John T Preston

Insider

First SEC filing: Feb. 4, 2010 · Latest: Jan. 23, 2018

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. 8, 2022

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 25 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

25 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
May 20, 2026	CLH	A	652	—	—	7,044 Direct	+10.20%	Acquired	(price as of 2026-08-20)
Aug. 8, 2022	CLH	S	2,168	$111.50	$241,732	11,377 Direct	-16.01%	Disposed	191.7% (price as of 2026-08-20)
May 25, 2022	CLH	A	1,849	—	—	13,545 Direct	+15.81%	Acquired	(price as of 2026-08-20)
Jan. 3, 2022	CLH	A	257	—	—	11,696 Direct	+2.25%	Acquired	(price as of 2026-08-20)
June 3, 2021	CLH	A	1,513	—	—	11,439 Direct	+15.24%	Acquired	(price as of 2026-08-20)
Feb. 26, 2021	CLH	S	6,000	$85.49	$512,940	9,926 Direct	-37.67%	Disposed	280.4% (price as of 2026-08-20)
June 3, 2020	CLH	A	2,168	—	—	15,926 Direct	+15.76%	Acquired	(price as of 2026-08-20)
June 5, 2019	CLH	A	2,095	—	—	13,758 Direct	+17.96%	Acquired	(price as of 2026-08-20)
June 6, 2018	CLH	A	2,236	—	—	11,663 Direct	+23.72%	Acquired	(price as of 2026-08-20)
March 6, 2018	CLH	S	5,000	$50.93	$254,650	9,427 Direct	-34.66%	Disposed	538.5% (price as of 2026-08-20)
June 7, 2017	CLH	A	2,057	—	—	17,027 Direct	+13.74%	Acquired	(price as of 2026-08-20)
June 8, 2016	CLH	A	2,210	—	—	14,970 Direct	+17.32%	Acquired	(price as of 2026-08-20)
June 10, 2015	CLH	A	1,786	—	—	12,760 Direct	+16.27%	Acquired	(price as of 2026-08-20)
May 13, 2015	CLH	S	4,523	$56.06	$253,559	10,974 Direct	-29.19%	Disposed	480.1% (price as of 2026-08-20)
June 18, 2014	CLH	A	1,608	—	—	15,497 Direct	+11.58%	Acquired	(price as of 2026-08-20)
Oct. 1, 2013	CLH	A	249	$58.60	$14,591	13,889 Direct	+1.83%	Acquired	454.9% (price as of 2026-08-20)
May 6, 2013	CLH	A	1,334	—	—	13,640 Direct	+10.84%	Acquired	(price as of 2026-08-20)
May 7, 2012	CLH	A	1,140	—	—	12,306 Direct	+10.21%	Acquired	(price as of 2026-08-20)
April 7, 2011	CLH	S	6,000	$104.61	$627,660	5,583 Direct	-51.80%	Disposed	521.7% (price as of 2026-08-20)
April 7, 2011	CLH	M	6,000	$34.77	$208,620	11,583 Direct	+107.47%	Acquired	1770.6% (price as of 2026-08-20)
May 10, 2010	CLH	A	383	—	—	5,583 Direct	+7.37%	Acquired	(price as of 2026-08-20)
June 12, 2009	CLH	A	300	—	—	6,900 Direct	+4.55%	Acquired	(price as of 2026-08-20)
May 11, 2009	CLH	A	2,700	—	—	6,600 Direct	+69.23%	Acquired	(price as of 2026-08-20)
May 15, 2008	CLH	A	300	—	—	3,900 Direct	+8.33%	Acquired	(price as of 2026-08-20)
March 18, 2008	CLH	M	6,000	$10.37	$62,220	0 Direct	-100.00%	Disposed	6171.9% (price as of 2026-08-20)
March 18, 2008	CLH	S	6,000	$63.07	$378,420	3,600 Direct	-62.50%	Disposed	931.2% (price as of 2026-08-20)
March 18, 2008	CLH	M	6,000	$10.37	$62,220	9,600 Direct	+166.67%	Acquired	6171.9% (price as of 2026-08-20)
May 18, 2007	CLH	A	300	—	—	3,600 Direct	+9.09%	Acquired	(price as of 2026-08-20)
Sept. 20, 2006	CLH	A	300	—	—	3,300 Direct	+10.00%	Acquired	(price as of 2026-08-20)
Dec. 8, 2004	CLH	M	16,000	$1.88	$30,080	19,000 Direct	+533.33%	Acquired	34495.7% (price as of 2026-08-20)
Dec. 8, 2004	CLH	S	16,000	$12.48	$199,680	3,000 Direct	-84.21%	Disposed	5111.5% (price as of 2026-08-20)
Dec. 8, 2004	CLH	M	16,000	$1.87	$29,920	0 Direct	-100.00%	Disposed	34680.7% (price as of 2026-08-20)

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
March 18, 2008	CLH	Common Stock	Common Stock (6,000)	$10.37	May 15, 2008	6,000	Disposed
Dec. 8, 2004	CLH	Stock Option	Common Stock (16,000)	$1.87	June 16, 2005	16,000	Disposed

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