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⚠ The Merger Case Still in CourtLow threat

T-Mobile US (TMUS) — threat to the moat

A class of AT&T and Verizon customers is seeking trebled damages over the Sprint merger in Dale v. Deutsche Telekom.

The Sprint deal still carries a legal tail. In Dale v. Deutsche Telekom, filed in the Northern District of Illinois on 17 June 2022, a class of "AT&T and Verizon customers" is seeking "trebled monetary damages" over the merger1. The claim is that removing a fourth carrier raised prices even for people who never used T-Mobile.

Sprint merger: from agreement to litigation29 Apr 2018combination agreement,0.10256 ratio1 Apr 2020merger closes, $40.8bn17 Jun 2022Dale class action filed2023last $1,034Mof merger costsT-Mobile US Forms 10-K FY2020 and FY2023; Form 10-Q Q2 2026
The deal closed in 2020; the lawsuit did not.

T-Mobile has not recorded a loss for it, and the case may come to nothing. But it is a direct challenge to the source of the moat. If a court were to find the combination harmed competition, the remedy would bear on the market structure that lets three carriers hold their prices.

It is not the only suit the merger left. In Dinkevich v. Deutsche Telekom AG, filed in the Delaware Court of Chancery, shareholders assert breach of fiduciary duty over the repricing amendment to the Business Combination Agreement and SoftBank's monetisation of its shares2. Both cases test whether the merger was fair to someone other than its two largest owners.

The privacy record from the same years is still in court as well. On 29 April 2024 the FCC issued forfeiture orders against T-Mobile and Sprint over customer location data; the D.C. Circuit denied review on 15 August 2025 and rehearing on 23 January 2026, and T-Mobile intends to petition the Supreme Court3. Two companies that merged in 2020 are still answering separately for what each did before.

The financial exposure is unquantified in the filings. The measure of the risk is the docket rather than the accounts: a class certified and surviving summary judgment would put a price on what the merger did to the market, and the first number T-Mobile records for it would be the one to watch.

References
  1. ReportedIn Dale v. Deutsche Telekom, filed in the Northern District of Illinois on 17 June 2022, a class of "AT&T and Verizon customers" is seeking "trebled monetary damages" over the merger.
    T-Mobile US, Inc. Form 10-Q for the quarter ended 30 June 2026 - Deutsche Telekom ownership and voting control at 17 July 2026, the i3 Broadband and GoNetspeed/Greenlight fiber joint ventures, Auction 113, the Grain spectrum sale, litigation and cybersecurity risk. — Q2 2026 · publ. 23 July 2026 · source ↗
  2. ReportedIn Dinkevich v. Deutsche Telekom AG, filed in the Delaware Court of Chancery, shareholders assert breach of fiduciary duty over the repricing amendment to the Business Combination Agreement and SoftBank's monetisation of its shares.
    T-Mobile US, Inc. Form 10-Q for the quarter ended 30 June 2026 - Deutsche Telekom ownership and voting control at 17 July 2026, the i3 Broadband and GoNetspeed/Greenlight fiber joint ventures, Auction 113, the Grain spectrum sale, litigation and cybersecurity risk. — Q2 2026 · publ. 23 July 2026 · source ↗
  3. ReportedOn 29 April 2024 the FCC issued forfeiture orders against T-Mobile and Sprint over customer location data; the D.C. Circuit denied review on 15 August 2025 and rehearing on 23 January 2026, and T-Mobile intends to petition the Supreme Court.
    T-Mobile US, Inc. Form 10-Q for the quarter ended 30 June 2026 - Deutsche Telekom ownership and voting control at 17 July 2026, the i3 Broadband and GoNetspeed/Greenlight fiber joint ventures, Auction 113, the Grain spectrum sale, litigation and cybersecurity risk. — Q2 2026 · publ. 23 July 2026 · source ↗
Sources
Generated October 6, 2026