Finvest
ATI Specialty Materials · Aerospace · Defense · Specialty alloys · Thesis updated July 12, 2026

Aerospace strength is paying off, at a price

01 Running thesis

A cleaner aerospace story

ATI is now a clearer aerospace and defense story. In Q1 2026, aerospace and defense were 69% of sales, up from 68% for fiscal 2025 and 62% for fiscal 2024. That mix matters because these markets use hard-to-make alloys and parts where ATI can earn better margins.

The latest quarter changed the debate. Adjusted free cash flow was $75 million, a $218 million improvement from the Q1 2025 cash use. Adjusted EBITDA margin also rose 310 basis points to 20.1%. That answered the main bear worry from 2025, which was that inventory and receivables were eating cash.

The bull case is simple: ATI is turning a strong aerospace and defense cycle into higher margins and better cash flow. The 5-year, $1 billion naval nuclear contract gives the company a visible defense revenue stream with margins management says are similar to aerospace.

The bear case has shifted, not gone away. ATI is choosing to de-emphasize weaker industrial, medical, and electronics markets. That may help margins, but it also makes the company more dependent on commercial aerospace and defense. With valuation already scoring weakly, the market may punish any miss faster.

Apr 2026▲Q1 2026 strengthened the thesis. Free cash flow improved by $218 million year over year, adjusted EBITDA margin reached 20.1%, and ATI renewed a 5-year, $1 billion naval nuclear contract.
Apr 2026→The Q1 2026 10-Q also showed the tradeoff. Aerospace and defense rose to 69% of sales, but managed working capital increased to 34.8% of annualized sales from 32.5% at year-end.
Feb 2026▲The 2025 10-K showed aerospace and defense at 68% of sales, up from 62% in 2024. HPMC and AA&S margins also expanded for the full year.
Oct 2025→Q3 2025 showed strong aerospace mix and better segment margins, but working capital rose to 36.4% of sales. A magistrate judge recommendation reduced the pension litigation risk.
Jul 2025▼Q2 2025 raised cash conversion concerns as managed working capital increased to 36.5% of sales. AA&S margins also fell year over year.
May 2025→Q1 2025 confirmed aerospace and defense strength, with that market at 66% of sales. The same filing brought back the working capital worry as the metric rose to 35.9% of sales.
Feb 2025▲The 2024 10-K showed aerospace and defense at 62% of sales and managed working capital steady at 30.9% of sales. AA&S margin improvement supported the margin story.
Oct 2024→Q3 2024 kept the aerospace mix shift intact, with aerospace and defense at 62% of sales. Working capital rose sharply to 40.0% of annualized sales, and pension litigation became a new uncertainty.
02 Business model

Hard metals for hard jobs

ATI makes specialty materials and complex parts that go into places where normal metals do not work well. Think jet engines, airframes, naval nuclear systems, energy equipment, medical devices, and electronics. Customers pay for metals that can handle heat, stress, corrosion, or strict safety rules.

The company earns money by selling alloys, forgings, castings, components, and rolled products. Its edge comes from materials science and process know-how. In plain English, ATI knows how to make metal recipes and shapes that are hard for others to copy.

The model works best when aerospace and defense demand is strong. Higher plant use and a richer product mix can lift margins. It breaks when customers cut aircraft builds, defense orders slow, raw material costs jump, or working capital rises again.

03 Product portfolio

The metal mix

Growth engine

Nickel-based alloys and specialty alloys

This was 49% of Q1 2026 revenue by product category. These alloys are important for high-heat aerospace and defense uses, especially jet engines.

Growth engine

Precision forgings, castings and components

This was 20% of Q1 2026 revenue. These are shaped parts that can go into demanding aircraft, defense, and energy systems.

Steady

Titanium and titanium-based alloys

This was 17% of Q1 2026 revenue. Titanium is valued for strength with lower weight, which makes it useful in airframes and other weight-sensitive systems.

Steady

Zirconium and related alloys

This was 9% of Q1 2026 revenue. These materials are used in specialized energy and industrial settings where corrosion resistance matters.

Cash cow

Precision rolled strip products

This was 5% of Q1 2026 revenue. These products serve narrower uses and are less central to the current aerospace and defense growth story.

04 Business segments

Two segments, one main cycle

High Performance Materials & Components53%modest
Advanced Alloys & Solutions47%flat

The segment mix is based on Q1 2026 segment sales implied by disclosed segment EBITDA and margins. HPMC is more concentrated in aerospace and defense, with about 93% of its Q1 revenue from those markets, while AA&S was about 43%.

05 Risk factors

What could break the thesis

Aerospace and defense concentration

High impact · Medium odds

Aerospace and defense were 69% of Q1 2026 sales. That focus is helping margins now, but it also raises cycle risk. If jet engine, airframe, or defense demand slows, ATI has fewer non-core markets to offset the hit.

We watchAerospace and defense sales mix, jet engine demand, defense revenue growth, and total backlog.

Cash conversion slips again

High impact · Medium odds

Q1 adjusted free cash flow improved by $218 million year over year, which eased the main bear case. Still, managed working capital rose to 34.8% of annualized sales from 32.5% at year-end 2025. The filing says this was tied to seasonal inventory and shipment timing, but investors should not ignore it.

We watchManaged working capital as a percentage of annualized sales and adjusted free cash flow conversion.

Non-core markets keep shrinking

Medium impact · High odds

Management is de-emphasizing industrial, medical, and electronics markets, and expects them to trend down by low to mid-single digits for the full year. This can improve mix, but it also cuts diversification. The open question is how much of ATI should be aerospace and defense over time.

We watchSales trends in industrial, medical, electronics, and conventional energy.

Raw material and energy shocks

Medium impact · Medium odds

ATI uses specialized metals, and its cost base can move with raw material and energy prices. The company also disclosed a new risk from the February 2026 conflict between the United States, Israel, and Iran. ATI does not expect a significant direct effect, but escalation could raise global energy costs and weaken macro conditions.

We watchNickel, titanium, and energy prices, plus any signs of supply disruption.

Pension litigation overhang

Medium impact · Low odds

Two lawsuits were filed in August 2024 about ATI's 2023 pension obligation transfer. In August 2025, a magistrate judge recommended dismissing all plaintiff claims for lack of standing. That is positive, but the presiding judge still has to review and decide.

We watchFinal court action on the pension transfer lawsuits.
06 Quick answers

In one breath

What does ATI Inc. make?

ATI makes specialty metals and engineered parts. Its products include nickel alloys, titanium alloys, zirconium alloys, forgings, castings, components, and rolled strip products.

Why is aerospace so important to ATI?

Aerospace and defense were 69% of Q1 2026 sales. These markets need high-performance materials, so they can support better pricing and margins when demand is strong.

What changed in ATI's latest quarter?

Q1 2026 showed better cash flow and higher margins. Adjusted free cash flow improved by $218 million year over year, and adjusted EBITDA margin expanded to 20.1%.

What is the main risk for ATI stock?

The main risk is concentration in aerospace and defense. That focus is helping results today, but a downturn in those markets would hit ATI harder as it de-emphasizes non-core markets.