RELL · Richardson Electronics, Ltd.

Represents shares surrendered to Issuer in connection with the vesting of a previously reported grant of restricted shares to satisfy the income tax withholding and remittance obligations of the reporting person at a net settlement price equal to closing price on the NASDAQ Global Select Market on July 22, 2026 of $ 18.01 and does not represent a sale of the reporting person.

Represents shares surrendered to Issuer in connection with the vesting of a previously reported grant of restricted shares to satisfy the income tax withholding and remittance obligations of the reporting person at a net settlement price equal to closing price on the NASDAQ Global Select Market on July 22, 2026 of $ 18.01 and does not represent a sale of the reporting person.

Represents shares surrendered to Issuer in connection with the vesting of a previously reported grant of restricted shares to satisfy the income tax withholding and remittance obligations of the reporting person at a net settlement price equal to closing price on the NASDAQ Global Select Market on July 22, 2026 of $ 18.01 and does not represent a sale of the reporting person.

Represents shares surrendered to Issuer in connection with the vesting of a previously reported grant of restricted shares to satisfy the income tax withholding and remittance obligations of the reporting person at a net settlement price equal to closing price on the NASDAQ Global Select Market on July 21, 2026 of $ 17.18 and does not represent a sale of the reporting person.

Represents shares surrendered to Issuer in connection with the vesting of a previously reported grant of restricted shares to satisfy the income tax withholding and remittance obligations of the reporting person at a net settlement price equal to closing price on the NASDAQ Global Select Market on July 21, 2026 of $ 17.18 and does not represent a sale of the reporting person.

Represents shares surrendered to Issuer in connection with the vesting of a previously reported grant of restricted shares to satisfy the income tax withholding and remittance obligations of the reporting person at a net settlement price equal to closing price on the NASDAQ Global Select Market on July 21, 2026 of $ 17.18 and does not represent a sale of the reporting person.

Represents a restricted stock award under the Richardson Electronics, Ltd. Amended and Restated 2011 Long-Term Incentive Plan, which shall vest immediately on the grant date.

Represents a restricted stock award under the Richardson Electronics, Ltd. Amended and Restated 2011 Long-Term Incentive Plan, which shall vest immediately on the grant date.

The stock option was granted on July 20, 2026 pursuant to the Richardson Electronics, Ltd. 2011 Amended and Restated Long-Term Incentive Plan. The option vests over 5 years with 1/5 of the total number of shares subject to the option vesting on each anniversary date of grant, until fully vested.

Represents a restricted stock award under the Richardson Electronics, Ltd. Amended and Restated 2011 Long-Term Incentive Plan, which shall vest immediately on the grant date.

Represents a restricted stock award under the Richardson Electronics, Ltd. Amended and Restated 2011 Long-Term Incentive Plan, which shall vest immediately on the grant date.

The stock option was granted on July 20, 2026 pursuant to the Richardson Electronics, Ltd. 2011 Amended and Restated Long-Term Incentive Plan. The option vests over 5 years with 1/5 of the total number of shares subject to the option vesting on each anniversary date of grant, until fully vested.

Represents a restricted stock award under the Richardson Electronics, Ltd. Amended and Restated 2011 Long-Term Incentive Plan, which shall vest ratably over a three year period, beginning on the first anniversary of the date of issuance.

Represents a restricted stock award under the Richardson Electronics, Ltd. Amended and Restated 2011 Long-Term Incentive Plan, which shall vest ratably over a three year period, beginning on the first anniversary of the date of issuance.

The stock option was granted on July 20, 2026 pursuant to the Richardson Electronics, Ltd. 2011 Amended and Restated Long-Term Incentive Plan. The option vests over 5 years with 1/5 of the total number of shares subject to the option vesting on each anniversary date of grant, until fully vested.

The stock option was granted on July 20, 2026 pursuant to the Richardson Electronics, Ltd. 2011 Amended and Restated Long-Term Incentive Plan. The option vests over 5 years with 1/5 of the total number of shares subject to the option vesting on each anniversary date of grant, until fully vested.

The stock option was granted on July 20, 2026 pursuant to the Richardson Electronics, Ltd. 2011 Amended and Restated Long-Term Incentive Plan. The option vests over 5 years with 1/5 of the total number of shares subject to the option vesting on each anniversary date of grant, until fully vested.

Represents a restricted stock award under the Richardson Electronics, Ltd. Amended and Restated 2011 Long-Term Incentive Plan, which shall vest ratably over a three year period, beginning on the first anniversary of the date of issuance.

Represents a restricted stock award under the Richardson Electronics, Ltd. Amended and Restated 2011 Long-Term Incentive Plan, which shall vest ratably over a three year period, beginning on the first anniversary of the date of issuance.

Represents a restricted stock award under the Richardson Electronics, Ltd. Amended and Restated 2011 Long-Term Incentive Plan, which shall vest immediately on the grant date.

The stock option was granted on July 20, 2026 pursuant to the Richardson Electronics, Ltd. 2011 Amended and Restated Long-Term Incentive Plan. The option vests over 5 years with 1/5 of the total number of shares subject to the option vesting on each anniversary date of grant, until fully vested.

Represents shares surrendered to Issuer in connection with the vesting of a previously reported grant of restricted shares to satisfy the income tax withholding and remittance obligations of the reporting person at a net settlement price equal to closing price on the NASDAQ Global Select Market on July 17, 2026 of $ 17.18 and does not represent a sale of the reporting person.

Represents shares surrendered to Issuer in connection with the vesting of a previously reported grant of restricted shares to satisfy the income tax withholding and remittance obligations of the reporting person at a net settlement price equal to closing price on the NASDAQ Global Select Market on July 17, 2026 of $ 17.18 and does not represent a sale of the reporting person.

The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $16.81 to $16.89 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Options vest 20% per year, beginning 07/19/2022

Options vest 20% per year, beginning 07/21/2021

The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $14.62 to $14.89 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Options vest immediately upon grant 8/20/2018

Options vest immediately upon grant 7/19/2021

The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $ 12.95 to $ 13.08 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Options vest immediately upon grant 7/21/2020

Options vest immediately upon grant 7/22/2019

The reported price in Column 4 is a weighted average sale price. These shares were sold in multiple transactions at prices ranging from $13.00 to $13.27 per share, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the issuer, or the staff of the Securities Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

This represents a bona fide gift. Mrs. Diddell disclaims all beneficial and pecuniary interests.

This represents a bona fide gift. Mrs. Diddell disclaims all beneficial and pecuniary interests.

Options vest 20% per year, beginning 08/20/2019

Options vest 20% per year, beginning 07/22/2020

Options vest 20% per year, beginning 07/21/2021