Sterling Infrastructure, Inc. (STRL Quick QuoteSTRL - Free Report) has fallen 35.9% over the past four weeks even as operating growth and earnings estimates have moved higher. The pullback puts more weight on whether execution can keep pace with a rapidly expanding mission-critical opportunity set.

The investment case now turns on the durability of backlog, the margin effect of CEC’s faster growth and Sterling’s ability to convert rising earnings into cash.

STRL's 35.9% Drop Tests Investor Conviction

Third-quarter 2026 revenues surged 127% year over year to $1.56 billion, while adjusted earnings increased 118% to $7.58 per share. Both measures topped the Zacks Consensus Estimate, underscoring the gap between business performance and the recent share-price decline.

Sterling Infrastructure, Inc. Price and Consensus

Sterling Infrastructure, Inc. price-consensus-chart | Sterling Infrastructure, Inc. Quote

The Zacks Consensus Estimate for current-year earnings moved 9.5% higher over the past four weeks. That revision trend supports the earnings outlook, but the selloff suggests investors are assigning greater importance to margin quality, project timing and cash generation.

Sterling's Backlog Supports Longer-Term Growth

Signed backlog increased 61% year over year to $4.14 billion at Sept. 30, 2026, while combined backlog rose 78% to $6.14 billion. Including future phases in design, total scoped work approached $8 billion, with E-Infrastructure representing nearly $7 billion and mission-critical projects accounting for roughly 95% of that opportunity.

Quanta Services, Inc. (PWR Quick QuotePWR - Free Report) reported record third-quarter 2026 backlog of $63.7 billion as demand broadened across utility, power generation, industrial and technology customers. EMCOR Group, Inc. (EME Quick QuoteEME - Free Report) serves advanced industries, including hyperscale data centers, through electrical and mechanical construction capabilities.

STRL's CEC Mix Pressures E-Infrastructure Margins

CEC generated $425.6 million of third-quarter revenues and is expected to exceed $1 billion in 2026 revenues. Its expansion gives Sterling more electrical exposure, but the business carries structurally lower margins than site development because materials represent a larger share of project costs.

E-Infrastructure operating margin fell to 22.6% from 25.6% a year earlier as CEC became a larger contributor. CEC’s core margin has improved by more than 150 basis points since the acquisition, but noncore operations are expected to reduce its full-year 2026 margin by about 160 basis points.

Sterling's Cash Conversion Adds Another Risk

Rapid E-Infrastructure growth has increased working-capital needs. Trailing 12-month cash-flow conversion stands at 110.5%, below Sterling’s 138.4% trailing median, while free-cash-flow conversion of 85.8% is below its 113.3% median.

Accounts receivable rose substantially during the first nine months of 2026 as project activity expanded. Operating cash flow still reached $427.1 million, but sustained working-capital demands could keep near-term cash conversion below Sterling’s historical norms.

STRL's Ratings Signal Near-Term Support

The bottom line is that Sterling’s growth pipeline remains substantial, but the 35.9% pullback is not explained by weak operating results alone. Investors still need to weigh CEC-driven margin dilution and working-capital intensity against the company’s expanding mission-critical backlog.

STRL currently carries a Zacks Rank #2 (Buy). Its Momentum Score of A, VGM Score of A and Growth Score of B provide favorable near-term style signals alongside the positive estimate-revision trend, while the Value Score of C points to a more balanced valuation profile rather than the strongest value setup. You can see the complete list of today’s Zacks #1 Rank (Strong Buy) stocks here.