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Rockwool B (ROCK-B.CO)
Materials · Stone-wool insulation (EUR reporter, DKK-listed B-share) · LTM Q1 2026 (continuing ops)
Analysis date: 2026-06-10
Price at analysis: €199.30
Method: mttssn_streamlined_v1
Conviction: MEDIUM
HOLD
Conviction: MEDIUM
ROCKWOOL B-share is the primary liquid instrument for Rockwool International A/S — same economics as ROCK-A.CO (1:10 vote ratio, post-2025 split; B = 1 vote, A = 10 votes; both trade near DKK 199-200). Global stone-wool insulation leader with durable energy-efficiency/fire-safety demand moat and world-class underlying returns (pre-Russia ROIC ~19%). Russia deconsolidated as discontinued operation from Q1 2026. On continuing ops: Adj ROIC 11.6% > 8% WACC, EP +EUR 116M. Mid capex-supercycle, fortress balance sheet — priced at ~1.9x IC on trough margins. HOLD/MED; base DKK 215.
Adj. ROIC
11.6%
WACC 8% → spread +3.6pp
Economic Profit
+€116M
+EUR 116M (continuing ops); pre-Russia ~19% ROIC; 8% WACC hurdle comfortably cleared
FCF Yield
0.2%
FCF suppressed by growth capex; capex-light phase will unlock ~EUR 400M FCF/year
Price / Target
€199 → €215
+8% base; HOLD
Revenue (LTM)
€3.6B
LTM continuing EUR 3,616M; Q1 2026 +2% local-currency organic
EBIT Margin
13.1%
Trough ~13% continuing; FY2026 EBIT margin guide 13-14%; normalised ~16-18% pre-Russia
EV / IC
1.91×
Enterprise value / invested capital
Net Debt
n/a
Fortress ~70% equity ratio; net debt EUR 306M (0.7x EBITDA); funds capex with internal cash
Thesis

ROCKWOOL B is economically identical to ROCK-A — both are Rockwool International A/S shares. The B-share (1 vote) is more liquid and the primary instrument for institutional investors; the A-share (10 votes) trades at a modest premium (~0.5%) for the voting rights. Post-April 2025 1:10 split, prices converge near DKK 199-200 per share.

The dominant FY event: ROCKWOOL lost control of its Russian business on 13 Jan 2026 (presidential decree → external administration), booking a EUR 392M one-off write-off and reclassifying Russia as discontinued operation. On a continuing-operations basis (removes the write-off AND Russia's recurring ~EUR 78M EBIT gone for good), adjusted ROIC = 11.6% > 8% WACC, EP +EUR 116M.

The company is mid-capex-supercycle — new plants in US (Statesboro, GA), India (Hyderabad), and Romania — depressing near-term FCF on a fortress 70%-equity balance sheet. The FY2026 EBIT margin guidance of 13-14% (vs LTM ~13%) confirms trough, not deterioration.

Valuation · reverse-DCF & scenarios

On adjusted continuing NOPAT, ROCKWOOL trades at ~1.9x invested capital / ~6% NOPAT-to-EV on trough margins. Revenue LTM continuing EUR 3,616M; Adj NOPAT EUR 371M; EV EUR 6,106M.

Base DKK 215 (roughly fair) on margin recovery toward 13-14% FY2026 guide. Bull DKK 255 if pricing increases stick and capex cycle delivers. Bear DKK 165 on construction-cycle weakness or energy-cost spikes. Note: targets in DKK (reporting currency EUR, but listed in DKK; current price ~DKK 199-200).

Market-implied growth
+8.9%
NOPAT CAGR over 5y the EV already requires
No-growth value / share
€24
12% of price; rest = priced-in growth
ROIC − WACC
+3.6 pp
ROIC 11.6% vs WACC 8.0% — positive = value creation
CAP (priced-in)
10.2 yrs
years of excess returns the price implies (fades to WACC)

The market pays today’s enterprise value for roughly 8.9% NOPAT growth over 5 years. The business earns 12% on capital against a 8% cost of capital (spread +3.6 pp); the no-growth value is €24/share (12% of price), so the rest is priced-in growth.

Scenario24m targetImpl. gUpsideProb.Driver
Bull€255≥11%+28%30%Pricing sticks; capex cycle delivers; margins recover; Russia loss absorbed
Base€215≥11%+8%45%Margin recovery toward 13-14% FY2026 guide; fairly valued at DKK 215
Bear€165≥11%-17%25%Construction-cycle weakness or energy-cost spikes; trough extended
Prob-weighted€214+8%100%Scenario-weighted expected value

Sensitivity — fair value / share at WACC × growth

WACC \ g0%3%5%8%10%15%
6.50%323537404248
7.25%272931333438
8.00% (base)242526282931
8.75%212223242426
9.50%191920202122

Green = fair value above the current price of €199.30. The reverse-DCF conclusion is dominated by WACC and growth — see the whole surface, not a single fair value.

Method & data. NOPAT €371, invested capital and ROIC 11.6% are observed (adjustments.json); WACC 8.0% and terminal g 2.5% are assumptions. EV→equity uses net debt €306. The model holds ROIC constant (no fade) over the explicit horizon; the CAP figure instead fades excess returns to WACC.

⤓ Download the full model (.xlsx) — formula-driven sheets; flex the blue input cells and the model cascades in Excel.

Key drivers

1. Energy-efficiency demand moat

Decarbonisation + fire-safety regulation drive structural stone-wool demand; ~22% gross margin pricing power.

2. Capex supercycle delivery

New US/India/Romania plants add future capacity; yield on investment as plants ramp.

3. Above-WACC returns on continuing ops

Adj ROIC 11.6% > 8% WACC, EP +EUR 116M; underlying ~19% pre-Russia.

4. Fortress balance sheet

~70% equity ratio — funds capex cycle and absorbed the EUR 392M Russia write-off.

Key risks
Conclusion

ROCKWOOL B and A are economically identical; B-share is more liquid. Wide-moat, world-class-underlying insulation leader navigating Russia exit and capex supercycle — quality intact (EP still +EUR 116M). Priced at ~1.9x IC on trough margins: fairly valued, not cheap. HOLD/MED; base DKK 215.

Accumulate on cyclical weakness rather than here; energy-efficiency demand moat and capex cycle are the long-term drivers.

Footnote evidence & sources

Every adjustment traces to the cited note/page in the source filing — click to open it there. Source reports archived locally.

Adjustment / figureValueSourceWhy mttssn treats it this way
Revenue (LTM continuing ops)3,616Main figures p.2 / IS p.9Q1 2026 report restates FY2025 to continuing operations: FY cont revenue 3,616. LTM = 3,616 − Q1'25 906 + Q1'26 906 = 3,616. Reconciles to annual-report revenue 3,877 (incl. Russia) minus Russia revenue 261 (note 1.5 / disc-op p.14).
Revenue (FY2025 incl. Russia)3,877Statement of profit and lossFull-year group revenue incl. Russia per the consolidated income statement; note 2.1 (p.129) splits Insulation 3,206 / Systems 671 external.
EBIT (LTM continuing ops)472Main figures p.2 / IS p.9FY cont EBIT 492; LTM = 492 − Q1'25 140 + Q1'26 120 = 472. Continuing-ops EBIT already excludes both Russia's EUR 78m operating EBIT and the EUR 392m value adjustment.
EBIT before Russia value adj (FY, incl. Russia)570Statement of profit and lossCompany's headline APM. Reported EBIT of 178 = 570 minus the 392m loss from value adjustment of the Russian business.
EBITDA (FY2025 group)864Key figures table p.3 / p.10EBITDA 864 MEUR = EBIT 570 + D&A 294. EBITDA margin 22.3% (down 2.1pp vs FY2024 24.4%). Confirmed independently: EBIT 864 − EBITDA bridge = D&A 294 (note 3.4).
Amortisation, depreciation & impairment (LTM cont)283note 3.4 p.138 (FY group 294)FY cont D&A 283 (group 294 minus Russia 11). LTM = 283 − 67 + 67 = 283. Group split (note 3.4): intangibles 25 + PP&E 239 + ROU 30 = 294, of which ~22 is one-off factory-closure impairment.
Capex — gross PP&E investment (FY2025)4865-yr overview p.10 / note 3.2 p.135Gross investment in PP&E EUR 486m (additions, note 3.2). Cash-flow purchase of PP&E was 461 (p.121). Press-release headline capex EUR 473m. vs D&A ~283 => heavy growth capex; EUR 520m tangible assets under construction.
Goodwill (FY2025)114Statement of financial position / note 3.1 p.134Goodwill carrying amount EUR 114m (Insulation CGUs 89 + Systems 25). China/Yangzhou goodwill of 5 fully impaired in 2025 after factory closure (note 3.1 / 3.5).
One-off: Russian value adjustment (FY2025)392note 1.5Loss from value adjustment of the Russian business EUR 392m = full impairment of net assets 475 offset by intra-group loan liability 83. Excluded from adjusted figures via the continuing-ops basis (sits in discontinued operations).
One-off: factory-closure impairments (FY2025)22note 3.2 p.135 + note 3.1 p.134PP&E impairment 16 (Norway + China factory closures) + goodwill 5 (China) + customer relationships 1 (China) = 22. Normalized as non-recurring add-back to adjusted EBIT.
Lease liability (FY2025)82note 3.3 p.136Lease liabilities non-current 49 + current 33 = 82 (ROU assets 79). Q1 2026 ROU 76 => lease liab ~79. EXCLUDED from IC (peripheral offices/warehouses/vehicles, ~3% of operating assets).
Interest-bearing debt (Q1 2026)434p.5 net debt + p.10 BS / FY note 5.4 p.150Q1 2026 net IB debt EUR 306m (p.5, leverage 0.4) + cash 207 = gross IB debt incl. leases 513; less lease liabilities ~79 = 434 borrowings/bank debt.
Cash and cash equivalents (Q1 2026)207Statement of financial positionCash EUR 207m at 31 Mar 2026 (elevated by pre-funding the April 2026 dividend). Operational cash = 2% × revenue = 72.3; excess cash 134.7 subtracted from IC.
Total equity (Q1 2026)2,828Statement of financial positionEquity attributable to shareholders EUR 2,828m (share capital 28, FX translation −22, proposed dividend 118, retained earnings 2,705, hedging −1); NCI 0. accumulated_oci = −22 − 1 = −23 stripped => equity_ex_oci 2,851.
Tax (normalized effective rate)0.25note 6.1Effective tax rate BEFORE the Russian value adjustment = 25.0% (Danish statutory 22.0% plus non-Danish mix). Reported all-in rate 85.5% is distorted by the largely non-deductible 392m Russian write-off (+60.5pp). LTM continuing-ops tax expense = 115 (FY 118 − Q1'25 32 + Q1'26 29).
Analysis history

How the mttssn view has evolved — each prior dated note is preserved.

Quality · Buffett tenets10 / 15
Understandable business
World stone-wool insulation leader — fire-safe, energy-efficient building insulation and systems; capital-intensive manufacturing, legible.
Durable moat
Structural energy-efficiency/decarbonisation + fire-safety demand, scale melting furnaces and ~22% gross-margin pricing power — a real, if cyclical, edge.
Able & honest management
Reinvestor with a fortress 70%-equity balance sheet, mid-capex-supercycle (new US/India/Romania plants); navigated the forced loss of the Russian business cleanly.
Financial strength
Continuing adjusted ROIC ~11.6% > 8% WACC, EP +EUR 116M; underlying pre-Russia ROIC was world-class ~19% — genuine value creation, capex depresses near-term FCF.
Margin of safety
At ~1.9x invested capital / ~6% NOPAT-to-EV on trough margins, the valuation already capitalises the quality — limited cushion.