The Mosaic Company filed a Form 8-K with the U.S. Securities and Exchange Commission on August 17, 2026, reporting the closing of a three-tranche senior notes offering totaling $2,000,000,000 in aggregate principal amount, with proceeds intended primarily to fund previously announced tender offers for existing debt.

Key Highlights

  • Three tranches closed: $1,000,000,000 of 5.350% senior notes due 2031, $500,000,000 of 5.650% senior notes due 2034, and $500,000,000 of 5.900% senior notes due 2036.
  • Net proceeds: The company expects to receive approximately $1,983.3 million after underwriting discounts and estimated offering expenses.
  • Primary use of proceeds: To fund tender offers for up to $1,400,000,000 aggregate purchase price of four series of existing notes and debentures.
  • Existing debt targeted: The tender offers cover the 4.050% Senior Notes due 2027, 7.300% Debentures due 2028 (issued by Mosaic Global Holdings, Inc.), 5.375% Senior Notes due 2028, and 4.350% Senior Notes due 2029.
  • Underwriting Agreement dated August 10, 2026: Representatives include Citigroup Global Markets Inc., BofA Securities, Inc., J.P. Morgan Securities LLC, and Wells Fargo Securities, LLC.
  • Registration: The offered securities were registered under a Form S-3 filed on November 7, 2025 (File No. 333-291349).

Mosaic's Senior Notes Closing and Debt Refinancing Plans

According to the filing, The Mosaic Company (NYSE:MOS) closed the sale of three series of senior notes on August 17, 2026. The largest tranche consists of $1,000,000,000 aggregate principal amount of 5.350% senior notes due 2031. The two smaller tranches each total $500,000,000 in aggregate principal amount, bearing interest at 5.650% due 2034 and 5.900% due 2036, respectively. The offered securities were issued pursuant to an Indenture dated October 24, 2011, between the company and U.S. Bank Trust Company, National Association, as trustee.

The company disclosed it expects net proceeds of approximately $1,983.3 million after deducting underwriting discounts and estimated offering expenses. According to the filing, the primary intended use of proceeds is to fund the purchase price for tender offers the company commenced on August 10, 2026, targeting up to $1,400,000,000 aggregate purchase price of existing debt. The existing debt subject to the tender offers includes: $700,000,000 of 4.050% Senior Notes due 2027, $147,100,000 of 7.300% Debentures due 2028 issued by Mosaic Global Holdings, Inc. (a wholly owned subsidiary), $400,000,000 of 5.375% Senior Notes due 2028, and $500,000,000 of 4.350% Senior Notes due 2029.

The filing also noted that remaining proceeds may be applied to general corporate purposes, which the company stated "may include the repayment, repurchase or refinancing of outstanding indebtedness from time to time." Pending such uses, the company may invest net proceeds in short-term investments, including cash, cash equivalents, and/or marketable securities. The filing was signed by Philip E. Bauer, Senior Vice President, General Counsel and Corporate Secretary, on August 17, 2026. The filing incorporates Item 2.03, Creation of a Direct Financial Obligation, by reference to Item 8.01.

What Was Disclosed

Mosaic reported the August 17, 2026 closing of a $2,000,000,000 three-tranche senior notes offering with expected net proceeds of approximately $1,983.3 million, to be used primarily for tender offers targeting four series of existing debt totaling up to $1,400,000,000, with remaining proceeds for general corporate purposes.