CUSIP NO. G7S24C103

SCHEDULE 13G/A

PAGE 1 OF 10 PAGES

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 13G/A

Under the Securities Exchange Act of 1934

(Amendment No.1)*

PIONEER MERGER CORP.

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(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

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(Title of Class of Securities)

G7S24C103

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(CUSIP Number)

December 31, 2022

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(Date of Event Which Requires Filing of This Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule

is filed:

[X] Rule 13d-1(b)

[ ] Rule 13d-1(c)

[ ] Rule 13d-1(d)

* The remainder of this cover page shall be filled out for a reporting person's

initial filing on this form with respect to the subject class of securities, and

for any subsequent amendment containing information which would alter

disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed

to be "filed" for the purpose of Section 18 of the Securities Exchange Act of

1934 ("Act") or otherwise subject to the liabilities of that section of the Act

but shall be subject to all other provisions of the Act (however, see the

Notes).

CUSIP NO. G7S24C103

SCHEDULE 13G/A

PAGE 2 OF 10 PAGES

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1. NAME OF REPORTING PERSON/S.S. OR I.R.S. IDENTIFICATION

NO. OF ABOVE PERSON

WEISS ASSET MANAGEMENT LP

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2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(A) [ ]

(B) [ ]

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3. SEC USE ONLY

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4. CITIZENSHIP OR PLACE OF ORGANIZATION

DELAWARE

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5. SOLE VOTING POWER

NUMBER OF --------------------------------------------------

SHARES 6. SHARED VOTING POWER

BENEFICIALLY

OWNED BY 1,722,140

EACH --------------------------------------------------

REPORTING 7. SOLE DISPOSITIVE POWER

PERSON

WITH: 0

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8. SHARED DISPOSITIVE POWER

1,722,140

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9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,722,140

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10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES

CERTAIN SHARES* [ ]

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11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

4.28%

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12. TYPE OF REPORTING PERSON*

IA – Investment Adviser

CUSIP NO. G7S24C103

SCHEDULE 13G/A

PAGE 3 OF 10 PAGES

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1. NAME OF REPORTING PERSON/S.S. OR I.R.S. IDENTIFICATION

NO. OF ABOVE PERSON

WAM GP LLC

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2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(A) [ ]

(B) [ ]

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3. SEC USE ONLY

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4. CITIZENSHIP OR PLACE OF ORGANIZATION

DELAWARE

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5. SOLE VOTING POWER

NUMBER OF --------------------------------------------------

SHARES 6. SHARED VOTING POWER

BENEFICIALLY

OWNED BY 1,722,140

EACH --------------------------------------------------

REPORTING 7. SOLE DISPOSITIVE POWER

PERSON

WITH: 0

--------------------------------------------------

8. SHARED DISPOSITIVE POWER

1,722,140

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9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,722,140

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10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES

CERTAIN SHARES* [ ]

--------------------------------------------------------------------------------

11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

4.28%

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12. TYPE OF REPORTING PERSON*

HC – Parent Holding Company/Control Person

CUSIP NO. G7S24C103

SCHEDULE 13G/A

PAGE 4 OF 10 PAGES

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1. NAME OF REPORTING PERSON/S.S. OR I.R.S. IDENTIFICATION

NO. OF ABOVE PERSON

ANDREW M. WEISS, PH.D.

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2. CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*

(A) [ ]

(B) [ ]

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3. SEC USE ONLY

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4. CITIZENSHIP OR PLACE OF ORGANIZATION

USA

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5. SOLE VOTING POWER

NUMBER OF --------------------------------------------------

SHARES 6. SHARED VOTING POWER

BENEFICIALLY

OWNED BY 1,722,140

EACH --------------------------------------------------

REPORTING 7. SOLE DISPOSITIVE POWER

PERSON

WITH: 0

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8. SHARED DISPOSITIVE POWER

1,722,140

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9. AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

1,722,140

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10. CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES

CERTAIN SHARES* [ ]

--------------------------------------------------------------------------------

11. PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

4.28%

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12. TYPE OF REPORTING PERSON*

HC – Parent Holding Company/Control Person

CUSIP NO. G7S24C103

SCHEDULE 13G/A

PAGE 5 OF 10 PAGES

ITEM 1.

(a) Name of Issuer: PIONEER MERGER CORP.

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(b) Address of Issuer's Principal Executive Offices:

667 Madison Avenue, 19^th Floor

New York, New York 10065

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ITEM 2.

(a) and (c): Name and Citizenship of Persons Filing:

(i) Weiss Asset Management LP, a Delaware limited partnership ("Weiss Asset Management").

(ii) WAM GP LLC, a Delaware limited liability company (“WAM GP”).

(iii) Andrew M. Weiss, Ph.D., a United States citizen (“Andrew Weiss”).

(b): Address of Principal Business Office:

Weiss Asset Management, WAM GP, and Andrew Weiss have a business

address of 222 Berkeley St., 16^th floor, Boston, Massachusetts 02116

(d) Title of Class of Securities: Class A ordinary shares, par value $0.0001 per share

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(e) CUSIP Number: G7S24C103

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ITEM 3. IF THIS STATEMENT IS FILED PURSUANT TO RULE 13D-1(B), OR 13D-2(B), 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).

(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) [X] Investment Adviser registered under section 203 of the Investment

Advisers Act or under the laws of any State

(f) [ ] Employee Benefit Plan, Pension fund which is subject to the

provisions of the Employee Retirement Income Security Act of

1974 or Endowment Fund; see Section 240.13d-1(b)(1)(ii)(F)

(g) [X] A Parent Holding Company or control person, in accordance with

Section 240.13d-1(b)(ii)(G)

(h) [ ] A Savings Association 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) [ ] Group, in accordance with Section 240.13d-1(b)(1)(ii)(J)

CUSIP NO. G7S24C103

SCHEDULE 13G/A

PAGE 6 OF 10 PAGES

ITEM 4. OWNERSHIP

WEISS ASSET MANAGEMENT*

(a) Amount Beneficially Owned: 1,722,140

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(b) Percent of Class: 4.28%

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(i) sole power to vote or to direct the vote: 0

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(ii) shared power to vote or to direct the vote: 1,722,140

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(iii) sole power to dispose or to direct the disposition of: 0

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(iv) shared power to dispose or to direct the disposition of: 1,722,140

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WAM GP*

(a) Amount Beneficially Owned: 1,722,140

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(b) Percent of Class: 4.28%

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(i) sole power to vote or to direct the vote: 0

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(ii) shared power to vote or to direct the vote: 1,722,140

---------------------

(iii) sole power to dispose or to direct the disposition of: 0

----------

(iv) shared power to dispose or to direct the disposition of: 1,722,140

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ANDREW M. WEISS, PH.D.*

(a) Amount Beneficially Owned: 1,722,140

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(b) Percent of Class: 4.28%

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(i) sole power to vote or to direct the vote: 0

------------------------

(ii) shared power to vote or to direct the vote: 1,722,140

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(iii) sole power to dispose or to direct the disposition of: 0

-----------

(iv) shared power to dispose or to direct the disposition of: 1,722,140

-----------

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* Weiss Asset Management is the sole investment manager to a private investment partnership, (the “Partnership”) and private investment funds (“Funds”). WAM GP is the sole general partner of Weiss Asset Management. Andrew Weiss is the managing member of WAM GP. Shares reported for WAM GP, Andrew Weiss and Weiss Asset Management include shares beneficially owned by the Partnership and the Funds.

Each of WAM GP, Weiss Asset Management, and Andrew Weiss disclaims beneficial ownership of the shares reported herein as beneficially owned by each except to the extent of their respective pecuniary interest therein. The percent of class computations are based on 40,250,000 shares of Class A ordinary shares, $0.0001 par value, per share, as of November 9, 2022 as reported in the Form 10-Q of the Issuer, which was filed with the SEC on November 10, 2022.

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

If this statement is being filed to report the fact that as of the date

hereof the reporting person has ceased to be the beneficial owner of more than

five percent of the class of securities, check the following [X].

ITEM 6. OWNERSHIP OF MORE THAN FIVE 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

See Item 4.

ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

Not Applicable

ITEM 9. NOTICE OF DISSOLUTION OF GROUP

Not Applicable

CUSIP NO. G7S24C103

SCHEDULE 13G/A

PAGE 7 OF 10 PAGES

ITEM 10. CERTIFICATION

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.

ITEM 11. MATERIALS TO BE FILED AS EXHIBITS

Exhibit 1

Joint Filing Agreement

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I hereby

certify that the information set forth in this statement is true, complete and

correct.

Dated: February 10, 2023

WEISS ASSET MANAGEMENT LP

By: /s/ Mary Ferruolo

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Mary Ferruolo, Authorized Signatory

WAM GP LLC

By: /s/ Mary Ferruolo

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Mary Ferruolo, Authorized Signatory

ANDREW M. WEISS, PH.D.

By: /s/ Mary Ferruolo

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Mary Ferruolo, Attorney-in-Fact for Andrew Weiss***

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*** Duly authorized under Power of Attorney incorporated herein by reference to the exhibit to the Form 13G/A filed by Weiss Asset Management LP on February 3, 2023 in respect of its holding in DEEP MEDICINE ACQUISITION CORP.

CUSIP NO. G7S24C103

SCHEDULE 13G/A

PAGE 8 OF 10 PAGES

Exhibit 1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, Weiss Asset Management LP, WAM GP LLC, and Andrew M. Weiss, hereby agree to the joint filing on behalf of each of them of a statement on Schedule 13G and/or 13D (including any and all amendments thereto) with respect to the Class A ordinary shares, par value $0.0001 per share of PIONEER MERGER CORP., and further agree that this Joint Filing Agreement, as may be amended from time to time, shall be included as an Exhibit to such joint filings.

The undersigned further agree that each party hereto is responsible for the timely filing of such Statement on Schedule 13G and/or 13D and any amendments thereto, and for the accuracy and completeness of the information concerning such party contained therein; provided, however, that no party is responsible for the accuracy or completeness of the information concerning any other party, unless such party knows or has reason to believe that such information is inaccurate.

This Joint Filing Agreement may be signed in counterparts with the same effect as if the signature on each counterpart were upon the same instrument.

IN WITNESS WHEREOF, the undersigned have executed this Agreement as of February 4, 2022.

WEISS ASSET MANAGEMENT LP

By: /s/ Georgiy Nikitin

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Georgiy Nikitin, Chief Compliance Officer

WAM GP LLC

By: /s/ Georgiy Nikitin

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Georgiy Nikitin, Chief Compliance Officer

ANDREW M. WEISS, PH.D.

By: /s/ Georgiy Nikitin

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Georgiy Nikitin, Attorney-in-Fact for Andrew Weiss**

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** Duly authorized under Power of Attorney incorporated herein by reference to the exhibit to the Form 13G/A filed by Weiss Asset Management LP on January 25, 2017 in respect of its holding in Quinpario Acquisition Corp. 2.

Pioneer Merger Corp. SC 13G/A