AGL Resources

Overview

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• TickerGAS on NYSE¹
• Industrynatural gas¹
• HeadquartersAtlanta¹
• Websitewww.aglresources.com
• Incorporated inGA⁶
• Business address725 W. Peachtree St. Ne, Atlanta, Ga 30308⁶
• Filer categoryLarge accelerated filer⁶
• Legal formProfit Corporation⁴
• LEI549300ZW53G2TUFW5T39⁴
• StatusActive⁴
• LEI statusIssued and current⁴
• Registered addressC/O Erin P. Harris, 30308 Atlanta, United States⁴
• Registered withGeorgia Secretary of State Corporations Division, K534333⁴

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Southern Company Gas, formerly AGL Resources, is an American Fortune 500 energy services holding company headquartered in Atlanta, Georgia. The company's operations consist of natural gas distribution, wholesale services, retail operations, and midstream operations. Southern Company Gas is one of the largest natural gas distribution companies in the United States. The company serves approximately 4.5 million utility customers through its regulated distribution subsidiaries across four states. Southern Company Gas made the Fortune 500 list in 2015, Forbes 2000 in 2006, and is a member of the S&P 500 Index. In 2016, Southern Company acquired AGL Resources and renamed it Southern Company Gas.³

Corporate structure

AGL Resources is part of a group headed by Southern Company. 30 entities, 1 country on record. Switch between the flow chart and the network, and select any entity to see its details.

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries, stakes and holdings from Wikidata (CC0). Each entity in the chart links to its source.

What it owns

What AGL Resources 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.

Properties, in its own words

At December 31, 2025, the traditional electric operating companies, Southern Power, and SEGCO owned and/or operated the generating and battery energy storage facilities listed in the table below. The traditional electric operating companies have certain jointly-owned generating stations. For these facilities, the nameplate capacity shown represents the Registrant's portion of total plant capacity, with ownership percentages provided if less than 100%. See "Jointly-Owned Facilities" and "Titles to Property" herein and Note 5 to the financial statements under "Joint Ownership Agreements" in Item 8 herein for additional information.

Barry Units 6 through 8 · Mobile, AL · 1,706,424

Item 2 of the 10-K filed Feb 19, 2026.¹²

Stakes and holdings (Wikidata)

• Nicor

Things Wikidata records the company as owning, with the share when stated.¹

Leadership

Who has led AGL Resources, and when. Pick a name to see everywhere that person has worked.

• Chief executive officerPaula Rosput Reynolds Jan 4, 2006 to Feb 14, 2006¹³
• Chief executive officerD. Raymond Riddle Feb 15, 2006 to Feb 15, 2006¹⁴
• Chief executive officerJohn W. Somerhalder Ii. Mar 6, 2006 to Jan 13, 2016¹⁵
• ChairJohn W. Somerhalder Ii. Feb 7, 2008 to Jan 13, 2016¹⁶
• ChairPaula Rosput Reynolds Jan 4, 2006 to Feb 14, 2006¹³
• ChairD. Raymond Riddle Feb 15, 2006 to Feb 15, 2006¹⁴
• PresidentPaula Rosput Reynolds Jan 4, 2006 to Feb 14, 2006¹³
• PresidentJohn W. Somerhalder Ii. Mar 6, 2006 to May 12, 2015¹⁵
• Chief financial officerElizabeth W. Reese May 13, 2015 to Jul 5, 2016¹⁷

Products and brands

From Wikipedia’s article on Southern Company Gas, shared under CC BY-SA 4.0.⁷

Subsidiaries and ownership

Also owns

• Nicor

Parent company (GLEIF)

• Southern Company⁴

From Wikidata.¹ Ownership links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); each one cites its LEI record.

Former names

• AGL RESOURCES INCApr 22, 1996 to Jul 11, 2016⁶

Timeline

1. Oct 15, 20268-K Other events⁴⁵
2. Sep 14, 20268-K Other events⁴⁶
3. Sep 8, 20268-K Other events⁴⁷
4. May 22, 20268-K Other events⁴⁸
5. Jan 9, 20268-K Other events⁴⁹
6. Nov 24, 20258-K Other events⁵⁰
7. Sep 8, 20258-K Other events⁵¹
8. Jan 3, 20258-K Other events⁵²
9. Sep 6, 20248-K Other events⁵³
10. Nov 20, 20238-K Other events⁵⁴
11. Sep 14, 20238-K Other events⁵⁵
12. Jun 21, 20238-K Other events⁵⁶
13. Jun 23, 2017Parent Directly consolidated by Southern Company⁴
14. Mar 6, 2006New chief executive John W. Somerhalder Ii. becomes CEO¹⁵
15. Feb 15, 2006New chief executive D. Raymond Riddle becomes CEO¹⁴
16. Jan 4, 2006New chief executive Paula Rosput Reynolds becomes CEO¹³
17. 1856Founded Founded¹

Filings

43 filings to the SEC since October 2021: 15 major events, 28 other. The latest 20:

1. Oct 15, 20268-K EDGAR
2. Sep 14, 20268-K EDGAR
3. Sep 10, 2026424B2 EDGAR
4. Sep 9, 2026FWP EDGAR
5. Sep 9, 2026424B5 EDGAR
6. Sep 8, 20268-K EDGAR
7. May 22, 20268-K EDGAR
8. May 21, 2026424B2 EDGAR
9. May 20, 2026FWP EDGAR
10. May 20, 2026424B5 EDGAR
11. May 8, 2026305B2 EDGAR
12. Jan 9, 20268-K EDGAR
13. Nov 24, 20258-K EDGAR
14. Sep 8, 20258-K EDGAR
15. Sep 5, 2025424B2 EDGAR
16. Sep 5, 2025424B2 EDGAR
17. Sep 3, 2025FWP EDGAR
18. Sep 3, 2025FWP EDGAR
19. Sep 3, 2025424B5 EDGAR
20. Sep 3, 2025424B5 EDGAR

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

SEC filer profile

How AGL Resources is registered with the Securities and Exchange Commission, from its EDGAR record and the cover page of its latest annual report.

• Name on EDGARSOUTHERN CO GAS²
• CIK0001004155
• Employer ID (EIN)58-0690070¹²
• Filer statusLarge accelerated filer not an emerging growth company; not a smaller reporting company; not a shell company¹²
• Incorporated inDelaware¹²
• Fiscal year endsDecember 31²
• Industry code (SIC)4924 Natural Gas Distribution²
• SEC reviewing officeOffice of Energy & Transportation, Division of Corporation Finance²
• Business address725 W. Peachtree St. Ne, Atlanta, GA 30308²
• Phone4045065000²
• Shares outstanding1,119,391,291 shares; 30,537,500 Alabama Power shares; 9,261,500 Georgia Power shares; 1,121,000 Mississippi Power shares; 1,000 Southern Power shares; 100 Southern Company Gas shares as of Jan 31, 2026¹²
• Public float$101.0B as of Jun 30, 2025¹²
• AuditorDeloitte & Touche LLP, Atlanta, Georgia PCAOB ID 34; it also attests to the company’s internal control over financial reporting¹²
• On EDGAR sinceMar 6, 1996²
• Filings2,338 in all: 4 (1,125), 8-K (390), 10-Q (92), 4/A (83), 425 (73), 424B5 (32), S-8 POS (30), 11-K (28)²
  All 70 form types

  35-CERT (28), 10-K (27), DEFA14A (27), 3 (24), 8-K/A (22), UPLOAD (22), 5 (21), SC 13G/A (21), DEF 14A (20), FWP (20), U-9C-3 (20), S-8 (19), U-1/A (19), U-12-IB (18), 424B2 (17), CORRESP (15), ARS (12), SC 13G (10), S-3 (9), S-3ASR (9), 424B3 (8), U-1 (8), S-3/A (7), 10-Q/A (6), U-13-60 (5), DFAN14A (4), PRE 14A (4), S-4/A (4), U-3A-2 (4), U5S (4), 10-K/A (3), 10-K405 (3), 3/A (3), 5/A (3), EFFECT (3), NO ACT (3), POS AMC (3), 25-NSE (2), 8-A12B (2), POSASR (2), S-4 (2), U-6B-2 (2), 11-K/A (1), 144 (1), 15-12B (1), 18-K (1), 305B2 (1), 424B1 (1), 424B4 (1), 8-A12B/A (1), CT ORDER (1), D (1), DEL AM (1), NT 11-K (1), PREM14A (1), RW (1), S-3DPOS (1), SE (1), U-3A-2/A (1), U-9C-3/A (1), U5A (1), U5B (1)

• Latest filingsAnnual report (10-K) Feb 19, 2026
  Quarterly report (10-Q) Jul 30, 2026
  Proxy statement (DEF 14A) Oct 13, 2015
  Latest 8-K (8-K) Oct 15, 2026

Securities registered for trading

From the cover page of the 10-K filed Feb 19, 2026 (Section 12(b) of the Exchange Act).¹²

Risk factors and legal proceedings

The risks AGL Resources names in Item 1A of its 10-K filed Feb 19, 2026: 29 risks under these headings, as written.¹²

• UTILITY REGULATORY, LEGISLATIVE, AND LITIGATION RISKS
• Southern Company and its subsidiaries are subject to substantial federal, state, and local governmental regulation, including with respect to rates. Compliance with current and future legal and regulatory requirements and procurement of necessary approvals, permits, and certificates may result in substantial costs to Southern Company and its subsidiaries. The reduction, elimination, or expiration of government incentives for, or regulations mandating or restricting the use of, renewable energy projects could reduce demand for renewable energy projects and harm the Registrants' businesses.
• The Southern Company system's costs of compliance with environmental laws and regulations and satisfying related AROs are significant.
• The Southern Company system may be exposed to regulatory and financial risks related to the impact of GHG legislation, regulation, and emission reduction goals.
• OPERATIONAL RISKS
• The financial performance of Southern Company and its subsidiaries may be adversely affected if the subsidiaries are unable to successfully operate their facilities or perform certain corporate functions.
• Operation of nuclear facilities involves inherent risks, including environmental, safety, health, regulatory, natural disasters, cyber intrusions, physical attacks, and financial risks, that could result in fines or the closure of the nuclear units owned by Alabama Power or Georgia Power and which may present potential exposures in excess of insurance coverage.
• Generation, transmission, and distribution of electricity and transportation and storage of natural gas involve risks that may result in accidents and other operating risks and costs and that may present potential exposures in excess of insurance coverage.
• Physical attacks, both threatened and actual, could impact the ability of the Subsidiary Registrants to operate.
• An information security incident, including a cybersecurity breach, or the failure of, or inability to remotely access, one or more key technology systems, networks, or processes could impact the ability of the Registrants to operate.
• The Southern Company system may not be able to obtain adequate natural gas, fuel supplies, and other resources required to operate the traditional electric operating companies' and Southern Power's electric generating plants or serve Southern Company Gas' natural gas customers.
• The revenues of Southern Company, the traditional electric operating companies, and Southern Power depend in part on sales under PPAs, the success of which depend on PPA counterparties performing their obligations, Southern Company subsidiaries satisfying minimum requirements under the PPAs, and renewal or replacement of the PPAs for the related generating capacity.

Legal proceedings

See Note 3 to the financial statements in Item 8 herein for descriptions of legal and administrative proceedings discussed therein. The Registrants' threshold for disclosing material environmental legal proceedings involving a governmental authority where potential monetary sanctions are involved is $1 million.

The opening of Item 3, Legal Proceedings.¹²

Links

• Websitewww.aglresources.com¹
• WikipediaSouthern Company Gas
• WikidataQ25796
• SEC EDGARCIK 1004155