otherthings, the building and onshoring of a vertically integrated mine-to-market lithium iron phosphate battery supply chain for North Americaand the Company’s future contributions to such endeavour.

Although theCompany believes the expectations expressed in such forward-looking statements are based on reasonable assumptions, such statements arenot guarantees of future performance and actual results or developments may differ materially from those forward-looking statements.Factors that could cause actual results to differ materially from those in forward-looking statements include market prices, developmentand exploration successes, and continued availability of capital and financing and general economic, market or business conditions. Thesestatements are based on a number of assumptions including, among other things, assumptions regarding general business and economic conditionsthat engineering and construction timetables and capital costs for the Company’s, exploration, development and expansion projectsare correctly estimated and not affected by unforeseen circumstances; the ability to obtain financing for its proposed operations onacceptable terms; no material deterioration in general business and economic conditions; no material delays in obtaining permits andother approvals; no significant disruptions affecting the activities of the Company or its ability to access required project equipmentand services, and operating supplies in sufficient quantities and on a timely basis; inflation and prices for Company project inputsbeing approximately consistent with anticipated levels; the ability to complete the exploration and development programs consistent withthe Company’s expectations; commodity price expectations including assumptions for P2O5; the Company’s relationship withlocal municipalities and First Nations remaining consistent with the Company’s expectations; the Company’s relationship withother third-party partners and suppliers remaining consistent with the Company’s expectations; and government relations and actionsbeing consistent with Company expectations. Investors are cautioned that any such statements are not guarantees of future performanceand actual results or developments may differ materially from those projected in the forward-looking statements. Accordingly, readersshould not place undue reliance on the forward-looking information contained in this press release. The Company does not assume any obligationto update or revise its forward-looking statements, whether because of new information, future events or otherwise, except as requiredby applicable law. All forward-looking information contained in this release is qualified by these cautionary statements.

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