8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): January 16, 2026

THE MOSAIC COMPANY

(Exact name of registrant as specified in its charter)

Registrant’s telephone number, including area code: (800) 918-8270

Not applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

All values are in US Dollars.

The following information is being “furnished” in accordance with General Instruction B.2. of Form 8-K and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed to be incorporated by reference in any filing under the Securities Act of 1933, as amended (the “Securities Act”), or the Exchange Act, except as expressly set forth by specific reference in such filing:

Furnished herewith as Exhibit 99.1 and incorporated by reference herein is the text of The Mosaic Company’s (“Mosaic,” and Mosaic and its subsidiaries, individually or in any combination, “we,” “us” or “our”) announcement regarding certain preliminary financial/operating results for the quarter and year ended December 31, 2025, as presented in a press release issued on January 16, 2026.

(d) Exhibits

Reference is made to the Exhibit Index hereto with respect to the exhibits furnished herewith. The following exhibits are being “furnished” in accordance with General Instruction B.2. of Form 8-K and shall not be deemed “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, nor shall they be deemed to be incorporated by reference in any filing under the Securities Act or the Exchange Act, except as expressly set forth by specific reference in such filing.

SIGNATURES

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 hereunto duly authorized.

Document

Exhibit 99.1

MOSAIC ISSUES MARKET UPDATE AND PRELIMINARY FOURTH QUARTER 2025 SALES RESULTS

Tampa, FL, January 16, 2026 – The Mosaic Company (NYSE: MOS) today provided an update on fertilizer markets and preliminary selected fourth quarter 2025 results.

North American fertilizer demand declined well beyond normal seasonal softness in the fourth quarter, as fall applications were weak due to sustained pressure on grower economics and were exacerbated by an early onset of winter weather that compressed the application window. The market conditions were particularly challenging for phosphates due to lower relative affordability as compared to potash. Overall North America phosphate market shipments are estimated to have been down approximately 20% in the fourth quarter compared to a year ago. North American potash demand was also negatively affected, though only modestly.

The challenging market environment significantly impacted Mosaic fourth quarter performance with phosphate sales volumes at approximately 1.3 million tonnes and potash sales volumes at approximately 2.2 million tonnes.

In the fourth quarter, to respond to weaker demand, Mosaic adjusted its phosphate production plan and product mix, and redirected products to markets with stronger demand, resulting in production volumes that remained consistent with the prior quarter.

Challenging market conditions also weighed on cash flow with fourth quarter results pressured by lower sales and the resulting inventory build.

Brazil’s fertilizer market deteriorated further in the fourth quarter, with intensifying credit constraints and heightened supplier competition, driven by an influx of lower-analysis phosphate products from China, which weighed heavily on demand and margins. As a result, Mosaic Fertilizantes’ sales volumes fell meaningfully short of expectations. Full year sales volumes were approximately 9 million tonnes—flat year over year, but reflective of the broader market downturn.

Despite the extraordinarily weak fourth quarter, 2026 is positioned to be more constructive. Growers are expected to replenish nutrients removed by last year’s strong crop, and additional government support payments are poised to stimulate demand for the North American spring application period. Phosphate markets are balanced to tight, a dynamic that is becoming more evident as spring demand accelerates, and as lower Chinese exports more acutely impact global markets, following that country’s announcement of broader and longer-duration phosphate export restrictions that are expected to be in place through at least the first half of the year. Prices have already responded positively to global demand since the start of the year. Potash markets are balanced, and China’s early contract settlement is expected to provide greater price stability and supports a positive outlook for Canpotex. Current industry expectations suggest that global phosphate and potash shipments could reach record levels in 2026. In Brazil, credit constraints persist but expanding planted acreage and strong crop yields are expected to support fertilizer demand in 2026 as growers rebuild soil nutrients, potentially setting another record for fertilizer demand in 2026. Importantly, the surge of low analysis phosphate imports from China does not appear likely to repeat itself given the export restrictions noted above.

Taken together, these factors suggest an improving outlook as the year progresses.

Fourth Quarter 2025 Earnings Release Webcast and Conference Call Information

The Mosaic Company (NYSE:MOS) plans to release full fourth quarter 2025 earnings results on Tuesday, February 24, 2026, after close of trading on the New York Stock Exchange. The company will issue a news wire alert when materials are publicly available on the company's website. On Wednesday, February 25, beginning 11:00 a.m. Eastern Time, the company will host a conference call to discuss the results.

Conference Call Details:

Dial-in number (Toll Free): +1 877-883-0383 International Dial-in number: +1-412-902-6506 Participant Elite Entry Number: 3126947

Link to Webcast of the Conference Call:

https://investors.mosaicco.com/events-and-presentations/default.aspx

A webcast of the conference call may be accessed through Mosaic's website at www.mosaicco.com/investors. An audio replay of the call will be available up to one year from the time of the earnings call.

About The Mosaic Company The Mosaic Company is one of the world's leading producers and marketers of concentrated phosphate and potash crop nutrients. Through its Mosaic Biosciences platform, the company is also advancing the next generation biological solutions to help farmers improve nutrient use efficiency and crop performance

sustainably. Mosaic provides a single-source supply of phosphate, potash, and biological products for the global agriculture industry. More information on the company is available at www.mosaicco.com.

Contacts:

This release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such statements may include, but are not limited to, statements regarding expected market conditions in 2026; anticipated demand for phosphate and potash; the impact of grower nutrient replenishment needs and government support programs; expected trends in Chinese fertilizer exports; anticipated pricing dynamics; expectations regarding Brazil’s credit environment, planted acreage and grower economics; and management’s expectations for 2026 fertilizer shipments and overall market recovery. Forward-looking statements are based on the views and assumptions of management as of the date of this release. They are subject to known and unknown risks, uncertainties, and other factors that may cause actual results to differ materially from those expressed or implied. These risks include, but are not limited to: changes in global supply and demand for crop nutrients; variations in farmer affordability, planted acreage or weather patterns; changes in international trade flows, including Chinese export policies; raw material cost volatility; geopolitical and macroeconomic developments; credit availability in key markets such as Brazil; and other risks and uncertainties described in The Mosaic Company’s reports filed with the Securities and Exchange Commission. Actual results may differ from those set forth in the forward-looking statements. The Mosaic Company assumes no obligation to update any forward-looking statements.