WESTERN DIGITAL CORP

This summary highlights information contained elsewhere in this Proxy Statement. This summary does not contain all of the information that you should consider. We encourage you to read this entire Proxy Statement for more information about these topics prior to voting.

Our Director Nominees

Board Nominee Highlights

Corporate Governance Highlights

Our Board of Directors is committed to maintaining the highest standards of corporate governance. Our strong corporate governance practices are intended to help promote the long-term interests of our stockholders.

Corporate Governance Best Practices

We regularly evaluate our corporate governance practices against prevailing best practices, as well as emerging and evolving topics identified through stockholder outreach, trends and developments in corporate governance.

Year-Round Stockholder Engagement

We have a regular and long-standing practice of maintaining dialogue with our stockholders through our Board-led stockholder engagement program. We value our stockholders’ feedback and have relied on our ongoing engagement program to solicit, identify and understand stockholder perspectives and feedback on our strategy, Board refreshment and composition, executive compensation, sustainability and other areas of investor focus. After the Separation, we reached out to stockholders representing approximately 68% of shares outstanding and conducted calls with stockholders representing approximately 30% of shares outstanding, and reflecting various investment styles and geographies. Tunç Doluca, Chair of the Compensation and Talent Committee, led select engagements. Stockholder feedback is shared regularly with our Board and serves as a critical input in our Board's deliberations and decision-making process. Please see the section entitled “Corporate Governance Matters—Stockholder Engagement” on page 24 for a description of the topics discussed and stockholder feedback during our summer 2025 stockholder engagement.

Corporate Responsibility and Sustainability

We believe responsible and sustainable business practices support the long-term success of our company. For us, sustainability is about innovating with technology to positively impact our future. We believe that sustainability can create opportunities for everyone in our value chain and serves as a competitive differentiator. Our focus is on minimizing our environmental footprint, influencing our ecosystem, empowering and connecting our stakeholders and embedding sustainability in our decision-making processes. According to our customers, they view our sustainability program as an important part of their own efforts to achieve environmental objectives, making it a meaningful extension of the value we provide. Our commitment to sustainability is reflected in our long-term strategy, as well as our day-to-day activities to support that strategy. These activities include our adoption of sustainability-focused policies and procedures, fostering an inclusive workplace, our constant drive toward more efficient use of materials and energy, our careful and active management of our supply chain, our community-focused volunteerism programs and philanthropic initiatives and our impactful, globally-integrated ethics and compliance program. The Governance Committee oversees our corporate responsibility and sustainability policies and programs pursuant to its charter.

Continuing our focus on environmental sustainability, we re-baselined our goals following the Separation. In June 2025, we reaffirmed our commitment to running our global operations on 100% carbon-free energy by 2030 and to achieve net zero emissions in our operations (Scopes 1 and 2) by 2032, reducing downstream use phase emissions per petabyte by 50% (as compared to a 2020 baseline), as well as diverting more than 95% of our operational waste from landfills and reducing water withdrawals by 20% (as compared to a 2022 baseline), both by 2030. Aligning with industry trends and how our cloud customers are approaching energy demand and supply, we added carbon-free energy to our energy mix, opening more options for decarbonization. In addition, we are committing to a 20% reduction of upstream direct materials Scope 3 emissions (as compared to a 2024 baseline) by 2030.

In close collaboration with our customers and suppliers, we are expanding our circularity programs. Our efforts are focused on recovery, recycling and reduction of virgin materials. For example, in April 2025 we announced our at-scale HDD Rare Earth material recapture program in collaboration with a key customer and recyclers, achieving rare earth recovery in the United States. We furthered our commitment to circularity by announcing goals to increase recycled content in our enterprise HDD products to 43% and packaging to 72%, both by 2030.

Our 2024 Sustainability Report is located on our Corporate Responsibility page at www.westerndigital.com. Information included in our 2024 Sustainability Report and on our website, other than this Proxy Statement, is not incorporated by reference into, and is not a part of, this Proxy Statement. For more information, please refer to the section entitled “Corporate Governance Matters—Corporate Responsibility and Sustainability” on page 21.