secwatch.observer — SEC 8-K summary
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Issuer:     T-Mobile US, Inc. (TMUS)
CIK:        0001283699
Form:       8-K
Filed at:   2026-07-07T20:29:49+00:00
Accession:  0001193125-26-297534
Event type: leadership
Sentiment:  neutral
Materiality: 0.55
Item codes: 5.02, 7.01, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

T-Mobile appoints Chris Sambar as Chief Enterprise Officer; leadership team reshuffled
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- Chris Sambar appointed Chief Enterprise Officer (effective by Oct 14, 2026); previously COO at Public Storage, 20-year AT&T veteran.
- André Almeida promoted to Chief Marketing, Brand and Broadband Officer, overseeing consumer wireless and broadband.
- Dr. John Saw expands role to include product engineering and cybersecurity in addition to CTO duties.
- Mike Katz steps down as Chief Business and Product Officer effective July 8, 2026; remains strategic advisor through Dec 2026.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/1283699/000119312526297534/0001193125-26-297534-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/1283699/000119312526297534/d170112d8k.htm
  HTML page:      https://secwatch.observer/filing/0001193125-26-297534

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer