Donaldson's Facet Bet Rewrites the Growth Playbook
Record Q4, a transformative acquisition, and a new Process Filtration segment put the filter maker on a higher-growth path—if it can execute.
DCI · Earnings Call · 2026-08-26
A Quarter That Resets the Bar
Donaldson Company closed fiscal 2026 with a bang: fourth-quarter sales crossed $1 billion for the first time, adjusted EPS grew 12%, and operating margin hit an all-time high of 17.5%. CEO Richard Lewis framed the year as "another record year," driven by Facet acquisition and a series of operational wins. But the headline is not the beat; it is the strategic transformation that began with the $1.9 billion acquisition of Facet Filtration in May 2026 — a move that shifts Donaldson's center of gravity from cyclical OEM exposure toward durable aerospace, defense, and power generation markets.
Our execution on our clear and balanced growth strategy is yielding higher levels of performance.
The results validate the strategy: mobile aftermarket grew 9% in Q4 with double-digit gains in the independent channel, and life sciences jumped 10% on the strength of disk drive and food & beverage. Yet the real story is what comes next.
Facet: The Growth Multiplier
Facet, Donaldson's largest-ever acquisition, added 3 points to Q4 sales growth and was roughly $0.06 dilutive to EPS, as Bradley Pogalz noted: "Facet's business results were in line with forecast... while amortization and interest were a bit higher than previously expected." For fiscal 27, the company guides to EPS of $4.30 at the midpoint, including $0.12 of dilution from Facet. But management emphasizes that on a cash basis, Facet is already accretive — a theme reiterated in prior calls. As Richard stated on the May 2026 call, "it's a great end market with a lot of natural tailwind. Higher margins, so I think double our margin profile higher growth rates."
The acquisition also reshapes Donaldson's portfolio. In Q4, aerospace and defense sales (now including Facet) surged 61% organically, and the segment is expected to grow over 50% in fiscal 27. The power generation business, a key Facet end market, remains booked out with "line of sight to fully loading our capacity through 2028," according to Richard. This moves Donaldson from a supplier to cyclical ag and truck to a player in structurally growing defense and energy markets.
Process Filtration and the Data Center Tide
A more subtle but equally significant shuffle is the creation of a new process filtration segment, combining food & beverage and microelectronics. Richard explained that "the underlying filtration technologies, including membrane platforms... extend to our microelectronics business," and the company sees "increasingly commonality in the capabilities required to serve them." This structure is designed to capture demand from data center AI expansion, particularly in liquid cooling and disk drive filtration. The company's life sciences margin hit 11.9% in Q4, up 660 bps, and guidance implies continued strong growth.
The global tape confirms this theme: "AI data center" is among the top 360-day advancers, with 46 positive mentions, and Donaldson's disk drive business is riding the same wave. The company's own keyword trajectory shows "data center AI" entering its top-30 for the first time in Q4 2026, a clear alignment with a market-wide force.
Execution Is the Watchword
Yet the market is not rewarding Donaldson as richly as its record results might suggest. The stock trades at 23.7x trailing net income, below its 10-year high, and is still 13.9% below its February peak. Analysts' questions on the call focused on execution risk: the Mexico plant ramp for power generation (still causing ~40 bps of gross margin pressure), the closure of the California A&D facility, and the integration timeline for Facet. Bradley pointed to "a couple acute issues" but expressed confidence that margins return to normalized levels in the second half of fiscal 27.
Indeed, the company's fundamentals confirm the pivot. Total revenue for Q4 reached $995M, up 11% sequentially, and free cash flow swung to $108M. However, the balance sheet has shifted: net debt now stands at -$388M after funding Facet, though leverage is a modest 1.4x net debt/EBITDA. The company has already paid down over $100M of debt and restarted buybacks.
The real test is whether Donaldson can sustain mid-teens A&D growth, recover power gen margins, and deliver on the $10M annualized footprint savings. If it does, the combination of Facet's high-margin revenue and the process filtration growth engine could push operating margins toward 18% or higher by fiscal 2028. As Richard stated, "we begin fiscal 27 with robust order volumes, healthy backlogs, and focused execution." The market will be watching to see if that translates into the promised "another record year."