Limbach Holdings, Inc. (LMB) | The Buildout — AI Infrastructure
The Verdict
Limbach designs, delivers, and maintains the mechanical, electrical, plumbing, and controls systems that keep mission-critical buildings running. It serves owners and operators in healthcare, industrial, data centers, life sciences, higher education, and cultural and entertainment markets. For the AI buildout, its work shows up as fabricated infrastructure, retrofits, and early-lifecycle program management for data centers. The business matters because AI facilities depend on schedule speed and integrated building systems, but the company is not a pure AI play.
| Market Cap | — |
| Revenue (TTM) | $653M |
| Revenue Growth | +22.5% |
| EBITDA Margin (TTM) | 9.3% |
| Net Debt | $61M |
| Earnings Beats | 6 of 7 |
| P/E (TTM) | — |
| EV/EBITDA (TTM) | — |
What We Like
- Bookings of $616M over three quarters, including a Q1 2026 book-to-bill of 1.5x.
- Data center share of Q1 bookings was ~27%, with implied data center bookings of roughly $56M.
- CYMCOR, acquired August 4, 2026, expands Limbach's geographic footprint into Texas, Atlanta, Charlotte, and Virginia.
- Q2 free cash flow conversion was 98.2% of adjusted EBITDA, versus 89.7% a year earlier; full-year target is at least 75%.
- Jake Marshall's ~14-acre fabrication facility and other shops give management-described excess capacity, with a full-year capex run rate of about $5M.
What We’re Watching
- FY2026 adjusted EBITDA guidance was cut to $78M–$84M from $90M–$94M; gross margin guidance was cut to 23%–24%.
- ODR organic revenue declined 5.4% in Q1 2026 and 3.4% in Q2 2026.
- Pioneer Power margin convergence is targeted over 2–3 years; Q2 total gross margin was 21.5%.
- Post-Q2 law-firm investigation notices appeared after the guidance revision; they are not findings of wrongdoing.
The demand side of the thesis is intact: bookings, data center awards, and CYMCOR give real infrastructure exposure. The margin side is weakening near term, with management's reset cutting profit guidance while raising revenue. The open question is whether the $616M booked over three quarters converts to profitable revenue in H2 2026 and 2027.
Earnings Beat
Q2 2026 revenue was $173.5M, up 21.9% year over year, with ODR revenue of $128.4M and GCR revenue of $45.0M. Total gross margin was 21.5%, down from 28.0% a year earlier, while gross profit fell 6.4% to $37.3M. Adjusted EBITDA was $13.9M, down 22.3% year over year.
| Metric | Q1 FY2026 | Q4 FY2025 | Q1 FY2025 | YoY |
|---|---|---|---|---|
| Revenue | $139M | $187M | $133M | +4.4% |
| Gross margin | 22.4% | 27.0% | 27.6% | -520bps |
| EBITDA | $5M | $22M | $12M | −55.0% |
| EPS | $0.36 | $1.02 | $0.84 | −56.9% |
| Bookings | $182M | $209M | n/a | — |
| Free cash flow conversion | 98.2% | n/a | 89.7% | +9.5% |
Our results fell short of expectations driven by project timing and ongoing softness in health and institutional markets from elevated price sensitivity and market conditions pressuring gross margins. However, underlying customer demands remained healthy.— , August 5, 2026
Management tone: Q1 tone was confident and steady, with full-year guidance reaffirmed. Q2 shifted materially: management used 'reset' language, said results fell short, and raised revenue guidance while cutting adjusted EBITDA and margin guidance. Management stayed direct about operational levers and the gap between revenue and profit.
Management Guidance
Management revised FY2026 guidance on August 5, 2026: revenue of $760M–$790M, adjusted EBITDA of $78M–$84M, total organic revenue growth of 9%–14%, ODR organic growth of 6%–10%, ODR mix of 70%–80%, gross margin of 23%–24%, SG&A of 15%–16% of revenue, and free cash flow conversion of at least 75% of adjusted EBITDA. The guidance excludes CYMCOR and future acquisitions. Management also expects Pioneer Power gross margin improvement in the back half of 2026 and over the next 2–3 years.
Trajectory
Reported revenue moved from $138.9M in Q1 2026 to $173.5M in Q2 2026, up 21.9% year over year, after Q1 organic revenue declined 13.4%. Gross margin compressed from 27.6% a year earlier to 22.4% in Q1 and 21.5% in Q2. The drivers are Pioneer Power, lower project write-ups, and competition for skilled labor and materials tied to data center construction.
The Model
The model projects FY+1 revenue of $760M and EBITDA of $87M, an 11.5% EBITDA margin. For FY+2, the model projects revenue of $875M and EBITDA of $117M, a 13.4% EBITDA margin. The near-term anchor is management's revised FY2026 revenue guidance; FY+2 assumes the reset-year headwinds ease and CYMCOR begins contributing.
| Metric | FY2025 | Next FY (E) | Following FY (E) |
|---|---|---|---|
| Revenue | $647M | $760M | $875M |
| YoY Growth | — | +17.5% | +15.1% |
| EBITDA | $67M | $87M | $117M |
| EBITDA Margin | 10.4% | 11.5% | 13.4% |
Projections are the median of 5 independent model runs. The model’s revenue sits 11.3% above analyst consensus.
Management revised FY2026 guidance on August 5, 2026: revenue of $760M–$790M, adjusted EBITDA of $78M–$84M, total organic revenue growth of 9%–14%, ODR organic growth of 6%–10%, ODR mix of 70%–80%, gross margin of 23%–24%, SG&A of 15%–16% of revenue, and free cash flow conversion of at least 75% of adjusted EBITDA. The guidance excludes CYMCOR and future acquisitions. Management also expects Pioneer Power gross margin improvement in the back half of 2026 and over the next 2–3 years.
What Could Go Right — and Wrong
- Bookings convert at better-than-guided margins as GCR project starts rebuild and Pioneer Power improves faster than 2–3 years.
- CYMCOR replicates the healthcare pull-through model and turns its >$8B oversight into meaningful Limbach project bookings.
- Data center mix sustains or exceeds the ~27% Q1 bookings share and lifts fixed-cost absorption.
- Healthcare and institutional spending stabilizes, returning ODR organic growth to positive.
- Free cash flow conversion stays at or above the 75% full-year target.
- Margin reset extends past 2026 if GCR starts slip into 2027 and Pioneer Power convergence stalls.
- Healthcare and institutional price sensitivity persists into 2027, leaving ODR organic growth negative.
- Data center construction inflation widens the gap between revenue growth and gross profit.
- CYMCOR remains a small services add-on and fails to pull through project work.
- Additional M&A compounds integration strain before the current reset is complete.
Looking Ahead
Management's revised guidance points to a back-half-weighted 2026. The next 12 months test whether the hyperscaler fabrication project, Pioneer Power margin improvement, and rebuilt GCR backlog convert into profitable revenue. CYMCOR's 2027 target of $12M revenue and $4M adjusted EBITDA is the first measurable milestone for the data-center program-management strategy.
- H2 2026Back-half margin recovery — Tests revised gross margin and adjusted EBITDA guidance.
- Next few quartersHyperscaler fabrication revenue — Tests recognition of the >$30M steel structures and piping project.
- H2 2026Pioneer Power margin improvement — Tests progress toward company average gross margin.
- Q3/Q4 2026Bookings and data center share — Tests whether bookings stay near $180M–$210M and data center share is disclosed again.
- 2027CYMCOR contribution — Tests $12M revenue and $4M adjusted EBITDA target.
- 2026M&A in target regions — Tests appetite for Texas, Midwest, and Southeast acquisitions.
Financials
Annual Summary
| Metric | FY2024 | FY2025 | TTM | YoY |
|---|---|---|---|---|
| Revenue | $519M | $647M | $653M | +24.7% |
| Gross Margin | 27.7% | 26.4% | 25.1% | 132bps |
| EBITDA | $50M | $67M | $146M | +33.7% |
| EBITDA Margin | 9.7% | 10.4% | 9.3% | +71bps |
| Net Income | $31M | $39M | $33M | +26.5% |
| Free Cash Flow | $29M | $42M | $177M | — |
| Net Cash | — | — | — | — |
Key Ratios (Trailing)
- P/E TTM—
- EV/EBITDA TTM—
- EV/Revenue TTM—
- Price/FCF TTM—
- Gross Margin (TTM)25.1%
- EBITDA Margin (TTM)9.3%
- Net Margin (TTM)5.1%
- ROIC13.1%
- FCF Conversion55.4%
- SBC / Revenue1.1%
The Company
Limbach designs, delivers, and maintains mechanical, electrical, plumbing, and controls (MEPC) systems for mission-critical facilities. Its end markets include healthcare, industrial, data centers, life sciences, higher education, and cultural and entertainment. The work spans owner-direct service and specialty contracting, with the Owner Direct Relationships segment contributing 74% of Q2 2026 revenue. For AI infrastructure, the company is a specialty contractor and fabricator on data centers, and the CYMCOR acquisition adds early-lifecycle program management.
The company operates from 21 offices in the Eastern and Midwestern U.S. with about 1,500 team members. It owns one disclosed facility, a ~40,000-square-foot Woodbury, Minnesota site used for operations, fabrication, warehousing, and office purposes. Fabrication capacity, including Jake Marshall's ~14-acre facility, is described by management as excess, with a full-year capex run rate of about $5M.
Business Segments
Competitive Landscape
The source material does not provide named competitor commentary from filings. The financial facts block notes that several publicly traded competitors have similar capabilities and could step in within weeks, but no competitor is named by management or in the provided source documents. Execution speed, fabrication capacity, and owner relationships are the competitive levers, but Q2 margins show Limbach is not currently in the high-margin specialty-contractor cohort.
Supply Chain
Limbach sits between equipment suppliers and building owners, installing and maintaining MEPC systems. The source material does not provide direct supplier relationships; supply-chain names are inferred from ecosystem mapping, not company disclosure.
More on LMB: Earnings recap