AXTI · Axt Inc

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $113.38 to $116.69,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The reporting person is subject to a lock-up agreement that expires on June 20, 2026 that was entered into with the representative of the underwriters (the "Representative") in connection with an underwritten public offering of the Issuer's common stock (the "Offering"). This bona fide gift is a permissible exemption under the terms of the lock-up agreement.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $88.70 to $103.33,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $87.38 to $89.50,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $83.00 to $90.00,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $91.12 to $95.88,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

Represents an annual equity grant of common stock calculated based upon $105.99, which was the closing price of the Issuer's common stock on June 4, 2026 (the "Grant Date"), and vests on May 14, 2027.

Represents an annual equity grant of common stock calculated based upon $105.99, which was the closing price of the Issuer's common stock on June 4, 2026 (the "Grant Date"), and vests on May 14, 2027.

Represents an annual equity grant of common stock calculated based upon $105.99, which was the closing price of the Issuer's common stock on June 4, 2026 (the "Grant Date"), and vests on May 14, 2027.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $105.32 to $112.26,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $106.68 to $114.36,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

Represents the exercise of options which were originally granted on 10/28/2016 and became first exercisable on 10/28/2017. All of the shares subject to this option are fully vested.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $110.685 to $111.38,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

Represents the exercise of options which were originally granted on 10/28/2016 and became first exercisable on 10/28/2017. All of the shares subject to this option are fully vested.

Of the total shares sold, 11,806 shares were sold pursuant to the cashless exercise/same-say sale of the options reported in footnote 3.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $107.70 to $121.48,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

Represents the exercise of options which were originally granted on 10/28/2016 and became first exercisable on 10/28/2017. All of the shares subject to this option are fully vested.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions pursuant to the cashless exercise/same-say sale of the options reported in footnote 1 at prices ranging from $110.00 to $115.64,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

Represents the exercise of options which were originally granted on 10/28/2016 and became first exercisable on 10/28/2017. All of the shares subject to this option are fully vested.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $109.2609 to $115.38,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

Represents a bona-fide gift as a charitable contribution to a donor advised fund. The reporting person is subject to a lock-up agreement that expires on June 20, 2026 that was entered into with the representative of the underwriters (the "Representative") in connection with an underwritten public offering of the Issuer's common stock (the "Offering"). This charitable contribution is a permissible exemption under the terms of the lock-up agreement.

Represents a bona-fide gift as a charitable contribution to a charitable foundation. The reporting person is subject to a lock-up agreement that expires on June 20, 2026 that was entered into the Representative in connection with the Offering. This charitable contribution is a permissible exemption under the terms of the lock-up agreement.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $48.39 to $51.38,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $50.87 to $51.45,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $50.19 to $51.38,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.72 to $49.825,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $50.02 to $50.72,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.83 to $47.68,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.60 to $46.63,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $44.52 to $46.63,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $35.00 to $38.81,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $37.29 to $38.30,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.10 to $39.85,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.00 to $38.69, inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $38.53 to $39.13,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.09 to $41.0951, inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $40.00 to $45.82,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $39.38 to $46.98,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.39 to $45.83,inclusive. Upon request by the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate transaction.