Arcellx (ACLX) Amendment shows Vestal Point and Wilder report 0% ownership

Rhea-AI Filing Summary

Arcellx, Inc. (ACLX) Schedule 13G/A filing: Vestal Point Capital, LP and Ryan Wilder filed an Amendment No. 1 reporting ownership of 0% of the Company’s common stock. The statement identifies the Investment Manager and Mr. Wilder and states the reporting persons hold five percent or less of the class.

The cover-page entries show 0.00 shares beneficially owned and 0% of the class; the signatures are dated 05/15/2026.

Insights

Governance Analyst

Routine small‑holder disclosure with no reported beneficial ownership.

The filing amends a prior Schedule 13G and lists Vestal Point Capital, LP and Ryan Wilder as reporting persons while showing 0.00 shares beneficially owned and 0% of the class. This is an informational ownership disclosure.

Because the filing states ownership of five percent or less, it does not by itself indicate a change in control or immediate market impact; subsequent filings would show any material change.

Key Figures

Beneficially owned: 0.00 shares Percent of class: 0% Signature date: 05/15/2026 +2 more

5 metrics

Beneficially owned 0.00 shares Row 9 / cover page

Percent of class 0% Item 4(b)

Signature date 05/15/2026 Filing signatures

CUSIP 03940C100 Cover information / Item 1(d)

Reporting persons' address 632 Broadway, Suite 602, New York, NY 10012 Item 2(b)

Key Terms

Schedule 13G/A, beneficial owner, Percent of class, CUSIP

4 terms

Schedule 13G/A regulatory

"Amendment No. 1 and Item 1 naming issuer and reporting persons"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficial owner regulatory

"The filing states 'should not be construed as an admission that...is the beneficial owner'"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

Percent of class financial

"Item 4(b) lists '0%' as the percent of class"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

CUSIP financial

"Item 1(d) includes '03940C100' for Common Stock"

A CUSIP is a nine-character alphanumeric code that uniquely identifies a U.S. or Canadian financial security—such as a stock, bond, or fund share—like a Social Security number for an investment. It matters to investors because brokers, exchanges and record-keepers use the CUSIP to match trades, track ownership, settle transactions and pull accurate records, reducing errors and ensuring money and securities go to the right place.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Arcellx, Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

03940C100

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 03940C100

1

Names of Reporting Persons

Vestal Point Capital, LP

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0 %

12

Type of Reporting Person (See Instructions)

IA, PN

SCHEDULE 13G

CUSIP Number(s): 03940C100

1

Names of Reporting Persons

Ryan Wilder

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

0 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Arcellx, Inc.
(b)	Address of issuer's principal executive offices: 800 Bridge Parkway, Redwood City, California 94065.
Item 2.
(a)	Name of person filing: This statement is filed by: (i) Vestal Point Capital, LP (the "Investment Manager"), a Delaware limited partnership, and the investment adviser to a certain fund and a managed account (the "Vestal Point Fund and Account"), with respect to the shares of common stock, par value $0.001 per share (the "Common Stock"), of Arcellx, Inc. (the "Company") directly held by the Vestal Point Fund and Account; and (ii) Mr. Ryan Wilder ("Mr. Wilder"), the Chief Investment Officer and Managing Partner of the Investment Manager and the Managing Member of Vestal Point Capital, LLC, the general partner of the Investment Manager, with respect to the shares of Common Stock directly held by the Vestal Point Fund and Account. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." The filing of this statement should not be construed as an admission that any of the foregoing persons or any Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, the beneficial owner of the securities reported herein.
(b)	Address or principal business office or, if none, residence: The address of the business office of each of the Reporting Persons is 632 Broadway, Suite 602, New York, NY 10012.
(c)	Citizenship: The Investment Manager is a Delaware limited partnership. Mr. Wilder is a citizen of the United States.
(d)	Title of class of securities: Common Stock, par value $0.001 per share
(e)	CUSIP No.: 03940C100
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
(b)	Percent of class: 0%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(ii) Shared power to vote or to direct the vote: The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(iii) Sole power to dispose or to direct the disposition of: The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(iv) Shared power to dispose or to direct the disposition of: The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

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.

Vestal Point Capital, LP

Signature:	/s/ Ryan Wilder
Name/Title:	By: Vestal Point Capital, LLC, General Partner, By: Ryan Wilder, Chief Investment Officer and Managing Partner
Date:	05/15/2026

Ryan Wilder

Signature:	/s/ Ryan Wilder
Name/Title:	Ryan Wilder, Individually
Date:	05/15/2026

FAQ

What does Vestal Point Capital's Schedule 13G/A for ACLX state?

It states Vestal Point Capital, LP and Ryan Wilder filed an Amendment No. 1 reporting 0.00 shares and 0% ownership. The filing identifies the reporting persons and their business address in New York.

Does the filing show Vestal Point or Wilder beneficially own ACLX shares?

No. The cover-page and Item 4 indicate 0.00 shares beneficially owned and 0% of the class. The filing reiterates ownership of five percent or less.

When was the Schedule 13G/A signed for ACLX?

The signatures on the Amendment No. 1 are dated 05/15/2026. Both Vestal Point Capital's representative and Ryan Wilder signed the filing on that date.

Who are the reporting persons named in the ACLX filing?

The reporting persons are Vestal Point Capital, LP (the Investment Manager) and Ryan Wilder, Chief Investment Officer and Managing Partner of the Investment Manager.

What address is listed for the reporting persons in the ACLX filing?

The business office address for the reporting persons is listed as 632 Broadway, Suite 602, New York, NY 10012 in the filing's Item 2(b).