A viral margin chart, and where it gets complicated
A chart ranking semiconductor companies by margin made the rounds on social media this week. It put Micron (MU) on top with a 66% operating margin, Nvidia (NVDA) second at 64%, and Western Digital (WDC) tucked into a middle "Strong" tier at 30%.
The top three names check out on an operating-margin basis. But operating margin only tells part of the story. Run the same list through Stoxcraft's own net profit margin data, and the order changes. Nvidia moves into first place. Western Digital jumps from the middle of the pack to third overall.
Why Nvidia edges out Micron when you look at net margin
The 10-point gap that flips the ranking
Nvidia's operating margin (64%) and Micron's (66%) look nearly identical on a single chart. Once taxes and non-operating costs are factored in, Nvidia converts more of that operating profit into net income. On Stoxcraft's own data, Nvidia comes out on top of the full 19-name screener at 63.0%. Micron drops to 55.9%, a 10-point swing from its widely-shared operating figure and the largest gap of any name on the list.
That gap matters. Operating margin measures what a company keeps before the tax bill and non-operating items arrive. Net profit margin measures what actually reaches the bottom line. Same company, same quarter, two very different numbers depending on which line of the income statement you read.
Taiwan Semiconductor shows what consistency looks like
Taiwan Semiconductor (TSM) tells a different story. Its operating and net margins stay close together, 53% and 47.0% respectively, a spread of just 6 points. That consistency signals a business with fewer non-operating swings distorting the bottom line. TSM's profitability is less sensitive to one-off items than either Nvidia's or Micron's, which is its own form of quality.
None of this makes Micron a weaker business. A 55.9% net margin is still elite by any standard. It just means the viral chart's "best-in-class" framing, based on operating margin alone, missed which company actually keeps more of every dollar earned.
Western Digital: the name the original ranking undersold
The bigger surprise sits further down the original post. Western Digital was placed in a "Strong (30-39%)" tier based on a 30% operating margin, solid but unremarkable next to the chip leaders above it.
Stoxcraft's net margin data tells a different story. Western Digital's net profit margin comes in at 55.1%, the third-highest figure across all 19 names screened, just behind Nvidia and Micron and ahead of Taiwan Semiconductor.
The gap between Western Digital's operating and net margin is unusually wide for a storage hardware name. It points to a company whose bottom-line profitability, likely helped by favorable tax treatment or gains outside core operations, is not fully captured by the operating-margin lens the original chart used. Investors screening purely on operating margin would have ranked Western Digital well behind where its actual profit conversion places it.
The full screener: 19 semiconductor names by net margin
Here are all 19 names from the original viral post, ranked by Stoxcraft's net profit margin TTM data from highest to lowest:
One name from the original viral chart is missing here on purpose. SK Hynix (SKHY) raised $26.5 billion in its Nasdaq debut on July 10, 2026, the largest-ever US listing by a foreign company. It's too new to have Stoxcraft coverage yet, so it's excluded from the ranked screener above rather than estimated.
Operating margin vs. net margin: two numbers, one company
What each metric actually measures
Operating margin tracks what a company keeps from its core business, before taxes, interest, and one-off items enter the picture. Net profit margin tracks what lands on the bottom line after all of that. Same revenue. Different endpoints.
The two numbers usually move together. When they diverge sharply, as they do for Micron and Western Digital, the gap is telling you something specific. Tax structure, one-time gains, interest expense, and non-operating income can all widen or narrow that distance in either direction.
Why a single-metric ranking always has a blind spot
Pick operating margin and you miss Western Digital's bottom-line conversion. Pick net margin and you lose some of the signal on core business efficiency. Neither figure is wrong. Both are incomplete on their own. A complete picture of semiconductor profitability requires at least two lines of the income statement, not one.
What Nvidia's 63% says about semiconductor profitability in 2026
The real lesson from this week's viral chart isn't that it was wrong. The top three names it flagged, Micron, Nvidia, and Taiwan Semiconductor, are legitimately among the most profitable semiconductor companies tracked anywhere. The lesson is that the same companies rank differently depending on which line of the income statement you measure.
Nvidia's net margin lead and Western Digital's under-the-radar third-place finish are the two numbers worth keeping from this. For a broader look at how the AI buildout is reshaping profitability across the chip sector, see Stoxcraft's earlier coverage of the chip boom.
