George L Curtis

Insider

First SEC filing: Feb. 12, 2015 · Latest: Feb. 12, 2015

On this page

Insider at Companies where this person is a reporting insider.
Insider transactions Every share this person bought or sold, from Form 4 filings.
Derivatives Options and other derivative holdings reported by this person.

Insider at

CLH selling Aug. 23, 2023

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 93 non-open-market transactions below last 12 months, based on the transactions shown below

Price change vs current quote, split-adjusted for corporate actions since the filing — not benchmarked, not annualized, not size-weighted

93 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
July 1, 2026	CLH	F	1,757	$290.74	$510,830	44,291 Direct	-3.82%	Disposed	9.4% (price as of 2026-08-21)
March 13, 2026	CLH	D	1,028	—	—	46,048 Direct	-2.18%	Disposed	(price as of 2026-08-21)
March 13, 2026	CLH	F	350	$288.93	$101,126	47,065 Direct	-0.74%	Disposed	10.1% (price as of 2026-08-21)
Feb. 2, 2026	CLH	F	249	$259.91	$64,718	47,415 Direct	-0.52%	Disposed	22.4% (price as of 2026-08-21)
Dec. 9, 2025	CLH	G	1,000	—	—	47,664 Direct	-2.05%	Disposed	(price as of 2026-08-21)
July 1, 2024	CLH	F	606	$220.63	$133,702	49,826 Direct	-1.20%	Disposed	44.2% (price as of 2026-08-21)
March 15, 2024	CLH	F	221	$187.84	$41,513	50,432 Direct	-0.44%	Disposed	69.4% (price as of 2026-08-21)
Feb. 1, 2024	CLH	A	561	—	—	48,597 Direct	+1.17%	Acquired	(price as of 2026-08-21)
Feb. 1, 2024	CLH	A	2,056	—	—	50,653 Direct	+4.23%	Acquired	(price as of 2026-08-21)
Dec. 15, 2023	CLH	F	66	$174.75	$11,534	48,036 Direct	-0.14%	Disposed	82.1% (price as of 2026-08-21)
Aug. 23, 2023	CLH	S	10,303	$171.54	$1,767,377	48,102 Direct	-17.64%	Disposed	85.5% (price as of 2026-08-21)
July 3, 2023	CLH	S	717	$164.43	$117,896	58,405 Direct	-1.21%	Disposed	93.5% (price as of 2026-08-21)
March 15, 2023	CLH	S	221	$133.07	$29,408	59,122 Direct	-0.37%	Disposed	139.1% (price as of 2026-08-21)
Feb. 1, 2023	CLH	A	866	—	—	56,166 Direct	+1.57%	Acquired	(price as of 2026-08-21)
Feb. 1, 2023	CLH	A	3,177	—	—	59,343 Direct	+5.66%	Acquired	(price as of 2026-08-21)
Dec. 15, 2022	CLH	F	150	$116.50	$17,475	55,300 Direct	-0.27%	Disposed	173.1% (price as of 2026-08-21)
July 1, 2022	CLH	F	661	$90.32	$59,702	55,450 Direct	-1.18%	Disposed	252.3% (price as of 2026-08-21)
March 15, 2022	CLH	F	44	$105.77	$4,654	56,111 Direct	-0.08%	Disposed	200.8% (price as of 2026-08-21)
March 10, 2022	CLH	D	458	—	—	56,155 Direct	-0.81%	Disposed	(price as of 2026-08-21)
Feb. 7, 2022	CLH	A	1,024	—	—	56,613 Direct	+1.84%	Acquired	(price as of 2026-08-21)
Feb. 7, 2022	CLH	A	3,753	—	—	55,589 Direct	+7.24%	Acquired	(price as of 2026-08-21)
Dec. 15, 2021	CLH	F	419	$98.73	$41,368	51,836 Direct	-0.80%	Disposed	222.3% (price as of 2026-08-21)
July 1, 2021	CLH	F	395	$93.23	$36,826	52,255 Direct	-0.75%	Disposed	241.3% (price as of 2026-08-21)
July 1, 2021	CLH	A	1,086	—	—	52,650 Direct	+2.11%	Acquired	(price as of 2026-08-21)
July 1, 2021	CLH	A	3,982	—	—	51,564 Direct	+8.37%	Acquired	(price as of 2026-08-21)
June 1, 2021	CLH	F	108	$94.13	$10,166	47,582 Direct	-0.23%	Disposed	238.0% (price as of 2026-08-21)
March 15, 2021	CLH	D	707	—	—	47,690 Direct	-1.46%	Disposed	(price as of 2026-08-21)
March 15, 2021	CLH	F	305	$89.50	$27,298	48,397 Direct	-0.63%	Disposed	255.5% (price as of 2026-08-21)
Dec. 15, 2020	CLH	F	186	$72.99	$13,576	48,702 Direct	-0.38%	Disposed	335.9% (price as of 2026-08-21)
July 1, 2020	CLH	A	2,287	—	—	49,162 Direct	+4.88%	Acquired	(price as of 2026-08-21)
July 1, 2020	CLH	A	1,715	—	—	46,875 Direct	+3.80%	Acquired	(price as of 2026-08-21)
July 1, 2020	CLH	F	274	$58.30	$15,974	48,888 Direct	-0.56%	Disposed	445.8% (price as of 2026-08-21)
June 1, 2020	CLH	F	202	$60.78	$12,278	45,160 Direct	-0.45%	Disposed	423.5% (price as of 2026-08-21)
April 1, 2020	CLH	F	490	$45.91	$22,496	45,362 Direct	-1.07%	Disposed	593.1% (price as of 2026-08-21)
March 15, 2020	CLH	F	113	$54.33	$6,139	45,852 Direct	-0.25%	Disposed	485.6% (price as of 2026-08-21)
Dec. 15, 2019	CLH	F	290	$83.68	$24,267	45,965 Direct	-0.63%	Disposed	280.2% (price as of 2026-08-21)
Oct. 31, 2019	CLH	S	10,408	$83.82	$872,399	46,255 Direct	-18.37%	Disposed	279.6% (price as of 2026-08-21)
July 1, 2019	CLH	A	1,326	—	—	56,663 Direct	+2.40%	Acquired	(price as of 2026-08-21)
July 1, 2019	CLH	A	1,768	—	—	55,337 Direct	+3.30%	Acquired	(price as of 2026-08-21)
June 3, 2019	CLH	F	496	$64.12	$31,804	53,569 Direct	-0.92%	Disposed	396.2% (price as of 2026-08-21)
April 1, 2019	CLH	F	981	$72.00	$70,632	54,065 Direct	-1.78%	Disposed	341.9% (price as of 2026-08-21)
March 15, 2019	CLH	F	241	$68.74	$16,566	55,046 Direct	-0.44%	Disposed	362.9% (price as of 2026-08-21)
March 13, 2019	CLH	D	1,344	—	—	55,287 Direct	-2.37%	Disposed	(price as of 2026-08-21)
Dec. 14, 2018	CLH	F	91	$55.53	$5,053	56,631 Direct	-0.16%	Disposed	473.0% (price as of 2026-08-21)
July 1, 2018	CLH	A	1,725	—	—	56,722 Direct	+3.14%	Acquired	(price as of 2026-08-21)
July 1, 2018	CLH	A	2,301	—	—	54,997 Direct	+4.37%	Acquired	(price as of 2026-08-21)
June 1, 2018	CLH	F	361	$53.69	$19,382	52,696 Direct	-0.68%	Disposed	492.6% (price as of 2026-08-21)
April 2, 2018	CLH	F	982	$48.81	$47,931	53,057 Direct	-1.82%	Disposed	551.9% (price as of 2026-08-21)
March 15, 2018	CLH	F	129	$49.98	$6,447	54,039 Direct	-0.24%	Disposed	536.6% (price as of 2026-08-21)
Feb. 28, 2018	CLH	F	1,460	—	—	54,168 Direct	-2.62%	Disposed	(price as of 2026-08-21)
Dec. 15, 2017	CLH	F	176	$52.17	$9,182	55,628 Direct	-0.32%	Disposed	509.9% (price as of 2026-08-21)
Dec. 15, 2017	CLH	F	0	—	—	0 Direct	—	Disposed	(price as of 2026-08-21)
July 1, 2017	CLH	A	1,551	—	—	55,804 Direct	+2.86%	Acquired	(price as of 2026-08-21)
July 1, 2017	CLH	A	2,068	—	—	54,253 Direct	+3.96%	Acquired	(price as of 2026-08-21)
June 1, 2017	CLH	F	261	$59.25	$15,464	52,185 Direct	-0.50%	Disposed	437.0% (price as of 2026-08-21)
April 1, 2017	CLH	A	5,000	—	—	53,073 Direct	+10.40%	Acquired	(price as of 2026-08-21)
March 31, 2017	CLH	F	541	$55.62	$30,090	52,446 Direct	-1.02%	Disposed	472.1% (price as of 2026-08-21)
March 16, 2017	CLH	F	255	$55.74	$14,214	48,073 Direct	-0.53%	Disposed	470.8% (price as of 2026-08-21)
March 8, 2017	CLH	D	1,700	—	—	48,328 Direct	-3.40%	Disposed	(price as of 2026-08-21)
Dec. 15, 2016	CLH	F	88	$57.13	$5,027	50,028 Direct	-0.18%	Disposed	456.9% (price as of 2026-08-21)
Dec. 12, 2016	CLH	S	6,016	$56.00	$336,896	50,116 Direct	-10.72%	Disposed	468.2% (price as of 2026-08-21)
June 21, 2016	CLH	F	98	$51.86	$5,082	56,132 Direct	-0.17%	Disposed	513.5% (price as of 2026-08-21)
June 7, 2016	CLH	A	2,440	—	—	56,230 Direct	+4.54%	Acquired	(price as of 2026-08-21)
June 7, 2016	CLH	A	1,830	—	—	53,790 Direct	+3.52%	Acquired	(price as of 2026-08-21)
April 1, 2016	CLH	A	5,000	—	—	51,960 Direct	+10.65%	Acquired	(price as of 2026-08-21)
March 30, 2016	CLH	F	72	$49.70	$3,578	46,960 Direct	-0.15%	Disposed	540.2% (price as of 2026-08-21)
March 15, 2016	CLH	F	313	$45.77	$14,326	47,032 Direct	-0.66%	Disposed	595.2% (price as of 2026-08-21)
March 11, 2016	CLH	F	293	$45.75	$13,405	47,345 Direct	-0.62%	Disposed	595.5% (price as of 2026-08-21)
March 8, 2016	CLH	D	1,336	—	—	47,638 Direct	-2.73%	Disposed	(price as of 2026-08-21)
Dec. 15, 2015	CLH	F	39	$41.11	$1,603	48,974 Direct	-0.08%	Disposed	674.0% (price as of 2026-08-21)
June 22, 2015	CLH	F	98	$55.34	$5,423	49,013 Direct	-0.20%	Disposed	475.0% (price as of 2026-08-21)
June 9, 2015	CLH	A	2,126	—	—	49,111 Direct	+4.52%	Acquired	(price as of 2026-08-21)
June 9, 2015	CLH	A	1,595	—	—	46,985 Direct	+3.51%	Acquired	(price as of 2026-08-21)
March 30, 2015	CLH	F	215	$56.69	$12,188	45,390 Direct	-0.47%	Disposed	461.3% (price as of 2026-08-21)
March 15, 2015	CLH	F	39	$56.32	$2,196	45,605 Direct	-0.09%	Disposed	465.0% (price as of 2026-08-21)
March 10, 2015	CLH	F	271	$54.24	$14,699	45,644 Direct	-0.59%	Disposed	486.6% (price as of 2026-08-21)
March 10, 2015	CLH	D	1,441	—	—	45,915 Direct	-3.04%	Disposed	(price as of 2026-08-21)
June 20, 2014	CLH	F	293	$63.10	$18,488	47,025 Direct	-0.62%	Disposed	404.2% (price as of 2026-08-21)
June 18, 2014	CLH	A	1,781	—	—	47,318 Direct	+3.91%	Acquired	(price as of 2026-08-21)
June 18, 2014	CLH	A	1,336	—	—	45,537 Direct	+3.02%	Acquired	(price as of 2026-08-21)
March 11, 2014	CLH	F	272	$51.84	$14,100	44,201 Direct	-0.61%	Disposed	513.8% (price as of 2026-08-21)
Feb. 26, 2014	CLH	D	1,465	—	—	44,473 Direct	-3.19%	Disposed	(price as of 2026-08-21)
May 6, 2013	CLH	A	1,801	—	—	45,667 Direct	+4.11%	Acquired	(price as of 2026-08-21)
May 6, 2013	CLH	A	1,351	—	—	43,866 Direct	+3.18%	Acquired	(price as of 2026-08-21)
March 11, 2013	CLH	A	2,500	—	—	42,515 Direct	+6.25%	Acquired	(price as of 2026-08-21)
Dec. 15, 2012	CLH	F	787	$56.05	$44,111	40,015 Direct	-1.93%	Disposed	467.7% (price as of 2026-08-21)
March 30, 2012	CLH	A	1,099	—	—	40,802 Direct	+2.77%	Acquired	(price as of 2026-08-21)
March 30, 2012	CLH	A	1,465	—	—	39,703 Direct	+3.83%	Acquired	(price as of 2026-08-21)
March 15, 2012	CLH	F	318	$68.96	$21,929	38,238 Direct	-0.82%	Disposed	361.4% (price as of 2026-08-21)
Dec. 15, 2011	CLH	F	769	$58.59	$45,056	38,385 Direct	-1.96%	Disposed	443.1% (price as of 2026-08-21)
Dec. 15, 2011	CLH	F	456	$58.59	$26,717	39,154 Direct	-1.15%	Disposed	443.1% (price as of 2026-08-21)
Dec. 15, 2011	CLH	F	130	$58.59	$7,617	39,610 Direct	-0.33%	Disposed	443.1% (price as of 2026-08-21)
July 5, 2011	CLH	S	5,000	$105.02	$525,100	19,870 Direct	-20.10%	Disposed	505.9% (price as of 2026-08-21)
June 20, 2011	CLH	A	750	—	—	24,870 Direct	+3.11%	Acquired	(price as of 2026-08-21)
June 20, 2011	CLH	A	1,000	—	—	24,120 Direct	+4.33%	Acquired	(price as of 2026-08-21)
March 15, 2011	CLH	F	613	$95.29	$58,413	23,120 Direct	-2.58%	Disposed	567.8% (price as of 2026-08-21)
Dec. 15, 2010	CLH	F	65	$78.38	$5,095	23,621 Direct	-0.27%	Disposed	711.9% (price as of 2026-08-21)
May 7, 2010	CLH	M	5,000	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-21)
May 7, 2010	CLH	S	5,000	$60.24	$301,200	23,686 Direct	-17.43%	Disposed	956.4% (price as of 2026-08-21)
May 7, 2010	CLH	M	5,000	$12.98	$64,900	28,636 Direct	+21.15%	Acquired	4802.6% (price as of 2026-08-21)

Showing latest 100 of 129 transactions

P = Open-market purchase · S = Sale · A = Grant/award · M = Option exercise · G = Gift · F = Tax withholding

Insider transactions are not a recommendation; sales are often driven by liquidity or tax reasons.

Derivative holdings (Form 4 Table II)

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
May 7, 2010	CLH	Stock Option	Common Stock (5,000)	$12.98	Feb. 21, 2013	5,000	Disposed
April 9, 2007	CLH	Stock Option	Common Stock (2,500)	$1.81	April 27, 2008	2,500	Disposed
May 9, 2006	CLH	Employee Stock Option	Common Stock (2,000)	$1.75	July 24, 2007	2,000	Disposed
Sept. 1, 2005	CLH	Exercise of employee stock option	Common Stock (3,000)	$2.13	Dec. 8, 2005	3,000	Disposed
April 7, 2005	CLH	Exercise of Employee Stock Option	Common Stock (3,750)	$2.42	July 25, 2005	3,750	Disposed
March 1, 2005	CLH	Exercise of Employee stock option	Common Stock (10,000)	$2.42	March 3, 2005	10,000	Disposed
Sept. 30, 2004	CLH	Exercise of Employee stock option	Common Stock (3,000)	$2.12	Dec. 8, 2005	3,000	Disposed

Exercise/conversion price is blank when not applicable (e.g. RSUs).