Decagon Asset Management (OACC) discloses 5.52% holding in Class A shares

Rhea-AI Filing Summary

Decagon Asset Management LLP and Benjamin John Durham report beneficial ownership of Class A ordinary shares of Oaktree Acquisition Corp. III Life Sciences. They collectively hold 1,091,327 shares, representing 5.52% of the outstanding Class A shares. They report sole voting and sole dispositive power over all 1,091,327 shares, with no shared voting or dispositive power.

Key Figures

Beneficial ownership: 1,091,327 shares Percent of class: 5.52% Sole voting power: 1,091,327 shares +1 more

4 metrics

Beneficial ownership 1,091,327 shares Class A ordinary shares beneficially owned by Decagon Asset Management LLP and Benjamin John Durham

Percent of class 5.52% Percentage of Oaktree Acquisition Corp. III Life Sciences Class A shares beneficially owned

Sole voting power 1,091,327 shares Shares over which each reporting person has sole power to vote or direct the vote

Sole dispositive power 1,091,327 shares Shares over which each reporting person has sole power to dispose or direct disposition

Key Terms

beneficially owned, sole voting power, dispositive power, Schedule 13G

4 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 1,091,327"

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.

sole voting power financial

"5 | Sole Voting Power 1,091,327.00 6 | Shared Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

dispositive power financial

"Sole Dispositive Power 1,091,327.00 8 | Shared Dispositive Power 0.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Schedule 13G regulatory

"form_type": "SCHEDULE 13G""

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

How many OACC shares does Decagon Asset Management LLP report owning?

Decagon Asset Management LLP reports beneficial ownership of 1,091,327 Class A shares of Oaktree Acquisition Corp. III Life Sciences, with sole voting and sole dispositive power over the entire position and no shared authority reported.

What percentage of OACC’s Class A shares is held by Decagon and Benjamin John Durham?

Decagon Asset Management LLP and Benjamin John Durham report holding 5.52% of OACC’s Class A ordinary shares. This stake gives them sole voting and sole dispositive power over 1,091,327 shares, with no shared voting or dispositive power.

Who are the reporting persons on this Schedule 13G for OACC?

The reporting persons are Decagon Asset Management LLP and Benjamin John Durham. Both report beneficial ownership of 1,091,327 Class A shares of OACC with sole voting and sole dispositive power and no shared authority over the position.

What type of security in OACC is reported on this Schedule 13G?

The filing covers Class A ordinary shares, par value $0.0001 per share, of Oaktree Acquisition Corp. III Life Sciences. The reporting persons disclose beneficial ownership and related voting and dispositive powers for this specific class of OACC securities.

Does Decagon share voting or dispositive power over its OACC stake?

No. Decagon Asset Management LLP and Benjamin John Durham each report sole voting power and sole dispositive power over 1,091,327 shares of OACC and zero shared voting or shared dispositive power for the reported Class A share position.

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Available on EDGAR 08/14/2026 - 05:12 PM Accepted by SEC EDGAR 08/14/2026 - 05:11 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Oaktree Acquisition Corp. III Life Sciences

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G6717R104

(CUSIP Number)

06/30/2026

(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): G6717R104

1

Names of Reporting Persons

Decagon Asset Management LLP

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 KINGDOM

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,091,327.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,091,327.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,091,327.00

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)

5.52 %

12

Type of Reporting Person (See Instructions)

IA, PN

SCHEDULE 13G

CUSIP Number(s): G6717R104

1

Names of Reporting Persons

Benjamin John Durham

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 KINGDOM

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,091,327.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,091,327.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,091,327.00

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)

5.52 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Oaktree Acquisition Corp. III Life Sciences
(b)	Address of issuer's principal executive offices: 333 SOUTH GRAND AVENUE, 28TH FLOOR, LOS ANGELES, CALIFORNIA 90071
Item 2.
(a)	Name of person filing: Decagon Asset Management LLP Benjamin John Durham
(b)	Address or principal business office or, if none, residence: 5 SWALLOW PLACE LONDON, United Kingdom W1B 2AF
(c)	Citizenship: Decagon Asset Management LLP - UNITED KINGDOM Benjamin John Durham - UNITED KINGDOM
(d)	Title of class of securities: Class A ordinary shares, par value $0.0001 per share
(e)	CUSIP Number(s): G6717R104
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: 1,091,327
(b)	Percent of class: 5.52 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Decagon Asset Management LLP - 1,091,327 Benjamin John Durham - 1,091,327
	(ii) Shared power to vote or to direct the vote: Decagon Asset Management LLP - 0 Benjamin John Durham - 0
	(iii) Sole power to dispose or to direct the disposition of: Decagon Asset Management LLP - 1,091,327 Benjamin John Durham - 1,091,327
	(iv) Shared power to dispose or to direct the disposition of: Decagon Asset Management LLP - 0 Benjamin John Durham - 0
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.
	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.

Decagon Asset Management LLP

Signature:	Olivia Cooper
Name/Title:	Olivia Cooper COO
Date:	08/14/2026

Benjamin John Durham

Signature:	Ben Durham
Name/Title:	Ben Durham, CIO
Date:	08/03/2026