Sterling’s Q2 Beat Fails to Impress as Margin Mix Fears Drive 10% Selloff

What happened

Sterling Infrastructure delivered a Q2 2026 triple beat, with revenue up over 90% YoY and EPS more than doubling, yet shares fell 10% as the market focused on high valuation and a margin mix shift within E-Infrastructure. Management raised full-year guidance and backlog jumped 116% to $4.3 billion, signaling multi-year visibility and strong AI data-center demand. The selloff reflects concerns that acquired electrical/mechanical work is diluting the segment’s historically robust 22% margin, undermining the premium multiple. This pullback brings the stock closer to our $700 attractive entry but reinforces our WAIT rating; we need confirmation that margins will stabilize above 20% and that the $1.4 billion in unsigned awards converts into executed backlog. The AI capex tailwind remains intact, yet expectations are still elevated, so we prefer to see another quarter of execution before adding exposure.

Implication

For investors, the Q2 report shows the double-edged nature of STRL’s AI exposure: demand is undeniable, but the quality of that demand is shifting. The 10% decline reflects the market’s razor focus on margins, and until E-Infrastructure’s blend stabilizes above 20%, multiple compression will remain a risk. Our base case relies on backlog conversion and margin resilience, and this print makes both uncertain. We maintain our WAIT rating and suggest building a position only if the stock dips to $700 or if next quarter’s numbers demonstrate that margin pressures are temporary.

Thesis delta

The Q2 results reinforce the core AI data-center growth narrative but introduce a new margin mix headwind that was only a risk in our prior report. The stock’s reaction lowers the price but not yet to our attractive entry, keeping the thesis WAIT. The key new variable is whether E-Infrastructure’s margin can stay above 20% as the lower-margin electrical business scales.