Exhibit 99.1 WD Reports Fiscal Third Quarter 2026 Financial Results Q3FY26 Highlights: • Revenue of $3.34 billion, up 45% year-over-year • GAAP gross margin of 50.2%; non-GAAP gross margin of 50.5% • GAAP diluted EPS of $8.20; non-GAAP diluted EPS of $2.72 • Cash flow from operations of $1.12 billion; free cash flow of $978 million • Q4FY26 revenue expected to be up 36% to 44% year-over-year • Q4FY26 non-GAAP gross margin expected to be in the range of 51% to 52% Western Digital Reports Fiscal Third Quarter ...