Casella Waste Systems: Wasatch reports 4.9% stake

The reported stake is 4.9% of the class, within the filing's 5%-or-less ownership category.

Rhea-AI Filing Summary

Casella Waste Systems Inc (CWST) ownership amendment reports that Wasatch Advisors beneficially owned 3,056,089 shares of common stock, equal to 4.9% of the class, as of September 30, 2026. Wasatch Advisors reported sole voting power over 2,106,156 shares and sole dispositive power over 3,056,089 shares, with no shared voting or dispositive power. The reported ownership is in the filing's 5%-or-less category.

Key Figures

Beneficially owned shares: 3,056,089 shares Percent of class: 4.9% Sole voting power: 2,106,156 shares +3 more

6 metrics

Beneficially owned shares 3,056,089 shares Casella Waste Systems Inc common stock as of September 30, 2026

Percent of class 4.9% Ownership reported by Wasatch Advisors

Sole voting power 2,106,156 shares Casella Waste Systems Inc common stock

Sole dispositive power 3,056,089 shares Casella Waste Systems Inc common stock

Shared voting power 0 shares Reported by Wasatch Advisors

Shared dispositive power 0 shares Reported by Wasatch Advisors

Key Terms

beneficially owned, Sole Voting Power, Sole Dispositive Power

3 terms

beneficially owned financial

"Amount beneficially owned: 3,056,089"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

Sole Voting Power financial

"Sole Voting Power 2,106,156.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

Sole Dispositive Power financial

"Sole Dispositive Power 3,056,089.00"

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.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

How many CWST shares did Wasatch Advisors report owning?

Wasatch Advisors reported beneficial ownership of 3,056,089 shares of Casella Waste Systems Inc common stock, representing 4.9% of the class as of September 30, 2026.

How many CWST shares did Wasatch Advisors have voting and dispositive power over?

Wasatch Advisors reported sole voting power over 2,106,156 shares and sole dispositive power over 3,056,089 shares. It reported zero shared voting power and zero shared dispositive power.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 10/09/2026 - 02:56 PM Accepted by SEC EDGAR 10/09/2026 - 02:55 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Casella Waste Systems Inc

(Name of Issuer)

Common Stock SH

(Title of Class of Securities)

147448104

(CUSIP Number)

09/30/2026

(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): 147448104

1

Names of Reporting Persons

Wasatch Advisors 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 2,106,156.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,056,089.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,056,089.00

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)

4.9 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Casella Waste Systems Inc
(b)	Address of issuer's principal executive offices: 25 Green Hill Lane, Rutland, US-VT, 05701, US
Item 2.
(a)	Name of person filing: Wasatch Advisors LP
(b)	Address or principal business office or, if none, residence: 505 Wakara Way, 3rd Floor, Salt Lake City, 84108, United States
(c)	Citizenship: DELAWARE
(d)	Title of class of securities: Common Stock SH
(e)	CUSIP No.: 147448104
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: 3,056,089
(b)	Percent of class: 4.9 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 2,106,156
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 3,056,089
	(iv) Shared power to dispose or to direct the disposition of: 0
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.
	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.

Wasatch Advisors LP

Signature:	Mike Yeates
Name/Title:	CEO
Date:	10/09/2026