CLEAN HARBORS INC

CLH · Hazardous Waste Management · 52.8M shares · -1%/yr ↓ buyback · EDGAR filings ↗

Net buyback after stock comp: $30M (gross $51M, SBC $21M)

Reference price $286.19 · est. market cap ~$15.1B — last insider sale, 2026-05-26 (estimated from the dated SEC Form 4 price × shares outstanding — not a live quote)

Grade

B74

Leading hazardous-waste operator with above-average returns, strong free cash flow and a permit-protected moat.

Strengths

ROE 14.2% (72nd pct), ROA 5.1% (78th pct) and operating margin 11.2% (71st pct)
$442M free cash flow (83rd pct) with a 7.3% FCF margin and ample liquidity (current ratio 2.3)

Risks

Debt/equity ~1.0 (77th pct) from acquisition-led growth
Slow revenue growth (2.4%, 37th pct) and flat earnings this year

Notable findings

Exec changeRecent 8-K item 5.02 8-K ↗
Insider buyingInsider buying — 1 open-market buy(s) by 1 insider(s) (~$135,760, last 6mo) Form 4 ↗
Insider sellingInsider selling — 10 open-market sale(s) by 8 insider(s) (cluster of 8 insiders, ~$62M, last 6mo) Form 4 ↗

Quarterly revenue

2025-06-30 · $1.5B2025-09-30 · $1.5B2025-12-31 · $1.5B2026-03-31 · $1.5B

Last 4 quarters · from SEC filings.

Key metrics

Gross margin

31.3%

Operating margin

11.2%

Net margin

6.5%

Return on equity

14.2%

Return on assets

5.1%

ROIC

9.7%

Revenue growth (QoQ)

-2.7%

Net-income growth

-2.8%

Debt / equity

1.0×

Current ratio

2.3×

Free cash flow

$442M

EBITDA

$1.1B

Tangible book value

$614M

Stock comp / revenue

0.5%

Insider transactions · last 18 months

Date	Insider	Type	Shares	Price
2026-06-01	Diderich Jeroen	Tax withheld	1.7K	$281.00
2026-05-26	States Lauren	Sell	789	$286.19
2026-05-20	GALANTE EDWARD G	Grant	652	—
2026-05-20	Welch John R.	Grant	652	—
2026-05-20	PRESTON JOHN T	Grant	652	—
2026-05-20	States Lauren	Grant	652	—
2026-05-20	Willett Robert	Grant	652	—
2026-05-20	Robertson Andrea	Grant	652	—
2026-05-20	Reed Marcy L.	Grant	652	—
2026-05-20	Polito Karyn	Grant	652	—
2026-05-20	Stewart Shelley JR	Grant	652	—
2026-05-20	Quirk Alison A.	Grant	652	—
2026-05-11	Polito Karyn	Buy	460	$295.13
2026-05-11	Polito Karyn	Grant	460	$295.13
2026-05-11	Robertson Andrea	Gift	342	—
2026-03-18	GERSTENBERG ERIC W	Sell	1.0K	$293.00
2026-03-18	Reed Marcy L.	Sell	836	$287.94
2026-03-17	Weber Brian P	Sell	4.7K	$293.39
2026-03-13	CURTIS GEORGE L	Disposition	1.0K	—
2026-03-13	Geer Charles H. II	Disposition	139	—
2026-03-13	Underwood Rebecca	Tax withheld	125	$288.93
2026-03-13	Underwood Rebecca	Disposition	1.4K	—
2026-03-13	Harrison Robert W.	Tax withheld	18	$288.93
2026-03-13	Harrison Robert W.	Disposition	368	—
2026-03-13	Gabriel Sharon M.	Tax withheld	727	$288.93
2026-03-13	Gabriel Sharon M.	Disposition	1.4K	—
2026-03-13	Dugas Eric J.	Tax withheld	630	$288.93
2026-03-13	Dugas Eric J.	Disposition	1.3K	—
2026-03-13	Battles Michael Louis	Tax withheld	1.1K	$288.93
2026-03-13	Battles Michael Louis	Disposition	2.2K	—
2026-03-13	Weber Brian P	Tax withheld	960	$288.93
2026-03-13	Weber Brian P	Disposition	1.9K	—
2026-03-13	CURTIS GEORGE L	Tax withheld	350	$288.93
2026-03-13	GERSTENBERG ERIC W	Tax withheld	977	$288.93
2026-03-13	GERSTENBERG ERIC W	Disposition	2.2K	—
2026-03-13	MCKIM ALAN S	Tax withheld	1.3K	$288.93
2026-03-04	MCKIM ALAN S	Sell	100K	$292.65
2026-02-23	GERSTENBERG ERIC W	Sell	2.5K	$279.86
2026-02-20	Gabriel Sharon M.	Sell	3.5K	$282.07
2026-02-20	Dugas Eric J.	Sell	2.8K	$281.31
2026-02-19	Welch John R.	Sell	750	$273.07
2026-02-19	MCKIM ALAN S	Sell	100K	$281.14
2026-02-19	MCKIM ALAN S	Gift	10K	—
2026-02-02	Underwood Rebecca	Tax withheld	425	$259.91
2026-02-02	Dugas Eric J.	Tax withheld	567	$259.91
2026-02-02	Gabriel Sharon M.	Tax withheld	508	$259.91
2026-02-02	Harrison Robert W.	Tax withheld	184	$259.91
2026-02-02	Geer Charles H. II	Tax withheld	197	$259.91
2026-02-02	GERSTENBERG ERIC W	Tax withheld	4.9K	$259.91
2026-02-02	CURTIS GEORGE L	Tax withheld	249	$259.91
2026-02-02	Diderich Jeroen	Tax withheld	105	$259.91
2026-02-02	Weber Brian P	Tax withheld	1.4K	$259.91
2026-02-02	Battles Michael Louis	Tax withheld	5.2K	$259.91
2026-02-01	Dugas Eric J.	Grant	1.0K	—
2026-02-01	Geer Charles H. II	Grant	1.8K	—
2026-02-01	Geer Charles H. II	Grant	503	—
2026-02-01	Diderich Jeroen	Grant	3.1K	—
2026-02-01	Diderich Jeroen	Grant	1.0K	—
2026-02-01	Underwood Rebecca	Grant	2.5K	—
2026-02-01	Underwood Rebecca	Grant	838	—
2026-02-01	Harrison Robert W.	Grant	1.0K	—
2026-02-01	Harrison Robert W.	Grant	430	—
2026-02-01	Gabriel Sharon M.	Grant	2.1K	—
2026-02-01	Gabriel Sharon M.	Grant	566	—
2026-02-01	Dugas Eric J.	Grant	3.1K	—
2026-02-01	Battles Michael Louis	Grant	10K	—
2026-02-01	Battles Michael Louis	Grant	11K	—
2026-02-01	Weber Brian P	Grant	3.2K	—
2026-02-01	Weber Brian P	Grant	1.1K	—
2026-02-01	GERSTENBERG ERIC W	Grant	10K	—
2026-02-01	GERSTENBERG ERIC W	Grant	11K	—
2026-01-02	Gabriel Sharon M.	Tax withheld	525	$234.48
2025-12-17	Welch John R.	Gift	415	—
2025-12-16	GERSTENBERG ERIC W	Sell	601	$240.90
2025-12-15	Geer Charles H. II	Tax withheld	28	$240.71
2025-12-15	Underwood Rebecca	Tax withheld	51	$240.71
2025-12-15	Harrison Robert W.	Tax withheld	16	$240.71
2025-12-09	CURTIS GEORGE L	Gift	1.0K	—
2025-12-01	Harrison Robert W.	Tax withheld	122	$228.54
2025-11-13	States Lauren	Gift	245	—
2025-11-01	Geer Charles H. II	Tax withheld	294	$210.51
2025-09-16	MCKIM ALAN S	Gift	8.6K	—
2025-09-16	MCKIM ALAN S	Gift	4.3K	—
2025-08-05	Robertson Andrea	Gift	430	—
2025-08-01	Battles Michael Louis	Buy	2.0K	$233.50
2025-07-31	Robertson Andrea	Sell	836	$233.64
2025-07-01	Battles Michael Louis	Tax withheld	1.5K	$229.55
2025-07-01	GERSTENBERG ERIC W	Tax withheld	564	$229.55
2025-07-01	CURTIS GEORGE L	Tax withheld	399	$229.55
2025-07-01	Weber Brian P	Tax withheld	1.1K	$229.55
2025-07-01	Dugas Eric J.	Tax withheld	613	$229.55
2025-07-01	MCKIM ALAN S	Tax withheld	1.3K	$229.55
2025-07-01	Gabriel Sharon M.	Tax withheld	525	$229.55
2025-07-01	Underwood Rebecca	Tax withheld	1.1K	$229.55
2025-06-13	Weber Brian P	Sell	3.0K	$227.17
2025-06-06	GERSTENBERG ERIC W	Sell	8.1K	$225.23
2025-06-05	Quirk Alison A.	Sell	893	$223.69
2025-06-05	MCKIM ALAN S	Sell	58K	$223.80
2025-06-04	MCKIM ALAN S	Sell	42K	$225.40
2025-06-02	Diderich Jeroen	Tax withheld	1.5K	$226.79
2025-06-02	Dugas Eric J.	Tax withheld	806	$226.79
2025-05-28	Welch John R.	Sell	1.2K	$228.51
2025-05-27	States Lauren	Gift	130	—
2025-05-27	Speights Robert	Sell	1.0K	$228.49
2025-05-22	States Lauren	Sell	836	$226.17
2025-05-21	Reed Marcy L.	Grant	789	—
2025-05-21	Welch John R.	Grant	789	—
2025-05-21	Quirk Alison A.	Grant	789	—
2025-05-21	Willett Robert	Grant	789	—
2025-05-21	Robertson Andrea	Grant	789	—
2025-05-21	States Lauren	Grant	789	—
2025-05-21	Polito Karyn	Grant	789	—
2025-05-21	GALANTE EDWARD G	Grant	789	—
2025-05-21	Stewart Shelley JR	Grant	789	—
2025-05-21	PRESTON JOHN T	Grant	789	—
2025-05-02	Speights Robert	Disposition	17K	—
2025-04-01	CURTIS GEORGE L	Grant	2.0K	—
2025-03-17	Harrison Robert W.	Tax withheld	35	$192.90
2025-03-17	Dugas Eric J.	Tax withheld	631	$192.90
2025-03-17	Battles Michael Louis	Tax withheld	1.1K	$192.90
2025-03-17	Weber Brian P	Tax withheld	959	$192.90
2025-03-17	GERSTENBERG ERIC W	Tax withheld	978	$192.90
2025-03-17	MCKIM ALAN S	Tax withheld	1.3K	$192.90
2025-03-17	Speights Robert	Tax withheld	2.5K	$192.90
2025-03-17	CURTIS GEORGE L	Tax withheld	351	$192.90
2025-03-17	Weber Brian P	Tax withheld	959	$192.90
2025-03-17	Weber Brian P	Disposition	4.1K	—
2025-03-17	Dugas Eric J.	Tax withheld	631	$192.90
2025-03-17	Dugas Eric J.	Disposition	2.9K	—
2025-03-17	Speights Robert	Tax withheld	2.5K	$192.90
2025-03-17	Speights Robert	Disposition	3.6K	—
2025-03-17	GERSTENBERG ERIC W	Tax withheld	978	$192.90
2025-03-17	GERSTENBERG ERIC W	Disposition	4.7K	—
2025-03-17	Gabriel Sharon M.	Tax withheld	667	$192.90
2025-03-17	Gabriel Sharon M.	Disposition	2.8K	—
2025-03-17	Battles Michael Louis	Tax withheld	1.1K	$192.90
2025-03-17	Battles Michael Louis	Disposition	4.7K	—
2025-03-17	CURTIS GEORGE L	Tax withheld	351	$192.90
2025-03-17	CURTIS GEORGE L	Disposition	2.3K	—
2025-03-17	Underwood Rebecca	Tax withheld	176	$192.90
2025-03-17	Gabriel Sharon M.	Tax withheld	667	$192.90
2025-03-10	Speights Robert	Sell	2.7K	$190.44
2025-03-10	Dugas Eric J.	Buy	1.1K	$191.38
2025-03-03	MCKIM ALAN S	Gift	28K	—
2025-03-03	MCKIM ALAN S	Sell	3.0K	$212.02
2025-03-03	MCKIM ALAN S	Sell	50K	$210.18
2025-02-18	States Lauren	Sell	308	$228.79
2025-02-01	GERSTENBERG ERIC W	Grant	11K	—
2025-02-01	Battles Michael Louis	Grant	11K	—
2025-02-01	Battles Michael Louis	Grant	5.3K	—
2025-02-01	Battles Michael Louis	Tax withheld	4.4K	$233.00
2025-02-01	Weber Brian P	Grant	1.1K	—
2025-02-01	Weber Brian P	Grant	3.3K	—
2025-02-01	Weber Brian P	Tax withheld	1.1K	$233.00
2025-02-01	Gabriel Sharon M.	Grant	583	—
2025-02-01	Gabriel Sharon M.	Grant	2.1K	—
2025-02-01	Gabriel Sharon M.	Tax withheld	339	$233.00
2025-02-01	GERSTENBERG ERIC W	Grant	11K	—
2025-02-01	GERSTENBERG ERIC W	Grant	5.3K	—
2025-02-01	GERSTENBERG ERIC W	Tax withheld	6.6K	$233.00
2025-02-01	CURTIS GEORGE L	Tax withheld	181	$233.00
2025-02-01	Speights Robert	Grant	975	—
2025-02-01	Speights Robert	Grant	2.9K	—
2025-02-01	Speights Robert	Disposition	326	$233.00
2025-02-01	Dugas Eric J.	Grant	975	—
2025-02-01	Dugas Eric J.	Grant	2.9K	—
2025-02-01	Dugas Eric J.	Tax withheld	292	$233.00
2025-02-01	Battles Michael Louis	Grant	11K	—
2025-02-01	Battles Michael Louis	Grant	5.3K	—
2025-02-01	Battles Michael Louis	Tax withheld	5.2K	$233.00
2025-02-01	Battles Michael Louis	Grant	11K	—
2025-02-01	Battles Michael Louis	Grant	5.3K	—
2025-02-01	Battles Michael Louis	Tax withheld	5.2K	$233.00
2025-02-01	GERSTENBERG ERIC W	Grant	5.3K	—
2025-02-01	GERSTENBERG ERIC W	Tax withheld	7.4K	$233.00
2025-02-01	Underwood Rebecca	Grant	863	—
2025-02-01	Underwood Rebecca	Grant	2.6K	—
2025-02-01	Underwood Rebecca	Tax withheld	299	$233.00
2025-02-01	Gabriel Sharon M.	Grant	583	—
2025-02-01	Gabriel Sharon M.	Grant	2.1K	—
2025-02-01	Gabriel Sharon M.	Tax withheld	777	$233.00
2025-02-01	Speights Robert	Grant	975	—
2025-02-01	Speights Robert	Grant	2.9K	—
2025-02-01	Speights Robert	Tax withheld	776	$233.00
2025-02-01	Diderich Jeroen	Grant	1.1K	—
2025-02-01	Diderich Jeroen	Grant	3.2K	—
2025-02-01	Dugas Eric J.	Grant	975	—
2025-02-01	Dugas Eric J.	Grant	2.9K	—
2025-02-01	Dugas Eric J.	Tax withheld	816	$233.00
2025-02-01	CURTIS GEORGE L	Tax withheld	452	$233.00
2025-02-01	Harrison Robert W.	Grant	443	—
2025-02-01	Harrison Robert W.	Grant	1.0K	—
2025-02-01	Weber Brian P	Grant	1.1K	—
2025-02-01	Weber Brian P	Grant	3.3K	—
2025-02-01	Weber Brian P	Tax withheld	1.8K	$233.00
2025-01-15	States Lauren	Sell	308	$239.04
2025-01-01	Gabriel Sharon M.	Tax withheld	484	$230.14

All non-derivative Form 4 activity (SEC), newest first.

Notable events (8-K)

Date	Items
2026-05-20	Exec/director changeReg FDExhibits	filing ↗
2026-05-20	Shareholder voteExhibits	filing ↗
2026-05-14	OtherExhibits	filing ↗
2026-05-06	ResultsExhibits	filing ↗
2026-02-18	ResultsExhibits	filing ↗
2025-10-29	ResultsExhibits	filing ↗
2025-10-10	Material agreementDebt obligationExhibits	filing ↗
2025-09-26	OtherExhibits	filing ↗

Recent filings

Form	Filed	Period	Accession
8-K	2026-05-20	2026-05-19	0000822818-26-000027 ↗
8-K	2026-05-20	2026-05-20	0000822818-26-000028 ↗
8-K	2026-05-14	2026-05-14	0000822818-26-000024 ↗
10-Q	2026-05-06	2026-03-31	0000822818-26-000020 ↗
8-K	2026-05-06	2026-05-06	0000822818-26-000017 ↗
8-K	2026-02-18	2026-02-18	0000822818-26-000004 ↗
10-K	2026-02-18	2025-12-31	0000822818-26-000009 ↗
10-Q	2025-10-29	2025-09-30	0000822818-25-000040 ↗
8-K	2025-10-29	2025-10-29	0000822818-25-000038 ↗
8-K	2025-10-10	2025-10-09	0000822818-25-000036 ↗
8-K	2025-09-26	2025-09-25	0000822818-25-000034 ↗
10-Q	2025-07-30	2025-06-30	0000822818-25-000030 ↗