Polar Asset Management (BCAR) files amendment reporting 1.7% stake

Rhea-AI Filing Summary

D Boral ARC Acquisition I Corp ownership disclosure: Polar Asset Management Partners Inc., as investment advisor to Polar Multi-Strategy Master Fund, reports beneficial ownership of 488,064 Class A ordinary shares, representing 1.7% of the class. The filing states Polar has sole voting and sole dispositive power over these shares. The statement is an amendment to a prior Schedule 13G.

Insights

Institutional Ownership Analyst

Polar reports a 1.7% stake of 488,064 Class A shares with sole voting and dispositive power.

Polar Asset Management Partners Inc. files this amended Schedule 13G on behalf of Polar Multi-Strategy Master Fund, stating beneficial ownership of 488,064 shares and 1.7% of the Class A ordinary shares. The filing specifies sole voting and sole dispositive power for that quantity.

The disclosure is administrative: it records a passive investor reporting threshold below 5% and clarifies voting/dispositive authority. Subsequent SEC or company filings may show changes in position; this excerpt provides only the ownership snapshot and the reporting entity's details.

Compliance Officer

The amendment names Polar as the reporting person and confirms occupation and contact details.

The filing lists Polar's address in Toronto, Ontario, and describes its regulatory registrations with the Ontario Securities Commission. It identifies Andrew Ma as signatory, Chief Compliance Officer, and shows the statement was signed on 05/15/2026.

This amendment appears focused on accuracy and regulatory completeness rather than transaction activity; the filing labels the position as "Ownership of 5 percent or less of a class." Timing and cash‑flow details are not part of this excerpt.

Key Figures

Beneficial ownership: 488,064 shares Percent of class: 1.7% Sole voting power: 488,064 shares +2 more

5 metrics

Beneficial ownership 488,064 shares Class A ordinary shares

Percent of class 1.7% Percent of Class A ordinary shares

Sole voting power 488,064 shares Number with sole voting power

Sole dispositive power 488,064 shares Number with sole dispositive power

Signing date 05/15/2026 Signature date on amendment

Key Terms

Schedule 13G/A, beneficial ownership, sole dispositive power, CUSIP

4 terms

Schedule 13G/A regulatory

"This statement is filed by Polar Asset Management Partners Inc."

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 ownership regulatory

"Amount beneficially owned: 488064 (b) Percent of class: 1.7 %"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 488064"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

CUSIP financial

"CUSIP No.: G2616F101"

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.

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Accepted by SEC EDGAR 05/15/2026 - 11:43 AM Learn about SEC filing dates

FAQ

What stake does Polar Asset Management report in BCAR?

Polar Asset Management reports beneficial ownership of 488,064 Class A ordinary shares, representing 1.7% of the class. The filing states Polar holds sole voting and sole dispositive power over these shares.

Who holds voting and dispositive power for the reported shares?

The filing states the reporting person has sole voting power and sole dispositive power over 488,064 shares. Shared voting or dispositive power is recorded as 0 in the disclosure.

Which entity is the reporting person on this Schedule 13G/A?

The reporting person is Polar Asset Management Partners Inc., which files on behalf of Polar Multi-Strategy Master Fund and is incorporated in Ontario, Canada with an office at 16 York Street, Toronto.

Does this filing indicate an active transaction or a passive holding?

The amendment is a Schedule 13G filing, indicating a reported ownership position. It classifies the holder under "Ownership of 5 percent or Less of a Class," which reflects a passive reporting status rather than an active transaction.

When was the Schedule 13G/A signed and by whom?

The document is signed by Andrew Ma, Chief Compliance Officer, with the signature date shown as 05/15/2026. The cover indicates an amendment and lists the issuer as D Boral ARC Acquisition I Corp.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

D Boral ARC Acquisition I Corp

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G2616F101

(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): G2616F101

1

Names of Reporting Persons

Polar Asset Management Partners Inc.

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

ONTARIO, CANADA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 488,064.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 488,064.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

488,064.00

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)

1.7 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: D Boral ARC Acquisition I Corp
(b)	Address of issuer's principal executive offices: 10 East 53rd Street, Suite 3001, New York, NY, 10022
Item 2.
(a)	Name of person filing: This statement is filed by Polar Asset Management Partners Inc., a company incorporated under the laws of Ontario, Canada, which serves as the investment advisor to Polar Multi-Strategy Master Fund, a Cayman Islands exempted company ("PMSMF") with respect to the shares directly held by PMSMF.
(b)	Address or principal business office or, if none, residence: 16 York Street, Suite 2900, Toronto, Ontario, M5J 0E6
(c)	Citizenship: Canada
(d)	Title of class of securities: Class A ordinary shares, par value $0.0001 per share
(e)	CUSIP No.: G2616F101
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).
	The Reporting Person is an investment fund manager, portfolio manager, exempt market dealer and commodity trading manager registered with the Ontario Securities Commission.
Item 4.	Ownership
(a)	Amount beneficially owned: 488064
(b)	Percent of class: 1.7 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 488064
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 488064
	(iv) Shared power to dispose or to direct the disposition of: 0
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.

Polar Asset Management Partners Inc.

Signature:	Andrew Ma
Name/Title:	Chief Compliance Officer
Date:	05/15/2026