The long-term HDD thesis remains unchanged; WDC's weaker near-term execution represents a temporary setback

Overview

The report views WDC's F4Q26 performance as a relative temporary setback rather than a reversal of the HDD industry upcycle thesis. The company's nearline HDD capacity growth, pace of cost reduction, and gross margin expansion all lagged STX, widening the near-term execution gap; however, tight nearline supply, continued price increases, higher penetration of high-capacity products, and AI-driven storage demand still support upward earnings revisions. Morgan Stanley therefore maintains its Overweight rating and raises the price target, while continuing to tactically prefer STX until WDC proves it is reaccelerating.

Core views

First, HDD industry supply-demand remains strong, with nearline supply expected to be sold out through CY28; prices and margins have not yet peaked, and consensus expectations remain conservative. Second, WDC's nearline capacity grew 23% YoY this quarter, significantly behind STX's 42%, mainly affected by customer procurement timing and the 40TB ePMR product transition, and is expected to recover to above 30% from late 2026 to early 2027. Third, WDC's cost reduction and gross margin improvement have been slower than STX's, but September-quarter gross margin guidance may be conservative, with actual gross margin potentially reaching 57% to 58%. Fourth, price per EB gains are accelerating and sustainable, with YoY growth expected to be no less than 20% over the next eight quarters. Fifth, earnings forecasts were raised by 4% to 5%, lifting the price target to $676 at an unchanged valuation multiple, but execution verification over the next 90 days is crucial.

Analysis framework

The report's conclusions combine analysis of quarterly results and guidance differences, peer comparison between WDC and STX, breakdowns of nearline HDD capacity and unit costs, price-per-EB trends, product transition progress, and scenario valuation. Valuation is based on CY27 earnings and uses bull, base, and bear scenarios to test the impact of changes in demand, pricing, gross margin, and technology roadmap on the share price.

Methodology notes

• Financial forecasting frameworkMorgan Stanley ModelWare

  Standardized earnings forecasts

  Unless otherwise specified, the financial metrics and earnings forecasts in the report are based on the Morgan Stanley ModelWare framework.

• Relative valuationP/E valuation method

  Target P/E multiple multiplied by expected earnings per share

  The base-case price target of $676 corresponds to 20.0x CY27 EPS of $33.80, with the valuation multiple consistent with the STX target multiple.

• Scenario analysisBull-base-bear scenarios

  Sensitivity analysis of demand, pricing, margins, and valuation multiples

  The report provides three scenario values of $980, $676, and $322 to gauge the impact of changes in AI demand, pricing, product mix, gross margin, and technological progress.

• Peer comparisonExecution comparison between WDC and STX

  Comparison of capacity growth, cost reduction, and gross margin expansion

  By comparing the two companies' nearline capacity growth, unit cost declines, and gross margin performance, the report evaluates WDC's relative execution gap and the conditions for its repair.

Asset mapping & comparison

Structured mapping from thesis to named assets (strengths, weaknesses, peers, risks).

• WDC.US

  Core research subject

  Strengths

  Benefits from tight HDD supply, rising price per EB, improved high-capacity HDD mix, and AI storage demand; UltraSMR products help maintain its near-term market position.

  Weaknesses

  Nearline capacity growth, pace of cost reduction, and gross margin expansion are temporarily lagging STX, and HAMR progress is relatively behind.

  Comparison

  Maintains Overweight rating, but tactical appeal is lower than STX until execution reacceleration is verified.

  Risks

  Demand slowdown, faster-than-expected normalization of pricing, gross margin expansion stalling, delays in 40TB ePMR or HAMR progress, tariff and geopolitical impacts.

• STX

  Key peer and tactically preferred name

  Strengths

  June-quarter nearline capacity grew 42% YoY, unit costs fell 16% YoY, and gross margin expansion and HAMR product mix improvement both led WDC.

  Weaknesses

  The report does not detail standalone weaknesses; it similarly faces risks from the HDD cycle, pricing, and demand changes.

  Comparison

  Under similar industry tailwinds, STX's current execution is superior to WDC's, so it receives tactical preference.

  Risks

  Industry demand below expectations, price declines, cloud customer cycle volatility, and HAMR execution risk.

• HDD value chain

  Core industry theme

  Strengths

  Nearline supply is expected to remain tight through CY28, pricing is accelerating, supply discipline is good, and AI and data center buildout bring incremental storage demand.

  Weaknesses

  The industry is cyclical, and product transitions, customer procurement cadence, and unit cost improvements may diverge significantly among companies.

  Comparison

  The report remains positive on the long-term fundamentals of the HDD industry, but takes a differentiated view on execution by specific companies.

  Risks

  Slowdown in cloud capex, AI storage demand below expectations, supply-demand loosening, and competition from alternative technologies.

Key data

• Price target$676Raised from $650, based on a 4% to 5% increase in earnings forecasts and an unchanged valuation multiple.
• Reference share price$519.17Closing price on August 5, 2026, implying potential upside of approximately 30.2% to the price target.
• WDC nearline capacity growth23% YoYJune-quarter performance was below expectations, with a similar implied growth rate for the September quarter.
• STX nearline capacity growth42% YoYSignificantly ahead of WDC in the June quarter.
• Unit cost declineWDC down 8% YoY, STX down 16% YoYSTX's faster cost reduction is an important reason it narrowed the gross margin gap.
• Quarterly gross margin expansionWDC about 4 percentage points, STX about 6 percentage pointsSTX's margin improvement exceeded WDC's.
• September-quarter gross margin expectation57% to 58%The report believes company guidance is conservative and actual results may be above the implied level.
• Price per EB growthJune quarter up 18% YoY, September quarter about 20%The report expects YoY growth to remain at 20% or above over the next eight quarters.
• Nearline supply situationExpected to be sold out through CY28Long-term agreements have begun to be discussed out to 2031, reflecting tight supply-demand.
• Base-case valuation20.0x CY27 EPS of $33.80Corresponds to the base-case price target of $676.
• Scenario valuesBull $980, base $676, bear $322Mainly depends on AI demand, pricing, product mix, gross margin, and HAMR progress.

Impact & implications

In the short term, WDC needs to demonstrate through subsequent quarters' nearline capacity growth and gross margin performance that the product transition is only a temporary disruption; otherwise, the gap in valuation and share-price performance versus STX may persist. In the medium term, ramp-up of 40TB ePMR, continued increases in price per EB, and a higher mix of high-capacity products are expected to reaccelerate revenue and margin expansion. At the industry level, supply discipline and AI-driven storage demand still leave room for HDD earnings expectations to be revised upward.

Risks

• Nearline HDD demand or capacity growth below expectations.
• Price per EB increases return to normal levels faster than expected.
• Gross margin fails to continue expanding, or the pace of cost reduction continues to lag STX.
• Delays in customer adoption and volume ramp of 40TB ePMR.
• HAMR qualification or mass shipment timing later than expected, increasing competitive pressure.
• AI-driven incremental HDD demand fails to materialize.
• Insufficient capacity utilization, production expenses, and fixed-cost deleveraging pressure margins.
• Geopolitical tensions and rising tariff costs.
• Dilution from convertible securities higher than expected.

What to watch

• Whether nearline HDD capacity growth can reaccelerate over the next 90 days.
• Customer procurement and product mix changes after 40TB ePMR begins ramping in the September quarter.
• Whether September-quarter gross margin can reach the report's expected 57% to 58%.
• Whether price per EB YoY growth can remain around 20% or higher.
• Whether the gap between WDC and STX in unit cost reduction and gross margin narrows.
• Cloud service providers' qualification of the HAMR platform and timing of mass shipments.
• Whether AI-driven incremental HDD demand begins to materialize significantly in CY27.
• Progress on upward earnings revisions, deleveraging, dividend increases, and share repurchases.