Andrea Robertson

Insider

First SEC filing: Sept. 23, 2004 · Latest: Sept. 23, 2004

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.
Initial holdings The stakes this person held when they first started reporting.

Insider at

CLH selling Aug. 3, 2026

Insider transactions

0 buys (P) 1 sells (S) Net: $-247,754 + 36 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

36 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Aug. 3, 2026	CLH	S	789	$314.01	$247,754	8,979 Direct	-8.08%	Disposed	3.6% (price as of 2026-08-20)
May 20, 2026	CLH	A	652	—	—	9,768 Direct	+7.15%	Acquired	(price as of 2026-08-20)
May 11, 2026	CLH	G	342	—	—	9,116 Direct	-3.62%	Disposed	(price as of 2026-08-20)
Aug. 8, 2023	CLH	S	1,200	$169.08	$202,896	10,667 Direct	-10.11%	Disposed	92.3% (price as of 2026-08-20)
May 24, 2023	CLH	A	1,148	—	—	11,867 Direct	+10.71%	Acquired	(price as of 2026-08-20)
Aug. 5, 2022	CLH	S	1,095	$106.37	$116,475	10,719 Direct	-9.27%	Disposed	205.7% (price as of 2026-08-20)
May 25, 2022	CLH	A	1,849	—	—	11,814 Direct	+18.55%	Acquired	(price as of 2026-08-20)
March 3, 2022	CLH	G	500	—	—	9,965 Direct	-4.78%	Disposed	(price as of 2026-08-20)
Feb. 25, 2022	CLH	S	1,000	$95.30	$95,300	10,465 Direct	-8.72%	Disposed	241.2% (price as of 2026-08-20)
Jan. 3, 2022	CLH	A	257	—	—	1,295 Direct	+24.76%	Acquired	(price as of 2026-08-20)
Aug. 5, 2021	CLH	S	2,168	$99.14	$214,936	11,208 Direct	-16.21%	Disposed	228.0% (price as of 2026-08-20)
June 3, 2021	CLH	A	1,513	—	—	13,376 Direct	+12.75%	Acquired	(price as of 2026-08-20)
Feb. 25, 2021	CLH	S	1,500	$89.42	$134,130	11,863 Direct	-11.23%	Disposed	263.7% (price as of 2026-08-20)
Nov. 10, 2020	CLH	S	1,272	$71.90	$91,457	13,363 Direct	-8.69%	Disposed	352.3% (price as of 2026-08-20)
June 3, 2020	CLH	A	2,168	—	—	14,635 Direct	+17.39%	Acquired	(price as of 2026-08-20)
Oct. 31, 2019	CLH	S	1,000	$83.78	$83,780	12,467 Direct	-7.43%	Disposed	288.2% (price as of 2026-08-20)
Aug. 1, 2019	CLH	S	2,557	$78.98	$201,952	13,467 Direct	-15.96%	Disposed	311.7% (price as of 2026-08-20)
June 5, 2019	CLH	A	2,095	—	—	16,024 Direct	+15.04%	Acquired	(price as of 2026-08-20)
March 5, 2019	CLH	S	1,000	$66.75	$66,750	13,929 Direct	-6.70%	Disposed	387.2% (price as of 2026-08-20)
Nov. 1, 2018	CLH	S	1,500	$68.31	$102,465	14,929 Direct	-9.13%	Disposed	376.1% (price as of 2026-08-20)
Aug. 2, 2018	CLH	S	2,000	$63.62	$127,240	16,429 Direct	-10.85%	Disposed	411.2% (price as of 2026-08-20)
June 6, 2018	CLH	A	2,236	—	—	18,429 Direct	+13.81%	Acquired	(price as of 2026-08-20)
June 7, 2017	CLH	A	2,057	—	—	16,193 Direct	+14.55%	Acquired	(price as of 2026-08-20)
May 5, 2017	CLH	S	1,034	$60.62	$62,681	14,136 Direct	-6.82%	Disposed	436.5% (price as of 2026-08-20)
Feb. 24, 2017	CLH	S	2,000	$56.51	$113,020	15,170 Direct	-11.65%	Disposed	475.5% (price as of 2026-08-20)
Feb. 24, 2017	CLH	M	2,000	$23.00	$46,000	0 Direct	-100.00%	Disposed	1313.9% (price as of 2026-08-20)
Feb. 24, 2017	CLH	M	2,000	$23.00	$46,000	17,170 Direct	+13.18%	Acquired	1313.9% (price as of 2026-08-20)
Aug. 4, 2016	CLH	S	1,608	$50.62	$81,397	15,170 Direct	-9.58%	Disposed	542.4% (price as of 2026-08-20)
Aug. 4, 2016	CLH	M	2,000	$23.00	$46,000	17,170 Direct	+13.18%	Acquired	1313.9% (price as of 2026-08-20)
Aug. 4, 2016	CLH	S	2,000	$51.03	$102,060	15,170 Direct	-11.65%	Disposed	537.3% (price as of 2026-08-20)
Aug. 4, 2016	CLH	M	2,000	$23.00	$46,000	2,000 Direct	-50.00%	Disposed	1313.9% (price as of 2026-08-20)
June 8, 2016	CLH	A	2,210	—	—	16,778 Direct	+15.17%	Acquired	(price as of 2026-08-20)
June 10, 2015	CLH	A	1,786	—	—	14,568 Direct	+13.97%	Acquired	(price as of 2026-08-20)
Aug. 8, 2014	CLH	S	1,583	$58.14	$92,036	12,782 Direct	-11.02%	Disposed	459.3% (price as of 2026-08-20)
June 18, 2014	CLH	A	1,608	—	—	14,365 Direct	+12.60%	Acquired	(price as of 2026-08-20)
Oct. 1, 2013	CLH	A	249	$58.60	$14,591	12,757 Direct	+1.99%	Acquired	454.9% (price as of 2026-08-20)
May 6, 2013	CLH	A	1,334	—	—	12,508 Direct	+11.94%	Acquired	(price as of 2026-08-20)
Nov. 29, 2012	CLH	S	500	$57.33	$28,665	11,174 Direct	-4.28%	Disposed	467.2% (price as of 2026-08-20)
May 21, 2012	CLH	S	1,000	$62.00	$62,000	11,674 Direct	-7.89%	Disposed	424.5% (price as of 2026-08-20)
May 7, 2012	CLH	A	1,140	—	—	12,674 Direct	+9.88%	Acquired	(price as of 2026-08-20)
May 11, 2011	CLH	S	483	$102.14	$49,334	5,767 Direct	-7.73%	Disposed	536.8% (price as of 2026-08-20)
May 9, 2011	CLH	A	767	—	—	6,250 Direct	+13.99%	Acquired	(price as of 2026-08-20)
April 11, 2011	CLH	M	4,000	$46.01	$184,040	2,000 Direct	-66.67%	Disposed	1313.6% (price as of 2026-08-20)
April 11, 2011	CLH	S	4,000	$101.72	$406,880	5,483 Direct	-42.18%	Disposed	539.4% (price as of 2026-08-20)
April 11, 2011	CLH	M	4,000	$46.01	$184,040	9,483 Direct	+72.95%	Acquired	1313.6% (price as of 2026-08-20)
May 10, 2010	CLH	A	1,283	—	—	5,483 Direct	+30.55%	Acquired	(price as of 2026-08-20)
June 12, 2009	CLH	A	300	—	—	4,200 Direct	+7.69%	Acquired	(price as of 2026-08-20)
Nov. 10, 2008	CLH	M	1,833	$7.52	$13,784	0 Direct	-100.00%	Disposed	8548.9% (price as of 2026-08-20)
Nov. 10, 2008	CLH	S	1,833	$64.71	$118,613	3,900 Direct	-31.97%	Disposed	905.1% (price as of 2026-08-20)
Nov. 10, 2008	CLH	M	1,833	$7.52	$13,784	5,733 Direct	+47.00%	Acquired	8548.9% (price as of 2026-08-20)
May 15, 2008	CLH	A	300	—	—	3,900 Direct	+8.33%	Acquired	(price as of 2026-08-20)
May 18, 2007	CLH	A	6,000	$46.01	$276,060	6,000 Direct	—	Acquired	1313.6% (price as of 2026-08-20)
May 18, 2007	CLH	A	300	—	—	3,600 Direct	+9.09%	Acquired	(price as of 2026-08-20)
May 15, 2007	CLH	M	3,000	$7.52	$22,560	1,833 Direct	-62.07%	Disposed	8548.9% (price as of 2026-08-20)
May 15, 2007	CLH	S	1,000	$46.63	$46,630	3,300 Direct	-23.26%	Disposed	1294.8% (price as of 2026-08-20)
May 15, 2007	CLH	M	3,000	$7.52	$22,560	4,300 Direct	+230.77%	Acquired	8548.9% (price as of 2026-08-20)
Sept. 20, 2006	CLH	A	300	—	—	1,300 Direct	+30.00%	Acquired	(price as of 2026-08-20)
Jan. 3, 2006	CLH	M	1,000	$7.52	$7,520	4,833 Direct	-17.14%	Disposed	8548.9% (price as of 2026-08-20)
Jan. 3, 2006	CLH	M	1,000	$7.52	$7,520	1,000 Direct	—	Acquired	8548.9% (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
Feb. 24, 2017	CLH	Exercise of Stock Option	Common Stock (2,000)	$23.00	May 17, 2017	2,000	Disposed
Aug. 4, 2016	CLH	Exercise of Stock Option	Common Stock (2,000)	$23.00	May 17, 2017	2,000	Disposed
April 11, 2011	CLH	Common Stock	Common Stock (4,000)	$46.01	May 17, 2017	4,000	Disposed
Nov. 10, 2008	CLH	Stock Option	Common Stock (1,833)	$7.52	June 14, 2009	1,833	Disposed
May 18, 2007	CLH	Nonemployee Director Stock Option	Common Stock (6,000)	$46.01	May 18, 2012	6,000	Acquired
May 15, 2007	CLH	Stock Option	Common Stock (4,833)	$7.52	June 14, 2009	3,000	Disposed
Jan. 3, 2006	CLH	Exercise of Stock Option	Common Stock (1,000)	$7.52	June 14, 2009	1,000	Disposed

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

Initial ownership (Form 3) 1 holding

Securities held when first becoming an insider, per SEC Form 3.

Date	Ticker	Security	Shares	Ownership
Sept. 23, 2004	CLH	Nonemployee Director stock options→ Common Stock (5,833)	5,833	Direct