Mason Capital updates Enviri (NYSE: NVRI) stake to 3.7% of shares

Rhea-AI Filing Summary

Mason Capital Management LLC, together with principals Kenneth M. Garschina and Michael E. Martino, reports beneficial ownership of 1,031,750 shares of Enviri Corporation common stock, equal to 3.7% of the class based on 28,103,750 shares outstanding as of June 1, 2026. All shares are held through Mason Capital Master Fund, L.P., over which the reporting persons have shared voting and dispositive power and no sole power.

The cover information reflects holdings as of the close of business on July 14, 2026. They note that as of June 1, 2026, they may have been deemed to beneficially own 1,770,959 shares, or 6.3% of the outstanding common stock. They also state that this report should not be construed as an admission of beneficial ownership for purposes of Section 13 of the Exchange Act and indicate ownership of 5 percent or less of the class.

Key Figures

Current beneficial ownership: 1,031,750 shares Current ownership percentage: 3.7% Shares outstanding: 28,103,750 shares +2 more

5 metrics

Current beneficial ownership 1,031,750 shares Enviri Corporation common shares beneficially owned by each reporting person as of close of business on July 14, 2026

Current ownership percentage 3.7% Portion of Enviri Corporation common stock class represented by 1,031,750 shares

Shares outstanding 28,103,750 shares Aggregate Enviri Corporation common stock outstanding as of June 1, 2026, used to calculate ownership percentages

Prior beneficial ownership 1,770,959 shares Enviri Corporation common shares the reporting persons may have been deemed to beneficially own as of June 1, 2026

Prior ownership percentage 6.3% Percentage of Enviri Corporation common stock represented by 1,770,959 shares as of June 1, 2026

Key Terms

beneficial ownership, shared voting power, dispositive power, Schedule 13G, +1 more

5 terms

beneficial ownership regulatory

"may have been deemed to beneficially own 1,770,959 shares of Common Stock"

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.

shared voting power regulatory

"Shared Voting Power 1,031,750.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

dispositive power regulatory

"Shared Dispositive Power 1,031,750.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Schedule 13G regulatory

"form_type: 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.

investment manager financial

"Mason Capital Management is the investment manager of Mason Capital Master Fund"

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Available on EDGAR 07/14/2026 - 04:31 PM Accepted by SEC EDGAR 07/14/2026 - 04:30 PM Learn about SEC filing dates

FAQ

What percentage of Enviri (NVRI) does Mason Capital currently own?

Mason Capital and its principals report beneficial ownership of 3.7% of Enviri’s common stock, equal to 1,031,750 shares. This percentage is based on 28,103,750 shares outstanding as of June 1, 2026, as disclosed in Enviri’s quarterly report.

How did Mason Capital’s stake in Enviri (NVRI) change over time?

As of June 1, 2026, the reporting persons may have been deemed to beneficially own 1,770,959 Enviri shares, or 6.3% of the class. By July 14, 2026, they reported 1,031,750 shares, representing 3.7% of the outstanding common stock.

Who are the reporting persons in this Enviri (NVRI) ownership report?

The reporting persons are Mason Capital Management LLC, and its managing principals Kenneth M. Garschina and Michael E. Martino. All reported Enviri common shares are directly held by Mason Capital Master Fund, L.P., for which Mason Capital Management acts as investment manager.

Through which entity does Mason Capital hold Enviri (NVRI) shares?

All reported Enviri common shares are held directly by Mason Capital Master Fund, L.P.. Mason Capital Management LLC is the investment manager of this fund and may be deemed to have beneficial ownership through its authority over voting and investment decisions.

Do the Enviri (NVRI) reporting persons have sole or shared voting power?

Each reporting person shows 0 shares with sole voting or dispositive power and 1,031,750 shares with shared voting and dispositive power. This reflects joint authority over how the Enviri shares held by Mason Capital Master Fund, L.P. are voted and managed.

Why do the Enviri (NVRI) reporting persons reference 5 percent ownership?

They indicate ownership of 5 percent or less of Enviri’s common stock, consistent with an updated stake of 3.7%. This status is relevant under Section 13 reporting rules, which distinguish between holders above and below the 5 percent ownership threshold.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Enviri Corporation

(Name of Issuer)

Common Stock, par value $0.00001 per share

(Title of Class of Securities)

29390K102

(CUSIP Number)

06/01/2026

(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): 29390K102

1

Names of Reporting Persons

Mason Capital Management 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 1,031,750.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,031,750.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,031,750.00

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)

3.7 %

12

Type of Reporting Person (See Instructions)

IA, OO

Comment for Type of Reporting Person: The information set forth on this cover page reflects information as of the close of business on July 14, 2026. As of June 1, 2026, the Reporting Person may have been deemed to beneficially own 1,770,959 shares of Common Stock (as defined in Item 2(a)), representing 6.3% of the shares of Common Stock outstanding as of such time.

SCHEDULE 13G

CUSIP Number(s): 29390K102

1

Names of Reporting Persons

Kenneth M. Garschina

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 1,031,750.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,031,750.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,031,750.00

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)

3.7 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: The information set forth on this cover page reflects information as of the close of business on July 14, 2026. As of June 1, 2026, the Reporting Person may have been deemed to beneficially own 1,770,959 shares of Common Stock, representing 6.3% of the shares of Common Stock outstanding as of such time.

SCHEDULE 13G

CUSIP Number(s): 29390K102

1

Names of Reporting Persons

Michael E. Martino

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 1,031,750.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,031,750.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

1,031,750.00

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)

3.7 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: The information set forth on this cover page reflects information as of the close of business on July 14, 2026. As of June 1, 2026, the Reporting Person may have been deemed to beneficially own 1,770,959 shares of Common Stock, representing 6.3% of the shares of Common Stock outstanding as of such time.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Enviri Corporation
(b)	Address of issuer's principal executive offices: Two Logan Square, 100-120 N. 18th Street, 17th Floor Philadelphia PA 19103
Item 2.
(a)	Name of person filing: This Schedule is being filed jointly by the following reporting persons (hereinafter sometimes collectively referred to as the "Reporting Persons"): (i) Mason Capital Management LLC, a Delaware limited liability company ("Mason Capital Management"), with respect to the common stock, par value $0.00001 per share ("Common Stock"), of Enviri Corporation directly held by Mason Capital Master Fund, L.P., a Cayman Islands exempted limited partnership ("Mason Capital Master Fund"), the general partner of which is Mason Management LLC ("Mason Management"); (ii) Kenneth M. Garschina ("Mr. Garschina"), with respect to the shares of Common Stock directly held by Mason Capital Master Fund; and (iii) Michael E. Martino ("Mr. Martino"), with respect to the shares of Common Stock directly held by Mason Capital Master Fund. Mason Capital Management is the investment manager of Mason Capital Master Fund. Mason Capital Management may be deemed to have beneficial ownership over the shares of Common Stock directly held by Mason Capital Master Fund by virtue of the authority granted to Mason Capital Management by Mason Capital Master Fund and Mason Management to vote and exercise investment discretion over such shares. Mr. Garschina and Mr. Martino are managing principals of Mason Capital Management and the sole members of Mason Management. The filing of this statement should not be construed as an admission that any Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, as amended, the beneficial owner of the shares of Common Stock reported herein.
(b)	Address or principal business office or, if none, residence: The principal business office address of Mason Capital Management, Mr. Garschina and Mr. Martino is c/o Mason Capital Management LLC, 110 East 59th Street, New York, New York 10022.
(c)	Citizenship: Mason Capital Management is a Delaware limited liability company. Messrs. Garschina and Martino are United States citizens.
(d)	Title of class of securities: Common Stock, par value $0.00001 per share
(e)	CUSIP Number(s): 29390K102
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: The information required by Item 4(a) is set forth in Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The percentages set forth in this Schedule 13G are calculated based upon an aggregate of 28,103,750 shares of Common Stock outstanding as of June 1, 2026, as reported in the Company's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, filed with the Securities and Exchange Commission on June 8, 2026.
(b)	Percent of class: 3.7%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(ii) Shared power to vote or to direct the vote: The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(iii) Sole power to dispose or to direct the disposition of: The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(iv) Shared power to dispose or to direct the disposition of: The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
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.
	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. See Item 2(a).
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 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.

Mason Capital Management LLC

Signature:	/s/ John Grizzetti
Name/Title:	John Grizzetti, Chief Operating Officer
Date:	07/14/2026

Kenneth M. Garschina

Signature:	/s/ Kenneth M. Garschina
Name/Title:	Kenneth M. Garschina, Individually
Date:	07/14/2026

Michael E. Martino

Signature:	/s/ Michael E. Martino
Name/Title:	Michael E. Martino, Individually
Date:	07/14/2026

Exhibit Information

Exhibit 99.1: Joint Filing Agreement