Proposed sale of 42,579 ATAI shares (NASDAQ: ATAI) by affiliate

Rhea-AI Filing Summary

Morgan Stanley Smith Barney LLC Executive Financial Services filed a Rule 144 notice to sell 42,579 shares of Common Stock on 04/20/2026, described as resulting from an exercise of stock options and to be settled for cash. The filing lists the transaction as through an issuer-directed exercise.

The excerpt also discloses a prior 10b5-1 sale by Kevin James Craig of 100,000 shares on 03/20/2026 for proceeds of $355,480.00.

Key Figures

Shares to be sold: 42,579 shares Sale date: 04/20/2026 Prior 10b5-1 sale: 100,000 shares +1 more

4 metrics

Shares to be sold 42,579 shares proposed sale dated 04/20/2026 from option exercise

Sale date 04/20/2026 date listed for proposed sale of 42,579 shares

Prior 10b5-1 sale 100,000 shares sale by Kevin James Craig on 03/20/2026

Proceeds from prior sale $355,480.00 proceeds from 100,000-share 10b5-1 sale on 03/20/2026

Key Terms

10b5-1 Sales, Exercise of Stock Options, Rule 144 notice

3 terms

10b5-1 Sales regulatory

"10b5-1 Sales for KEVIN JAMES CRAIG 250 West 34th Street"

Exercise of Stock Options financial

"Securities To Be Sold ... Exercise of Stock Options"

Rule 144 notice regulatory

"144: Securities To Be Sold"

A Rule 144 notice is a public filing that an insider or holder of restricted stock submits when they plan to sell shares that aren’t freely tradable yet; it lists how many shares they intend to sell and under what conditions. For investors, it matters because it signals potential insider selling and an upcoming increase in shares available to the market—similar to someone announcing a big garage sale, which can affect supply and price expectations.

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK
Filer CCC
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.

Relationship to Issuer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	42579	171593.37	364745985	04/20/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	04/20/2026	Exercise of Stock Options	Issuer			42579	04/20/2026	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for KEVIN JAMES CRAIG 250 West 34th Street Q Amstelveen P7 1183	Common	03/20/2026	100000	355480.00

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

ATTENTION:

The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.

Signature

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the ATAI Form 144 notice report?

It reports a proposed sale of 42,579 shares of common stock to be settled in cash. The filing states the shares arise from an exercise of stock options and are dated 04/20/2026.

Who previously sold ATAI shares in the past three months?

Kevin James Craig executed a 10b5-1 sale of 100,000 shares on 03/20/2026, which generated proceeds of $355,480.00, as shown in the excerpt.

How were the 42,579 ATAI shares generated?

The filing states the 42,579 shares are from an exercise of stock options and are to be sold by the issuer for cash on 04/20/2026.

Does the Form 144 show how proceeds are being used?

No specific use of proceeds is stated in the excerpt. The filing only indicates the shares will be settled for cash following the option exercise on 04/20/2026.