# EDGAR Filing Document

**Accession Number:** 0000099250
**File Stem:** 0001193125-26-098705
**Filing Date:** 2026-3
**Character Count:** 10765
**Document Hash:** 9048f9c419a6f09e79cecbfeb94fe036
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-26-098705.hdr.sgml**: 20260309

**ACCESSION NUMBER**: 0001193125-26-098705

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 15

**CONFORMED PERIOD OF REPORT**: 20260309

**ITEM INFORMATION**: Regulation FD Disclosure

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260309

**DATE AS OF CHANGE**: 20260309

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC
- **CENTRAL INDEX KEY:** 0000099250
- **STANDARD INDUSTRIAL CLASSIFICATION:** NATURAL GAS TRANSMISSION [4922]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 741079400
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-07584
- **FILM NUMBER:** 26735694

**BUSINESS ADDRESS:**
- **STREET 1:** 2800 POST OAK BLVD
- **STREET 2:** PO BOX 1396
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77251
- **BUSINESS PHONE:** 7132152000

**MAIL ADDRESS:**
- **STREET 1:** 2800 POST OAK BLVD
- **STREET 2:** PO BOX 1396
- **CITY:** HOUSTON
- **STATE:** TX
- **ZIP:** 77251

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** TRANSCONTINENTAL GAS PIPE LINE CORP
- **DATE OF NAME CHANGE:** 19920703

?xml version='1.0' encoding='ASCII'? 8-K

### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

### FORM 8-K

#### CURRENT REPORT

#### PURSUANT TO SECTION 13 OR 15 (d)

#### OF THE SECURITIES EXCHANGE ACT OF 1934

#### Date of report (Date of earliest event reported): March 9, 2026

## TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC

#### (Exact name of registrant as specified in its charter)

---

| | | |
|:---|:---|:---|
| **Delaware** | **001-7584** | **74-1079400** |
| **(State or Other Jurisdiction**<br> **of Incorporation)** | **(Commission**<br> **File Number)** | **(I.R.S. Employer**<br> **Identification No.)** |

---

---

| | |
|:---|:---|
| **2800 Post Oak Boulevard, Houston, Texas** | **77056** |
| **(Address of Principal Executive Offices)** | **(Zip Code)** |

---

(713) 215-2000

#### (Registrant's telephone number, including area code)

#### Not Applicable

#### (Former name or former address, if changed since last report)
Check the appropriate box below if the Form 8-K is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act: None

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (17 CFR 230.405) or Rule 12b-2 of the Securities Exchange Act of 1934 (17 CFR 240.12b-2).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

------

#### Item 7.01. Regulation FD Disclosure.
On March 9, 2026, Transcontinental Gas Pipe Line Company, LLC ("Transco") issued a press release announcing that it has commenced an offer to exchange any and all of its $1.0 billion in aggregate principal amount of outstanding 5.100 percent Senior Notes due 2036 (the "Original 2036 Notes") and $700 million in aggregate principal amount of outstanding 5.750 percent Senior Notes due 2056 (the "Original 2056 Notes" and, together with the Original 2036 Notes, the "Original Notes") for an equal amount of the applicable series of its registered 5.100 percent Senior Notes due 2036 (the "2036 Exchange Notes") and 5.750 percent Senior Notes due 2056 (the "2056 Exchange Notes" and, together with the 2036 Exchange Notes, the "Exchange Notes"). The exchange offer will expire at 5:00 p.m. Eastern Time on April 6, 2026, unless extended.

The terms of the Exchange Notes are identical in all material respects to those of the applicable series of the Original Notes, except that the Exchange Notes have been registered under the Securities Act of 1933, as amended, and the transfer restrictions, restrictive legends, registration rights and additional interest provisions relating to the Original Notes do not apply to the Exchange Notes. The purpose of the Exchange Offer is to fulfill Transco's obligations under the registration rights agreement entered into in connection with the issuance of the Original Notes. Transco will not receive any proceeds from the exchange offer.

In accordance with General Instruction B.2 of Form 8-K, the information furnished under this Item 7.01 on this Current Report on Form 8-K and Exhibit 99.1 attached hereto are deemed to be "furnished" and shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, nor shall such information be deemed incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act.

#### Item 9.01. Financial Statements and Exhibits
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(d) *Exhibits.*

---

| | |
|:---|:---|
| **Exhibit No.** | **Description** |
| 99.1 | [Press release dated March 9, 2026.](d121238dex991.htm) |
| 104 | Cover Page Interactive Data File. The cover page XBRL tags are embedded within the inline XBRL document (contained in Exhibit 101). |

---

------

#### SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

---

| | |
|:---|:---|
| TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC | TRANSCONTINENTAL GAS PIPE LINE COMPANY, LLC |
| By: | /s/ Robert E. Riley, Jr |
|  | Robert E. Riley, Jr. |
|  | Vice President and Assistant General Counsel – Corporate Secretary |

---

DATED: March 9, 2026

## Exhibit 99.1

**Exhibit 99.1** 

---

| | | |
|:---|:---|:---|
| ![LOGO](g121238g0306104834316.jpg) | Williams (NYSE: WMB)<br> One Williams Center<br> Tulsa, OK 74172<br> 800-Williams<br> www.williams.com | ![LOGO](g121238g0306104833364.jpg) |

---

**DATE:** March 9, 2026

**Williams' Transco Commences Registered Exchange Offer for its 5.100% Senior Notes Due 2036 and 5.750% Senior Notes Due 2056** 

TULSA, Okla. – Transcontinental Gas Pipe Line Company, LLC ("Transco"), a wholly owned subsidiary of The Williams Companies, Inc. ("Williams") (NYSE: WMB), announced today that it has commenced an offer to exchange any and all of its $1.0 billion in aggregate principal amount of outstanding 5.100 percent Senior Notes due 2036 (the "Original 2036 Notes") and $700 million in aggregate principal amount of outstanding 5.750 percent Senior Notes due 2056 (the "Original 2056 Notes" and, together with the Original 2036 Notes, the "Original Notes") for an equal amount of the applicable series of its registered 5.100 percent Senior Notes due 2036 (the "2036 Exchange Notes") and 5.750 percent Senior Notes due 2056 (the "2056 Exchange Notes" and, together with the 2036 Exchange Notes, the "Exchange Notes").

The terms of the Exchange Notes are identical in all material respects to those of the applicable series of the Original Notes, except that the Exchange Notes have been registered under the Securities Act of 1933, as amended, and the transfer restrictions, restrictive legends, registration rights and additional interest provisions relating to the Original Notes do not apply to the Exchange Notes. The purpose of the Exchange Offer is to fulfill Transco's obligations under the registration rights agreement entered into in connection with the issuance of the Original Notes. Transco will not receive any proceeds from the exchange offer.

The exchange offer will expire at 5:00 p.m. Eastern Time on April 6, 2026, unless extended (such date and time, as may be extended, the "Expiration Date"). The settlement date for the exchange offer will occur promptly following the Expiration Date. The terms of the exchange offer and other information relating to Transco and the Exchange Notes are set forth in a prospectus dated March 9, 2026, a copy of which has been filed with the Securities and Exchange Commission. Transco has not authorized any person to provide information other than as set forth in the prospectus.

Copies of the prospectus and the transmittal letter governing the exchange offer can be obtained from the exchange agent, The Bank of New York Mellon Trust Company, N.A., by calling (412) 236-4893, by writing via regular or certified mail, or overnight courier, to The Bank of New York Mellon, Attn: Corporate Trust Reorg — Sanela Sadikovic, 500 Ross Street, Suite 625, Pittsburgh, PA 15262, or by emailing ct_reorg_unit_inquiries@bny.com.

This press release is for informational purposes only and does not constitute an offer to sell nor a solicitation of an offer to buy any security. The exchange offer is being made solely pursuant to the prospectus dated March 9, 2026, including any supplements thereto, and only to such persons and in such jurisdictions as is permitted under applicable law.

**About Williams** 

Williams (NYSE: WMB) is a trusted energy industry leader committed to safely, reliably and responsibly meeting growing energy demand. Willaims uses its infrastructure to deliver one third of the nation's natural gas to where it's needed most, supplying the energy used to heat our homes, cook our food and generate low-carbon electricity. For over a century, Williams has been driven by a passion for doing things the right way. Today, Williams' team of problem solvers is leading the charge into the clean energy future.

*Portions of this document may constitute "forward-looking statements" as defined by federal law. Although Transco believes any such statements are based on reasonable assumptions, there is no assurance that actual outcomes will not be materially different. Additional information about issues that could lead to material changes in performance is contained in Transco's annual and quarterly reports filed with the Securities and Exchange Commission.* 

**MEDIA:** 

<u>media@williams.com</u> 

(800) 945-8723

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**INVESTOR CONTACTS:** 

Danilo Juvane

(918) 573-5075

Caroline Sardella

(918) 230-9992

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