Helix Acquisition (HLXC) Schedule 13G: 1.25M Shares

Helix Acquisition Corp. III reports a Schedule 13G disclosure showing beneficial ownership of 1,250,000 shares of Class A ordinary shares by Nantahala Capital Management, LLC as of March 31, 2026.

Rhea-AI Filing Summary

Helix Acquisition Corp. III reports a Schedule 13G disclosure showing beneficial ownership of 1,250,000 shares of Class A ordinary shares by Nantahala Capital Management, LLC as of March 31, 2026. The filing states that Nantahala and its managers, Wilmot B. Harkey and Daniel Mack, each may be deemed to beneficially own 1,250,000 shares, representing 8.33% of the class. The disclosed holdings reflect shared voting and dispositive power of 1,250,000 shares for each Reporting Person; sole voting and dispositive power are reported as 0.

Insights

Institutional Ownership Analyst

Large passive stake reported by an investment adviser and its managers.

The Schedule 13G lists 1,250,000 shares beneficially owned by Nantahala and credits shared voting and dispositive power to Nantahala and its named managers as of March 31, 2026. The filing attributes an ownership percentage of 8.33% to each Reporting Person.

The disclosure is typical for an investment adviser reporting under passive or qualifying owner rules; cash‑flow treatment or plans for disposition are not stated in the excerpt. Subsequent filings would show any changes in status or voting/disposition intentions.

Securities Compliance Specialist

Schedule 13G compliance signals passive reporting by an adviser and control persons.

The report identifies Nantahala as a Massachusetts adviser and lists Messrs. Harkey and Mack as control persons who may be deemed beneficial owners of the same 1,250,000 shares. The form records shared powers and a 8.33% stake as of March 31, 2026.

Filing signatures are dated May 15, 2026. The filing follows Rule 13d reporting conventions; any future change in intent, voting power, or holdings must be reported via amendment.

Key Figures

Reporting date: March 31, 2026 Shares beneficially owned: 1,250,000 shares Percent of class: 8.33% +3 more

6 metrics

Reporting date March 31, 2026 Ownership figures effective date

Shares beneficially owned 1,250,000 shares Held by funds and SMAs under Nantahala control

Percent of class 8.33% Percent of Class A ordinary shares outstanding as of reported date

CUSIP G4444S107 Class A ordinary shares identifier

Sole voting power 0 Shares Reported for Nantahala and each manager

Shared voting power 1,250,000 Shares Reported for Nantahala and each manager

Key Terms

Schedule 13G, beneficially owned, shared dispositive power

3 terms

Schedule 13G regulatory

"As of March 31, 2026, Nantahala may be deemed to be the beneficial owner"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

beneficially owned regulatory

"Nantahala may be deemed to be the beneficial owner of 1,250,000 Shares"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared dispositive power financial

"Shared power to dispose or to direct the disposition of: 1,250,000 Shares"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does Nantahala report in HLXC?

Nantahala reports beneficial ownership of 1,250,000 shares of HLXC Class A ordinary shares as of March 31, 2026. The filing lists this holding as 8.33% of the class and attributes shared voting and dispositive power to the Reporting Persons.

Do the named managers hold sole voting power in HLXC?

No. The Schedule 13G states each Reporting Person has 0 shares of sole voting power and 1,250,000 shares of shared voting power. The filing thus attributes joint control rather than sole control over the disclosed shares.

What date are the ownership figures reported as of?

The beneficial ownership amounts are reported as of March 31, 2026. Signature dates on the filing are May 15, 2026, which is the date the Reporting Persons signed the Schedule 13G disclosure.

Who signed the Schedule 13G for these HLXC holdings?

The filing is signed by Taki Vasilakis as Chief Compliance Officer and by the Reporting Persons Wilmot B. Harkey and Daniel Mack, each dated May 15, 2026, certifying the Schedule 13G information under applicable rules.

AI-generated analysis. How Rhea-AI works. Not financial advice.

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 05/15/2026 - 04:35 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

HELIX ACQUISITION CORP. III

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G4444S107

(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): G4444S107

1

Names of Reporting Persons

Nantahala Capital Management, LLC

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

MASSACHUSETTS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,250,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,250,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,250,000.00

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)

8.33 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP Number(s): G4444S107

1

Names of Reporting Persons

Wilmot B. Harkey

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 1,250,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,250,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,250,000.00

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)

8.33 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

CUSIP Number(s): G4444S107

1

Names of Reporting Persons

Daniel Mack

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 1,250,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,250,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,250,000.00

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)

8.33 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: HELIX ACQUISITION CORP. III
(b)	Address of issuer's principal executive offices: C/O CORMORANT ASSET MANAGEMENT LP 200 CLARENDON STREET, 52ND FLOOR BOSTON, MASSACHUSETTS, 02116
Item 2.
(a)	Name of person filing: (1) Nantahala Capital Management, LLC ("Nantahala") (2) Wilmot B. Harkey (3) Daniel Mack (together the "Reporting Persons")
(b)	Address or principal business office or, if none, residence: 130 Main St. 2nd Floor, New Canaan, Connecticut 06840
(c)	Citizenship: (1) Nantahala is a Massachusetts limited liability company. (2) Each of Messrs. Harkey and Mack is a citizen of the United States of America.
(d)	Title of class of securities: Class A ordinary shares, par value $0.0001 per share
(e)	CUSIP Number(s): G4444S107
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: As of March 31, 2026, Nantahala may be deemed to be the beneficial owner of 1,250,000 Shares held by funds and separately managed accounts under its control, and as the managing members of Nantahala, each of Messrs. Harkey and Mack may be deemed to be a beneficial owner of those Shares.
(b)	Percent of class: As of March 31, 2026, each of the Reporting Persons may be deemed to be the beneficial owner of the following percentage of the total number of Shares outstanding: (1) Nantahala Capital Management, LLC ("Nantahala") : 8.33% (2) Wilmot B. Harkey: 8.33% (3) Daniel Mack: 8.33%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: (1) Nantahala Capital Management, LLC ("Nantahala") : 0 Shares. (2) Wilmot B. Harkey: 0 Shares. (3) Daniel Mack: 0 Shares.
	(ii) Shared power to vote or to direct the vote: (1) Nantahala Capital Management, LLC ("Nantahala") : 1,250,000 Shares. (2) Wilmot B. Harkey: 1,250,000 Shares. (3) Daniel Mack: 1,250,000 Shares.
	(iii) Sole power to dispose or to direct the disposition of: (1) Nantahala Capital Management, LLC ("Nantahala") : 0 Shares. (2) Wilmot B. Harkey: 0 Shares. (3) Daniel Mack: 0 Shares.
	(iv) Shared power to dispose or to direct the disposition of: (1) Nantahala Capital Management, LLC ("Nantahala") : 1,250,000 Shares. (2) Wilmot B. Harkey: 1,250,000 Shares. (3) Daniel Mack: 1,250,000 Shares.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
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.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. Each of Messrs. Harkey and Mack is filing this Schedule 13G as a control person in respect of shares beneficially owned by Nantahala, an investment adviser as described in ss. 240.13d-1(b)(1)(ii)(E). See Item 4(a).
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.

Nantahala Capital Management, LLC

Signature:	/s/ Taki Vasilakis
Name/Title:	Taki Vasilakis / Chief Compliance Officer
Date:	05/15/2026

Wilmot B. Harkey

Signature:	/s/ Wilmot B. Harkey
Name/Title:	Wilmot B. Harkey
Date:	05/15/2026

Daniel Mack

Signature:	/s/ Daniel Mack
Name/Title:	Daniel Mack
Date:	05/15/2026