HLXC: ADAR1 reports 1,000,000‑share stake

Accepted by SEC EDGAR 05/15/2026 - 07:59 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Helix Acquisition Corp. III Schedule 13G reports that ADAR1 Capital Management, LLC and Daniel Schneeberger together beneficially own 1,000,000 Class A ordinary shares of the issuer, representing 5.6% of the 17,747,500 ordinary shares outstanding as of March 31, 2026.

The filing states the total includes 875,306 shares held by ADAR1 Partners, LP and 124,694 shares held by Spearhead Insurance Solutions IDF, LLC; ADAR1 Capital Management is the investment manager and Mr. Schneeberger may be deemed to indirectly beneficially own those shares.

Insights

Securities Compliance Counsel

Filing discloses passive beneficial ownership above 5% threshold.

The Schedule 13G shows a 5.6% beneficial position based on the issuer's reported 17,747,500 outstanding shares as of March 31, 2026. The statement attributes ownership indirectly via advisory and sub‑advisory relationships.

Disclosure aligns with passive investor reporting; subsequent Form 13D/13G amendments may be required if ownership status or intentions change.

Institutional Investor Relations Analyst

Position size is modestly material but not controlling.

A 1,000,000‑share holding equals 5.6% of outstanding stock, large enough to require public filing yet below control thresholds. The breakdown shows holdings through two entities, clarifying aggregation of indirect ownership.

Market impact depends on holder activity; voting and disposition powers are disclosed as shared.

Key Figures

Beneficial ownership: 1,000,000 shares Percent of class: 5.6% Shares outstanding: 17,747,500 shares +2 more

5 metrics

Beneficial ownership 1,000,000 shares Reported beneficially owned by ADAR1/Schneeberger

Percent of class 5.6% Based on 17,747,500 shares outstanding as of March 31, 2026

Shares outstanding 17,747,500 shares Outstanding as of <date>March 31, 2026</date> per issuer Form 10‑Q

ADAR1 Partners holding 875,306 shares Held by ADAR1 Partners, LP as disclosed

Spearhead holding 124,694 shares Held by Spearhead Insurance Solutions IDF, LLC as disclosed

Key Terms

beneficially own, shared dispositive power, Schedule 13G

3 terms

beneficially own regulatory

"ADAR1 Capital Management, LLC may be deemed to indirectly beneficially own securities held by ADAR1 Partners"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

shared dispositive power regulatory

"Shared Dispositive Power 1,000,000.00"

Schedule 13G regulatory

"This Schedule is being filed on behalf of each of the following persons"

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.

FAQ

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

What stake does ADAR1 Capital Management hold in Helix Acquisition Corp. III (HLXC)?

ADAR1 Capital Management and Daniel Schneeberger report beneficial ownership of 1,000,000 shares, representing 5.6% of the company's 17,747,500 outstanding shares as of March 31, 2026. The position aggregates shares held via affiliated entities.

How is the 1,000,000‑share position broken down in the filing?

The filing states the 1,000,000 shares include 875,306 shares held by ADAR1 Partners, LP and 124,694 shares held by Spearhead Insurance Solutions IDF, LLC, with ADAR1 acting as investment manager or sub‑advisor to those entities.

Does the Schedule 13G indicate direct voting or disposition power for ADAR1/Schneeberger?

The cover data shows shared voting power of 1,000,000 shares and shared dispositive power of 1,000,000 shares. The filing attributes indirect beneficial ownership through advisory relationships rather than sole direct control.

What outstanding share count does the filing use to calculate the 5.6% stake?

The filing bases the percentage on 17,747,500 ordinary shares outstanding as of March 31, 2026, as reported in the issuer's Form 10‑Q for the quarter ended March 31, 2026, filed May 15, 2026.

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

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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

ADAR1 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

TEXAS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,000,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,000,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,000,000.00

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)

5.6 %

12

Type of Reporting Person (See Instructions)

IA, OO

Comment for Type of Reporting Person: Includes (i) 875,306 Class A ordinary shares, par value $0.0001 per share ("Ordinary Shares") held by ADAR1 Partners, LP and (ii) 124,694 Ordinary Shares held by Spearhead Insurance Solutions IDF, LLC as of March 31, 2026. As the investment manager of ADAR1 Partners, LP and as the sub-advisor of Spearhead Insurance Solutions IDF, LLC, ADAR1 Capital Management, LLC may be deemed to indirectly beneficially own securities held by ADAR1 Partners, LP and Spearhead Insurance Solutions IDF, LLC. Based on 17,747,500 Ordinary Shares of Helix Acquisition Corp. III (the "Issuer") outstanding as of March 31, 2026, reported in the Issuer's Form 10Q for the quarter ended March 31, 2026, filed with the Securities and Exchange Commission on May 15, 2026.

SCHEDULE 13G

CUSIP Number(s): G4444S107

1

Names of Reporting Persons

Daniel Schneeberger

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

SWITZERLAND

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,000,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,000,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,000,000.00

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)

5.6 %

12

Type of Reporting Person (See Instructions)

HC, IN

Comment for Type of Reporting Person: Includes (i) 875,306 Class A ordinary shares, par value $0.0001 per share ("Ordinary Shares") held by ADAR1 Partners, LP and (ii) 124,694 Ordinary Shares held by Spearhead Insurance Solutions IDF, LLC as of March 31, 2026. As the manager of ADAR1 Capital Management, LLC, Mr. Schneeberger may be deemed to indirectly beneficially own securities held by ADAR1 Partners, LP and Spearhead Insurance Solutions IDF, LLC. Based on 17,747,500 Ordinary Shares of Helix Acquisition Corp. III (the "Issuer") outstanding as of March 31, 2026, reported in the Issuer's Form 10Q for the quarter ended March 31, 2026, filed with the Securities and Exchange Commission on May 15, 2026.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Helix Acquisition Corp. III
(b)	Address of issuer's principal executive offices: 200 Clarendon Street, 52nd Floor, Boston, MA 02116
Item 2.
(a)	Name of person filing: This Schedule is being filed on behalf of each of the following persons (each, a "Reporting Person" and collectively, the "Reporting Persons"): (i) ADAR1 Capital Management, LLC ("ADAR1 Capital Management"); and (ii) Daniel Schneeberger ("Mr. Schneeberger").
(b)	Address or principal business office or, if none, residence: The address of the principal business office of each of the Reporting Persons is 3503 Wild Cherry Drive, Building 9, Austin, Texas 78738.
(c)	Citizenship: (i) ADAR1 Capital Management is a Texas limited liability company; and (ii) Mr. Schneeberger is a citizen of Switzerland.
(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: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
(b)	Percent of class: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
	(ii) Shared power to vote or to direct the vote: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
	(iii) Sole power to dispose or to direct the disposition of: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
	(iv) Shared power to dispose or to direct the disposition of: The information contained on the cover pages of this Schedule 13G is incorporated herein by reference.
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. Mr. Schneeberger is filing this Schedule 13G as a control person in respect of shares beneficially owned by ADAR1 Capital Management, an investment adviser as described in SS 240.13d-1(b)(1)(ii)(E).
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.

ADAR1 Capital Management, LLC

Signature:	/s/ Daniel Schneeberger
Name/Title:	Daniel Schneeberger, Manager
Date:	05/15/2026

Daniel Schneeberger

Signature:	/s/ Daniel Schneeberger
Name/Title:	Daniel Schneeberger, in his individual capacity
Date:	05/15/2026

Exhibit Information

Exhibit A: Joint Filing Agreement