SIGMAROC PLC (SRC) — Investment Research Note

Executive summary

SigmaRoc is a European lime and industrial limestone producer with 2.7bn tonnes of reserves across ~70 kilns and 15 countries, serving industrial (36% of H1 2026 rev), environmental (22%) and construction (42%) end markets. The Group has transformed since 2024 via the £1bn CRH lime carve-out, and H1 2026 confirmed the operating leverage thesis: core volumes finally turned +1% YoY after three flat/down years while underlying EBITDA rose 11.3% on just 2.5% revenue growth, with margin expanding 200bps to 25.1% and covenant leverage falling to 1.66x. The single most important valuation point is that this is a compounder in a cyclical trough — margins, ROIC (11.8% LTM, targeting 15%) and deleveraging are all improving before the residential/German-stimulus cyclical tailwind properly arrives.

Fair value estimate

Methodology: Blended EV/EBITDA and P/E on FY26 consensus, cross-checked against sector peers.

• FY26 consensus (per company disclosure): revenue £1,066m, underlying EBITDA £276m, underlying EPS 11.5p, leverage 1.4x
• Net debt H1 2026: £462.6m
• Applied EV/EBITDA 8.0–9.0x on £276m → EV £2,208m–£2,484m → equity £1,745m–£2,021m
• Applied P/E 13–15x on 11.5p → 150p–172p
• Peer context: CRH ~10–11x, Holcim ~7–8x, Heidelberg Materials ~5–6x — SRC deserves a mid-to-upper valuation given best-in-class ESG rating, lime-heavy mix (higher-margin than commodity aggregates), and clear synergy/margin runway

Fair value range: 155p – 180p per share, mid ~168p Implied market cap range: £1,748m – £2,030m (mid ~£1,895m) Current mcap £1,423m → absolute upside ~33% to mid, range +21% to +40%

Sector context

Confirmed classification: Construction and Materials / Industrials. But SRC is atypical — lime is a chemically essential input to steel, pulp & paper, water treatment, agriculture and DAC/carbon capture, not primarily a construction commodity. Quality (25% EBITDA margin, 12% ROIC) sits above sector peers who mostly deliver 15–20% margins on aggregates/cement. Growth profile is above sector, leverage below CRH/Heidelberg. Nearest listed comparators: CRH (former owner, US-focused now), Holcim (aggregates/cement giant), Heidelberg Materials. Lhoist (Belgian) is the closest pure-play lime peer but is private.

Investment thesis (3 bullets)

• Operating leverage inflection is visible now. H1 2026 delivered +2.5% revenue → +11.3% EBITDA (4.5x drop-through), with core volumes positive for the first time in three years and 200bps margin expansion driven by pricing, cost control and €45m of delivered synergies from the CRH deal 2026-09-07 interim results. Kilns have very high fixed-cost bases so incremental volume drops disproportionately to profit.
• Structural + cyclical tailwinds are stacking. Management explicitly cites European re-industrialisation (steel, tariffs), German infrastructure stimulus, defence spend, energy transition, and — importantly for this investor — "increasing AI and data-centre investment" and "requirements for power, energy storage infrastructure, battery production and related metals" driving lime demand 2026-09-07 interim results. Belgian aggregates plant being commissioned specifically targets data-centre projects.
• Balance sheet and capital allocation are strong and improving. Covenant leverage 1.66x (target 1.4x by year-end), refinanced onto €825m investment-grade RCF at EURIBOR+150bps, AAA MSCI ESG rating, ROIC 11.8% (up 50bps YoY), FCF conversion 51% 2026-09-07 interim results. €110m Dolomitas acquisition (Lithuania, 25%+ EBITDA margin) announced same day is earnings-enhancing 2027 — disciplined bolt-on M&A continues at attractive multiples.

Key risks (3 bullets)

• Cyclical residential construction remains subdued and the German stimulus timing is uncertain — the recovery thesis is partly bought on expectations that may slip 2026-09-07 interim results. UK residential is called out as still weak.
• Swedish Klinthagen permit appeal. Two environmental groups have requested leave to appeal the 64m-tonne limestone permit to the Swedish Supreme Court; the Klinthagen operation supplies Scandinavian industry so an adverse outcome would hit a strategic asset 2026-09-07 interim results, note 8.
• Energy/Middle East cost exposure. Kilns are energy-intensive; management calls out ongoing watchfulness on Middle East conflict and energy costs. Hedges and pass-throughs mitigate but do not eliminate — a coal or gas shock would compress margins for 1–2 quarters before contractual pass-through catches up 2026-09-07 interim results.

Operating leverage

SigmaRoc's cost base is materially fixed: kilns (70 of them) carry high fixed depreciation, maintenance and labour whether they run at 70% or 95% utilisation; quarry overheads are largely fixed; corporate cost is fixed and modest (£15m/yr). Only raw energy, distribution, and some raw materials scale with volume. This shows up cleanly in the numbers: H1 2026 revenue +2.5% delivered EBITDA +11.3% (4.5x leverage ratio) and EBIT +3.9% underlying 2026-09-07 interim results. Historically, the CRH synergy programme lifted Group EBITDA from £238m at acquisition to £262m at FY25 while absorbing £17m of volume-related EBITDA loss — synergies alone offset a demand-side headwind. On my read, a 10–15% revenue surprise (plausible if German stimulus lands + residential recovery + AI data-centre construction accelerates) would drive £30–50m of incremental EBITDA (~10–20% uplift on the consensus £276m), given ~60–70% incremental contribution margin on volume. Not quite software-like (where you'd double profit) but a genuine industrial leverage story. Capacity utilisation is described as having room ("well placed to capitalise when growth returns driven by capacity optimisation across various products") 2026-03-16 FY25 results.

Value-trap signals

None identified. Revenue is growing, margin is expanding, leverage is falling, ROIC is rising, dividends have not been cut (Group hasn't started paying), management team is stable, no restatements or accounting concerns flagged by auditor, MSCI upgraded to AAA. Only mild watch-item is the still-large intangibles/goodwill (£473m) inherited from acquisitions — but PPAs are complete and reviewed.

Earnings vs expectations

Consistent beats across the period reviewed:

• FY23 (Mar 2024): Underlying EBITDA ahead of consensus (£110.2m expected; delivered £116.7m).
• FY24 (Mar 2025): Underlying EBITDA ~2% ahead of £221m consensus, EPS ~10% ahead (7.6p expected; 8.35p delivered).
• FY25 (Mar 2026): EBITDA ~5% ahead of £250m consensus (£262m delivered); EPS ~8% ahead (9.7p expected; 10.51p delivered).
• H1 2026 (Sep 2026): In line with full-year consensus reiterated; margin ahead. Pattern: consistent modest-to-material beats on EBITDA/EPS driven by synergy over-delivery and cost control; volumes typically at or slightly below plan but pricing and mix cover. No misses in the covered period.

Conviction: 4 — high

Anchors: (1) Two independent methodologies (EV/EBITDA 8–9x and P/E 13–15x) converge on ~150–175p; (2) consistent 3-year track of beating consensus EPS by 8–12%; (3) clean disclosure, IFRS accounts, investment-grade refinance completed, MSCI AAA. Caveats: (1) The upper end of my range assumes the German/European cyclical recovery materialises — if it slips 12–18 months, fair value compresses toward ~150p; (2) forward multiples in construction materials are historically volatile and can rerate down 2–3 turns in a downturn.

Overall score rationale: SRC is a fair-to-cheap, high-quality European lime compounder with genuine operating leverage and modest indirect AI-receiver exposure via data-centre construction materials demand. AI is a tailwind, not the thesis — the primary drivers are cyclical recovery, synergy delivery and disciplined M&A. Valuation is reasonable (EV/EBITDA ~6.8x on FY26 consensus vs peers 7–11x), balance sheet is strong (1.66x, going to 1.4x), and management has a nine-year track record of EPS growth. Doesn't top-tier fit the AI-receiver criterion (the "AI value" flows to NVIDIA-type names, not to the concrete/lime supplier), but scores well on the other three pillars — valuation discipline, downside protection, and moderate operating leverage — putting it in the middle-upper of the 400–599 "partial fit" band.