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Private company

TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC

American natural gas transmission company based in Houston1

In its 2024 annual report the company says: “We are an interstate natural gas transmission company that owns and operates a natural gas pipeline system extending from Texas, Louisiana, Mississippi and the Gulf of Mexico through Alabama, Georgia, South Carolina, North Carolina, Virginia, Maryland, Delaware, Pennsylvania and New Jersey to the New York City metropolitan area. Our principal business is the interstate transportation of natural gas which is regulated by the FERC.”3

Last updated Oct 21, 2026.

Overview

  • IndustryNatural Gas Transmission1
  • HeadquartersHouston, Texas1
  • Incorporated inDE2
  • Business address2800 Post Oak Blvd, Po Box 1396, Houston, Tx 772512
  • Filer categoryNon-accelerated filer2

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Transco is indirectly owned by The Williams Companies, Inc. (Williams), a publicly traded Delaware corporation.3 From its latest annual report

Financials

From the company’s reports to the SEC. Every number links to the filing it came from.

Key numbers, fiscal 2023

49.2%Operating margin4
43.5%Net margin4
-1.5%Revenue growth, 20234
$821.1MFree cash flow4

Where the money goes

Where each dollar of revenue went, fiscal 2023

  • Other costs45¢$1.3B
  • Interest11¢$323.6M
  • Profit44¢$1.2B

Out of $2.9B in revenue.4

Where each dollar of operating cash went, fiscal 2023

  • Capital spending52¢$894.5M
  • Kept or used elsewhere48¢$821.1M

Out of $1.7B of cash from operations.4

Financial statements

Revenue5674$2.9B in 2023+1987% since 2017
0$1.0B$2.0B$3.0B2017: $137.3M$137.3M20172018: $136.7M$136.7M2018−0%2019: $147.7M$147.7M2019+8%2020: $162.0M$162.0M2020+10%2021: $167.8M$167.8M2021+4%2022: $2.9B$2.9B2022+1634%2023: $2.9B$2.9B2023−1%
Operating income56784$1.4B in 2023+817% since 2017
0$500.0M$1.0B$1.5B2017: $153.9M$153.9M20172018: $826.3M$826.3M2018+437%2019: $1.2B$1.2B2019+46%2020: $1.2B$1.2B2020−3%2021: $1.4B$1.4B2021+17%2022: $1.4B$1.4B2022+0%2023: $1.4B$1.4B2023+3%
Net income56784$1.2B in 2023+2138% since 2017
0$500.0M$1.0B$1.5B2017: $55.7M$55.7M20172018: $741.1M$741.1M2018+1230%2019: $963.3M$963.3M2019+30%2020: $880.0M$880.0M2020−9%2021: $1.1B$1.1B2021+21%2022: $1.1B$1.1B2022+3%2023: $1.2B$1.2B2023+13%
Fiscal year2017201820192020202120222023
Revenue$137.3M5$136.7M6$147.7M7$162.0M7$167.8M7$2.9B4$2.9B4
Cost of revenue$99.1M5$127.8M6$105.9M7$80.4M7$88.3M7
Operating expenses$1.3B4$1.5B4$1.5B4
Operating income$153.9M5$826.3M6$1.2B7$1.2B8$1.4B4$1.4B4$1.4B4
Interest$312.3M8$322.7M4$327.2M4$323.6M4
Net income$55.7M5$741.1M6$963.3M7$880.0M8$1.1B4$1.1B4$1.2B4

Compare TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC with another company

Corporate structure

TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC is part of a group headed by Williams Companies. 156 entities, 4 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

  • Williams Companies Tulsa, Oklahoma, United States
    • TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC Houston, Texas
    • Alliance Canada Marketing L.P. Subsidiary · Alberta, Canada
    • Appalachia Midstream Services, L.L.C. Subsidiary · Oklahoma, United States
    • Aurora Hydrogen Inc. Subsidiary · Alberta, Canada
    • Aux Sable Liquid Products Inc. Subsidiary · Delaware, United States
    • Aux Sable Midstream LLC Subsidiary · Delaware, United States
    • Bargath LLC Subsidiary · Delaware, United States
    • Baton Rouge Fractionators LLC Subsidiary · Delaware, United States
    • Baton Rouge Pipeline LLC Subsidiary · Delaware, United States
    • Black Marlin Pipeline LLC Subsidiary · Texas, United States
    • Blue Racer Midstream Holdings, LLC Subsidiary · Delaware, United States
    • Blue Racer Midstream Intermediate Holdings, LLC Subsidiary · Delaware, United States
    • Blue Racer Midstream, LLC Subsidiary · Delaware, United States
    • Bluebonnet Market Express LLC Subsidiary · Delaware, United States
    • Bluestem Gas Services, L.L.C. Subsidiary · Oklahoma, United States
    • Bluestem Pipeline LLC Subsidiary · Delaware, United States
    • BPEH-CXL Holdings LLC Subsidiary · Delaware, United States
    • Branch Midstream Company, LLC Subsidiary · Texas, United States
    • Brazos Permian II, LLC Subsidiary · Delaware, United States
    • Carbon County UCG, Inc. Subsidiary · Delaware, United States
    • Carbonate Trend Pipeline LLC Subsidiary · Delaware, United States
    • Cardinal Gas Services, L.L.C. Subsidiary · Delaware, United States
    • Cardinal Operating Company, LLC Subsidiary · Delaware, United States
    • Cardinal Pipeline Company, LLC Subsidiary · North Carolina, United States
    • Discovery Gas Transmission LLC Subsidiary · Delaware, United States
    • and 130 more

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries listed in Exhibit 21 of annual reports filed with the SEC. Each entity in the chart links to its source.

What it owns

What TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC reports owning in its annual reports to the SEC: buildings, land and equipment, real estate and locations, investments, intangible assets and inventory, at the end of its latest fiscal year and a year before.

Property and equipment

ItemLatestA year beforeChange
Property and equipment, before depreciation$19.3B4 Dec 31, 2023$18.2B4 Dec 31, 2022+5.8%
Accumulated depreciation$6.0B4 Dec 31, 2023$5.6B4 Dec 31, 2022+7.4%
Property and equipment, net$13.3B4 Dec 31, 2023$12.7B4 Dec 31, 2022+5.1%
Operating-lease assets (leased space)$53.3M4 Dec 31, 2023$59.2M4 Dec 31, 2022−10.1%

Intangibles and goodwill

ItemLatestA year beforeChange
Finite-lived intangibles, gross$1.5B4 Dec 31, 2023$1.5B8 Dec 31, 20220%
Finite-lived intangibles, net$400.0M4 Dec 31, 2023$400.0M8 Dec 31, 20220%

Properties, in its own words

Please read “Business” for a description of the location and general character of Williams’ principal physical properties. Williams generally owns its facilities in fee simple, although a substantial portion of our pipeline and gathering facilities is constructed and maintained pursuant to rights-of-way, easements, permits, licenses, or consents on and across properties owned by others.

Transco’s gas pipeline facilities are generally owned in fee simple. However, a substantial portion of such facilities is constructed and maintained pursuant to rights-of-way, easements, permits, licenses or consents on and across properties owned by others. Compressor stations, with appurtenant facilities, are located in whole or in part either on lands owned or on sites held under leases or permits issued or approved by public authorities. Transco’s storage facilities are either owned or contracted for under long-term leases or easements. Transco leases its company offices in Houston, Texas.

The rest of Item 2

NWP’s gas pipeline facilities are generally owned in fee simple. However, a substantial portion of such facilities are constructed and maintained on and across properties owned by others pursuant to rights-of-way, easements, permits, licenses or consents. NWP’s compressor stations, with associated facilities, are located in whole or in part upon lands owned by them and upon sites held under leases or permits issued or approved by public authorities. Land owned by others, but used by NWP under rights-of-way, easements, permits, leases, licenses, or consents, includes land owned by private parties, federal, state, and local governments, quasi-governmental agencies, or Native American tribes. The Plymouth LNG facility is located on lands owned in fee simple by NWP. Various credit arrangements restrict the sale or disposal of a major portion of our pipeline system. NWP leases its company offices in Salt Lake City, Utah.

Item 2 of the 10-K filed Feb 24, 2026.15

Former names

  • TRANSCONTINENTAL GAS PIPE LINE CORPMay 16, 1994 to Nov 6, 20082

Timeline

  1. Mar 9, 20268-K Regulation FD disclosure16
  2. Nov 6, 20258-K Other events17

Filings

21 filings to the SEC since October 2021: 3 annual reports, 10 quarterly reports, 2 major events, 6 other. The latest 20:

  1. Mar 9, 20268-K EDGAR
  2. Mar 9, 2026424B3 EDGAR
  3. Mar 6, 2026EFFECT EDGAR
  4. Mar 3, 2026CORRESP EDGAR
  5. Mar 3, 2026UPLOAD EDGAR
  6. Feb 24, 2026CORRESP EDGAR
  7. Feb 24, 2026S-4 EDGAR
  8. Nov 6, 20258-K EDGAR
  9. Nov 6, 202410-Q EDGAR
  10. Aug 5, 202410-Q EDGAR
  11. May 6, 202410-Q EDGAR
  12. Feb 21, 202410-K EDGAR
  13. Nov 1, 202310-Q EDGAR
  14. Aug 2, 202310-Q EDGAR
  15. May 3, 202310-Q EDGAR
  16. Feb 27, 202310-K EDGAR
  17. Oct 31, 202210-Q EDGAR
  18. Aug 1, 202210-Q EDGAR
  19. May 2, 202210-Q EDGAR
  20. Feb 28, 202210-K EDGAR

The 21 filings since October 2021 can be filtered by form type and year here when JavaScript is on.

Every filing from the last five years, summarized. The full record is on SEC EDGAR.

SEC filer profile

How TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC is registered with the Securities and Exchange Commission, from its EDGAR record and the cover page of its latest annual report.

  • Name on EDGARTRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC1
  • CIK0000099250
  • Employer ID (EIN)73-056987815
  • Filer statusLarge accelerated filer not an emerging growth company; not a smaller reporting company; not a shell company15
  • Incorporated inDelaware15
  • Fiscal year endsDecember 311
  • Industry code (SIC)4922 Natural Gas Transmission1
  • SEC reviewing officeOffice of Energy & Transportation, Division of Corporation Finance1
  • Business address2800 Post Oak Blvd, Po Box 1396, Houston, TX 772511
  • Phone71321520001
  • Shares outstanding1,221,563,111 shares as of Feb 19, 202615
  • Public float$67.7B as of Jun 30, 202515
  • AuditorErnst & Young LLP, Tulsa, Oklahoma PCAOB ID 42; it also attests to the company’s internal control over financial reporting15
  • On EDGAR sinceMar 31, 19941
  • Filings238 in all: 10-Q (98), 8-K (51), 10-K (30), CORRESP (11), S-4 (10), 424B3 (8), EFFECT (8), UPLOAD (6)1
    All 17 form types

    10-K405 (3), 424B2 (3), S-3 (2), S-3/A (2), S-4/A (2), 10-K/A (1), 10-Q/A (1), 424B5 (1), 8-K/A (1)

  • Latest filingsAnnual report (10-K) Feb 24, 2026
    Quarterly report (10-Q) Aug 3, 2026
    Latest 8-K (8-K) May 20, 2026

Securities registered for trading

ClassSymbolExchange
Common Stock, $1.00 par valueWMBNew York Stock Exchange

From the cover page of the 10-K filed Feb 24, 2026 (Section 12(b) of the Exchange Act).15

Risk factors and legal proceedings

The risks TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC names in Item 1A of its 10-K filed Feb 24, 2026: 36 risks under these headings, as written.15

  • Risks Related to Business
  • Risks Related to Financing
  • Risks Related to Regulations
  • General Risk Factors
  • The business, operating results, and financial condition of Williams’, Transco’s, and NWP’s natural gas transportation and midstream businesses are dependent on the continued availability of natural gas supplies in the supply basins and demand for those supplies in the markets that they serve.
  • Prices for natural gas, NGLs, oil, LNG, and other commodities are volatile, and this volatility has and could continue to adversely affect Williams’ financial condition, results of operations, cash flows, access to capital, and ability to maintain or grow its business.
  • Significant prolonged changes in natural gas prices could affect supply and demand for Transco and NWP and cause a reduction in or termination of their long-term transportation and storage contracts or throughput on their systems.
  • Williams, Transco, and NWP are exposed to the credit risk of customers and counterparties, and credit risk management will not be able to completely eliminate such risk.
  • Williams, Transco, and NWP may not be able to grow or effectively manage growth, including the pursuit and operational implementation of power innovation projects.
  • The energy industry is highly competitive, and increased competitive pressure could adversely affect Williams’, Transco’s, and NWP’s businesses and operating results.
  • Williams does not own 100 percent of the equity interests of certain subsidiaries, including the nonconsolidated entities, which may limit its ability to operate and control these subsidiaries. Certain operations, including the nonconsolidated entities, are conducted through arrangements that may limit Williams’ ability to operate and control these operations.
  • Williams, Transco, and NWP may not be able to replace, extend, or add additional customer contracts or contracted volumes on favorable terms, or at all, as applicable, which could affect Williams’, Transco’s, and NWP’s financial condition and ability to grow, as well as the amount of cash available to Williams to pay dividends.
The other 28 risks
  • Certain of Williams’, Transco’s, and NWP’s natural gas pipeline services are subject to long-term, fixed-price contracts that are not subject to adjustment, even if the cost to perform such services exceeds the revenues received from such contracts.
  • Some of Williams’, Transco’s, and NWP’s businesses are exposed to supplier concentration risks arising from dependence on a single or a limited number of suppliers.
  • Transco and NWP depend on certain key customers for a significant portion of their revenues. The loss of any of these key customers or the loss of any contracted volumes could result in a decline in Transco’s and NWP’s respective businesses.
  • Failure of service providers or disruptions to outsourcing relationships might negatively impact Williams’, Transco’s, and NWP’s ability to conduct their businesses.
  • An impairment of Williams’ assets, including property, plant, and equipment, intangible assets, and/or equity-method investments, could reduce Williams’ earnings.
  • Williams, Transco, and NWP may face opposition to the operation and expansion of pipelines and facilities from various individuals and groups or face increased scrutiny from various stakeholders with respect to environmental, social and governance practices.
  • Williams, Transco, and NWP may be subject to physical and financial risks associated with climate change.
  • Williams’, Transco’s, and NWP’s operations are subject to operational risks and hazards that might result in accidents and unforeseen interruptions.
  • Williams’, Transco’s, and NWP’s assets and operations, as well as their customers’ assets and operations, can be adversely affected by weather and other natural phenomena.
  • Williams’, Transco’s, and NWP’s businesses could be negatively impacted by acts of terrorism and related disruptions.
  • A breach of information technology infrastructure, including a breach caused by a cybersecurity attack on Williams, Transco, or NWP, or the third parties with whom they are interconnected, may interfere with the safe operation of assets, result in the disclosure of personal or proprietary information, and cause reputational harm.
  • If third-party pipelines and other facilities interconnected to Williams’, Transco’s, and NWP’s pipelines and facilities become unavailable to transport natural gas and NGLs or to treat natural gas, as applicable, Williams’, Transco’s, and NWP’s revenues could be adversely affected.
  • Williams’ operating results for certain components of its business might fluctuate on a seasonal basis.
  • Williams, Transco, and NWP do not own all of the land on which their pipelines and facilities are located, which could disrupt operations.
  • Williams’ business could be negatively impacted as a result of stockholder activism.
  • Williams’ costs and funding obligations for defined benefit pension plans and other postretirement benefit plans, and Transco’s and NWP’s allocations regarding the same, are affected by factors beyond Williams’ control.
  • A downgrade of Williams’, Transco’s, and NWP’s credit ratings, which are determined outside of their control by independent third parties, could impact their liquidity, access to capital, and costs of doing business, and the ability of Transco and NWP to obtain credit in the future could be affected by Williams’ credit ratings.
  • Difficult conditions in the global financial markets and the economy in general could negatively affect Williams’, Transco’s, and NWP’s businesses and results of operations.
  • Restrictions in Williams’, Transco’s, and NWP’s debt agreements and the amount of their indebtedness may affect their future financial and operating flexibility.
  • Changes to interest rates or increases in interest rates could adversely impact Williams’, Transco’s, and NWP’s access to credit, share price, and ability to issue securities or incur debt for acquisitions or other purposes, as applicable, and Williams’ ability to make cash dividends at intended levels.
  • Williams’ hedging activities might not be effective and could increase the volatility of Williams’ results.
  • Access to capital could be affected by financial institutions’ policies concerning fossil fuel related businesses.
  • Williams can exercise substantial control over Transco’s and NWP’s distribution policies, businesses, and operations and may do so in a manner that is adverse to Transco’s and NWP’s interests.
  • The operation of Williams’, Transco’s, and NWP’s businesses might be adversely affected by regulatory proceedings, including FERC proceedings; changes in government regulations or in their interpretation or implementation; or the introduction of new laws or regulations applicable to Williams’, Transco’s, and NWP’s businesses or customers.
  • Williams’, Transco’s, and NWP’s operations are subject to environmental laws and regulations, including laws and regulations relating to climate change and greenhouse gas emissions, which may expose them to significant costs, liabilities, and expenditures that could exceed expectations.
  • Williams, Transco, and NWP do not insure against all potential risks and losses and could be seriously harmed by unexpected liabilities or by the inability of their insurers to satisfy their claims.
  • Failure to attract and retain an appropriately qualified workforce could negatively impact Williams’, Transco’s, and NWP’s results of operations.
  • Holders of Williams’ common stock may not receive dividends in the amount expected or any dividends.

Legal proceedings

Environmental

Certain reportable legal proceedings involving governmental authorities under federal, state, and local laws regulating the discharge of materials into the environment are described below. While it is not possible for Williams to predict the final outcome of the proceedings that are still pending, it does not anticipate a material effect on its consolidated financial position if it received an unfavorable outcome in any one or more of such proceedings. Williams’ threshold for disclosing material environmental legal proceedings involving a governmental authority where potential monetary sanctions are involved is $1 million.

Other environmental matters called for by this Item are described under the caption “Environmental Matters” in Note 18 – Contingencies and Commitments included under Part II, Item 8. Financial Statements and Supplementary Data of this report, which information is incorporated by reference into this Item.

Other Litigation

The opening of Item 3, Legal Proceedings.15

Sources

The numbers on this page point here. Each one links to the record it came from.

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    SEC EDGAROther events