X0508 4 2025-11-15 0001824502 Archer Aviation Inc. ACHR 0001882348 Muniz Thomas Paul C/O ARCHER AVIATION INC. 190 WEST TASMAN DRIVE SAN JOSE CA 95134 false true false false CHIEF TECHNOLOGY OFFICER 0 Class A Common Stock 2025-11-15 4 M 0 143750 0 A 1471219 D Class A Common Stock 2025-11-15 4 M 0 8946 0 A 1480165 D Class A Common Stock 2025-11-15 4 M 0 7612 0 A 1487777 D Class A Common Stock 2025-11-17 4 S 0 90648 7.4948 D 1397129 D Restricted Stock Units 2025-11-15 4 M 0 143750 0 D Class A Common Stock 143750 862500 D Restricted Stock Units 2025-11-15 4 M 0 8946 0 D Class A Common Stock 8946 80509 D Restricted Stock Units 2025-11-15 4 M 0 7612 0 D Class A Common Stock 7612 60889 D Represents shares of Class A Common Stock of the issuer sold to satisfy the reporting person's tax withholding obligations, which were incurred in connection with the vesting of restricted stock units. 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 $7.245 to $7.87, 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. 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 1st, May 15th, August 15th, and November 15th. These restricted stock units do not expire; they either vest or are cancelled prior to the vesting date. The award vested or vests as to 1/16 of the total award beginning on May 15, 2024, and thereafter quarterly on August 15th, November 15th, March 1st, and May 15th. The award vested or vests as to 1/12 of the total award beginning on March 1, 2025, and thereafter quarterly on May 15th, August 15th, November 15th, and March 1st. /s/ Eric Lentell, Attorney-in-Fact for Thomas Paul Muniz 2025-11-18