T-Mobile US, Inc.

Company facts

Industry

Radiotelephone Communications

Headquarters

Bellevue, Washington

Most recent report

10-Q, filed Oct 28, 2026

Incorporated

Delaware

Filings on record

1,001+ filings

On EDGAR

CIK 1283699

Fiscal year ends

December

Filer status

Large accelerated filer

What to read: Sep 2026 10-Q

SECSift found 4 of 13 sections worth reading, with 1 positive, 18 notable, and 4 negative flags.

• Financial Statements (Item 1)

  Financial statements with notes: acquisitions, debt, restructuring, litigation, and stockholder returns.
  Notable

  • UScellular acquisition closed Aug 1, 2025: $2.8B cash + $1.7B debt assumed. Goodwill of $206M recorded.
  • Fiber JVs: $671M invested in i3 Broadband (closed Oct 1, 2026); ~$2.0B expected for GoNetspeed/Greenlight (close H1 2027).
  • Joint venture with AT&T and Verizon formed Sep 14, 2026 to pool spectrum and end wireless dead zones.
  • Comcast spectrum deal: $1.2B-$3.4B range. $46M paid for accelerated portion Jun 2, 2026. Remainder targeted H1 2028.
  • Spectrum sale to Grain closed Aug 10, 2026: $2.9B cash + $690M in 600 MHz licenses. Expects ~$850M tax due by 2027.
  • 2026 Stockholder Return Program increased to $18.2B on Apr 23, 2026. $5.4B remaining as of Sep 30, 2026.
  • Dividends: $3.3B paid in 9M 2026, of which $1.8B went to Deutsche Telekom. Q4 dividend raised to $1.17/share.
  • Share repurchases: 48.4M shares for $9.5B in 9M 2026. Average price $195.81. Post-quarter: 5M shares for $791M.
  • Pending litigation: FCC forfeiture orders paid under protest, petitions for review denied; Supreme Court cert petition pending.
  • August 2021 cyberattack: $350M class settlement paid; $150M spent on data security. Additional losses possible from regulatory inquiries.
  • Antitrust class action Dale v. DT, T-Mobile, SoftBank (Jun 2022) over Sprint Merger. Seeks trebled damages. Vigorously defended.
  • January 2023 cyberattack: data of ~37M accounts accessed. Consumer class actions dismissed; regulatory inquiries ongoing.
  • Shareholder derivative suits: Dinkevich (2021) and Palkon (2025) in Delaware Chancery Court. Outcomes uncertain.

• Management's Discussion (Item 2)

  Dense with acquisition integration, restructuring costs, and stockholder return details.
  Positive

  • Postpaid revenues up 9% to $16.3B in Q3 2026, driven by account growth and higher ARPA.
  Notable

  • Fiber JV investments: $4.6B for Metronet, $932M for Lumos, plus $671M for i3 Broadband post-quarter.
  • Total debt and financing lease liabilities $86.0B as of Sep 2026; $9.1B debt repaid YTD.
  • DT holds ~55.9% voting control of T-Mobile as of Oct 23, 2026, via proxy and lock-up agreement.

• Controls and Procedures (Item 4)

  ERP implementation may change internal controls; reader needs to track this risk.
  Notable

  • New ERP system implementation started in Q2 2025, phased over several years, may change internal controls.

• Risk Factors (Item 1A)

  New cyberattack risk factor with specific past incidents and evolving AI threats.
  Notable

  • Non-material incidents include unauthorized access to customer data and intellectual property.
  Negative

  • Insurance may not be sufficient to cover losses from cyber incidents or security breaches.
  • Third-party providers have experienced and will continue to experience cyberattacks affecting T-Mobile.
  • Significant costs from 2021 and 2023 cyberattacks: mass arbitration, class actions, FCC investigation.
  • AI tools may accelerate vulnerability exploitation, outpacing T-Mobile's ability to patch or mitigate.

What changed: Sep 2026 vs. Jun 2026

About 10% of TMUS's Sep 2026 10-Q is new information. 66 paragraphs were added, 236 changed, and 52 removed. Below are the most important lines SECSift identified.

• Item 2 161
• Item 1 90
• Item 6 3
• Item 5 1
• Item 3 1