CLH insider transactions

EVP&President of Sales&Service Diderich Jeroen covered exercise/tax liability with 1,717 shares, decreasing direct ownership by 10% to 16,152 units (SEC Form 4)

Director States Lauren sold $225,804 worth of shares (789 units at $286.19), decreasing direct ownership by 6% to 11,359 units (SEC Form 4)

Director Willett Robert was granted 652 shares, increasing direct ownership by 7% to 10,028 units (SEC Form 4)

Director Welch John R. was granted 652 shares, increasing direct ownership by 6% to 10,889 units (SEC Form 4)

Director Stewart Shelley Jr was granted 652 shares, increasing direct ownership by 17% to 4,523 units (SEC Form 4)

Director States Lauren was granted 652 shares, increasing direct ownership by 6% to 12,148 units (SEC Form 4)

Director Robertson Andrea was granted 652 shares, increasing direct ownership by 7% to 9,768 units (SEC Form 4)

Director Reed Marcy L. was granted 652 shares, increasing direct ownership by 13% to 5,733 units (SEC Form 4)

Director Quirk Alison A. was granted 652 shares, increasing direct ownership by 22% to 3,630 units (SEC Form 4)

Director Preston John T was granted 652 shares, increasing direct ownership by 10% to 7,044 units (SEC Form 4)

Director Galante Edward G was granted 652 shares, increasing direct ownership by 3% to 25,461 units (SEC Form 4)

Director Polito Karyn was granted 652 shares, increasing direct ownership by 19% to 4,127 units (SEC Form 4)

Amendment: Director Polito Karyn bought $135,760 worth of shares (460 units at $295.13), increasing direct ownership by 15% to 3,475 units (SEC Form 4)

Director Polito Karyn was granted 460 shares, increasing direct ownership by 15% to 3,475 units (SEC Form 4)

Director Robertson Andrea gifted 342 shares, decreasing direct ownership by 4% to 9,116 units (SEC Form 4)

SEC Form 4 filed by Gerstenberg Eric W

SEC Form 4 filed by Reed Marcy L.

EVP (CHESI) Weber Brian P covered exercise/tax liability with 960 shares, returned 1,869 shares to the company and sold $1,373,945 worth of shares (4,683 units at $293.39), decreasing direct ownership by 13% to 48,728 units (SEC Form 4)

PRESIDENT & EVP FACILITIES Underwood Rebecca covered exercise/tax liability with 125 shares and returned 1,401 shares to the company, decreasing direct ownership by 8% to 18,684 units (SEC Form 4)

EVP/CIO (CHESI) Gabriel Sharon M. covered exercise/tax liability with 727 shares and returned 1,401 shares to the company, decreasing direct ownership by 9% to 21,065 units (SEC Form 4)

CO-CEO Gerstenberg Eric W covered exercise/tax liability with 977 shares and returned 2,166 shares to the company, decreasing direct ownership by 7% to 39,877 units (SEC Form 4)

EVP, EHS Harrison Robert W. covered exercise/tax liability with 18 shares and returned 368 shares to the company, decreasing direct ownership by 5% to 6,648 units (SEC Form 4)

EVP, Industrial Services Geer Charles H. Ii returned 139 shares to the company, decreasing direct ownership by 1% to 10,839 units (SEC Form 4)

EVP CHIEF FINANCIAL OFFICER Dugas Eric J. covered exercise/tax liability with 630 shares and returned 1,324 shares to the company, decreasing direct ownership by 12% to 13,979 units (SEC Form 4)

EXEC. VICE PRESIDENT (CHESI) Curtis George L covered exercise/tax liability with 350 shares and returned 1,028 shares to the company, decreasing direct ownership by 3% to 46,048 units (SEC Form 4)

EXEC CHAIR, CTO. Mckim Alan S covered exercise/tax liability with 1,265 shares, decreasing direct ownership by 4% to 32,762 units (SEC Form 4)

CO-CEO Battles Michael Louis returned 2,166 shares to the company and covered exercise/tax liability with 1,148 shares, decreasing direct ownership by 3% to 95,387 units (SEC Form 4)

EXEC CHAIR, CTO. Mckim Alan S sold $29,265,000 worth of shares (100,000 units at $292.65) (SEC Form 4)

CO-CEO Gerstenberg Eric W sold $699,650 worth of shares (2,500 units at $279.86), decreasing direct ownership by 5% to 43,020 units (SEC Form 4)

EXEC CHAIR, CTO. Mckim Alan S sold $28,114,000 worth of shares (100,000 units at $281.14) and gifted 10,000 shares (SEC Form 4)

EVP/CIO (CHESI) Gabriel Sharon M. sold $998,528 worth of shares (3,540 units at $282.07), decreasing direct ownership by 13% to 23,193 units (SEC Form 4)

EVP CHIEF FINANCIAL OFFICER Dugas Eric J. sold $784,292 worth of shares (2,788 units at $281.31), decreasing direct ownership by 15% to 15,933 units (SEC Form 4)

Director Welch John R. sold $204,802 worth of shares (750 units at $273.07), decreasing direct ownership by 7% to 10,237 units (SEC Form 4)

CO-CEO Battles Michael Louis was granted 20,980 shares and covered exercise/tax liability with 5,205 shares, increasing direct ownership by 19% to 98,686 units (SEC Form 4)

EVP (CHESI) Weber Brian P covered exercise/tax liability with 1,394 shares and was granted 4,222 shares, increasing direct ownership by 5% to 56,240 units (SEC Form 4)

PRESIDENT & EVP FACILITIES Underwood Rebecca was granted 3,351 shares and covered exercise/tax liability with 425 shares, increasing direct ownership by 17% to 20,210 units (SEC Form 4)

EVP, EHS Harrison Robert W. was granted 1,433 shares and covered exercise/tax liability with 184 shares, increasing direct ownership by 22% to 7,034 units (SEC Form 4)

CO-CEO Gerstenberg Eric W covered exercise/tax liability with 4,934 shares and was granted 20,980 shares, increasing direct ownership by 32% to 66,500 units (SEC Form 4)

EVP, Industrial Services Geer Charles H. Ii covered exercise/tax liability with 197 shares and was granted 2,346 shares, increasing direct ownership by 24% to 10,963 units (SEC Form 4)

EVP/CIO (CHESI) Gabriel Sharon M. was granted 2,639 shares and covered exercise/tax liability with 508 shares, increasing direct ownership by 8% to 29,372 units (SEC Form 4)

EVP CHIEF FINANCIAL OFFICER Dugas Eric J. covered exercise/tax liability with 567 shares and was granted 4,088 shares, increasing direct ownership by 18% to 22,809 units (SEC Form 4)

EVP&President of Sales&Service Diderich Jeroen covered exercise/tax liability with 105 shares and was granted 4,188 shares, increasing direct ownership by 30% to 17,855 units (SEC Form 4)

EXEC. VICE PRESIDENT (CHESI) Curtis George L covered exercise/tax liability with 249 shares, decreasing direct ownership by 0.52% to 47,415 units (SEC Form 4)

EVP/CIO (CHESI) Gabriel Sharon M. covered exercise/tax liability with 525 shares, decreasing direct ownership by 2% to 27,241 units (SEC Form 4)

Director Welch John R. gifted 415 shares, decreasing direct ownership by 4% to 10,987 units (SEC Form 4)

PRESIDENT & EVP FACILITIES Underwood Rebecca covered exercise/tax liability with 51 shares, decreasing direct ownership by 0.29% to 17,284 units (SEC Form 4)

EVP, EHS Harrison Robert W. covered exercise/tax liability with 16 shares, decreasing direct ownership by 0.28% to 5,785 units (SEC Form 4)

EVP, Industrial Services Geer Charles H. Ii covered exercise/tax liability with 28 shares, decreasing direct ownership by 0.32% to 8,814 units (SEC Form 4)

CO-CEO Gerstenberg Eric W sold $144,781 worth of shares (601 units at $240.90), decreasing direct ownership by 1% to 50,454 units (SEC Form 4)

EXEC. VICE PRESIDENT (CHESI) Curtis George L gifted 1,000 shares, decreasing direct ownership by 2% to 47,664 units (SEC Form 4)

SEC Form 4 filed by Clean Harbors Inc.

Director States Lauren gifted 245 shares, decreasing direct ownership by 2% to 11,496 units (SEC Form 4)

EVP, Industrial Services Geer Charles H. Ii covered exercise/tax liability with 294 shares, decreasing direct ownership by 3% to 8,842 units (SEC Form 4)

EXEC CHAIR, CTO. Mckim Alan S gifted 12,850 shares (SEC Form 4)

Director Robertson Andrea gifted 430 shares, decreasing direct ownership by 4% to 9,458 units (SEC Form 4)

Director Robertson Andrea sold $195,323 worth of shares (836 units at $233.64), decreasing direct ownership by 8% to 9,888 units (SEC Form 4)

CO-CEO Battles Michael Louis bought $467,000 worth of shares (2,000 units at $233.50), increasing direct ownership by 2% to 82,911 units (SEC Form 4)

New insider Geer Charles H. Ii claimed ownership of 9,136 shares (SEC Form 3)

PRESIDENT & EVP FACILITIES Underwood Rebecca covered exercise/tax liability with 1,051 shares, decreasing direct ownership by 6% to 17,335 units (SEC Form 4)

CO-CEO Battles Michael Louis covered exercise/tax liability with 1,532 shares, decreasing direct ownership by 2% to 80,911 units (SEC Form 4)