Sterling Infrastructure (NasdaqGS: STRL) is no longer just a road-and-highway builder. The Woodlands, Texas–based contractor has spent the last two years pivoting toward site development and electrical work for data centers, and its second-quarter numbers make the transformation impossible to miss. Let's dig into the Q2 2026 10-Q to see how the mix shift is showing up in the income statement — and what it's costing in margin along the way.

Revenue Nearly Doubles on an AI-Fueled E-Infrastructure Boom

Second-quarter revenue hit $1.17 billion, up 90% from $614.5 million a year ago. Net income attributable to Sterling shareholders more than doubled to $155.8 million, and diluted EPS jumped to $5.00 from $2.31.

The engine is the E-Infrastructure Solutions segment — large-scale site development (grading, excavation, utilities) for data centers, e-commerce warehouses and manufacturing plants, now bundled with specialty electrical and mechanical contracting. Segment revenue nearly tripled to $905 million, or 78% of the total, up from 51% a year ago. Transportation Solutions (highways, bridges, aviation) and Building Solutions (residential concrete slabs and commercial builds) now account for just 13% and 9%, respectively.

Two deals drove much of this: CEC Facilities Group, an Irving, Texas electrical/mechanical contractor bought for roughly $562 million in September 2025, and Stone Ridge Contracting, an Idaho-based site developer acquired June 1, 2026 for $178 million that pushes Sterling into the Pacific Northwest. But acquisitions aren't the whole story. The filing's pro forma figures — which restate both years as if the deals had always been owned — show revenue would still have grown 58% ($1.20B vs. $760M). That's genuine underlying demand.

Forward visibility looks strong too. Remaining performance obligations (RPOs) — contracted work not yet performed, essentially backlog — reached $4.23 billion, up 41% from $3.01 billion at year-end. E-Infrastructure RPOs alone rose 74% to $3.21 billion, and management expects about 74% of total RPOs to convert to revenue within 12 months.

The Margin Story Is More Nuanced

Consolidated gross margin improved to 24.8% from 23.3%, but the segment detail reveals crosscurrents:

• E-Infrastructure operating margin fell to 23.3% from 27.0%. Adding CEC's electrical/mechanical work — historically a lower-margin business than pure site development — diluted the segment's profitability even as operating income grew 152% in dollar terms.
• Transportation was the surprise. Revenue fell 20% to $156.7 million as Sterling walked away from low-margin work (its "Other Services" end market shrank from $47.9M to $21.2M), yet operating income rose to $28.2 million and margin expanded to 18.0% from 13.2%. Helping that figure: $4.4 million of equity earnings from RHB, a 50%-owned Nevada highway builder whose revenue isn't consolidated but whose profits land in this segment.
• Building Solutions is the soft spot. Revenue was flat at $106.5 million and operating margin slipped to 8.0% from 9.2% (7.3% vs. 11.1% year-to-date), reflecting a sluggish residential market. Management points to population growth and structural housing shortages as reasons for eventual recovery.

Below the operating line, acquisition-related costs of $12.5 million (five times last year's) weighed on results, and interest income dropped to $3.8 million from $6.9 million as cash went toward deals. The effective tax rate fell to 23.3% from 25.7%, partly because $12.8 million of income belongs to noncontrolling interests in construction joint ventures.

A Balance Sheet Getting Stronger

Operating cash flow for the first half was $328 million, nearly double last year's $170 million — helped by Sterling's customer-funded model, where contract liabilities ($802.6 million) far exceed contract assets ($156.3 million). Notably, on July 2, 2026, Sterling repaid the entire $285 million term loan and entered a new credit agreement, effectively going debt-free. Of the $464 million cash balance, though, $157.6 million sits inside construction JVs and isn't freely available.

The Bottom Line

Sterling has bet its future on the data center buildout, and right now that bet is paying off spectacularly. The risks are the flip side of the same coin: 78% of revenue now depends on one end market, lump-sum contracts (which put cost overruns on the contractor) grew to 63% of revenue from 53%, and goodwill plus intangibles now total $1.28 billion — 40% of assets. Peers like MasTec, Quanta Services, and Primoris are chasing the same electrified-infrastructure dollars, while Building Solutions serves as a reminder that Sterling's residential exposure can go sideways for quarters at a time. Execution on integration — and on that $4.2 billion of contracted work — is what to watch next.