Cummins (CMI) Q3 2026 Earnings: Truck Recovery Lifts Engine Margins

Cummins Q3 2026 earnings show the North American truck recovery turning into higher margins in the company's Engine and Components segments. Cummins (CMI) reported results for the quarter ended September 30, 2026, on November 5, 2026, through its third-quarter 10-Q and earnings call [1][2]. Three questions framed the quarter: whether rising heavy- and medium-duty truck demand would accelerate Engine revenue and margins, whether higher Components volume would outweigh warranty and compensation costs, and whether data center generator sets could keep growing at strong margins while large-unit capacity was full. The first two were confirmed. Power generation stayed strong on growth and margins, but a supplier problem held back revenue. Overall, earnings were stronger than revenue: weaker pickup truck demand led Cummins to cut its full-year revenue growth guidance to about 10%, the industry expects 2027 North American truck production to be flat, and the final EPA 2027 emissions rule has not yet been issued [2].

Cummins is one of the world's largest independent makers of diesel and natural gas engines. It sells engines and components such as axles and aftertreatment systems to truck makers including PACCAR, Traton and Daimler, and it sells parts, service and generator sets through its distribution network [3]. Its Power Systems segment makes high-horsepower engines and data center generator sets [3].

Engine revenue accelerated and margin recovered to 13.5%

Engine segment revenue rose 20% year over year to $3.13 billion in the third quarter, and the segment margin rose to 13.5% from 10.0% a year earlier [1]. Heavy-duty truck engine revenue grew 32% to $1.016 billion, and medium-duty truck and bus revenue grew 33% to $1.045 billion. Segment EBITDA increased by $161 million, which the 10-Q attributed to higher volumes [1]. Research and development expense grew 17%, slower than revenue, which indicates that the first-half margin decline came mainly from low volume rather than from a lasting burden of new-platform spending [1].

Industry production supports the demand recovery. Cummins said North American heavy-duty truck production was about 70,000 units in the quarter, up 62%, and medium-duty production rose 77%, although medium-duty demand fell short of the company's expectations because of uncertainty over emissions rules [2]. Management said pre-buying ahead of the new rules has been limited this year; the disclosures do not allow that judgment to be verified independently [2].

Pickup trucks were the offset. Cummins shipped 34,000 pickup truck engines in the quarter, down 16%, and light-duty automotive revenue fell 14%; the company attributed the decline to elevated diesel prices and interest rates [1][2]. As a result, Cummins lowered its full-year Engine revenue growth guidance to 8% to 11% from 9% to 14%, and its margin guidance to 12.25% to 12.75% from 12.5% to 13.25%. It kept its full-year forecast of 240,000 to 250,000 North American heavy-duty trucks [2].

Components margin rose to 14.3% on volume

Components segment revenue rose 23% year over year to $2.856 billion in the third quarter, and the segment margin increased to 14.3% from 12.5% [1]. Drivetrain and braking, emission solutions, and components and software each grew about 20%. The 10-Q attributed the growth to North American medium- and heavy-duty truck demand, and its explanation of profit cited only volume and compensation [1].

Warranty costs still rose. Segment warranty expense was $57 million in the third quarter, compared with $29 million a year earlier, and the reason was not disclosed [1]. Cummins also lowered its full-year Components margin guidance to 13.25% to 13.75%, which implies the fourth-quarter margin may decline [2].

Power generation margins expanded while a supplier constrained shipments

Power Systems revenue rose about 15% year over year to $2.289 billion in the third quarter, with power generation up 22%, and the segment margin increased to 25.4% from 22.9%. The 10-Q attributed the profit increase to volume and favorable pricing [1]. A problem at one supplier limited large-engine production, and management estimated that about $200 million of revenue moved into the fourth quarter [2]. Cummins kept its full-year guidance for power generation revenue growth of 15% to 25%, and said the fourth-quarter segment margin will temporarily fall to about 22.5% [2]. New capacity starts to come online only in 2027, and capital expenditures of $741 million in the first nine months were behind the full-year plan of $1.35 billion to $1.45 billion [1][2].

Conclusion

The quarter strengthens the case for operating leverage in the on-highway businesses: as truck volumes recovered, Engine and Components margins improved together, and the company's EBITDA margin reached a record 18.9% [4]. Cash generation also improved, with operating cash flow of $3.213 billion in the first nine months compared with $2.087 billion a year earlier [1]. Growth still has limits: weaker pickup demand lowered the full-year guidance, power generation shipments are constrained by a supplier and by capacity, and the industry expects 2027 North American truck production to be flat [2]. The next evidence includes whether the delayed power generation shipments are recovered in the fourth quarter, whether Components warranty expense comes down, and how the final EPA rule, expected in December, sets non-compliance penalties [2].

Sources

[1] CMI Q3 2026 10-Q filed 2026-11-05, 2026-11-05, SEC Form 10-Q, https://www.sec.gov/Archives/edgar/data/26172/000002617226000037/cmi-20260930.htm [2] CMI Q3 2026 earnings call 2026-11-05 · transcript, 2026-11-05, earnings call transcript, drillr://earning_call_summary/CMI/2026-11-05 [3] CMI FY2025 10-K business and customers filed 2026-02-10, 2026-02-10, SEC Form 10-K, https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=0000026172&type=10-K&dateb=&owner=include&count=40 [4] CMI 8-K filed 2026-11-05 · Exhibit 99 Q3 2026 earnings release, 2026-11-05, SEC Form 8-K earnings release, https://www.sec.gov/Archives/edgar/data/26172/000002617226000035/cmi2026q38-kex99.htm