Smurfit WestRock’s stock did a little dance last week — from $43.69 on July 23 to $50.79 on July 28, then back to $47.52 on July 30 (-1.5%). The price action looks like a market trying to figure out a company that just got a lot bigger.
The headline is simple: revenue is now $31.2B (2025), up +47.7% year over year, but the business is less profitable on the margins. Gross margin is +19.4%, operating margin +5.5%, and net margin +2.2%. At the same time diluted shares increased +35.2% in the latest annual period — big growth, spread over many more shares.
The balance-sheet and valuation add a second tug. Market cap is $25.0B, enterprise value is $37.3B, and net debt is $12.3B. The P/E is 35.8x (a +92.7% premium to peers), while EV/sales is 1.2x (a -6.4% discount). Cash-flow yield is +13.6% compared with an earnings yield of +2.8% — lots of cash flow relative to reported earnings, but earnings per share have been diluted.
(embed: revenue trend)
Management’s filings show where the pressure points are. First, cash from operations slipped in the latest six-month snapshot.
"Net cash provided by operating activities decreased by $95 million , to $969 million in the six months ended June 30, 2026 , from $1,064 million in the six months ended June 30, 2025 , primarily due to a $106 million decrease in net income adjusted for non-cash items, primarily including depreciation, depletion and amortization , impairment of assets , cash surrender value increase in excess of premiums paid , share-based compensation expense , deferred income tax benefit , and pension and other postretirement funding more than cost ." (10-Q 2026-07-31)
That line says: even after the big revenue base, operating cash fell year over year in H1 — and non-cash adjustments were a meaningful part of the movement.
Revenue growth also has a currency and mix component, not just volume.
"This increase was primarily due to a net positive foreign currency impact of $315 million primarily due to the strengthening of the euro against the U.S. dollar, partially offset by a lower selling price mix of $67 million and lower volumes of $11 million." (10-Q 2026-07-31)
about $315 million of the gain came from FX; selling-price mix and volumes worked the other way. Growth on the top line isn’t all underlying demand.
And the merger itself shows up in financing costs.
"This increase was primarily due to the increased interest expense as a result of the acquisition of WestRock." (10-K 2026-02-27)
The deal that made the combined company much larger also raised interest expense — another reason margins and per-share profits look weaker than headline revenue suggests.
The company’s own scenario math shows how sensitive outcomes are: management’s bull and base cases assume revenue CAGRs of +32.2% and +30.0% respectively over the company’s two-year history inputs, while the bear case assumes +12.0% and a much lower exit multiple (18.6x vs 35.8x). That split in assumed multiples is the main reason the bull-to-bear gap is so wide.
So the clean tension here: Smurfit WestRock is now a much larger business on paper, with a cash-flow yield of +13.6%, but margins, interest costs and a big jump in share count have spread that cash and profit across more moving parts. The market is left to price a larger company with thinner per-share economics — which is why small changes in multiples or underlying volumes make such a big difference.
Operating cash flow declined to $969 million for the six months ended June 30, 2026, while reported revenue reached $31.2B for 2025. (10-Q 2026-07-31; 2025 annual figures)