WESTERN DIGITAL CORP (WDC) stock intrinsic value fair value estimate & owner earnings analysis

The business. Since spinning off its flash memory business (Sandisk) on February 21, 2025, Western Digital is a pure hard disk drive (HDD) maker. In fiscal 2026 (the year ended July 3, 2026) revenue was $12.9 billion, up 36%. Cloud customers (hyperscale data centers and the new "neocloud" AI operators) bought 89% of it: exabytes shipped rose 25% and the price per exabyte rose 8%. Client and consumer drives make up the remaining 11%. Gross margin reached 48.9%, against 38.8% in fiscal 2025 and 24% to 29% for the HDD business between fiscal 2021 and fiscal 2024. Customers are now concentrated. Three of them supplied 16%, 15% and 13% of fiscal 2026 revenue, and the top ten supplied 73%. Western Digital has multi-quarter and multi-year supply agreements with some of these customers. The company reports the remaining contracted value as not material, though, so we do not treat the agreements as locked-in revenue. Earnings history and the accounting judgements. We measure owner earnings as operating cash flow, excluding working-capital swings, minus stock compensation and the capital spending needed to maintain the business. Before 2025 the reported figures combine HDD and flash, so they describe a different company. For the HDD business alone we estimate cash earnings before interest of roughly -$0.55 billion in fiscal 2023 and -$0.07 billion in fiscal 2024, the trough of a cloud inventory digestion in which HDD revenue fell 31%. We estimate about $2.1 billion in fiscal 2025, after removing Sandisk's results for the months before the spin-off and a $198 million one-time litigation reversal, and $4.3 billion in fiscal 2026. Fiscal 2026 net income of $9.4 billion is not a measure of the business. It includes a $6.5 billion gain on the leftover Sandisk shares, which were used to retire debt and buy back stock, and about $0.9 billion of non-cash exchange costs. We excluded both. The fiscal 2025 deferred tax benefit of $690 million from an internal asset transfer was also excluded, because it is not cash. Taken from the 2023 trough to the 2026 peak, the median is only about $1 billion a year. However, six consecutive quarters at much higher margins, with cloud now 89% of sales, support a higher mid-cycle level. We set it at about $2.2 billion a year: revenue of around $11.5 billion at a 38% gross margin, with operating costs near today's $1.75 billion. That is well below fiscal 2026 and well above the old-normal HDD economics. Business cash flow grew about 100% in fiscal 2026. The base case assumes no growth in fiscal 2027. That assumption is backed by the fourth-quarter revenue of $3.75 billion, which was above the fiscal-year average, and by the supply agreements. Growth credited. None. Industry exabyte demand has grown for many years, but that is market expansion rather than something Western Digital has secured. Price-per-exabyte increases have historically reversed. Neither is counted. Revenue stays flat across all three cases apart from the cycles. Base case (about $60 per share). Fiscal 2027 business cash flow stays near $4.3 billion and fiscal 2028 eases to $3.3 billion as pricing normalises. A hyperscaler digestion in fiscal 2029 cuts it to about $1.0 billion. The business then recovers to the $2.2 billion mid-cycle level, with a second, milder dip around fiscal 2033. After year ten, earnings fade to zero over fifteen years. Two things keep the business going until then. Hard drives are still several times cheaper per terabyte than flash for bulk storage, which is why hyperscalers bought record HDD volumes in 2026 despite decades of predicted substitution. And Western Digital spends about $1.16 billion a year on R&D to keep raising drive capacity. We do not assume the cost advantage lasts forever. The business is worth about $23.6 billion against roughly $0.5 billion of net debt, which leaves about $23.1 billion, or $60 per share on 383 million diluted shares. Bear case (about $22 per share). This case repeats the fiscal 2023 cycle at today's scale. Fiscal 2027 is softer at $3.4 billion. The case then runs through a fiscal 2028 to 2030 downturn in which revenue falls about 30% and gross margin returns to the high-20s, as it did in 2023. Cash flow goes from $0.6 billion to a -$0.5 billion trough, then to zero, matching the fiscal 2023 to 2024 experience. A second downturn follows around fiscal 2033. Mid-cycle cash flow settles at only $1.1 billion, a return to the pre-AI margin structure, with quad-level-cell flash taking share in data centers. Earnings fade to zero within eight years after fiscal 2036. This case also pays the $316 million SPEX patent judgment. That judgment is under appeal and the company has not accrued it. The business is worth about $8.8 billion, less $0.5 billion of net debt, leaving about $8.3 billion, or $22 per share. Bull case (about $107 per share). The fourth-quarter run rate holds into fiscal 2027 at about $4.8 billion. Higher-capacity drives keep gross margin in the mid-40s through a mild fiscal 2029 dip. Mid-cycle cash flow is about $3.6 billion and holds five years beyond year ten before fading over ten. The business is worth about $41.4 billion, less $0.5 billion of net debt, leaving about $40.9 billion, or $107 per share. Debt. The balance sheet was transformed in fiscal 2026. Western Digital used Sandisk shares in tax-free exchanges to retire its term loan and a bridge loan, and it redeemed all of its senior notes. At July 3, 2026, borrowings were $710 million of 3% convertible notes due November 2028 and $350 million drawn on a revolving credit facility maturing January 2027. Cash was $1.58 billion. The convertible notes are far in the money, and conversions are being settled with cash for principal and shares for the excess. We therefore count the $710 million principal as debt and include the extra shares in the 383 million diluted count. We treat about $1 billion of cash as needed to run the business, which gives net debt of about $0.5 billion. Debt service is now small, and even the bear-case trough can be funded from existing cash. Debt is not what drives the risk here. What could make this wrong. The main risk is the cycle. HDD earnings went from roughly breakeven to $4.3 billion in two years, and they can go back as fast if the three largest customers pause purchases at the same time. Flash substitution in data centers would shorten every case. The $316 million SPEX judgment could still become payable. On the other side, a mid-cycle margin nearer the last six quarters than our 38% would put the value well above the base case. Margin-of-safety price: $30. We are confident about the current earnings level but not about the normal one. Fiscal 2026 is clean, standalone HDD cash flow. The history, though, shows this business swinging from losses to record profits within three years, so we cannot be sure where the mid-cycle settles. The worst plausible outcome is a repeat of 2023 combined with lasting flash substitution. With almost no net debt, the company would survive that. With 44% of revenue coming from three customers, though, a downturn would be sudden and deep. Suppose we are wrong about the mid-cycle margin, and it returns to the old 30%-or-lower economics after two more strong years. The shares would then be worth roughly $40. In the full bear case they would be worth about $22. At $30, the two strong years in the base case alone (about $7.6 billion, or roughly $20 per share) would equal around two-thirds of that price in cash within two years. Most of that cash is currently going to share repurchases and a dividend of about $0.50 a year. The shares would still hold most of their value if the old economics come back. Above roughly $30, a 2023-style downturn arriving early would make a 20% annual return unlikely. Change since the previous analysis. Our earlier estimates were built on a different basis and are not comparable with these figures.