CLH SEC Filings: 8-K, 10-Q, S-3 & 424B – Clean Harbors

Financials

TYPE

HEADLINE

FILED AT

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Oct 28, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Jul 29, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

May 6, 2026

10-K

Form 10-K - Annual report [Section 13 and 15(d), not S-K Item 405]

Feb 18, 2026

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Oct 29, 2025

10-Q

Form 10-Q - Quarterly report [Sections 13 or 15(d)]

Jul 30, 2025

News

TYPE

HEADLINE

FILED AT

8-K

Clean Harbors Reports Record Third-Quarter 2026 Results, Raises Full-Year Guidance, and Announces Executive Transition

Oct 28, 2026

8-K

Clean Harbors Completes Acquisitions of EnviroServe and ES&H for $775 Million

Oct 5, 2026

8-K

Clean Harbors Announces $600 Million Senior Notes Offering

Sep 18, 2026

8-K

Clean Harbors to Acquire EnviroServe for $470 Million

Aug 12, 2026

8-K

Clean Harbors Reports Record Q2 2026 Financial Results and Announces Strategic Acquisition of ES&H

Jul 29, 2026

8-K

Clean Harbors, Inc. Announces Results of 2026 Annual Meeting of Shareholders

May 20, 2026

Prospectus

TYPE

HEADLINE

FILED AT

424B3

$250,000,000

May 19, 2016

424B3

$600,000,000

Apr 15, 2013

424B2

6,000,000 Shares

Nov 28, 2012

424B5

6,000,000 Shares

Nov 26, 2012

424B3

$800,000,000

Oct 16, 2012

424B3

Stock Split of Common Stock

Jul 27, 2011

Registrations

TYPE

HEADLINE

FILED AT

S-8

Registration

May 23, 2024

S-8

2,500,000

Jun 3, 2020

S-4

$250,000,000

May 9, 2016

S-4

$600,000,000

Apr 3, 2013

S-3ASR

Registration

Nov 26, 2012

S-4/A

$800,000,000

Oct 11, 2012

Proxies

TYPE

HEADLINE

FILED AT

DEFA14A

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

Apr 10, 2026

DEF 14A

Form DEF 14A - Other definitive proxy statements

Apr 10, 2026

DEFA14A

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

Apr 11, 2025

DEF 14A

Form DEF 14A - Other definitive proxy statements

Apr 11, 2025

DEFA14A

Form DEFA14A - Additional definitive proxy soliciting materials and Rule 14(a)(12) material

Apr 10, 2024

DEF 14A

Form DEF 14A - Other definitive proxy statements

Apr 10, 2024

Ownerships

TYPE

HEADLINE

FILED AT

Geer Charles H. II (Reporting)

Nov 3, 2026

Polito Karyn (Reporting)

Nov 2, 2026

GERSTENBERG ERIC W (Reporting)

Aug 18, 2026

144

Form 144 - Report of proposed sale of securities

Aug 14, 2026

4/A

GERSTENBERG ERIC W (Reporting)

Aug 14, 2026

4/A

GERSTENBERG ERIC W (Reporting)

Aug 14, 2026

Other

TYPE

HEADLINE

FILED AT

EFFECT

Form EFFECT - Notice of Effectiveness

May 20, 2016

CORRESP

Form CORRESP - Correspondence

May 16, 2016

CORRESP

Form CORRESP - Correspondence

May 16, 2016

LETTER

Form UPLOAD - SEC-generated letter

May 16, 2016

LETTER

Form UPLOAD - SEC-generated letter

Jun 2, 2015

CORRESP

Form CORRESP - Correspondence

May 19, 2015

Clean Harbors, Inc. CLH · SEC Filings