SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 4)

AtaiBeckley Inc.

(Name of Issuer)

Common stock, par value $0.01 per share

(Title of Class of Securities)

04650F101

(CUSIP Number)

Evan S. Simpson
1 New Fetter Lane,
London, X0, EC4A 1AN
44 20 7959-8426

(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

07/15/2026

(Date of Event Which Requires Filing of This Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§ 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. Checkbox not checked

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (“Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

SCHEDULE 13D

CUSIP Number(s):

04650F101

Name of reporting person

Apeiron Investment Group Ltd.

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

MALTA

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 55,770,948.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 55,770,948.00

Aggregate amount beneficially owned by each reporting person

55,770,948.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

15.1 %

Type of Reporting Person (See Instructions)

SCHEDULE 13D

CUSIP Number(s):

04650F101

Name of reporting person

Apeiron Presight Capital Fund II, L.P.

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,799,302.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,799,302.00

Aggregate amount beneficially owned by each reporting person

1,799,302.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

0.5 %

Type of Reporting Person (See Instructions)

SCHEDULE 13D

CUSIP Number(s):

04650F101

Name of reporting person

Presight Capital Management I, L.L.C.

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,799,302.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,799,302.00

Aggregate amount beneficially owned by each reporting person

1,799,302.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

0.5 %

Type of Reporting Person (See Instructions)

SCHEDULE 13D

CUSIP Number(s):

04650F101

Name of reporting person

Fabian Hansen

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 0.00
8	Shared Voting Power 1,799,302.00
9	Sole Dispositive Power 0.00
10	Shared Dispositive Power 1,799,302.00

Aggregate amount beneficially owned by each reporting person

1,799,302.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

0.5 %

Type of Reporting Person (See Instructions)

SCHEDULE 13D

CUSIP Number(s):

04650F101

Name of reporting person

Christian Angermayer

Check the appropriate box if a member of a Group (See Instructions)

(a)

(b)

SEC use only

Source of funds (See Instructions)

Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)

Checkbox not checked

Citizenship or place of organization

Number of Shares Beneficially Owned by Each Reporting Person With:

7	Sole Voting Power 1,600,418.00
8	Shared Voting Power 56,812,134.00
9	Sole Dispositive Power 1,600,418.00
10	Shared Dispositive Power 56,812,134.00

Aggregate amount beneficially owned by each reporting person

56,812,134.00

Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in Row (11)

15.4 %

Type of Reporting Person (See Instructions)

SCHEDULE 13D

Item 1.

Security and Issuer

(a)

Title of Class of Securities:

Common stock, par value $0.01 per share

(b)

Name of Issuer:

AtaiBeckley Inc.

(c)

Address of Issuer's Principal Executive Offices:

250 West 34th Street, New York, NEW YORK , 10119.

Item 2.

Identity and Background

(a)

This Amendment No. 4 (the "Amendment No. 4") to Schedule 13D amends and supplements the Schedule 13D originally filed with the Securities and Exchange Commission on February 24, 2025 (the "Schedule 13D"), Amendment No. 1 thereto filed on June 4, 2025, Amendment No. 2 thereto filed on August 18, 2025 and Amendment No. 3 thereto filed on October 20, 2025. This Amendment No. 4 is filed by: (i) Apeiron Investment Group Ltd. ("Apeiron"); (ii) Apeiron Presight Capital Fund II, L.P. ("Presight II"); (iii) Presight Capital Management I, L.L.C. ("Presight Management"); (iv) Fabian Hansen; and (v) Christian Angermayer.

(b)

The principal business address of Apeiron and Mr. Angermayer is 66 & 67 Amery Street, SLM1707, Sliema, Malta. The principal business address of each of the remaining Reporting Persons is 440 N Barranca Ave #3391, Covina, CA 91723 USA.

(c)

The principal business of Apeiron and Presight II are making investments. The principal business of Presight Management is acting as the general partner of Presight II. Apeiron's sole director is Sanad Abushala and his principal business address is Centris Business Gateway, Level 0/C, Triq Is-Salib tal-Imriehel, Zone 3, Central Business District, Mirehel, Birkirkara, Malta CBD 3020. His present principal occupation is Head of Treasury at Apeiron.

(d)

(e)

(f)

Presight II and Presight Management are organized under the laws of the state of Delaware. Apeiron is organized under the laws of the Malta. Each of Messrs. Hansen and Angermayer is a German citizen. Mr. Abushala is a Croatian citizen.

Item 4.

Purpose of Transaction

Item 4 of the Schedule 13D is hereby amended and restated in its entirety as follows: On July 15, 2026, the Issuer entered into an Agreement and Plan of Merger (the "Merger Agreement") with Eli Lilly and Company, an Indiana corporation ("Parent"), and Albali Acquisition Corporation, a Delaware corporation and indirect wholly owned subsidiary of Parent ("Merger Sub"), pursuant to which, subject to satisfaction or waiver of the conditions therein, Merger Sub will merge with and into the Issuer (the "Merger"), with the Issuer surviving as a wholly owned subsidiary of Parent. On July 15, 2026, in connection with the execution of the Merger Agreement, Apeiron and Christian Angermeyer entered into separate Voting and Support Agreements (the "Support Agreements") with Parent. The Support Agreements provide that, among other things, each of Apeiron and Christian Angermeyer has agreed (i) to vote all of the shares of common stock held by such stockholder in favor of the adoption of the Merger Agreement, subject to certain exceptions (including the valid termination of the Merger Agreement), (ii) not to transfer such shares of common stock, and (iii) to certain other restrictions on its ability to take actions with respect to the Company and its shares of common stock. The foregoing descriptions of the Support Agreements does not purport to be complete and is qualified in its entirety by the full text of the form of Support Agreement, a copy of which is filed as Exhibit 99.1 to this Amendment No. 4 and is incorporated into this Item 4 by reference. A copy of the form of Support Agreement and the above description of the Support Agreements have been included to provide investors with information regarding the terms of the Support Agreements. They are not intended to provide any other factual information about the parties to the Support Agreements or their respective subsidiaries or affiliates. The representations, warranties and covenants contained in the Support Agreements were made only for the purposes of the Support Agreements and as of specific dates, are solely for the benefit of the parties to the Support Agreements, may be subject to limitations agreed upon by the contracting parties, including being qualified by confidential disclosures made for the purposes of allocating contractual risk between the parties to the Support Agreements instead of establishing these matters as facts, and may be subject to standards of materiality applicable to the contracting parties that differ from those applicable to investors. Investors are not third-party beneficiaries under the Support Agreements and should not rely on the representations, warranties and covenants or any descriptions thereof as characterizations of the actual state of facts or condition of the parties thereto or any of their respective subsidiaries or affiliates. Moreover, information concerning the subject matter of representations and warranties may change after the date of the Support Agreements, which subsequent information may or may not be fully reflected in the Reporting Persons', the Issuer's or Parent's public disclosures.

Item 5.

Interest in Securities of the Issuer

(a)

As of June 22, 2026, the Reporting Persons collectively beneficially own 56,812,134 shares of common stock, representing approximately 15.4% of the voting rights attached to the shares of common stock. The ownership percentages set forth in this Amendment No. 4 have been calculated on the basis of 368,166,674 shares of common stock outstanding as of May 8, 2026, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission ("SEC") on May 12, 2026.

(b)

The following table sets forth, as of the date of this Amendment No. 4, the aggregate number of shares of common stock and percentage of shares of common stock beneficially owned by each of the Reporting Persons, as well as the number of shares of common stock as to which each Reporting Person has the sole power to vote or to direct the vote, shared power to vote or to direct the vote, sole power to dispose or to direct the disposition of, or shared power to dispose or to direct the disposition of. Reporting Amount beneficially Percent of Sole power to vote or Shared power to vote or Sole power to dispose or Shared power to dispose or Person owned class to direct the vote to direct the vote to direct the disposition to direct the disposition Apeiron Investment 55,770,948 15.1% 0 55,770,948 0 55,770,948 Group, Ltd. Apeiron Presight 1,799,302 0.5% 0 1,799,302 0 1,799,302 Capital Fund II, L.P. Presight Capital 1,799,302 0.5% 0 1,799,302 0 1,799,302 Management I, L.L.C. Fabian Hansen 1,799,302 0.5% 0 1,799,302 0 1,799,302 Christian Angermayer 56,812,134 15.4% 1,600,418 56,812,134 1,600,418 56,812,134 Presight II is the record holder of 1,799,302 shares of common stock. Apeiron is the record holder of 53,917,646 shares of common stock. Christian Angermayer may be deemed to beneficially own 1,041,186 shares of common stock underlying vested options to purchase shares of common stock. Presight Management is the general partner of Presight II. Apeiron and Fabian Hansen are the managing members of Presight Management. Christian Angermayer is the controlling shareholder of Apeiron. As a result, each of Presight Management, Apeiron, Mr. Hansen and Mr. Angermayer may be deemed to share beneficial ownership of the securities held by Presight II, and Mr. Angermayer may be deemed to share beneficial ownership of the securities held by Apeiron.

(c)

Except as described in this Item 5, none of the Reporting Persons has beneficial ownership of any shares of common stock or, except as described in this Schedule 13D, has effected any transaction in the shares of common stock during the past 60 days.

(d)

No other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the shares of common stock owned, directly or indirectly, by the Reporting Persons.

(e)

N/A

Item 6.

Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer

The information provided and/or incorporated by reference in Item 4 is hereby incorporated by reference into this Item 6.

Item 7.

Material to be Filed as Exhibits.

Exhibit No. Description Exhibit 99.1 Form of Voting and Support Agreement, dated as of July 15, 2026 (incorporated by reference to Exhibit 10.1 of the Issuer's Current Report on Form 8-K, filed on July 16, 2026).

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Apeiron Investment Group Ltd.

Signature:	/s/ Sanad Abushala
Name/Title:	Sanad Abushala, Director
Date:	07/17/2026

Apeiron Presight Capital Fund II, L.P.

Signature:	/s/ Fabian Hansen
Name/Title:	Fabian Hansen, Managing Member
Date:	07/17/2026

Presight Capital Management I, L.L.C.

Signature:	/s/ Fabian Hansen
Name/Title:	Fabian Hansen, Managing Member
Date:	07/17/2026

Fabian Hansen

Signature:	/s/ Fabian Hansen
Name/Title:	Fabian Hansen
Date:	07/17/2026

Christian Angermayer

Signature:	/s/ Christian Angermeyer
Name/Title:	Christian Angermayer
Date:	07/17/2026