SNDK · Sandisk Corp

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 4, 2026.

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 4, 2026.

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 4, 2026.

Reflects the gift of common stock to a charitable donor advised fund.

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $1754.8000 to a high of $1755.6800. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $1758.0200 to a high of $1758.8850. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $1757.0000 to a high of $1757.0850. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

On May 12, 2026, the Reporting Person's Spouse's Trust gifted 9,666 shares to irrevocable trusts for the benefit of the Reporting Person's children for estate planning purposes. The Reporting Person disclaims beneficial ownership of these shares, which are now held by a third-party trustee, and they are no longer indirectly owned by the Reporting Person.

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

This transfer was for bona fide estate planning purposes. The transferred shares remain subject to certain restrictions on transfer pursuant to a lock-up agreement, expiring March 19, 2026.

Represents shares of common stock sold to satisfy tax obligations resulting from the vesting of equity awards in the tax year ended December 31, 2025 and capital gains incurred with respect to such sales in the tax year ending December 31, 2026. The Reporting Person is subject to a lock-up agreement, expiring March 19, 2026, which prohibits transfers, sales or other dispositions of shares of common stock during the applicable restricted period, subject to certain exceptions, including an exception for the sales reported on this Form 4.

Represents the weighted average sale price per share. The shares were sold in multiple transactions at prices ranging from $627.39 to $627.5351. The Reporting Person undertakes to provide the Issuer, any security holder, or the SEC staff, upon request, full information regarding the number of shares sold at each individual price.

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Represents the grant of restricted stock units to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).