Illumina’s recent results show a recovery in profit margins while sales have not.
Revenue in the latest year was $4.3B, down 0.7% from a year earlier, while operating margin reached +18.6% and net margin +19.6%. The company carries a $32.0B market cap and trades at a 37.6x P/E.
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The swing in profitability is large relative to the prior collapse. Operating margin swung by 37.6 percentage points and net margin by 47.5 points in the most recent annual period, a reversal from the deeply negative margins reported in 2023. Operating cash flow covered net income at 1.27x in the latest year, so the reported profits are at least accompanied by positive cash generation.
Illumina’s own scenario math produces very different outcomes depending on assumptions. One scenario assumes a modest revenue CAGR and keeps the current P/E; another assumes shrinking revenue and a lower exit multiple. The company’s sensitivity table shows most of the divergence comes from what multiple the market assigns to those earnings, not from wildly different revenue paths.
That is the core tension: the accounting and cash-meter say earnings recovered, and the share count fell 1.9% (diluted), which helps per-share results. But the top line has been essentially flat since its 2023 peak at $4.6B; year-end totals were $4.5B in 2023, $4.4B in 2024, and $4.3B in 2025. A lot of the valuation move is resting on margin leverage and the multiple, not accelerating sales.
Possible supports for margin durability include cost reductions, restored pricing, or a leaner cost base. The operating margin and net margin jumps, and operating cash flow exceeding net income, are consistent with those possibilities.
On the flip side, the company’s latest revenue change was negative, and Illumina sits at an EV/sales of 7.4x. A high multiple on a flat revenue stream means future returns are highly sensitive to small changes in growth and the exit multiple the market hands the stock.
Put simply: the market is paying up for profits that have reappeared; the revenue story has not. The company’s own scenarios show a wide range of outcomes driven mostly by the multiple applied to those earnings, which makes the headline valuation hinge more on market appetite for sustained margins than on top-line momentum.
Source: company filings and financial statements; revenue $4.3B, revenue YoY -0.7%, operating margin +18.6%, net margin +19.6%, P/E 37.6x, market cap $32.0B.