Who owns Transco?
Transco is owned by Williams (the United States, NYSE: WMB).[1]
Evidence: The Williams Companies, Inc. Annual Report on Form 10-K filed 2026-02-24, SEC EDGAR, 24 February 2026. Verified from filings; last checked .
Key facts
- Current owner
- The Williams Companies, Inc. verified
- Owner HQ
- 🇺🇸 United States, Tulsa
- Origin
- 🇺🇸 United States
- Category
- Energy › Oil & gas › Pipelines & midstream
- Parent ticker
- NYSE: WMB
- Last verified
- · 1 sources
About Transco
Transco is the Transcontinental Gas Pipe Line Company, an interstate natural gas system of about 9,600 miles from Texas and the Gulf to the New York City area. Williams' 2025 10-K describes its principal business as FERC-regulated interstate gas transportation.
What Williams's annual report says about Transco
Sentences about Transco from Williams's latest annual filing[1], copied word for word.
Transco owns and operates an approximately 9,600-mile natural gas pipeline system extending from Texas, Louisiana, Mississippi and the Gulf of America through Alabama, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, Pennsylvania and New Jersey to the New York City metropolitan area.
Transco's principal business is the interstate transportation of natural gas, which is regulated by the FERC.
Transco also has storage capacity in an LNG storage facility that it owns and operates.
How often Williams names Transco in its annual report
A plain count of the times the name appears in the text of each annual report, not counting the start of a sentence. A brand that an owner writes about more is usually one it treats as central. The brand is named more often than it was three years earlier.
Ownership timeline of Transco
Where Transco sits in Williams
Controlling ownership as of . Brands grouped under the entity that owns them; large groups are collapsed.
Open the full Williams ownership tree →
See the full Williams brand portfolio (3) →
Other brands owned by Williams
Williams controls 3 brands on Brandtree, 3 of them in energy.
Also in energy
Other brands in pipelines & midstream, and who owns them
The 35 brands in pipelines & midstream on Brandtree belong to 21 owners. The largest is Energy Transfer, with 4; Williams has 3.
| Brand | Owner | Owner based in |
|---|---|---|
| Dakota Access Pipeline | Energy Transfer | 🇺🇸 United States |
| Dixie Pipeline | Enterprise Products | 🇺🇸 United States |
| Basin Pipeline | Plains All American | 🇺🇸 United States |
| Corpus Christi LNG | Cheniere | 🇺🇸 United States |
| Cenit | Ecopetrol | 🇨🇴 Colombia |
| Enbridge Mainline System | Enbridge | 🇨🇦 Canada |
| Columbia Pipeline Group | TC Energy | 🇨🇦 Canada |
| Aris Water Solutions | Western Midstream | 🇺🇸 United States |
About the owner: Williams
Williams is a publicly listed company headquartered in Tulsa, United States, founded in 1908. Brandtree records 3 brands under its control, and it is listed as NYSE: WMB.
Williams says in its 2025 Form 10-K that it was founded in 1908, is headquartered in Tulsa, Oklahoma, and owns an interest in and operates over 32,000 miles of pipelines. The filing describes Transco, Northwest Pipeline and MountainWest as its interstate natural gas transmission businesses, alongside gathering and processing and NGL operations.
🇺🇸 Transco and other American brands
Brandtree records a controlling owner for 2,399 brands that began in the United States. 461 of them (19%) are now controlled by a company headquartered in another country; Transco is not one of them.
- AES Ohio — AES 🇺🇸
- Agway Energy Services — Suburban Propane 🇺🇸
- Alabama Power — Southern Company 🇺🇸
- AmeriGas — UGI 🇺🇸
- American Transmission Company — WEC Energy Group 🇺🇸
- Arch Resources — Core Natural Resources 🇺🇸
Frequently asked questions
Who is the parent company of Transco?
The parent company of Transco is Williams, a publicly listed company headquartered in the United States.
Is Transco American?
Yes. Transco originated in the United States and its owner, Williams, is also headquartered in the United States.
Is Transco still owned by Williams?
Yes. As of 10 October 2026, Transco is still owned by Williams. The ownership record was last checked against primary sources on that date.
Sources (1) & corrections
Last verified . Every ownership fact above is backed by one of these primary documents. Numbers in brackets in the text refer to this list.
- [1] The Williams Companies, Inc. Annual Report on Form 10-K filed 2026-02-24 — SEC EDGAR, SEC Form 10-K, published 24 February 2026; retrieved 5 October 2026.
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