LITE · Lumentum Holdings Inc.

Each share is represented by a restricted stock unit (RSU). Each RSU represents the contingent right to receive, following vesting, one share of Common Stock of the Issuer. 100% of the RSUs shall vest on July 15, 2027, subject to the Reporting Person continuing through such date as a Service Provider, as defined under the Issuer's 2025 Equity Incentive Plan. The RSUs were granted to the Reporting Person in lieu of the annual cash retainer, at the election of the Reporting Person, under the Issuer's compensation program for non-employee directors.

Each share is represented by a restricted stock unit (RSU). Each RSU represents the contingent right to receive, following vesting, one share of Common Stock of the Issuer. 100% of the RSUs shall vest on July 15, 2027, subject to the Reporting Person continuing through such date as a Service Provider, as defined under the Issuer's 2025 Equity Incentive Plan. The RSUs were granted to the Reporting Person in lieu of the annual cash retainer, at the election of the Reporting Person, under the Issuer's compensation program for non-employee directors.

Each share is represented by a restricted stock unit (RSU). Each RSU represents the contingent right to receive, following vesting, one share of Common Stock of the Issuer. 100% of the RSUs shall vest on July 15, 2027, subject to the Reporting Person continuing through such date as a Service Provider, as defined under the Issuer's 2025 Equity Incentive Plan. The RSUs were granted to the Reporting Person in lieu of the annual cash retainer, at the election of the Reporting Person, under the Issuer's compensation program for non-employee directors.

Each share is represented by a restricted stock unit (RSU). Each RSU represents the contingent right to receive, following vesting, one share of Common Stock of the Issuer. 100% of the RSUs shall vest on July 15, 2027, subject to the Reporting Person continuing through such date as a Service Provider, as defined under the Issuer's 2025 Equity Incentive Plan. The RSUs were granted to the Reporting Person in lieu of the annual cash retainer, at the election of the Reporting Person, under the Issuer's compensation program for non-employee directors.

Each share is represented by a restricted stock unit (RSU). Each RSU represents the contingent right to receive, following vesting, one share of Common Stock of the Issuer. 100% of the RSUs shall vest on July 15, 2027, subject to the Reporting Person continuing through such date as a Service Provider, as defined under the Issuer's 2025 Equity Incentive Plan. The RSUs were granted to the Reporting Person in lieu of the annual cash retainer, at the election of the Reporting Person, under the Issuer's compensation program for non-employee directors.

Each share is represented by a restricted stock unit (RSU). Each RSU represents the contingent right to receive, following vesting, one share of Common Stock of the Issuer. 100% of the RSUs shall vest on July 15, 2027, subject to the Reporting Person continuing through such date as a Service Provider, as defined under the Issuer's 2025 Equity Incentive Plan. The RSUs were granted to the Reporting Person in lieu of the annual cash retainer, at the election of the Reporting Person, under the Issuer's compensation program for non-employee directors.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2026.

These sales were executed in multiple trades at prices ranging from $1,000.00 to $1,000.09. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide full information regarding the number of shares and prices at which these sales were effected, upon request, to the staff of the Securities and Exchange Commission, the Issuer or a security holder of the Issuer.

Represents shares that have been withheld by the Issuer to satisfy income tax withholding and remittance obligations in connection with the vesting of RSUs.

The number of shares reported as beneficially owned following the reported transaction is as of May 29, 2026, prior to the 4,000 share stock sale on May 29, 2026 reported in the Reporting Person's Form 4 filed June 1, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 27, 2026.

These securities are fully vested restricted stock units (RSUs). Each RSU represents a right to receive one share of Common Stock of the Issuer.

The number of shares reported as beneficially owned following the reported transaction is as of May 29, 2026, prior to the 4,000 share stock sale on May 29, 2026 reported in the Reporting Person's Form 4 filed June 1, 2026.

The Reporting Person contributed the Common Stock to an exchange fund in exchange for the right to receive shares in the exchange fund at a later date which is expected to be at least seven years from the date of transfer. The shares were originally transferred into an escrow account on May 19, 2026 before the official contribution on May 21, 2026. The Reporting Person has no further voting control over the transferred shares, nor does he control the investment decisions of the exchange fund or the shares he ultimately receives in exchange for the transferred shares. For purposes of determining the number of shares of the exchange fund issuable pursuant to such exchange, the Common Stock was valued at $868.07, which was the closing price of the Common Stock on The Nasdaq Global Select Market on the day prior to the exchange.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 5, 2025.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 13, 2025.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on November 28, 2025.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

Represents shares that have been withheld by the Issuer to satisfy income tax withholding and remittance obligations in connection with the vesting of restricted stock units.

Includes 70 shares acquired pursuant to the Issuer's Employee Stock Purchase Plan on May 15, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 12, 2026.

Represents shares that have been withheld by the Issuer to satisfy income tax withholding and remittance obligations in connection with the vesting of restricted stock units.

Represents shares that have been withheld by the Issuer to satisfy income tax withholding and remittance obligations in connection with the vesting of restricted stock units.

Includes 107 shares acquired pursuant to the Issuer's Employee Stock Purchase Plan on May 15, 2026.

Represents shares that have been withheld by the Issuer to satisfy income tax withholding and remittance obligations in connection with the vesting of restricted stock units.

Includes 65 shares acquired pursuant to the Issuer's Employee Stock Purchase Plan on May 15, 2026.

Represents shares that have been withheld by the Issuer to satisfy income tax withholding and remittance obligations in connection with the vesting of restricted stock units.

Includes 57 shares acquired pursuant to the Issuer's Employee Stock Purchase Plan on May 15, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 12, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $964.02 to $965.00.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $1,003.195 to $1,004.00.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $998.43 to $999.13.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $991.50 to $991.65.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $971.25 to $972.00.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $973.98 to $974.47.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $957.76 to $958.00.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $979.00 to $979.89.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $977.50 to $978.49.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $975.38 to $975.73.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $988.82 to $989.48.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $955.00 to $955.035. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide full information regarding the number of shares sold at each separate price, within the ranges set forth in footnotes (2) through (23) to this Form 4, upon request, to the staff of the Securities and Exchange Commission, the Issuer or a security holder of the Issuer.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $966.87 to $967.72.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $996.00 to $996.60..

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $980.00 to $980.69.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $994.50 to $995.465.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $985.00 to $985.545.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $982.12 to $983.00.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on February 6, 2026.

These sales were executed in multiple trades at prices ranging from $999.50 to $1,000.49.