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Rockwool tops EUR 1 billion in Q2 revenue as costs bite. The Danish stone wool insulation maker cleared EUR 1 billion of quarterly revenue on 10% growth, but volume-led gains ran into cost inflation and full plants - and the OTC line fell almost 5%. Rockwool AS (RKWBF) told investors on its Q2 2026 earnings call that revenue rose 10% to more than EUR 1 billion on stronger volumes and market share gains, while flagging rising costs and capacity constraints; the over-the-counter listing was quoted at 29.45, down 4.97%, at 17:46 GMT on 20 August 2026. Rockwool AS (OTC: RKWBF) used its second-quarter 2026 earnings call to report a milestone that has been coming for several quarters: revenue above EUR 1 billion, up 10% on the prior year, delivered by higher volumes and share taken from competitors rather than by price increases. The Danish maker of stone wool insulation also spent a good part of the call describing the two things standing between that top line and an equally clean bottom line - cost inflation and plants running close to full. The market's reaction was not celebratory. The company's over-the-counter line in the United States was quoted at 29.45 as of 17:46 GMT on 20 August 2026, down 4.97% from the previous close of 30.99, with the day's range showing a single traded level - a reminder that the OTC quote is a thin, secondary venue for a stock whose primary liquidity sits on its home exchange in Copenhagen. Volume-led growth is a different animal from price-led growth. The distinction matters more than the headline percentage. Building materials companies spent much of the post-pandemic period growing revenue by passing energy and freight costs through to customers. That kind of growth flatters the income statement while units shipped stand still or fall. What Rockwool described on this call was the opposite composition: strong volumes, plus market share gains, adding up to 10% growth and a record quarterly figure of more than EUR 1 billion, as reported by GuruFocus. Volume growth is the harder and more durable version. It implies end demand - renovation activity, new build, industrial and technical insulation - is absorbing product, and that Rockwool is taking a larger slice of whatever demand exists. Share gains in insulation typically come from three places: substitution away from competing materials such as glass wool or foam boards on fire-performance grounds, distribution wins that lock in specification, and geographic reach where a nearby plant beats a distant one on freight. The company did not break the gains down further in the material available, but any of those routes tends to be sticky once won, because insulation is specified into a building design well before it is bought. Why full factories are a problem worth having - and still a problem. Capacity constraints were flagged alongside the growth, and the two are related. Stone wool is made by melting rock in furnaces that run continuously; you cannot flex output up for a strong quarter and back down for a weak one the way an assembly line can. When demand outruns installed melting capacity, the options are to prioritise higher-value products, to ship from further away at worse freight economics, or to turn business down. Each of those has a margin consequence. Prioritisation protects mix but caps volume. Long-haul shipping protects volume but eats the gross margin on the units shipped. Turning business away protects margin per unit but hands share back to the competitor who has the spare furnace. A company that has just told the market it is winning share is unlikely to choose the third option, which is why the strategic expansion mentioned on the call - new and expanded capacity - is the natural response rather than a discretionary growth ambition. The catch is timing. Melting capacity takes years and heavy capital to bring on. In the gap between demand arriving and the furnace lighting, revenue can grow faster than profit, and free cash flow can compress as capital expenditure runs ahead of the earnings the new lines will eventually produce. What cost inflation does to a 10% top line. Rising costs were the second constraint named. For a stone wool producer the cost base is unusually concentrated in a few line items: energy to run the furnaces, raw rock and binders, freight to move a bulky low-density product, and labour. Energy alone can swing an insulation manufacturer's gross margin by several points without a single unit of volume changing hands. Energy alone can swing an insulation manufacturer's gross margin by several points without a single unit of volume changing hands. Ten percent revenue growth built on volume is well suited to absorbing that, because incremental volume through an already-paid-for plant carries high contribution margin. But that logic only holds while there is headroom in the plant. Once the furnaces are full, additional volume arrives through more expensive routes - a further plant, a longer haul, overtime - and the operating leverage that makes volume growth so attractive begins to fade. Read together, "record revenue", "capacity constraints" and "rising costs" describe a company at exactly that inflection. The share reaction and what it may be pricing. A near-5% fall on the day of a record revenue print suggests investors focused on the qualifiers rather than the headline. It also came on a broadly weak session for equities: the S&P 500 tracker (SPY) was at $764.63, down 0.58%; the Nasdaq 100 tracker (QQQ) at $710.89, down 0.72%; and the Dow tracker (DIA) at $528.86, down 1.01%, all as of 17:46 GMT on 20 August 2026. Rockwool's decline was meaningfully steeper than any of those benchmarks, so index weakness explains only a fraction of it. US investors should treat the OTC quote with care. RKWBF is an unsponsored-style over-the-counter representation of a Danish-listed company that reports in euros. The quote can lag the home market, can carry wide spreads, and moves with the euro-dollar rate as well as with the underlying shares. A single-price day range, as seen here, is a classic marker of low turnover. What to watch from here. * Margin, not revenue, in the next print. The revenue trajectory is established. The open question is how much of the 10% growth survives the trip down the income statement once energy, freight and start-up costs are deducted. * Capital expenditure disclosure. The size and phasing of the expansion programme determines how long free cash flow stays compressed and when the new capacity starts contributing. * Whether share gains persist. Gains taken while the industry is capacity-tight are the easiest to lose when competitors' new lines come on. * Regional demand mix. European renovation activity, driven by energy-efficiency policy, behaves very differently from new residential construction. The balance between them shapes both volume and pricing power. For now, the reported facts are narrow but pointed: a record quarter above EUR 1 billion, 10% growth of the better kind, and a management team saying in the same breath that its costs are climbing and its plants are full. Key facts. * RKWBF price: 29.45, -4.97% (as of 17:46 GMT, 20 Aug 2026) * Q2 2026 revenue: More than EUR 1 billion, a record * Revenue growth: 10% year over year, volume- and share-led * Flagged headwinds: Rising costs and capacity constraints Frequently asked questions. What did Rockwool report for the second quarter of 2026? Rockwool AS reported revenue growth of 10% year over year, taking quarterly revenue above EUR 1 billion for a record result. Management attributed the growth to strong volumes and market share gains rather than pricing, while also flagging rising costs and capacity constraints on its earnings call. How did RKWBF shares trade on the day of the report? The over-the-counter listing was quoted at 29.45 as of 17:46 GMT on 20 August 2026, down 4.97% from a previous close of 30.99. The day's range showed a single traded level, which is typical of a thinly traded OTC line for a company whose primary listing is overseas. Why is volume-driven growth considered better than price-driven growth? Price-led growth usually reflects passing input costs to customers and can mask flat or falling units shipped. Volume-led growth means more product is actually being sold, which indicates real end demand and, in manufacturing, drops through at high contribution margin as long as there is spare capacity in existing plants. Why do capacity constraints matter for an insulation maker? Stone wool is produced in continuously running melting furnaces that cannot be flexed up quickly. When demand exceeds installed capacity, a producer must prioritise higher-value products, ship from more distant plants at worse freight economics, or turn business away - each option costing either volume, margin or market share. What costs weigh most on a stone wool producer? The cost base is concentrated in energy to run melting furnaces, raw rock and binder inputs, freight for a bulky low-density product, and labour. Energy in particular can move gross margin materially without any change in volume, which is why cost inflation was singled out alongside the record revenue figure. What should investors watch in Rockwool's next results? The key items are margin rather than revenue, since the growth trajectory is established; the scale and timing of capital expenditure on new capacity, which determines how long free cash flow stays compressed; whether recent market share gains hold once competitors add capacity; and the mix between renovation and new-build demand.

ROCKWOOL has raised its 2026 revenue growth outlook to 5-7% from 3-6% previously, citing broad-based sales momentum. The insulation manufacturer also increased its expected investment level to around €750 million from €700 million, excluding acquisitions. The Danish company reported record second-quarter revenue of €1 billion, representing 10% growth in local currencies year-on-year. First-half revenue reached €1.906 billion, up 6% in local currencies. Second-quarter EBIT rose 3% to €129 million, with margins at 12.9%. First-half EBIT reached €249 million with a 13.1% margin. ROCKWOOL maintained its full-year EBIT margin outlook at 13-14%. The company attributed growth to volume increases and market share gains, though North American sourcing constraints are expected to partially limit expansion.