Cosmo Feilding-Mellen - 02 Jan 2026 Form 4 Insider Report for AtaiBeckley Inc.

Reporting relationship: Director
Issuer ticker: ATAI on Nasdaq
Reported as of: 02 Jan 2026
Net transaction value: -$154,377
SEC form: 4
Accepted by SEC: 06 Jan 2026, 20:22:09 UTC
Prior SEC filing: 26 Nov 2025
Source filing: View source filing
Reporting owner signature: /s/ Ryan Barrett, as attorney in fact

Key filing fact

Cosmo Feilding-Mellen filed Form 4 for AtaiBeckley Inc. on 06 Jan 2026.

Key facts

This page summarizes Cosmo Feilding-Mellen's Form 4 filing for AtaiBeckley Inc..
1 reported transaction and 0 derivative rows are listed below.
Accepted by SEC: 06 Jan 2026, 20:22.

Change

Previous filing in this sequence was filed on 26 Nov 2025.
Current net transaction value: -$154,377.

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 0002094202 Primary reporting owner

Feilding-Mellen Cosmo

Relationship: Director
Address: C/O ATAI LIFE SCIENCES US, INC., C/O INDUSTRIOUS NYC, 250 WEST 34TH ST, NEW YORK
Signature: /s/ Ryan Barrett, as attorney in fact
Signature date: 06 Jan 2026

Reported non-derivative transactions

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

ATAI transaction

Common Stock

Sale

Transaction value: $154,377
Shares: -39,594
Change %: -0.51%
Price: $3.90
Shares after: 7,663,396
Date: 02 Jan 2026
Ownership: Direct
Footnotes: F1, F2

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Represents shares sold to satisfy the Reporting Person's tax liability on vesting of restricted stock units.

Footnote F2

The price reported is a weighted average price. The securities were sold in multiple transactions at per share prices ranging from $3.79 to $3.99. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.