Clearwater Paper shares fell 19.9% on 2026-10-27.

What the company reported

In its third-quarter release, Clearwater Paper reported net sales of $385 million, down from $399 million a year earlier, primarily because of lower market pricing. Adjusted EBITDA from continuing operations was $24 million, compared with $18 million in the prior-year quarter. The company attributed the increase mainly to the timing of planned maintenance at its Lewiston facility, partly offset by lower sales prices. Those results offer a mixed signal: the adjusted measure improved, while sales remained under pressure.

The operational disclosure is more directly relevant to the fall. Chief executive Arsen Kitch said the Augusta disruption negatively affected volumes and costs late in the quarter. The company said the problems continued into October as it worked to return the mill to normal operations. A report on the earnings call also highlighted the disruption’s effect on guidance. That interpretation is consistent with the company’s disclosure, but it remains a report’s reading of the results rather than confirmation of why investors sold.

There were offsets. Clearwater said average selling prices improved by $34 per ton from the second quarter, helped by previously announced price increases and sales mix. It also reported adjusted EBITDA within the prior guidance range, according to a report published before the session. The company said it had refinanced its debt, extending maturities, and received additional insurance proceeds. These developments may have tempered the pressure, but they do not remove the near-term uncertainty around mill operations.

How unusual the fall was

The decline was 6.0x a typical daily move for Clearwater Paper over the past year, when its typical move was 3.3%. It was the stock’s largest fall since 7 August 2024. Trading volume was 1.4x its 30-day average, indicating heavier activity than usual.

The move does not look like a broad market decline. The S&P 500 rose 0.3% in the same session, while the median move among covered paper and packaging companies was −0.2%. That divergence is consistent with a company-specific reaction, although it cannot identify which disclosure investors weighed most heavily.

Clearwater closed at $15.39, compared with a previous close of $19.22. The company’s trailing revenue growth was −3.2%, and its trailing operating margin was −1.6%. Those figures give context for the business: the mill disruption landed while revenue was shrinking and operating results remained negative on a trailing basis.

What it means for value

The disruption matters to a cash-flow model through operating performance. Under the model’s stated assumptions, a −38.9% change in model value corresponds to a one percentage-point lower free-cash-flow margin. A five percentage-point reduction in growth changes model value by −47.7%; a five percentage-point increase changes it by 62.7%. A one percentage-point higher discount rate changes model value by −26.9%.

The company’s improving prices and adjusted EBITDA point to possible offsets if they persist. The reported continuation of Augusta’s operating issues points the other way. These are model values under stated assumptions, not a comparison with the share price.

What comes next

The available information does not establish a later reporting date. For now, the evidence supports a likely company-specific catalyst in the mill disruption and the pressure on sales, while the precise reason for the market’s reaction remains unconfirmed.