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Ambipar Emergency Response (AMBI): Schedule 13G filed reporting that Riva Ridge Capital Management LP, Riva Ridge Master Fund, Ltd., Riva Ridge GP LLC, Stephen Golden, and Peter Finelli beneficially own 1,235,816 Class A Ordinary Shares, representing 7.1% of the class.
The reported amount includes 1,137,810 warrants, each exercisable for one Class A Ordinary Share. The filers report shared voting and dispositive power over 1,235,816 and no sole power. The securities are held by advisory clients of Riva Ridge Capital Management LP; among them, Riva Ridge Master Fund, Ltd. is identified as potentially holding more than 5%. The certification states the holdings were not acquired to change or influence control. The event date is October 29, 2025.
Insights
Passive 7.1% stake disclosed via shares and warrants.
Riva Ridge and affiliates report beneficial ownership of 7.1% of AMBI, equal to 1,235,816 securities, including 1,137,810 warrants exercisable into Class A shares. They list shared voting and dispositive power over the full amount and no sole power.
The certification indicates a passive filing posture, stating the holdings were not acquired to change or influence control. Securities are held by advisory clients of Riva Ridge Capital Management LP, with Riva Ridge Master Fund, Ltd. identified among holders exceeding 5%.
The impact depends on holder decisions and market conditions; no transaction terms or proceeds are involved. The event date is October 29, 2025.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What stake in AMBI did Riva Ridge report?
They reported beneficial ownership of 7.1%, equal to 1,235,816 Class A Ordinary Shares.
How many AMBI warrants are included in the reported holdings?
The filing includes 1,137,810 warrants, each exercisable for one Class A Ordinary Share.
Do the filers have sole or shared voting power over AMBI shares?
They report shared voting and dispositive power over 1,235,816 and no sole power.
Is this a passive or activist AMBI stake?
The certification states the securities were not acquired to change or influence control, indicating a passive stake.
Who directly holds the reported AMBI securities?
They are held by advisory clients of Riva Ridge Capital Management LP; Riva Ridge Master Fund, Ltd. may hold more than 5%.
What is the event date tied to this 13G?
The event date is October 29, 2025.
Which class of AMBI securities is covered?
The filing covers Class A Ordinary Shares, par value $0.0001 per share (CUSIP G02532102).
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Ambipar Emergency Response
(Name of Issuer)
Class A Ordinary Shares, par value $0.0001 per share
(Title of Class of Securities)
G02532102
(CUSIP Number)
10/29/2025
(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 No.
G02532102
1
Names of Reporting Persons
Riva Ridge Capital Management LP
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
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,235,816.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,235,816.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,235,816.00
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)
7.1 %
12
Type of Reporting Person (See Instructions)
IA, PN
SCHEDULE 13G
CUSIP No.
G02532102
1
Names of Reporting Persons
Riva Ridge Master Fund, Ltd.
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
CAYMAN ISLANDS
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,235,816.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,235,816.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,235,816.00
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)
7.1 %
12
Type of Reporting Person (See Instructions)
CO
SCHEDULE 13G
CUSIP No.
G02532102
1
Names of Reporting Persons
Riva Ridge GP LLC
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
DELAWARE
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,235,816.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,235,816.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,235,816.00
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)
7.1 %
12
Type of Reporting Person (See Instructions)
HC, OO
SCHEDULE 13G
CUSIP No.
G02532102
1
Names of Reporting Persons
Stephen Golden
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 STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,235,816.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,235,816.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,235,816.00
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)
7.1 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
CUSIP No.
G02532102
1
Names of Reporting Persons
Peter Finelli
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 STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
1,235,816.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
1,235,816.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
1,235,816.00
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)
7.1 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Ambipar Emergency Response
(b)
Address of issuer's principal executive offices:
Avenida Angelica, N. 2346, 5th Floor, Room 4, Consolacao, Sao Paulo, Brazil 01228-200
Item 2.
(a)
Name of person filing:
Riva Ridge Capital Management LP
Riva Ridge Master Fund, Ltd.
Riva Ridge GP LLC
Stephen Golden
Peter Finelli
(b)
Address or principal business office or, if none, residence:
Riva Ridge Capital Management LP
55 Fifth Avenue, 18th Floor
New York, New York 10003
United States of America
Riva Ridge Master Fund, Ltd.
c/o Walkers Corporate Limited
190 Elgin Avenue
George Town, Grand Cayman KY1-9008
Cayman Islands
Riva Ridge GP LLC
55 Fifth Avenue, 18th Floor
New York, New York 10003
United States of America
Stephen Golden
c/o Riva Ridge Capital Management LP
55 Fifth Avenue, 18th Floor
New York, New York 10003
United States of America
Peter Finelli
c/o Riva Ridge Capital Management LP
55 Fifth Avenue, 18th Floor
New York, New York 10003
United States of America
(c)
Citizenship:
Riva Ridge Capital Management LP - Delaware
Riva Ridge Master Fund, Ltd. - Cayman Islands
Riva Ridge GP LLC - Delaware
Stephen Golden - United States
Peter Finelli - United States
(d)
Title of class of securities:
Class A Ordinary Shares, par value $0.0001 per share
(e)
CUSIP No.:
G02532102
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:
Items 6, 8, 9 and 11 of each of the cover pages for each Reporting Person in this Schedule 13G include 1,137,810 warrants beneficially owned by the Reporting Persons, each exercisable for 1 Class A Ordinary Share, $0.0001 par value.
Riva Ridge Capital Management LP - 1,235,816
Riva Ridge Master Fund, Ltd. - 1,235,816
Riva Ridge GP LLC - 1,235,816
Stephen Golden - 1,235,816
Peter Finelli - 1,235,816
(b)
Percent of class:
Riva Ridge Capital Management LP - 7.1%
Riva Ridge Master Fund, Ltd. - 7.1%
Riva Ridge GP LLC - 7.1%
Stephen Golden - 7.1%
Peter Finelli - 7.1%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
Riva Ridge Capital Management LP - 0
Riva Ridge Master Fund, Ltd. - 0
Riva Ridge GP LLC - 0
Stephen Golden - 0
Peter Finelli - 0
(ii) Shared power to vote or to direct the vote:
Riva Ridge Capital Management LP - 1,235,816
Riva Ridge Master Fund, Ltd. - 1,235,816
Riva Ridge GP LLC - 1,235,816
Stephen Golden - 1,235,816
Peter Finelli - 1,235,816
(iii) Sole power to dispose or to direct the disposition of:
Riva Ridge Capital Management LP - 0
Riva Ridge Master Fund, Ltd. - 0
Riva Ridge GP LLC - 0
Stephen Golden - 0
Peter Finelli - 0
(iv) Shared power to dispose or to direct the disposition of:
Riva Ridge Capital Management LP - 1,235,816
Riva Ridge Master Fund, Ltd. - 1,235,816
Riva Ridge GP LLC - 1,235,816
Stephen Golden - 1,235,816
Peter Finelli - 1,235,816
Item 5.
Ownership of 5 Percent or Less of a Class.
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
All of the securities reported in this Schedule 13G are directly owned by advisory clients of Riva Ridge Capital Management LP. None of those advisory clients, other than Riva Ridge Master Fund, Ltd., may be deemed to beneficially own more than 5% of the Class A Ordinary Shares, $0.0001 par value.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
Please see Exhibit B attached hereto.
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 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.
Riva Ridge Capital Management LP
Signature:
/s/ Stephen Golden*
Name/Title:
Stephen Golden / Managing Member of the General Partner
Date:
11/05/2025
Riva Ridge Master Fund, Ltd.
Signature:
/s/ Stephen Golden*
Name/Title:
Stephen Golden / Director
Date:
11/05/2025
Riva Ridge GP LLC
Signature:
/s/ Stephen Golden*
Name/Title:
Stephen Golden / Managing Member
Date:
11/05/2025
Stephen Golden
Signature:
/s/ Stephen Golden*
Name/Title:
Stephen Golden
Date:
11/05/2025
Peter Finelli
Signature:
/s/ Peter Finelli*
Name/Title:
Peter Finelli
Date:
11/05/2025
Comments accompanying signature: * Each Reporting Person disclaims beneficial ownership of the reported securities except to the extent of his, her or its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.
To the extent that "ownership of 5 percent or less of a class" was indicated in Item 5, such response only applies to the Reporting Person(s) that indicated elsewhere herein that it beneficially owns five percent (5%) or less of the class.
Exhibit Information
Exhibit A - Joint Filing Agreement
Exhibit B - Control Person Identification
