Polar Asset reports 1.5M ARTC shares disclosed (ARTC)

Rhea-AI Filing Summary

Art Technology Acquisition Corp ownership disclosure: Polar Asset Management Partners Inc. reports beneficial ownership of 1,500,000 Class A ordinary shares, representing 5.7% of the class as reported in a Schedule 13G. The filing lists sole voting and sole dispositive power over these shares as of 03/31/2026.

Insights

Institutional Ownership Specialist

Large passive stake disclosed: 1.5M shares, 5.7% ownership.

Polar Asset Management reports it holds 1,500,000 shares with sole voting and dispositive power, identifying the holding vehicle as Polar Multi-Strategy Master Fund. The filing is a standard beneficial-ownership disclosure under Schedule 13G.

Timing is anchored to 03/31/2026 with the statement signed 05/15/2026. Subsequent filings would show any changes; the current disclosure does not state trading intent or planned transactions.

Key Figures

Shares beneficially owned: 1,500,000 shares Percent of class: 5.7% CUSIP: G0579E103 +1 more

4 metrics

Shares beneficially owned 1,500,000 shares Amount beneficially owned as of 03/31/2026

Percent of class 5.7% Percent of Class A ordinary shares

CUSIP G0579E103 Class A ordinary shares CUSIP

Signature date 05/15/2026 Date filing was signed by Chief Compliance Officer

Key Terms

Schedule 13G, beneficial ownership, sole dispositive power

3 terms

Schedule 13G regulatory

"reports beneficial ownership of 1,500,000 shares in a 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.

beneficial ownership financial

"Amount beneficially owned: 1500000 (b) Percent of class: 5.7 %"

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 legal

"Sole power to dispose or to direct the disposition of: 1500000"

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.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Art Technology Acquisition Corp

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G0579E103

(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): G0579E103

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 1,500,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 1,500,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,500,000.00

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)

5.7 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Art Technology Acquisition Corp
(b)	Address of issuer's principal executive offices: 2929 Arch Street, Suite 1703, Philadelphia, PA, 19104
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 Number(s): G0579E103
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: 1500000
(b)	Percent of class: 5.7 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1500000
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 1500000
	(iv) Shared power to dispose or to direct the disposition of: 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.

Polar Asset Management Partners Inc.

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

FAQ

What stake does Polar Asset report in Art Technology Acquisition Corp (ARTC)?

Polar Asset reports beneficial ownership of 1,500,000 Class A ordinary shares, equal to 5.7% of the class. The filing states sole voting and sole dispositive power over these shares and cites an ownership date of 03/31/2026.

Which entity holds the shares on behalf of Polar Asset in ARTC?

The Schedule 13G identifies Polar Multi-Strategy Master Fund as the direct holder for the disclosed position. Polar Asset Management Partners Inc. files as the investment advisor with authority over the shares, per the disclosure language.

Does the filing state whether Polar Asset will buy or sell more ARTC shares?

The disclosure lists ownership and voting/dispositive power but does not state any plans to buy or sell additional shares. It is a passive beneficial-ownership statement and does not specify trading intent or transaction plans.

What dates are relevant in the Polar Asset Schedule 13G for ARTC?

The ownership is reported as of 03/31/2026, and the filing is signed by the Chief Compliance Officer on 05/15/2026. Those dates anchor the reported share count and the signature certifying the statement.