SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Pioneer Acquisition I Corp

(Name of Issuer)

Class A ordinary shares, $0.0001 par value per share

(Title of Class of Securities)

G7117W107

(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)

SCHEDULE 13G

CUSIP Number(s):

G7117W107

Names of Reporting Persons

Westchester Capital Management, LLC

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 95,758.00
6	Shared Voting Power 1,152,746.00
7	Sole Dispositive Power 95,758.00
8	Shared Dispositive Power 1,152,746.00

Aggregate Amount Beneficially Owned by Each Reporting Person

1,248,504.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

5.65 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP Number(s):

G7117W107

Names of Reporting Persons

Westchester Capital Partners, LLC

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 10,108.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 10,108.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

10,108.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0.05 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP Number(s):

G7117W107

Names of Reporting Persons

Virtus Investment Advisers, LLC

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 1,152,746.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,152,746.00

Aggregate Amount Beneficially Owned by Each Reporting Person

1,152,746.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

5.21 %

Type of Reporting Person (See Instructions)

Comment for Type of Reporting Person: * Based on 22,114,799 Shares outstanding as of March 26, 2026, as reported in the Issuer's Annual Report on Form 10-K filed with the Securities and Exchange Commission on March 26, 2026. The amounts reported on this page are also included in the amounts reported by Westchester Capital Management, LLC on this Schedule 13G.

SCHEDULE 13G

Item 1.

(a)

Name of issuer:

Pioneer Acquisition I Corp

(b)

Address of issuer's principal executive offices:

131 Concord Street, Brooklyn, NY 11201

Item 2.

(a)

Name of person filing:

This statement is being filed jointly by the following (each, a "Reporting Person," and collectively, the "Reporting Persons"): Westchester Capital Management, LLC ("Westchester"), a Delaware limited liability company, Westchester Capital Partners, LLC ("WCP"), a Delaware limited liability company, and Virtus Investment Advisers, LLC ("Virtus"), a Delaware limited liability company. Virtus, a registered investment adviser, serves as the investment adviser to The Merger Fund ("MF"), The Merger Fund VL ("MF VL"), Virtus Westchester Event-Driven Fund ("EDF") and Virtus Westchester Credit Event Fund ("CEF"). Westchester, a registered investment adviser, serves as sub-advisor to each of MF, MF VL, EDF, CEF, JNL/Westchester Capital Event Driven Fund ("JNL"), JNL Multi-Manager Alternative Fund ("JARB") and Principal Funds, Inc. - Global Multi-Strategy Fund ("PRIN"). WCP, a registered investment adviser, serves as investment adviser to Westchester Capital Master Trust ("Master Trust", together with MF, MF VL, EDF, CEF, JNL, JARB and PRIN, the "Funds"). The Funds directly hold Ordinary Shares of the Company for the benefit of the investors in those Funds. Mr. Roy Behren and Mr. Michael T. Shannon each serve as Co-Presidents of Westchester and WCP. Westchester and WCP often make acquisitions in, and dispose of, securities of an issuer on the same terms and conditions and at the same time. Based on the foregoing and the relationships described herein, these parties may be deemed to constitute a "group" for purposes of Section 13(g)(3) of the Act. The filing of this statement shall not be construed as an admission that the Reporting Persons are a group, or have agreed to act as a group.

(b)

Address or principal business office or, if none, residence:

Westchester Capital Management, LLC 100 Summit Lake Drive, Valhalla, NY 10595 Westchester Capital Partners, LLC 100 Summit Lake Drive, Valhalla, NY 10595 Virtus Investment Advisers, LLC One Financial Plaza, Hartford, CT 06103

(c)

Citizenship:

Each of Westchester, WCP and Virtus are organized under the laws of the State of Delaware.

(d)

Title of class of securities:

Class A ordinary shares, $0.0001 par value per share

(e)

CUSIP Number(s):

G7117W107

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:

Westchester Capital Management, LLC: 1,248,504 Westchester Capital Partners, LLC: 10,108 Virtus Investment Advisers, LLC: 1,152,746

(b)

Percent of class:

Westchester Capital Management, LLC: 5.65% Westchester Capital Partners, LLC: 0.05% Virtus Investment Advisers, LLC: 5.21%

(c)

Number of shares as to which the person has:

(i) Sole power to vote or to direct the vote:

Westchester Capital Management, LLC: 95,758 Westchester Capital Partners, LLC: 10,108 Virtus Investment Advisers, LLC: 0

(ii) Shared power to vote or to direct the vote:

Westchester Capital Management, LLC: 1,152,746 Westchester Capital Partners, LLC: 0 Virtus Investment Advisers, LLC: 1,152,746

(iii) Sole power to dispose or to direct the disposition of:

Westchester Capital Management, LLC: 95,758 Westchester Capital Partners, LLC: 10,108 Virtus Investment Advisers, LLC: 0

(iv) Shared power to dispose or to direct the disposition of:

Westchester Capital Management, LLC: 1,152,746 Westchester Capital Partners, LLC: 0 Virtus Investment Advisers, LLC: 1,152,746

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.

Westchester Capital Management, LLC

Signature:	/s/ CaSaundra Wu
Name/Title:	CaSaundra Wu/Chief Compliance Officer
Date:	05/15/2026

Westchester Capital Partners, LLC

Signature:	/s/ CaSaundra Wu
Name/Title:	CaSaundra Wu/Chief Compliance Officer
Date:	05/15/2026

Virtus Investment Advisers, LLC

Signature:	/s/ Chetram Persaud
Name/Title:	Chetram Persaud/Chief Compliance Officer
Date:	05/15/2026

SEC Form SCHEDULE 13G filed by Pioneer Acquisition I Corp