ACHR · Archer Aviation Inc.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued service to the Issuer on the applicable vesting date.

All of the restricted stock units vest on the earlier of the: (i) one year anniversary of the grant date or (ii) date of the Issuer's 2027 annual stockholders' meeting. On the vesting date, pursuant to the reporting person's election, the restricted stock units will automatically convert into an equal number of deferred stock units, which will be settled for an equal number of shares of the Issuer's Class A Common Stock on the tenth anniversary of the grant date. Notwithstanding the aforementioned deferral period, from and after the vesting date, the deferred stock units may automatically settle earlier upon the reporting person's death, disability, or separation from service with the Issuer, or upon the occurrence of an "unforeseeable emergency," as that term is defined under the deferred compensation program.

The deferred restricted stock units do not expire; they either will vest on the vesting date and settle for shares at the end of the deferral period or they will be cancelled prior to the vesting date in the event the reporting person ceases to provide services to the Issuer.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued service to the Issuer on the applicable vesting date.

The entire award will vest on the earlier of the: (i) one year anniversary of the grant date or (ii) date of the Issuer's 2027 annual stockholders' meeting.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued service to the Issuer on the applicable vesting date.

The entire award vested or vests on the earlier of the: (i) one year anniversary of the grant date or (ii) date of the Issuer's 2026 annual stockholders' meeting.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued service to the Issuer on the applicable vesting date.

The entire award vested or vests on the earlier of the: (i) one year anniversary of the grant date or (ii) date of the Issuer's 2026 annual stockholders' meeting.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued service to the Issuer on the applicable vesting date.

The entire award will vest on the earlier of the: (i) one year anniversary of the grant date or (ii) date of the Issuer's 2027 annual stockholders' meeting.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued service to the Issuer on the applicable vesting date.

The entire award will vest on the earlier of the: (i) one year anniversary of the grant date or (ii) date of the Issuer's 2027 annual stockholders' meeting.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued service to the Issuer on the applicable vesting date.

The entire award vested or vests on the earlier of the: (i) one year anniversary of the grant date or (ii) date of the Issuer's 2026 annual stockholders' meeting.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued service to the Issuer on the applicable vesting date.

The entire award vested or vests on the earlier of the: (i) one year anniversary of the grant date or (ii) date of the Issuer's 2026 annual stockholders' meeting.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued service to the Issuer on the applicable vesting date.

The entire award vested or vests on the earlier of the: (i) one year anniversary of the grant date or (ii) date of the Issuer's 2026 annual stockholders' meeting.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Represents shares of the issuer's Class A common stock sold to satisfy the reporting person's tax withholding obligations, which were incurred in connection with the vesting of restricted stock units, which vesting was separately reported on a Form 4 filed with the U.S. Securities and Exchange Commission on May 19, 2026. In accordance with company policy, shares are automatically sold to cover such obligations.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $4.98 to $5.035 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Represents shares of Class A Common Stock sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.87 to $6.13 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Represents shares of Class A Common Stock sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.87 to $6.13 per share, inclusive.

Represents shares of Class A Common Stock sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.87 to $6.13 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.

Represents shares of Class A Common Stock sold to satisfy tax withholding obligations incurred in connection with the vesting of restricted stock units.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $5.87 to $6.13 per share, inclusive.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the Issuer.

The award vested or vests quarterly as to 1/16 of the total award, with the first tranche vested on May 15, 2024, and thereafter on August 15, November 15, March 1, and May 15.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the issuer.

The award vested or vests quarterly as to 1/12 of the total award, with the first tranche vested on March 1, 2025, and thereafter on May 15, August 15, November 15, and March 1.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the issuer.

The award vested or vests quarterly as to 1/16 of the total award, with the first tranche vested on May 15, 2024, and thereafter on August 15, November 15, March 1, and May 15.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the Issuer.

The award shall vest as to 1/12 of the total award beginning on May 15, 2026, and thereafter quarterly on August 15th, November 15th, March 1st, May 15th.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the Issuer.

The award vested or vests quarterly as to 1/12 of the total award, with the first tranche vested on March 1, 2025, and thereafter on May 15, August 15, November 15, and March 1.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the Issuer.

The award vested or vests quarterly as to 1/16 of the total award, with the first tranche vested on May 15, 2023, and thereafter on August 15, November 15, March 1, and May 15.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Represents shares of Class A Common Stock sold to satisfy tax withholding obligations incurred in connection with the vesting of performance restricted stock units, which was separately reported on a Form 4 filed with the U.S. Securities and Exchange Commission on April 22, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.005 to $6.135 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote and in footnote 4 of this Form 4.

Each restricted stock unit represents a contingent right to receive one share of the issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the issuer.

The award vested or vests quarterly as to 1/12 of the total award, with the first tranche vested on March 1, 2026, and thereafter on May 15, August 15, November 15, and March 1.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the Issuer.

The award vested or vests quarterly as to 1/12 of the total award, with the first tranche vested on March 1, 2026, and thereafter on May 15, August 15, November 15, and March 1.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the issuer.

The award vested or vests quarterly as to 1/12 of the total award, with the first tranche vested on March 1, 2026, and thereafter on May 15, August 15, November 15, and March 1

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the Issuer.

The award shall vest as to 1/12 of the total award beginning on May 15, 2026, and thereafter quarterly on August 15th, November 15th, March 1st, May 15th.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued service to the Issuer as of the applicable vesting date.

The award shall vest as to 1/12 of the total award quarterly on each of August 15th, November 15th, March 1st, and May 15th. Once time-vested, the restricted stock units will be settled for shares of the Issuer's Class A Common Stock during calendar year 2031 on a date to be determined by the Issuer.

(Continued from footnote (2)) Notwithstanding the aforementioned deferral period, once vested, deferred stock units will automatically settle earlier upon the earliest to occur of: (i) the reporting person's death, disability, or separation from service with the Issuer, (ii) a Change in Control (as defined under the Issuer's 2021 Amended and Restated Equity Incentive Plan) or (iii) the occurrence of an "unforeseeable emergency" (as defined under Section 409A of the Internal Revenue Code). The events described in subclauses (i), (ii), and (iii) of the preceding sentence are referred to herein as the "Extraordinary Settlement Events." If an Extraordinary Settlement Event occurs before the applicable vesting date, then settlement will occur instead on the applicable vesting date.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Represents shares of Class A Common Stock sold to satisfy tax withholding obligations incurred in connection with the vesting of performance restricted stock units, which was separately reported on a Form 4 filed with the U.S. Securities and Exchange Commission on April 22, 2026.

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.005 to $6.135 per share, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the U.S. Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote and in footnote 4 of this Form 4.

Each restricted stock unit represents a contingent right to receive one share of the issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the issuer.

The award vested or vests as to: (i) 1/4 of the total award on May 15, 2024; and (ii) 1/16 of the total award quarterly thereafter on March 1, May 15, August 15, and November 15.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the Issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the Issuer.

The award vested or vests as to: (i) 1/4 of the total award on August 15, 2023; and (ii) 1/16 of the total award quarterly thereafter on November 15, March 1, May 15, and August 15.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the issuer.

The award vested or vests quarterly as to 1/12 of the total award, with the first tranche vesting on May 15, 2026, and vesting thereafter on August 15, November 15, March 1, and May 15.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.

Each restricted stock unit represents a contingent right to receive one share of the issuer's Class A Common Stock, subject to the reporting person's continued status as a service provider to the issuer.

The award vested or vests quarterly as to 1/12 of the total award, with the first tranche vested on March 1, 2025, and thereafter on May 15, August 15, November 15, and March 1.

These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date.