--- title: "Natural Gas Utility 13Fs: Atmos Energy, Southwest Gas, Spire, NJR" type: learn slug: natural-gas-utility-13f-srce-decoder canonical_url: https://13finsight.com/learn/natural-gas-utility-13f-srce-decoder published_at: 2026-05-16T15:17:20.144Z updated_at: 2026-05-16T15:17:25.046Z author: Sarah Mitchell author_title: Education Editor author_url: https://13finsight.com/authors/sarah-mitchell word_count: 658 locale: en source: 13F Insight --- # Natural Gas Utility 13Fs: Atmos Energy, Southwest Gas, Spire, NJR > Atmos Energy, Southwest Gas Holdings, Spire, New Jersey Resources, plus Southern Company Gas (within SO) and Northwest Natural anchor US natural gas utility 13F positioning. Multi-year customer growth, rate base expansion, plus emerging emerging electrification dynamics drive distinctive institutional patterns. US natural gas utility equities form a distinctive regulated utility corner of institutional 13F positioning. Atmos Energy (ATO), Southwest Gas Holdings (SWX), Spire (SR), New Jersey Resources (NJR), Southern Company Gas (within SO), plus Northwest Natural Holding (NWN) anchor the cohort. Multi-year emerging customer growth, rate base expansion, plus emerging emerging electrification dynamics drive distinctive institutional positioning. Reading natural gas utility 13F positioning requires understanding the regulated rate base framework plus the multi-year regulatory dynamics.The natural gas utility business modelNatural gas utilities operate four primary economic engines:Rate base growth. Multi-year emerging rate base growth drives operator earnings. Multi-year emerging rate base (cumulative regulated capital investment) grew at 6-9% annually at most natural gas utilities driving multi-year EPS growth (4-7% range). Multi-year emerging rate cases plus emerging emerging trackers (cost-recovery mechanisms) plus emerging emerging multi-year rate plans drive rate base recovery.Customer growth. Multi-year emerging customer growth drives utility growth. Multi-year emerging Sun Belt customer growth (Texas, Arizona, Tennessee, Florida) drives Atmos Energy plus emerging emerging Southwest Gas plus emerging emerging Spire customer additions. Multi-year emerging emerging Northeast (NJR) plus emerging emerging Pacific Northwest (NWN) lower growth driven by mature markets plus emerging emerging electrification trends.Capital expenditure cycle. Multi-year emerging capital expenditure cycle drives multi-year emerging rate base growth. Multi-year emerging utility CAPEX driven by emerging emerging system modernization plus emerging emerging emerging pipeline replacement programs (cast iron, bare steel) plus emerging emerging emerging natural gas distribution expansion plus emerging emerging emerging renewable natural gas (RNG) plus emerging emerging hydrogen blending pilots.Electrification dynamics emerging. Multi-year emerging electrification dynamics drives utility risk. Multi-year emerging California natural gas ban (new construction) plus emerging emerging multi-state electrification policies plus emerging emerging Inflation Reduction Act heat pump incentives plus emerging emerging emerging utility decarbonization plans drive multi-year emerging emerging long-term natural gas utility uncertainty. Multi-year emerging emerging Sun Belt growth offsets emerging emerging coastal electrification.Major US natural gas utility namesAtmos Energy (ATO)Largest pure-play US natural gas utility plus emerging emerging Sun Belt customer growth (Texas, Louisiana, Mississippi, Tennessee) plus emerging emerging operational scaling plus emerging emerging dividend aristocrat (40-year dividend growth).Southwest Gas Holdings (SWX)Diversified Southwest Gas (Arizona, Nevada, California natural gas utility) plus emerging emerging Centuri (utility infrastructure construction, spinoff pending). Multi-year emerging operational scaling plus emerging emerging Carl Icahn activist pressure plus emerging emerging Centuri partial spinoff (April 2024 IPO) plus emerging emerging full separation pending.Spire (SR)Diversified Missouri plus emerging emerging Alabama plus emerging emerging Mississippi natural gas utility plus emerging emerging Spire Marketing plus emerging emerging Spire Storage. Multi-year emerging operational scaling plus emerging emerging dividend discipline.New Jersey Resources (NJR)Diversified New Jersey Natural Gas utility plus emerging emerging Clean Energy Ventures plus emerging emerging Energy Services plus emerging emerging emerging Midstream. Multi-year emerging operational scaling plus emerging emerging diversified subsidiary mix.Southern Company Gas (within SO)Southern Company subsidiary operating natural gas utilities in Georgia, Illinois, Tennessee, Virginia. Multi-year emerging operational scaling within Southern Company conglomerate.Northwest Natural Holding (NWN)Diversified Oregon plus Washington natural gas utility plus emerging emerging Northwest Natural Water (water utility subsidiary). Multi-year emerging operational scaling plus emerging emerging Pacific Northwest electrification pressure plus emerging emerging dividend aristocrat (68-year dividend growth).How institutional managers position around natural gas utilityThree patterns appear across smart-money 13Fs:Pattern 1: Sun-Belt-growth concentrationATO, SWX-concentrated growth manager positions reflect Sun Belt customer growth plus emerging emerging rate base expansion thesis.Pattern 2: Activist-positioningSWX-concentrated event-driven manager positions reflect Carl Icahn activist plus emerging Centuri separation thesis.Pattern 3: Dividend-income positioningATO, NWN-concentrated income-focused manager positions reflect dividend aristocrat thesis.How to read natural gas utility 13F positioningThree rules apply:Rule 1: Identify geographic exposureSun Belt vs Northeast vs Pacific Northwest have distinct dynamics.Rule 2: Watch rate case trajectoryMulti-year rate base recovery drives operator earnings.Rule 3: Cross-check electrification policiesMulti-year electrification drives long-term risk.What natural gas utility positioning signalsSun-Belt-growth conviction. Concentrated ATO positions signal Sun Belt growth thesis.Activist conviction. Concentrated SWX positions signal Icahn plus Centuri thesis.Dividend conviction. Concentrated NWN positions signal dividend aristocrat thesis.For real-time tracking of natural gas utility 13F activity, see the institutional signals feed. ## FAQ ### What are the major US natural gas utilities? Six major US natural gas utilities: (1) Atmos Energy (ATO) — largest pure-play, Sun Belt; (2) Southwest Gas Holdings (SWX) — Arizona, Nevada, California plus Centuri infrastructure; (3) Spire (SR) — Missouri plus Alabama plus Mississippi; (4) New Jersey Resources (NJR) — NJ Natural Gas plus Clean Energy Ventures; (5) Southern Company Gas (within SO) — Georgia, Illinois, Tennessee, Virginia; (6) Northwest Natural Holding (NWN) — Oregon plus Washington. ### How does natural gas utility rate base growth work? Multi-year rate base growth (cumulative regulated capital investment) drives operator earnings. Rate base grew at 6-9% annually at most natural gas utilities driving multi-year EPS growth (4-7% range). Multi-year rate cases plus trackers (cost-recovery mechanisms) plus multi-year rate plans drive rate base recovery. Multi-year allowed ROE typically 9.5-10.5% range. Reading rate case milestones drives institutional positioning. ### How does Sun Belt customer growth drive utilities? Multi-year Sun Belt customer growth drives Atmos Energy plus Southwest Gas plus Spire customer additions. Texas, Arizona, Tennessee, Florida demographic growth plus migration from Northeast/California drive multi-year customer additions (1-3% annually). Multi-year industrial growth plus emerging data center natural gas demand drive industrial customer growth. Reading customer growth trajectory drives positioning. ### How does electrification affect natural gas utilities? Multi-year electrification dynamics drive utility risk. California natural gas ban (new construction in some cities) plus multi-state electrification policies plus Inflation Reduction Act heat pump incentives plus utility decarbonization plans drive multi-year long-term natural gas utility uncertainty. Multi-year Sun Belt growth offsets coastal electrification. Reading electrification policy dynamics drives institutional positioning. ### What is Southwest Gas activist situation? Southwest Gas Holdings faces multi-year Carl Icahn activist campaign starting 2021 demanding board changes plus operational restructuring. Multi-year emerging Centuri (utility infrastructure construction subsidiary) partial spinoff completed April 2024 IPO plus emerging emerging full separation pending. Multi-year emerging operational refocus on natural gas utility plus emerging Centuri full separation drives institutional positioning. Reading separation milestones drives positioning. ### What signals natural gas utility cycle inflections? Four signals: (1) rate case outcomes plus emerging emerging rate base recovery; (2) customer growth plus emerging emerging Sun Belt dynamics; (3) electrification policy plus emerging emerging long-term demand; (4) capital expenditure plus emerging emerging operational scaling. Concentrated 13F changes around these signals reveal manager cycle reading. --- Source: 13F Insight — https://13finsight.com/learn/natural-gas-utility-13f-srce-decoder Author: Sarah Mitchell — https://13finsight.com/authors/sarah-mitchell Last updated: 2026-05-16T15:17:25.046Z