Allison Transmission shares rose 6.5% on Tuesday to $$120.48, up from Monday's close of $$113.09, after the Indianapolis-based transmission and off-highway drivetrain maker reported third-quarter results and raised its full-year guidance for the second consecutive quarter. Diluted earnings per share were $2.30, up 41.0% from $1.63 a year earlier; adjusted diluted EPS, which strips out acquisition and restructuring costs, was $2.90, up 59.0%.
A second straight guidance increase
Allison told investors it now expects full-year net sales of $5,975 million to $6,075 million, adjusted EBITDA of $1,530 million to $1,580 million, and adjusted free cash flow of $850 million to $900 million, all raised from the range it gave on 3 August 2026. Chief executive David Graziosi attributed the increase to accelerating demand for medium-duty and Class 8 vocational trucks in North America and resilient mining and construction demand within the newly combined Off-Highway unit, even as industrial and agricultural end markets stayed subdued. During the quarter Allison paid $23 million in dividends and repurchased $57 million of its own stock, leaving $1,068 million of authorisation remaining under its buyback programme, the company said.
A big move on light volume
Tuesday's gain is 3.3x Allison's typical daily move of 2.0% over the past year, the largest advance in this direction since 8 April 2026. Peer construction-machinery and heavy-transportation-equipment shares rose a median 0.9% the same day, and the S&P 500 added 0.3%, so the reaction looks specific to Allison's own numbers rather than a sector or market move.
Growth is accelerating, but margins are not keeping up
The quarter extends a pattern visible in Allison's trailing figures. Revenue growth over the past twelve months accelerated to 37.6%, up 23.6 percentage points from the prior quarter, largely a function of the Off-Highway acquisition rather than organic expansion in the legacy business. Consolidated gross margin for the trailing year was 36.4%, and operating margin was 19.6%, down 11.7 percentage points year over year. The quarter's segment detail explains why: the legacy Allison Transmission unit posted 46.0 percent gross margin for the quarter, while the Off-Highway unit, inherited from Dana, ran at 15.0 percent gross margin and a 5.0 percent segment operating margin. Blending a lower-margin business into the group mechanically pulls the consolidated ratio down even as revenue climbs. Trailing free cash flow grew 12.7% to $737.0 million, but the free-cash-flow margin was 16.7%, down 3.7 percentage points, sitting at the 2.38 percentile of the company's own history. Net income over the same period fell 30.6%, and diluted shares outstanding fell 2.6%; the quarter's $57 million of repurchases are a single data point within that full-year change, not a stated explanation for it.
An alternative reading of today's gain is that investors responded less to the margin mix than to the clearer signal of a second consecutive guidance increase, which reduces uncertainty about how the newly combined Off-Highway business is bedding in after a complex acquisition. On that reading, the market may simply be rewarding confirmation that Allison's own outlook keeps moving up, independent of what the segment mix is doing to margins. For the fuller history behind these figures, see Allison Transmission's full company analysis.
Why Allison's growth assumption drives most of its valuation
Fundamentalytics' discounted cash flow model for Allison uses a base-case stage-one growth assumption of 20.0%. If that growth assumption were 5.0 percentage points lower, model value would fall 26.8%; 5 points higher, it would rise 34.2%. The margin side of the model moves in the opposite direction from today's revenue news: each 1-point decline in free-cash-flow margin lowers model value by −6.7%, and if the past year's full margin decline persisted, model value would fall 19.9%. A 1-point rise in the discount rate would lower value by −18.0%. Today's results pull on both inputs at once: the accelerating revenue growth feeds the larger of the two figures above, while the margin compression documented in the same results works against it. These are model values under stated assumptions, not a comparison with the share price.