Benjamin Lyon - 15 Aug 2026 Form 4 Insider Report for Archer Aviation Inc. (ACHR)

Reporting relationship: President, Aircraft OEM
Issuer ticker: ACHR
Reported as of: 15 Aug 2026
Net transaction value: -$321,846
SEC form: 4
Accepted by SEC: 18 Aug 2026, 20:03:05 UTC
Prior SEC filing: 02 Jul 2026
Source filing: View source filing
Reporting owner signature: /s/ Eric Lentell, Attorney-in-Fact for Benjamin Lyon

Key filing fact

Benjamin Lyon filed Form 4 for Archer Aviation Inc. (ACHR) on 18 Aug 2026.

Key facts

This page summarizes Benjamin Lyon's Form 4 filing for Archer Aviation Inc. (ACHR).
5 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 18 Aug 2026, 20:03.

Change

Previous filing in this sequence was filed on 02 Jul 2026.
Current net transaction value: -$321,846.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001870608 Primary reporting owner

Lyon Benjamin

Relationship: President, Aircraft OEM
Address: C/O ARCHER AVIATION INC., 190 WEST TASMAN DRIVE, SAN JOSE
Signature: /s/ Eric Lentell, Attorney-in-Fact for Benjamin Lyon
Signature date: 18 Aug 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ACHR transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +54,383
Change %
Price: $0.000000^*
Shares after: 54,383
Date: 15 Aug 2026
Ownership: Direct

ACHR transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +41,164
Change %: +76%
Price: $0.000000^*
Shares after: 95,547
Date: 15 Aug 2026
Ownership: Direct

ACHR transaction

Class A Common Stock

Sale

Transaction value: $321,846
Shares: -50,188
Change %: -53%
Price: $6.41
Shares after: 45,359
Date: 17 Aug 2026
Ownership: Direct
Footnotes: F1, F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ACHR transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -54,383
Change %: -14%
Price: $0.000000^*
Shares after: 326,298
Date: 15 Aug 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 54,383
Exercise price
Footnotes: F3, F4, F5

ACHR transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -41,164
Change %: -10%
Price: $0.000000^*
Shares after: 370,476
Date: 15 Aug 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 41,164
Exercise price
Footnotes: F3, F5, F6

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

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

Footnote F2

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $6.32 to $6.485 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.

Footnote F3

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.

Footnote F4

The award vested or vests quarterly in ratable increments, with the first tranche vested on May 15, 2025, and vesting thereafter on August 15, November 15, March 1, and May 15.

Footnote F5

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

Footnote F6

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