Sterling Q3 2026 Earnings: E-Infrastructure Drives 127% Revenue Growth

Sterling Infrastructure (NASDAQ: STRL) reported Q3 2026 revenue of $1.56 billion, up 127% from $689.0 million, while diluted EPS rose 133% to $6.92 from $2.97. E-Infrastructure supplied 83% of revenue and drove most of the increase, while consolidated operating margin expanded despite lower gross and E-Infrastructure margins. Sterling also raised its full-year 2026 guidance.

Core Earnings Results

For the quarter ended September 30, 2026, operating income grew faster than revenue, while adjusted net income increased 119% to $235.4 million. Management said the reported revenue increase included 70% organic growth, distinguishing underlying expansion from the contribution of acquired operations.

Adjusted results exclude items including stock-based compensation, intangible amortization, acquisition-related costs, earn-out expense and the loss on debt extinguishment.

Business and Segment Performance

E-Infrastructure accounted for nearly all of Sterling’s consolidated growth. Transportation revenue declined as resources moved toward E-Infrastructure work, but more selective project activity supported higher profit and margins. Building Solutions remained the weakest segment.

E-Infrastructure’s site development revenue increased 133%. CEC, acquired on September 1, 2025, contributed $425.6 million, compared with $41.4 million during the prior-year partial ownership period. On a pro forma basis assuming a full quarter of ownership in Q3 2025, CEC revenue grew 305%.

Transportation’s adjusted operating margin expanded 410 basis points to 19.7%, reflecting Sterling’s project selection and resource reallocation. Building Solutions’ adjusted operating income fell 38.7% to $7.7 million as slower homebuilder activity weighed on both revenue and profitability.

Overhead Leverage Offsets CEC Mix Pressure

Sterling’s gross margin declined to approximately 24.1% from 24.7%, while E-Infrastructure’s operating margin fell 300 basis points. The company attributed the segment decline to the greater revenue contribution from CEC, even though CEC’s own operating margin improved both sequentially and year over year.

Despite that mix pressure, consolidated operating margin increased to 19.6%. General and administrative expenses rose in absolute dollars but declined to approximately 3.9% of revenue from 5.5%, while acquisition-related costs fell to $2.1 million from $5.3 million. Transportation’s margin expansion also helped offset the lower E-Infrastructure and Building Solutions margins.

Backlog and Demand Visibility

Signed backlog reached $4.14 billion at September 30, up 61% from the prior-year period. Combined backlog increased 78% to $6.14 billion, including $2.00 billion of unsigned awards.

The signed-backlog book-to-burn ratio was 0.9 times, meaning signed additions did not fully replace quarterly revenue recognized. The combined ratio was 1.4 times, indicating stronger replenishment when unsigned awards are included. Investors therefore need to distinguish signed work from awards that have not yet converted into backlog.

Management also identified nearly $8 billion of broader scoped work, including signed backlog, unsigned awards and future phases in design, up approximately 90%. Within E-Infrastructure, that opportunity approached $7 billion, with mission-critical data center, manufacturing and semiconductor projects representing approximately 95%.

Profitability, Cash Flow and Balance Sheet

Cash flow information was provided for the first nine months rather than Q3 alone. Nine-month operating cash flow increased to $427.1 million from $253.9 million, even as changes in operating assets and liabilities used $203.7 million of cash.

Cash and equivalents declined to $216.9 million from $390.7 million at December 31, 2025. Major nine-month uses included $165.0 million for acquisitions, $115.5 million of capital expenditures and $107.3 million of share repurchases. Financing activities used a net $324.6 million, including debt repayments.

Current and long-term debt totaled approximately $95.3 million at September 30, down from approximately $291.0 million at year-end 2025. The lower cash balance therefore accompanied acquisition spending, higher capital investment, repurchases and substantial debt reduction rather than weak operating cash generation.

Full-Year 2026 Guidance

Sterling raised its full-year outlook following the quarter, although the release did not reproduce the previous ranges. At the midpoints of the updated guidance, management said revenue, adjusted diluted EPS and adjusted EBITDA would increase 88%, 101% and 94%, respectively, from 2025.

Separate from the formal ranges, management said CEC could generate more than $1 billion of revenue in 2026. It also expects Building Solutions market conditions to remain challenging through 2026 because housing affordability continues to constrain demand.

Recent Insider Transactions

The supplied six-month insider summary lists 83,767 shares as purchases across 12 transactions and 2,500 shares sold in one transaction, producing net purchases of 81,267 shares. However, the latest individual records are predominantly zero-price stock awards or gifts rather than open-market purchases, so the net figure should be interpreted in that context.

All listed transactions involved direct holdings. The two October 5 awards were reported as separate records.

Risks Investors Need to Watch

• CEC mix and execution: CEC is contributing substantial revenue, but its heavier weight reduced E-Infrastructure’s margin. Continued scaling and margin improvement will affect whether revenue growth translates into proportionate profit growth.
• Conversion of future work: Combined backlog includes $2.00 billion of unsigned awards, while the signed-backlog book-to-burn ratio was below one. Timing and conversion of awards and future project phases remain important.
• Building Solutions demand: Slower homebuilding activity reduced segment revenue and operating income, and management expects housing affordability to keep conditions challenging through 2026.
• Working-capital and capital demands: Rapid expansion used $203.7 million through changes in operating assets and liabilities during the first nine months. Acquisitions, capital spending, repurchases and debt reduction also lowered cash despite higher operating cash flow.

Summary

Sterling’s Q3 2026 growth was led by E-Infrastructure, with both site development and CEC contributing to the revenue increase. Operating leverage and Transportation margin gains lifted consolidated profitability even as CEC mix reduced E-Infrastructure’s margin. The next points to monitor are CEC’s margin progression, conversion of unsigned awards into signed backlog, cash requirements associated with rapid growth and the continuing weakness in Building Solutions.