Allison Transmission Holdings, Inc. (ALSN) Income Statement

The sharp sequential rebound in 2026 appears driven by lumpy vocational and defense shipments rather than a steady volume trend, which makes the quarterly growth rates difficult to extrapolate. The trailing decline indicates the earlier contraction has not fully reversed, and investors should monitor whether Q2 momentum persists into subsequent quarters. Based on reported figures, the mix shift toward defense and North American truck demand may be more durable than the headline swings suggest.

The compression in 2026Q1 and 2026Q3 coincides with revenue swings, which suggests fixed manufacturing overhead is being spread unevenly across shipment volumes. Margins in the 46-49% range during steadier quarters point to a durable pricing position relative to vocational peers. Investors should monitor whether mix toward lower-margin defense or international volumes may be diluting the blended margin going forward.

SG&A has remained relatively contained at roughly $75M to $142M per quarter, so the operating margin expansion in favorable quarters appears to be largely a function of volume absorption rather than cost discipline alone. The same leverage works in reverse during downturns, as the 2025 period showed operating margins holding near 29-32% even as revenue declined. This suggests the cost base is lean but still carries meaningful fixed components that warrant ongoing monitoring.