Donaldson Company, Inc. (NYSE: DCI) ended fiscal 2026 with record quarterly and annual sales, a substantially stronger operating margin and an outlook that calls for another all-time high in fiscal 2027, giving the filtration company a demanding follow-up after a year in which GAAP net income increased 23.7% to US$453.8 million. Full-year sales reached US$3.886 billion, up 5.3%, while fourth-quarter sales crossed US$1 billion for the first time at US$1.059 billion, an 8% increase from the prior-year period.
Management expects fiscal 2027 sales to increase another 5.5%-9.5% and diluted EPS to reach US$4.22-US$4.38. At the midpoint, that would imply approximately 7.5% sales growth and EPS of US$4.30, about 11.7% above fiscal 2026 GAAP EPS of US$3.85. Donaldson expects operating margin between 16.6% and 17.2%, compared with 15.4% on a GAAP basis in fiscal 2026, making margin expansion rather than revenue growth alone central to the new-year earnings case.
The outlook also contains an important qualification. Donaldson says fiscal 2027 EPS will absorb approximately US$0.12 of dilution from the Facet Filtration acquisition, even though the business is already adding revenue and improving the mix of Donaldson’s Industrial Solutions segment. That leaves investors with a two-part test: whether the existing filtration businesses can continue expanding margins and whether the acquired aerospace and defence platform can generate enough future earnings to justify the additional debt and near-term dilution.
How much stronger were Donaldson’s fiscal 2026 earnings than its revenue growth?
Full-year revenue increased 5.3% to US$3.886 billion from approximately US$3.691 billion, adding about US$195 million of sales. GAAP net earnings, however, rose 23.7% to US$453.8 million from US$367 million, meaning profit expanded more than four times as quickly as revenue.
GAAP diluted EPS increased 26.2% to US$3.85 from US$3.05. Adjusted EPS, which removes restructuring, acquisition-related and other specified items, increased a more moderate 8.2% to US$3.98 from US$3.68.
The difference between the GAAP and adjusted growth rates reflects an unusually weak fiscal 2025 statutory comparison, including a US$62 million intangible-asset impairment in the prior year. Investors therefore should not interpret the 26% GAAP EPS increase as evidence that Donaldson’s underlying operating earnings grew at that same rate.
The operating-margin trend is nevertheless substantial. Full-year GAAP operating margin increased to 15.4% from 13.4%, a 200-basis-point improvement, while adjusted operating margin reached approximately 16%. Fourth-quarter operating margin increased to 16.7% from 15.5%.
Gross margin also improved, reaching 36.3% in Q4 compared with 34.5% a year earlier. Donaldson generated the additional profitability through pricing, product mix, operational improvements and stronger volumes rather than relying solely on revenue growth.
That makes the fiscal 2027 operating-margin target of 16.6%-17.2% particularly important. At the midpoint of 16.9%, Donaldson would add another roughly 150 basis points to fiscal 2026 GAAP operating margin.
Which Donaldson businesses drove the record fourth quarter?
Mobile Solutions remained Donaldson’s largest contributor and delivered 7.9% fourth-quarter sales growth.
Aftermarket revenue increased 9.4%, reflecting growth through both original-equipment and independent channels. On-Road sales increased 8.7% as truck production recovered in the United States and Europe, while Off-Road revenue was broadly flat because construction growth was offset by weaker agriculture demand.
The most dramatic reported increase came from Aerospace and Defense, where quarterly sales rose 61%.
That figure requires context. Donaldson said the Facet acquisition contributed approximately 980 basis points of growth to the entire Industrial Solutions segment and about US$30 million of company-wide quarterly sales. Organic Aerospace and Defense sales actually declined 2.8%, primarily because of continuing supply-chain constraints.
Industrial Solutions as a whole grew 7.7%, while Industrial Filtration Solutions revenue declined 2%. Strength in power-generation equipment and replacement parts was not enough to offset weaker dust-collection new-equipment demand.
Life Sciences provided another source of organic growth, increasing quarterly sales 9.7% and full-year revenue 12.8%. Its fourth-quarter earnings-before-tax margin reached 11.9% compared with 5.3% a year earlier, indicating that Donaldson’s efforts to improve profitability in the segment are beginning to show more clearly in financial results.
The mix consequently matters. Donaldson is no longer relying solely on filtration tied to trucks and heavy equipment. Aerospace, defence, power generation and life sciences are becoming increasingly important to the group’s ability to sustain growth when traditional industrial end markets weaken.
Is the Facet acquisition already improving Donaldson’s economics?
Facet contributed approximately US$30 million of fourth-quarter revenue and created a favourable mix effect on enterprise gross margin, according to Donaldson.
The acquisition strengthens Donaldson’s position in aerospace and defence filtration as well as power-generation applications, markets management views as more durable and potentially higher margin than several traditional industrial categories.
But the transaction has an immediate financial cost.
Long-term debt had risen to approximately US$1.28 billion by the end of fiscal 2026, while interest expense increased 48.8% for the year to around US$36 million. Donaldson repaid US$102 million of Facet-related debt during the fourth quarter, demonstrating that deleveraging has already become part of the post-acquisition capital-allocation agenda.
Fourth-quarter interest expense alone increased to US$14.7 million from US$7.1 million a year earlier.
The company therefore faces a familiar acquisition equation. Facet can expand revenue, margins and access to attractive aerospace markets, but the acquired earnings must eventually outweigh both the additional interest expense and the dilution embedded in fiscal 2027 guidance.
Donaldson expects around US$0.12 of EPS dilution from Facet during fiscal 2027. That does not mean management expects the acquisition to destroy value permanently; it reflects the near-term impact of acquisition financing and integration before the full earnings contribution develops.
The relevant evidence will emerge over several years rather than one quarter.
How much cash did Donaldson generate and return to shareholders?
Donaldson’s full-year cash conversion ratio reached 96.3%, compared with 93.2% in fiscal 2025. Fourth-quarter cash conversion was considerably stronger at 143.3%.
The company returned approximately US$250 million to shareholders during fiscal 2026, consisting of US$141.2 million of dividends and US$108.5 million of share repurchases. The repurchases retired approximately 1.2% of outstanding shares.
That capital return occurred in the same year Donaldson completed a significant acquisition and increased leverage.
The combination places greater importance on future cash generation. Management has to fund dividends, selectively repurchase stock, integrate Facet, reduce acquisition debt and continue investing in capacity and technology without compromising the balance sheet.
Fiscal 2027’s higher earnings outlook provides room for those priorities if cash conversion remains strong.
What must happen for Donaldson to reach its FY27 record targets?
The first requirement is continued volume growth.
Donaldson expects Mobile Solutions sales to rise 2%-6%, including mid-single-digit Off-Road growth and high-single-digit On-Road growth supported by construction and transportation end markets.
The second is continued margin improvement.
Moving group operating margin into the 16.6%-17.2% range requires productivity gains and favourable mix to continue despite inflation, acquisition costs and possible weakness in individual industrial markets.
The third is successful Facet integration.
The acquired company already contributed about US$30 million in Q4 revenue, but Donaldson needs that contribution to become sufficiently profitable to offset financing costs and the US$0.12 of projected FY27 EPS dilution.
The final requirement is resilience across the portfolio.
Fourth-quarter Industrial Filtration Solutions sales declined even as the company produced record overall results. Donaldson’s ability to offset weaker dust collection with stronger aftermarket, transportation, life sciences, power generation and acquired aerospace exposure is therefore a central part of the investment case.
Fiscal 2026 showed that mix working effectively. Sales increased only 5.3%, but operating margin expanded 200 basis points and GAAP net earnings rose nearly 24%.
Fiscal 2027 raises the hurdle again. Donaldson is guiding to another record sales year, another record earnings year and additional margin expansion while integrating the largest new element of its industrial portfolio.
The question is no longer whether Donaldson can grow. It is whether the company can make earnings compound materially faster than sales for another year without allowing acquisition leverage to dilute the quality of that growth.
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