ATMOS ENERGY CORP (ATO) stock intrinsic value fair value estimate & owner earnings analysis

Atmos Energy is a regulated natural gas utility: gas distribution in eight states (Texas is the largest, with Louisiana, Mississippi, Kentucky, Tennessee, Virginia, Kansas and Colorado) plus the Atmos Pipeline-Texas system. State regulators decide what it may earn on the pipe it has in service. Authorized returns on equity range from 9.3% in Colorado to 11.45% on the Texas pipeline, and authorized overall returns on its asset base run from roughly 7% to 8.5%. What the shares are worth therefore depends on how much it can keep investing in the system, how quickly regulators let it earn on that investment, and what return they allow. How we measured earnings. We looked at the cash the business generates after the spending needed to keep the existing system whole. We removed working-capital swings, most importantly Winter Storm Uri: roughly $2.0 billion of extreme gas costs paid in fiscal 2021 and recovered through securitized bonds in fiscal 2023, which distorts reported operating cash flow in both years. We treated spending equal to depreciation ($735 million in fiscal 2025) as upkeep, and the rest of capital spending ($2.8 billion of the $3.56 billion in fiscal 2025) as growth spending that earns a regulated return. We did this because gas revenue includes pass-through gas costs and does not signal how much pipe must be replaced. On this basis cash earnings per share rose from $5.21 in fiscal 2016 to $7.62 in fiscal 2025 (up 14.5% in 2025). Adding back interest paid gives the cash the business produces before its lenders: $7.24, $8.67 and $9.79 per share in fiscal 2023, 2024 and 2025. We started from the middle year, $8.67 (about $1.47 billion a year on 169.4 million shares), not the latest, and added the return on growth spending already made since then, about $5.3 billion on which we credit 6.5% (roughly $345 million). That puts the starting level near $1.8 billion a year, or $10.71 per share, 9.4% above fiscal 2025 versus 12.9% actual growth last year. Nine-month fiscal 2026 results support the level: net income $1.23 billion versus $1.02 billion, diluted earnings per share $7.33 versus $6.40, and capital spending $3.08 billion versus $2.60 billion. Operating cash flow over the nine months was flat ($1.67 billion versus $1.70 billion) despite 20% higher profit; we attribute this to working-capital timing and did not use it to move the level in either direction. The middle case assumes Atmos keeps investing about $4.0 billion a year for ten years, in line with this year's pace and below its own plan of roughly $26 billion for fiscal 2026 to 2030 (more than 80% of it safety and reliability work that regulators require). Capital spending has risen every year since fiscal 2014 ($0.82 billion then, $3.56 billion now), through the 2020 shutdown and Uri, funded each year by new debt and share issuance. That net spending of about $28 billion earns 6.5% a year after tax and before interest, starting a year after it is spent; this sits below the roughly 7% to 8.5% authorized returns, and regulatory mechanisms cut the lag to six months or less for a significant portion of spending. After year ten we credit no further growth and assume the earnings level simply continues, for as long as the system stays in service, but we remove the roughly $190 million a year of deferred-tax cash inflow that comes with heavy spending. We leave out customer growth, inflation, rate increases beyond what spending earns, and any margin expansion. In this case the business is worth about $30.2 billion ($178 per share) and owes about $9.0 billion net ($53 per share), leaving $125 per share. If Atmos made no further growth investments at all beyond those already paid for, the shares would still come to about $107. The downside case builds one full financing and regulatory downturn. Regulators cut returns to 9.3%, equal to the lowest return we found in its current rate orders (Colorado), costing about $107 million a year on its $15.3 billion of book equity; new spending earns only 6.0% and with a two-year lag instead of one; a credit squeeze like 2008 to 2010 forces $1.0 billion a year of share issuance for three years at 70% of value (a transfer of about $1.3 billion from existing holders); the $1.15 billion of notes maturing in 2027 to 2029 refinance at 7.5% (about $0.2 billion extra); and a Uri-type event leaves about $2.0 billion of gas costs carried for nearly two years, as happened between fiscal 2021 and fiscal 2023 (about $0.2 billion). Business value is $23.9 billion ($141 per share), debt $9.0 billion ($53), leaving $88 per share. We did not add gas demand erosion from electrification because its annual report does not mention electrification as a risk. The upside case assumes the $26 billion plan is delivered and extended: $5.5 billion a year for fifteen years earning 7.0%, in line with overall returns already authorized in Tennessee (7.63%) and Virginia (7.57%). Business value is $35.8 billion ($211 per share), debt $9.0 billion ($53), leaving $158 per share. Debt. At June 30, 2026 Atmos carried $10.33 billion of debt and $521 million of cash; we treated $200 million of cash as needed for operations. Much of the debt is long fixed-rate paper (for example $600 million at 1.50% to 2031, $500 million at 2.625% to 2029, and $600 million at 2.85% to 2052). Because those coupons are well below what new debt costs, it is worth about $1.0 billion less to repay than its face value, so net debt is taken as $9.0 billion. Near-term maturities are $500 million at 3.00% in June 2027, $150 million at 6.75% in July 2028 and $500 million at 2.625% in September 2029. At September 30, 2025 equity was 60.3% of capitalization and liquidity was $4.9 billion, including $3.1 billion of undrawn credit capacity and $1.56 billion of share issuance already contracted. In every case the existing system produces far more cash than the interest bill; growth spending is funded by new borrowing and share issuance, as it has been for years. What would make this wrong. Our largest assumptions are the return on new investment and how long regulators keep allowing it. Allowed returns falling further, or rate mechanisms being rolled back in Texas, would hurt most. The previous analysis of Atmos was built on a different basis and its figures are not comparable; the business itself has moved on, with net income up about 20% in fiscal 2026 so far and a five-year capital plan of about $26 billion. A roughly $130 million fiscal 2022 operating outflow could not be tied to a specific line item in the data we used; it is treated as working capital and does not affect the starting level. Margin-of-safety price. We are confident of the earnings level because rates are set by regulators, per-share cash earnings have risen in most years, and the cash-flow statements tie out to net income and the stated adjustments. The worst plausible outcome is a long squeeze in which regulators trim returns just as capital markets become expensive; the business would survive it because customers pay regulated rates, assets are hard and in service, equity funds about 60% of capitalization and credit lines are largely undrawn. We are most likely wrong about the return on new spending and about the endurance of the earnings level after year ten; if returns were trimmed to 9.3% and new spending earned only 6.0% with a two-year lag, but no financing squeeze or Uri-type event occurred, the shares would be worth about $96. The price assumes a holding period of about four years. Over that time Atmos pays a $4.00-a-share annual dividend (about $18 across four years if it keeps growing in the high single digits). If the middle case plays out, a share would be worth about $138 in four years, or about $156 including dividends; a 20% annual return over four years from that outcome requires a price no higher than about $75. If the downside case played out instead, the same price implies about 10% a year. The margin-of-safety price is $75.