ATI INC (ATI) stock intrinsic value fair value estimate & owner earnings analysis

ATI Inc. is a Pittsburgh-based specialty metals manufacturer that makes titanium and titanium alloys, nickel-based superalloys, and other high-performance materials used mainly in jet engines and airframes for commercial aircraft, defense platforms, and industrial and medical applications. In February 2020 the company sold its commodity stainless-steel Flat-Rolled Products business, refocusing entirely on two specialty segments: High Performance Materials & Components (mostly jet engine materials) and Advanced Alloys & Solutions. We valued the company as it exists today, using results from fiscal 2020 forward only, since the pre-2020 numbers describe a different, lower-margin commodity-steel business that no longer exists. That six-year window (2020-2025) captures a full cycle for this business: the COVID-era collapse in aircraft production (2020-2021, when owner earnings were roughly break-even to slightly negative), the recovery (2022-2023), and the current up-cycle (2024-2025), when commercial jet engine sales grew over 20% and owner earnings reached roughly $2.60 per share. Taking the middle of that range, not just the recent strong years, gives a normalized starting point of about $1.93 per share, which we then grow forward. One accounting judgment worth flagging: ATI's cash flow swings significantly from year to year because of working-capital needs tied to its multi-year supply contracts (funding inventory and receivables as engine build rates ramp). We removed these swings from the earnings figure we use as a starting point, on the view that they wash out over a full cycle; this is why 2022, a year of unusually large inventory and receivables investment as the recovery took hold, shows the highest per-share owner earnings in our data even though cash actually generated that year was comparatively modest. We think this fairly represents the underlying earning power of the business, but it does mean the year-to-year figures are more volatile than the business feels operationally. In fiscal 2025, owner earnings grew about 18% versus fiscal 2024, driven almost entirely by commercial jet engines (sales up 21%), while sales tied to airframes actually fell 16%, a sign that engine demand and airframe production are not moving in lockstep. Because of that airframe softness, we assumed first-year growth in our base case below the trailing rate (about 10%), tapering to the low single digits by year ten as the current up-cycle in engine build rates eventually matures. Our base case assumes ATI continues to benefit from strong, contracted demand for jet engine materials and modest growth in defense, with growth decelerating over the decade as production rates normalize toward a sustainable long-run pace. This produces a base-case value of roughly $55 per share. Our bear case assumes a renewed slowdown in aircraft production, either a repeat of the kind of build-rate disruption that has affected Boeing programs in recent years, or a broader pullback as aerospace manufacturers work through elevated inventories, combined with the drag of roughly $1.75 billion of debt on the balance sheet. That debt makes a downturn more painful since it isn't subtracted from the value we calculate directly; instead we account for it by making the bear case itself more severe. We think a scenario resembling the 2021 trough, sustained for longer rather than snapping back quickly, produces a value of roughly $12 per share. Our bull case assumes the current jet-engine up-cycle continues for longer and at a faster pace than the base case, with continued gains in higher-value alloys and a successful ramp of next-generation engine programs, producing a value of roughly $84 per share. Because so much of this value comes from what the business earns many years from now, roughly two-thirds of our base-case estimate reflects earnings beyond the next decade, the valuation rests heavily on ATI remaining one of a small number of qualified suppliers for jet engine materials over the long run. We think that's a reasonable assumption given the company's decades-long record of requalifying across successive generations of aircraft engines, but it is the single largest assumption behind the number. On the positive side, ATI has been paying down debt (from about $1.9 billion to about $1.75 billion over the past year) and returning cash to shareholders through buybacks (roughly $470 million in fiscal 2025 alone), both signs of a business generating real cash beyond its reinvestment needs. Given the real cyclicality in this business plus its meaningful leverage, the margin-of-safety price sits at a substantial discount to our estimate of fair value, roughly 50%, at around $27 per share.