Michael J Twohig

CIK 1220474 · View on SEC EDGAR ↗

Insider

First SEC filing: April 5, 2021 · Latest: April 5, 2021

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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 March 15, 2021

Insider transactions

0 buys (P) 0 sells (S) Net: $0 + 88 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

88 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Dec. 15, 2022	CLH	F	163	$116.50	$18,990	31,147 Direct	-0.52%	Disposed	179.1% (price as of 2026-08-20)
July 1, 2022	CLH	F	716	$90.32	$64,669	31,310 Direct	-2.24%	Disposed	260.1% (price as of 2026-08-20)
April 1, 2022	CLH	F	490	$112.93	$55,336	32,026 Direct	-1.51%	Disposed	188.0% (price as of 2026-08-20)
March 15, 2022	CLH	F	48	$105.77	$5,077	32,516 Direct	-0.15%	Disposed	207.5% (price as of 2026-08-20)
March 10, 2022	CLH	D	496	—	—	32,564 Direct	-1.50%	Disposed	(price as of 2026-08-20)
Feb. 7, 2022	CLH	A	1,109	—	—	33,060 Direct	+3.47%	Acquired	(price as of 2026-08-20)
Feb. 7, 2022	CLH	A	4,066	—	—	31,951 Direct	+14.58%	Acquired	(price as of 2026-08-20)
Dec. 15, 2021	CLH	F	453	$98.73	$44,725	27,885 Direct	-1.60%	Disposed	229.4% (price as of 2026-08-20)
July 1, 2021	CLH	F	429	$93.23	$39,996	28,338 Direct	-1.49%	Disposed	248.8% (price as of 2026-08-20)
July 1, 2021	CLH	A	1,177	—	—	28,767 Direct	+4.27%	Acquired	(price as of 2026-08-20)
July 1, 2021	CLH	A	4,314	—	—	27,590 Direct	+18.53%	Acquired	(price as of 2026-08-20)
June 1, 2021	CLH	F	117	$94.13	$11,013	23,276 Direct	-0.50%	Disposed	245.5% (price as of 2026-08-20)
April 1, 2021	CLH	F	490	$86.15	$42,214	23,393 Direct	-2.05%	Disposed	277.5% (price as of 2026-08-20)
March 15, 2021	CLH	S	4,557	$88.32	$402,474	24,979 Direct	-15.43%	Disposed	268.2% (price as of 2026-08-20)
March 15, 2021	CLH	F	330	$89.50	$29,535	24,649 Direct	-1.32%	Disposed	263.4% (price as of 2026-08-20)
March 15, 2021	CLH	D	766	—	—	23,883 Direct	-3.11%	Disposed	(price as of 2026-08-20)
Dec. 15, 2020	CLH	F	201	$72.99	$14,671	29,536 Direct	-0.68%	Disposed	345.5% (price as of 2026-08-20)
July 1, 2020	CLH	F	296	$58.30	$17,257	29,737 Direct	-0.99%	Disposed	457.8% (price as of 2026-08-20)
July 1, 2020	CLH	A	2,478	—	—	30,003 Direct	+9.00%	Acquired	(price as of 2026-08-20)
July 1, 2020	CLH	A	1,858	—	—	27,555 Direct	+7.23%	Acquired	(price as of 2026-08-20)
June 1, 2020	CLH	F	206	$60.78	$12,521	25,697 Direct	-0.80%	Disposed	435.0% (price as of 2026-08-20)
April 1, 2020	CLH	F	979	$45.91	$44,946	25,903 Direct	-3.64%	Disposed	608.3% (price as of 2026-08-20)
March 15, 2020	CLH	F	122	$54.33	$6,628	26,882 Direct	-0.45%	Disposed	498.6% (price as of 2026-08-20)
Dec. 27, 2019	CLH	S	2,500	$86.67	$216,675	27,004 Direct	-8.47%	Disposed	275.2% (price as of 2026-08-20)
Dec. 15, 2019	CLH	F	314	$83.68	$26,276	29,504 Direct	-1.05%	Disposed	288.6% (price as of 2026-08-20)
July 1, 2019	CLH	A	1,436	—	—	29,818 Direct	+5.06%	Acquired	(price as of 2026-08-20)
July 1, 2019	CLH	A	1,915	—	—	28,382 Direct	+7.24%	Acquired	(price as of 2026-08-20)
June 3, 2019	CLH	F	522	$64.12	$33,471	26,467 Direct	-1.93%	Disposed	407.2% (price as of 2026-08-20)
April 1, 2019	CLH	F	981	$72.00	$70,632	26,989 Direct	-3.51%	Disposed	351.7% (price as of 2026-08-20)
April 1, 2019	CLH	A	5,000	—	—	27,970 Direct	+21.77%	Acquired	(price as of 2026-08-20)
March 15, 2019	CLH	F	261	$68.74	$17,941	22,970 Direct	-1.12%	Disposed	373.1% (price as of 2026-08-20)
March 13, 2019	CLH	D	1,456	—	—	23,231 Direct	-5.90%	Disposed	(price as of 2026-08-20)
Dec. 14, 2018	CLH	F	92	$55.53	$5,109	24,687 Direct	-0.37%	Disposed	485.6% (price as of 2026-08-20)
Sept. 6, 2018	CLH	S	4,211	$69.65	$293,296	24,779 Direct	-14.53%	Disposed	366.9% (price as of 2026-08-20)
July 1, 2018	CLH	A	1,869	—	—	28,990 Direct	+6.89%	Acquired	(price as of 2026-08-20)
July 1, 2018	CLH	A	2,492	—	—	27,121 Direct	+10.12%	Acquired	(price as of 2026-08-20)
June 5, 2018	CLH	S	2,836	$53.43	$151,527	24,629 Direct	-10.33%	Disposed	508.6% (price as of 2026-08-20)
June 1, 2018	CLH	F	350	$53.69	$18,792	27,465 Direct	-1.26%	Disposed	505.7% (price as of 2026-08-20)
April 2, 2018	CLH	F	982	$48.81	$47,931	27,815 Direct	-3.41%	Disposed	566.3% (price as of 2026-08-20)
March 15, 2018	CLH	F	144	$49.98	$7,197	28,797 Direct	-0.50%	Disposed	550.7% (price as of 2026-08-20)
Feb. 28, 2018	CLH	F	1,583	—	—	28,941 Direct	-5.19%	Disposed	(price as of 2026-08-20)
Dec. 15, 2017	CLH	F	180	$52.17	$9,391	30,524 Direct	-0.59%	Disposed	523.3% (price as of 2026-08-20)
July 1, 2017	CLH	A	1,680	—	—	30,704 Direct	+5.79%	Acquired	(price as of 2026-08-20)
July 1, 2017	CLH	A	2,241	—	—	29,024 Direct	+8.37%	Acquired	(price as of 2026-08-20)
June 2, 2017	CLH	S	4,071	$59.25	$241,207	26,783 Direct	-13.19%	Disposed	448.9% (price as of 2026-08-20)
June 1, 2017	CLH	F	262	$59.25	$15,524	30,854 Direct	-0.84%	Disposed	448.9% (price as of 2026-08-20)
April 1, 2017	CLH	A	5,000	—	—	31,655 Direct	+18.76%	Acquired	(price as of 2026-08-20)
March 31, 2017	CLH	F	539	$55.62	$29,979	31,116 Direct	-1.70%	Disposed	484.7% (price as of 2026-08-20)
March 30, 2017	CLH	F	95	$50.05	$4,755	26,655 Direct	-0.36%	Disposed	549.8% (price as of 2026-08-20)
March 16, 2017	CLH	F	269	$55.74	$14,994	26,750 Direct	-1.00%	Disposed	483.4% (price as of 2026-08-20)
March 8, 2017	CLH	D	1,615	—	—	27,019 Direct	-5.64%	Disposed	(price as of 2026-08-20)
Dec. 15, 2016	CLH	F	93	$57.13	$5,313	28,634 Direct	-0.32%	Disposed	469.2% (price as of 2026-08-20)
Dec. 15, 2016	CLH	S	2,154	$56.59	$121,895	28,727 Direct	-6.98%	Disposed	474.7% (price as of 2026-08-20)
June 21, 2016	CLH	F	108	$51.86	$5,601	30,881 Direct	-0.35%	Disposed	527.1% (price as of 2026-08-20)
June 7, 2016	CLH	A	2,643	—	—	30,989 Direct	+9.32%	Acquired	(price as of 2026-08-20)
June 7, 2016	CLH	A	1,982	—	—	28,346 Direct	+7.52%	Acquired	(price as of 2026-08-20)
April 1, 2016	CLH	F	263	$49.83	$13,105	26,364 Direct	-0.99%	Disposed	552.6% (price as of 2026-08-20)
April 1, 2016	CLH	A	5,000	—	—	26,627 Direct	+23.12%	Acquired	(price as of 2026-08-20)
March 30, 2016	CLH	F	79	$49.70	$3,926	21,627 Direct	-0.36%	Disposed	554.3% (price as of 2026-08-20)
March 29, 2016	CLH	S	2,000	$48.50	$97,000	21,706 Direct	-8.44%	Disposed	570.5% (price as of 2026-08-20)
March 15, 2016	CLH	F	343	$45.77	$15,699	23,706 Direct	-1.43%	Disposed	610.5% (price as of 2026-08-20)
March 8, 2016	CLH	D	1,385	—	—	24,049 Direct	-5.45%	Disposed	(price as of 2026-08-20)
Dec. 15, 2015	CLH	F	45	$41.11	$1,850	25,434 Direct	-0.18%	Disposed	691.0% (price as of 2026-08-20)
June 22, 2015	CLH	F	112	$55.34	$6,198	25,479 Direct	-0.44%	Disposed	487.6% (price as of 2026-08-20)
June 9, 2015	CLH	A	2,020	—	—	25,591 Direct	+8.57%	Acquired	(price as of 2026-08-20)
June 9, 2015	CLH	A	1,515	—	—	23,571 Direct	+6.87%	Acquired	(price as of 2026-08-20)
April 1, 2015	CLH	F	272	$57.11	$15,534	22,056 Direct	-1.22%	Disposed	469.4% (price as of 2026-08-20)
March 30, 2015	CLH	F	245	$56.69	$13,889	22,328 Direct	-1.09%	Disposed	473.6% (price as of 2026-08-20)
March 15, 2015	CLH	F	45	$56.32	$2,534	22,573 Direct	-0.20%	Disposed	477.4% (price as of 2026-08-20)
March 10, 2015	CLH	D	1,642	—	—	22,618 Direct	-6.77%	Disposed	(price as of 2026-08-20)
June 20, 2014	CLH	F	334	$63.10	$21,075	24,260 Direct	-1.36%	Disposed	415.4% (price as of 2026-08-20)
June 18, 2014	CLH	A	1,846	—	—	24,594 Direct	+8.11%	Acquired	(price as of 2026-08-20)
June 18, 2014	CLH	A	1,384	—	—	22,748 Direct	+6.48%	Acquired	(price as of 2026-08-20)
April 1, 2014	CLH	F	272	$53.20	$14,470	21,364 Direct	-1.26%	Disposed	511.3% (price as of 2026-08-20)
Feb. 26, 2014	CLH	D	1,670	—	—	21,636 Direct	-7.17%	Disposed	(price as of 2026-08-20)
May 6, 2013	CLH	A	2,053	—	—	23,306 Direct	+9.66%	Acquired	(price as of 2026-08-20)
May 6, 2013	CLH	A	1,540	—	—	21,253 Direct	+7.81%	Acquired	(price as of 2026-08-20)
March 15, 2013	CLH	A	2,500	—	—	19,713 Direct	+14.52%	Acquired	(price as of 2026-08-20)
Dec. 15, 2012	CLH	F	800	$56.05	$44,840	17,213 Direct	-4.44%	Disposed	480.2% (price as of 2026-08-20)
Aug. 27, 2012	CLH	M	10,400	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Aug. 27, 2012	CLH	S	10,400	$55.05	$572,520	18,013 Direct	-36.60%	Disposed	490.7% (price as of 2026-08-20)
Aug. 27, 2012	CLH	M	10,400	$6.49	$67,496	28,413 Direct	+57.74%	Acquired	4910.8% (price as of 2026-08-20)
Aug. 22, 2012	CLH	M	5,549	—	—	10,400 Direct	-34.79%	Disposed	(price as of 2026-08-20)
Aug. 22, 2012	CLH	S	5,549	$56.03	$310,910	18,013 Direct	-23.55%	Disposed	480.4% (price as of 2026-08-20)
Aug. 22, 2012	CLH	M	5,549	$6.49	$36,013	23,562 Direct	+30.81%	Acquired	4910.8% (price as of 2026-08-20)
Aug. 21, 2012	CLH	M	2,551	—	—	15,949 Direct	-13.79%	Disposed	(price as of 2026-08-20)
Aug. 21, 2012	CLH	S	2,551	$56.63	$144,463	18,013 Direct	-12.41%	Disposed	474.3% (price as of 2026-08-20)
Aug. 21, 2012	CLH	M	2,551	$6.49	$16,556	20,564 Direct	+14.16%	Acquired	4910.8% (price as of 2026-08-20)
March 30, 2012	CLH	A	1,253	—	—	18,013 Direct	+7.48%	Acquired	(price as of 2026-08-20)
March 30, 2012	CLH	A	1,670	—	—	16,760 Direct	+11.07%	Acquired	(price as of 2026-08-20)
March 15, 2012	CLH	F	362	$68.96	$24,964	15,090 Direct	-2.34%	Disposed	371.6% (price as of 2026-08-20)
Dec. 15, 2011	CLH	F	769	$58.59	$45,056	15,452 Direct	-4.74%	Disposed	455.0% (price as of 2026-08-20)
Dec. 15, 2011	CLH	F	425	$58.59	$24,901	16,221 Direct	-2.55%	Disposed	455.0% (price as of 2026-08-20)
Dec. 15, 2011	CLH	F	188	$58.59	$11,015	16,646 Direct	-1.12%	Disposed	455.0% (price as of 2026-08-20)
Sept. 20, 2011	CLH	S	1,500	$56.65	$84,975	16,834 Direct	-8.18%	Disposed	474.1% (price as of 2026-08-20)
Sept. 20, 2011	CLH	M	1,500	$6.49	$9,735	18,334 Direct	+8.91%	Acquired	4910.8% (price as of 2026-08-20)
Sept. 20, 2011	CLH	M	1,500	$6.49	$9,735	18,500 Direct	-7.50%	Disposed	4910.8% (price as of 2026-08-20)
Sept. 20, 2011	CLH	S	1,500	$56.65	$84,975	8,417 Direct	-15.13%	Disposed	474.1% (price as of 2026-08-20)
Sept. 20, 2011	CLH	M	1,500	$6.49	$9,735	9,917 Direct	+17.82%	Acquired	4910.8% (price as of 2026-08-20)
June 20, 2011	CLH	A	855	—	—	8,417 Direct	+11.31%	Acquired	(price as of 2026-08-20)

Showing latest 100 of 138 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
Aug. 27, 2012	CLH	Employee Stock Option	Common Stock (10,400)	$6.49	Feb. 21, 2013	10,400	Disposed
Aug. 22, 2012	CLH	Employee Stock Option	Common Stock (5,549)	$6.49	Feb. 21, 2013	5,549	Disposed
Aug. 21, 2012	CLH	Employee Stock Option	Common Stock (2,551)	$6.49	Feb. 21, 2013	2,551	Disposed
Sept. 20, 2011	CLH	Employee Stock Option	Common Stock (1,500)	$6.49	Feb. 21, 2013	1,500	Disposed
Dec. 6, 2010	CLH	Common Stock	Common Stock (3,000)	$12.98	Feb. 21, 2013	3,000	Disposed
Dec. 6, 2010	CLH	Common Stock	Common Stock (1,000)	$6.46	March 15, 2012	1,000	Disposed
Dec. 19, 2008	CLH	Employee Stock Option	Common Stock (1,000)	$6.46	March 15, 2012	1,000	Disposed
Dec. 12, 2006	CLH	Employee stock option	Common Stock (2,000)	$12.98	Feb. 21, 2013	2,000	Disposed
Dec. 12, 2006	CLH	Employee stock option	Common Stock (2,500)	$6.46	March 15, 2012	2,500	Disposed
June 2, 2006	CLH	Exercise of Employee Stock Option	Common Stock (2,500)	$6.46	March 15, 2012	2,500	Disposed
April 1, 2005	CLH	Employee Stock Option	Common Stock (10,000)	$6.46	March 15, 2012	3,000	Disposed
April 1, 2005	CLH	Employee Stock Option	Common Stock (6,000)	$2.50	Feb. 25, 2010	6,000	Disposed

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