What SEC filings does Clean Harbors, Inc. submit to the SEC?

Clean Harbors, Inc. (CLH) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about CLH?

A Form 4 for CLH discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from Clean Harbors, Inc.?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for CLH?

The 10-K is Clean Harbors, Inc.'s annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all CLH SEC filings directly on EDGAR?

You can view all historical Clean Harbors, Inc. filings on the SEC EDGAR company page for CLH. Each filing card on this page links directly to the original SEC document.

How often does Clean Harbors, Inc. file with the SEC?

Clean Harbors, Inc. files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling CLH shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

CLH SEC Filing News — Clean Harbors, Inc.

Latest SEC filings for Clean Harbors, Inc. (CLH) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-10-05.

Clean Harbors, Inc. provides environmental and industrial services in the United States and Canada. The company operates through two segments: Environmental Services and Safety-Kleen Sustainability Solutions. The Environmental Services segment collects, transports, treats, recycles, and disposes hazardous and non-hazardous waste, such as resource recovery, physical treatment, incineration, landfill disposal, wastewater treatment, lab chemicals disposal, and explosives management services; and of…

Sector: Industrials Industry: Waste Management Market Cap: $16.6B

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for CLH currently lean bearish. Of the 20 filing records displayed, 2 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.

CLH Filing Activity Snapshot 2026-06-03 — 2026-10-05

Insider Transactions (Form 4)

0 buys vs 2 sells

Net insider selling in this period — insiders sell for many reasons beyond conviction.

Largest Form 144 Filing

$805.0K

GERSTENBERG ERIC W · 2026-08-14

2,500 shares · Form 144

Form 144 Notices

Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.

Insider Transactions 13 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 13 filings in this group are Form 4s for Clean Harbors, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 13 insider filings shown, the breakdown is 11 tax withholding and 2 open-market sale. 2 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Tax withholding ×11: Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.
Open-market sale ×2: The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Form 4 Open-market sale Insider Selling 2026-08-18

CLH insider GERSTENBERG ERIC W (CO-CEO) sold 2,500 shares (~$803.3K)

GERSTENBERG ERIC W, listed as CO-CEO at CLEAN HARBORS INC, reported an open-market sale of 2,500 CLH shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	2,500	$321.34	$803.3K

Filing: Form 4 (Insider Transaction) Insider: GERSTENBERG ERIC W (CO-CEO) Shares: 2,500 Est. Value: $803.3K

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-08-12

CLH insider Form 4 filed for equity award, exercise, or tax withholding

Battles Michael Louis (Director, CO-CEO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	1,032	$290.74	$300.0K

Filing: Form 4 (Insider Transaction) Insider: Battles Michael Louis (Director, CO-CEO) Shares: 1,032

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-08-11

CLH insider Form 4 filed for equity award, exercise, or tax withholding

CURTIS GEORGE L (EXEC. VICE PRESIDENT (CHESI)) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	1,757	$290.74	$510.8K

Filing: Form 4 (Insider Transaction) Insider: CURTIS GEORGE L (EXEC. VICE PRESIDENT (CHESI)) Shares: 1,757

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-08-03

CLH insider Robertson Andrea (Director) sold 789 shares (~$247.8K)

Robertson Andrea, listed as Director at CLEAN HARBORS INC, reported an open-market sale of 789 CLH shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	789	$314.01	$247.8K

Filing: Form 4 (Insider Transaction) Insider: Robertson Andrea (Director) Shares: 789 Est. Value: $247.8K

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-07-20

CLH insider Form 4 filed for equity award, exercise, or tax withholding

MCKIM ALAN S (Director, EXEC CHAIR, CTO.) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	1,265	$310.58	$392.9K

Filing: Form 4 (Insider Transaction) Insider: MCKIM ALAN S (Director, EXEC CHAIR, CTO.) Shares: 1,265

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-07-06

CLH insider Form 4 filed for equity award, exercise, or tax withholding

Gabriel Sharon M. (EVP/CIO (CHESI)) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	359	$290.74	$104.4K

Filing: Form 4 (Insider Transaction) Insider: Gabriel Sharon M. (EVP/CIO (CHESI)) Shares: 359

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-07-06

CLH insider Form 4 filed for equity award, exercise, or tax withholding

Weber Brian P (EVP (CHESI)) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	814	$290.74	$236.7K

Filing: Form 4 (Insider Transaction) Insider: Weber Brian P (EVP (CHESI)) Shares: 814

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-07-06

CLH insider Form 4 filed for equity award, exercise, or tax withholding

Underwood Rebecca (PRESIDENT & EVP FACILITIES) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	311	$290.74	$90.4K

Filing: Form 4 (Insider Transaction) Insider: Underwood Rebecca (PRESIDENT & EVP FACILITIES) Shares: 311

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-07-06

CLH insider Form 4 filed for equity award, exercise, or tax withholding

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	1,343	$290.74	$390.5K

Filing: Form 4 (Insider Transaction) Insider: MCKIM ALAN S (Director, EXEC CHAIR, CTO.) Shares: 1,343

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-07-06

CLH insider Form 4 filed for equity award, exercise, or tax withholding

GERSTENBERG ERIC W (CO-CEO) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	564	$290.74	$164.0K

Filing: Form 4 (Insider Transaction) Insider: GERSTENBERG ERIC W (CO-CEO) Shares: 564

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-07-06

CLH insider Form 4 filed for equity award, exercise, or tax withholding

Geer Charles H. II (EVP, Industrial Services) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	40	$290.74	$11.6K

Filing: Form 4 (Insider Transaction) Insider: Geer Charles H. II (EVP, Industrial Services) Shares: 40

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-07-06

CLH insider Form 4 filed for equity award, exercise, or tax withholding

Dugas Eric J. (EVP CHIEF FINANCIAL OFFICER) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	447	$290.74	$130.0K

Filing: Form 4 (Insider Transaction) Insider: Dugas Eric J. (EVP CHIEF FINANCIAL OFFICER) Shares: 447

View on SEC EDGAR → Open Filing Document →

Form 4 Tax withholding Tax / Compensation Filing 2026-06-03

CLH insider Form 4 filed for equity award, exercise, or tax withholding

Diderich Jeroen (EVP&President of Sales&Service) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were withheld by the company to settle tax due when equity vested. This is an automatic administrative step and not a decision to sell.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`F`	Tax withholding on vested shares	1,717	$281.00	$482.5K

Filing: Form 4 (Insider Transaction) Insider: Diderich Jeroen (EVP&President of Sales&Service) Shares: 1,717

View on SEC EDGAR → Open Filing Document →

Proposed Insider Sales 2 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Clean Harbors, Inc. has 2 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-08-14

CLH Form 144 filed for proposed insider sale by GERSTENBERG ERIC W (2,500 shares) ~$805.0K

GERSTENBERG ERIC W filed a Form 144 with the SEC indicating intent to sell CLH (CLEAN HARBORS INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: GERSTENBERG ERIC W Shares: 2,500 Est. Value: $805.0K

View on SEC EDGAR → Open Filing Document →

Form 144 Proposed Insider Sale 2026-08-03

CLH Form 144 filed for proposed insider sale by ANDREA ROBERTSON (789 shares) ~$247.8K

ANDREA ROBERTSON filed a Form 144 with the SEC indicating intent to sell CLH (CLEAN HARBORS INC) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: ANDREA ROBERTSON Shares: 789 Est. Value: $247.8K

View on SEC EDGAR → Open Filing Document →

Material Events 4 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 4 in this period for Clean Harbors, Inc. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-10-05

CLH filed 8-K — material company event

CLEAN HARBORS INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-09-18

CLH filed 8-K — material company event

CLEAN HARBORS INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-08-12

CLH filed 8-K — material company event

CLEAN HARBORS INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-07-29

CLH filed 8-K — material company event

CLEAN HARBORS INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Periodic Reports 1 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 quarterly report (10-Q) for Clean Harbors, Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-07-29

CLH filed Quarterly Report (10-Q)

CLEAN HARBORS INC filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

How we classify Clean Harbors, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on CLH. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — CLH SEC Filings

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CLH Full Analysis

Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.

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