T-Mobile US, Inc. 8-K

What Happened T-Mobile US, Inc. (TMUS) reported on March 31, 2026 (Form 8-K) that its wholly owned subsidiary T-Mobile USA, Inc. (TMUSA) elected to release the guarantees of certain subsidiaries under TMUSA’s $10 billion revolving credit agreement after previously repaying certain legacy indebtedness. The election triggered corresponding releases under the indentures governing TMUSA’s outstanding senior notes dated April 28, 2013; April 9, 2020; and September 15, 2022.

Key Details

• Date of filing / election: March 31, 2026.
• Revolving credit facility size: $10 billion (TMUSA’s revolving credit agreement).
• Remaining obligors/guarantors after release: TMUSA (issuer/borrower), and TMUS, Sprint LLC, Sprint Capital Corporation and Sprint Communications LLC (guarantors).
• Corresponding guarantor releases were also made under other TMUSA debt facilities, including export credit agency facilities and TMUSA’s unsecured short-term commercial paper program.

Why It Matters This action changes which legal entities guarantee certain T‑Mobile borrowings — reducing the set of subsidiary guarantors and simplifying the obligor structure for the $10B revolver and related senior notes. For investors, this clarifies which companies legally back these debts and may affect assessments of where credit risk and recourse lie within the corporate group. The filing is informational; it does not report new borrowing or repayment amounts beyond the previously noted repayment of legacy indebtedness. Investors who track T‑Mobile’s credit profile, covenants or recovery prospects should note the change and consult the underlying credit and indenture documents or rating agency commentary for any material impact.