Company · CIK 0001515156 · SIC 2890 — Miscellaneous Chemical Products · Nasdaq

Arq, Inc. · ARQ

Insider activity reported against this company. All insider holders · On EDGAR ↗

Period1M 3M 6M 1Y 2Y All datashares as filed — not split-adjusted

Open-market buys & salesbuys $6.5M · 9sales $1.1M · 6net $5.4M

Reported at this company — common stock

Trade	Reported (ET)	Insider	Shares	Avg price	Total	Owned after	Δ stake	Flags
Sep 8, 2026 PForm 4 →	Sep 10, 5:33 pm EDT	Shimon SteinmetzChief Financial Officer	2,972	$2.34	$6,953	15,000	+24.7%
Sep 4, 2026 PForm 4 →	Sep 9, 5:32 pm EDT	Shimon SteinmetzChief Financial Officer	5,758	$2.28	$13,113	13,126	+78.1%
Sep 3, 2026 PForm 4 →	Sep 8, 5:32 pm EDT	Shimon SteinmetzChief Financial Officer	16,270	$2.22	$36,148	8,770	—
Sep 1, 2026 AForm 4 →	Sep 3, 5:32 pm EDT	Peter Oluoch OwinoChief Accounting Officer	161,047	—	—	161,047	—
Aug 14, 2026 AForm 4 →	Aug 18, 5:10 pm EDT	Joseph M WongChief Technology Officer	55,000	—	—	506,648	—
Aug 1, 2026 AForm 4 →	Aug 4, 8:30 pm EDT	Claiborne Benson SmithGen Counsel, Corp Secretary	61,047	—	—	155,513	—
Aug 1, 2026 AForm 4 →	Aug 4, 8:29 pm EDT	Joseph M WongChief Technology Officer	61,047	—	—	451,648	—
Jul 31, 2026 AForm 4 →	Aug 4, 8:31 pm EDT	Shimon SteinmetzChief Financial Officer	343,023	—	—	343,023	—
Jul 1, 2026 AForm 4 →	Jul 6, 5:32 pm EDT	Carol S EicherDirector	24,641	—	—	198,651	—
Jul 1, 2026 AForm 4 →	Jul 6, 5:32 pm EDT	Jeremy BlankDirector	49,283	—	—	128,045	—
Jul 1, 2026 AForm 4 →	Jul 6, 5:32 pm EDT	Laurie BergmanDirector	24,641	—	—	76,343	—
Jul 1, 2026 AForm 4 →	Jul 6, 5:32 pm EDT	Julian Alexander McIntyreDirector	49,283	—	—	108,261	—
Jul 1, 2026 AForm 4 →	Jul 6, 5:32 pm EDT	Richard Campbell-BreedenDirector	49,283	—	—	136,151	—
Jan 2, 2019 FForm 4 →	Jan 4, 5:45 pm EST	L Heath SampsonPresident & CEO, Director	7,557	$10.70	$80,860	257,222	—	plan?
Dec 31, 2018 PForm 4 →	Jan 3, 2019, 6:47 pm EST	Alta Fundamental Advisers LLC +1Director	55,000	$10.34	$568,794	1,371,379	+4.18%	plan?
Dec 31, 2018 SForm 4 →	Jan 3, 2019, 6:47 pm EST	Alta Fundamental Advisers LLC +1Director	45,000	$10.28	$462,739	1,316,379	−3.31%	plan?
Dec 28, 2018 SForm 4 →	Dec 31, 4:48 pm EST	Alta Fundamental Advisers LLC +1Director	50,000	$9.94	$496,980	1,306,379	−3.69%	plan?
Dec 27, 2018 PForm 4 →	Dec 31, 4:48 pm EST	Alta Fundamental Advisers LLC +1Director	65,000	$9.97	$647,843	1,361,379	+5.01%	plan?
Oct 16, 2018 FForm 4 →	Oct 18, 5:43 pm EDT	L Heath SampsonPresident & CEO, Director	5,497	$10.62	$58,378	264,779	—	plan?
Aug 14, 2018 FMForm 4 →	Aug 16, 5:31 pm EDT	L Heath SampsonPresident & CEO, Director	166,665	$9.60	$1,599,943	270,276	—	plan?
Jul 1, 2018 AForm 4 →	Jul 3, 5:56 pm EDT	Alta Fundamental Advisers LLC +1Director	13,014	—	—	1,346,379	—	plan?
Jul 1, 2018 AForm 4 →	Jul 3, 5:45 pm EDT	Louis Spencer WellsDirector	3,904	—	—	20,969	—	plan?
Jul 1, 2018 AForm 4 →	Jul 3, 5:40 pm EDT	Taylor J. SimontonDirector	3,904	—	—	21,013	—	plan?
Jul 1, 2018 AForm 4 →	Jul 3, 5:29 pm EDT	R Carter PateDirector	3,904	—	—	14,958	—	plan?
Jun 29, 2018 PForm 4 →	Jul 3, 5:56 pm EDT	Alta Fundamental Advisers LLC +1Director	27,011	$11.29	$304,822	1,333,365	+2.07%	plan?
Jun 28, 2018 PForm 4 →	Jul 2, 6:58 pm EDT	Alta Fundamental Advisers LLC +1Director	20,020	$11.11	$222,464	1,306,354	+1.56%	plan?
May 24, 2018 SForm 4 →	May 29, 5:13 pm EDT	Ron HansonSVP of Operations of ADA-ES	1,228	$11.12	$13,655	33,863	−3.50%	plan?
Mar 23, 2018 AFForm 4 →	Mar 27, 5:34 pm EDT	Theodore James SandersGeneral Counsel	13,157	$10.95	$10,238	26,580	—	plan?
Mar 23, 2018 AFForm 4 →	Mar 27, 5:32 pm EDT	Greg MarkenChief Financial Officer	18,286	$10.95	$17,728	46,629	—	plan?
Mar 23, 2018 AFForm 4 →	Mar 27, 5:28 pm EDT	Ron HansonSVP of Operations of ADA-ES	12,925	$10.95	$14,991	35,091	—	plan?
Mar 23, 2018 AForm 4 →	Mar 27, 5:27 pm EDT	L Heath SampsonPresident & CEO, Director	55,555	—	—	251,609	—	plan?
Mar 23, 2018 AFForm 4 →	Mar 27, 5:22 pm EDT	Sharon SjostromChief Product Officer	12,521	$10.95	$10,567	66,506	—	plan?
Mar 1, 2018 FMForm 4 →	Mar 5, 6:32 pm EST	Sharon SjostromChief Product Officer	5,462	$9.73	$13,564	55,915	—	plan?
Mar 1, 2018 FMForm 4 →	Mar 5, 6:10 pm EST	L Heath SampsonPresident & CEO, Director	14,971	$9.73	$25,950	196,054	—	plan?
Jan 12, 2018 FForm 4 →	Jan 17, 7:16 pm EST	Greg MarkenChief Accounting Officer	950	$8.84	$8,398	31,581	—	plan?
Jan 2, 2018 FForm 4 →	Jan 4, 5:49 pm EST	L Heath SampsonPresident & CEO, Director	9,878	$9.50	$93,841	186,417	—	plan?
Jan 2, 2018 FForm 4 →	Jan 4, 5:43 pm EST	Sharon SjostromChief Product Officer	599	$9.50	$5,691	53,241	—	plan?
Dec 28, 2017 JForm 5 →	Feb 13, 2018, 5:39 pm EST	Ron HansonSVP of Operations of ADA-ES	664	$9.43	$6,262	24,904	—	plan?
Dec 28, 2017 JForm 5 →	Feb 13, 2018, 5:35 pm EST	Theodore James SandersGeneral Counsel	188	$9.43	$1,773	15,293	—	plan?
Dec 13, 2017 PForm 4 →	Dec 15, 5:52 pm EST	Alta Fundamental Advisers LLC +1Director	262,266	$9.89	$2,593,145	1,286,334	+25.6%	plan?
Dec 6, 2017 SForm 4 →	Dec 8, 5:18 pm EST	Alan Bradley GabbardDirector	10,000	$8.17	$81,717	34,480	−22.5%	plan?
Oct 16, 2017 FForm 4 →	Oct 18, 6:54 pm EDT	L Heath SampsonPresident & CEO, Director	3,997	$11.42	$45,646	196,295	—	plan?
Jul 1, 2017 AForm 4 →	Jul 5, 6:59 pm EDT	R Carter PateDirector	4,842	—	—	11,054	—	plan?
Jul 1, 2017 AForm 4 →	Jul 5, 6:45 pm EDT	Derek JohnsonDirector	6,456	—	—	47,000	—	plan?
Jul 1, 2017 AForm 4 →	Jul 5, 6:42 pm EDT	Taylor J. SimontonDirector	4,842	—	—	17,109	—	plan?
Jul 1, 2017 AForm 4 →	Jul 5, 6:39 pm EDT	Louis Spencer WellsDirector	4,842	—	—	17,065	—	plan?
Jul 1, 2017 AForm 4 →	Jul 5, 6:22 pm EDT	Alan Bradley GabbardDirector	4,842	—	—	44,480	—	plan?
Jun 28, 2017 SForm 4 →	Jun 30, 5:40 pm EDT	Alan Bradley GabbardDirector	4,700	$9.21	$43,266	39,638	−10.6%	plan?
Jun 26, 2017 GForm 4 →	Jun 27, 6:55 pm EDT	Alan Bradley GabbardDirector	1,500	—	—	44,338	—	plan?
Jun 23, 2017 SForm 4 →	Jun 27, 6:55 pm EDT	Alan Bradley GabbardDirector	300	$9.52	$2,856	45,838	−0.65%	plan?
Jun 12, 2017 DForm 4 →	Jun 14, 7:58 pm EDT	Alta Fundamental Advisers LLCDirector	70,178	$9.40	$659,673	1,024,068	—	plan?
Jun 12, 2017 FForm 4 →	Jun 14, 5:16 pm EDT	Greg MarkenChief Accounting Officer	1,599	$9.49	$15,175	32,531	—	plan?
Jun 12, 2017 FForm 4 →	Jun 14, 5:11 pm EDT	Ron HansonSVP of Operations of ADA-ES	1,599	$9.49	$15,175	25,569	—	plan?
May 10, 2017 DForm 4 →	May 12, 4:32 pm EDT	Sharon SjostromChief Product Officer	6,396	—	—	70,372	—	plan?
Apr 14, 2017 FForm 4 →	Apr 18, 6:50 pm EDT	Greg MarkenChief Accounting Officer	4,797	$8.19	$39,287	34,130	—	plan?
Apr 14, 2017 FForm 4 →	Apr 18, 6:48 pm EDT	Theodore James SandersGeneral Counsel	2,709	$8.19	$22,187	15,481	—	plan?
Apr 14, 2017 FForm 4 →	Apr 18, 6:45 pm EDT	Ron HansonSVP of Operations of ADA-ES	4,725	$8.19	$38,698	27,168	—	plan?
Mar 23, 2017 AForm 4 →	Mar 27, 7:45 pm EDT	L Heath SampsonPresident & CEO, Director	60,000	—	—	200,292	—	plan?
Mar 23, 2017 AForm 4 →	Mar 27, 7:40 pm EDT	Greg MarkenChief Accounting Officer	12,500	—	—	38,927	—	plan?
Mar 23, 2017 AForm 4 →	Mar 27, 7:37 pm EDT	Sharon SjostromChief Product Officer	10,000	—	—	76,768	—	plan?
Mar 23, 2017 AForm 4 →	Mar 27, 7:34 pm EDT	Ron HansonSVP of Operations of ADA-ES	10,000	—	—	31,893	—	plan?
Mar 23, 2017 AForm 4 →	Mar 27, 7:31 pm EDT	Theodore James SandersGeneral Counsel	10,000	—	—	18,190	—	plan?
Feb 28, 2017 FMForm 4 →	Mar 2, 6:37 pm EST	Sharon SjostromChief Product Officer	2,232	$10.77	$6,527	66,768	—	plan?
Feb 28, 2017 FMForm 4 →	Mar 2, 6:33 pm EST	L Heath SampsonPresident & CEO, Director	4,421	$10.77	$11,535	140,292	—	plan?
Jan 20, 2017 PForm 4 →	Jan 24, 8:21 pm EST	Alta Fundamental Advisers LLC +1Director	231,271	$9.00	$2,081,439	1,094,246	+26.8%	plan?
Jan 12, 2017 FForm 4 →	Jan 17, 12:58 pm EST	Greg MarkenChief Accounting Officer	1,034	$9.20	$9,513	26,427	—	plan?
Jan 2, 2017 FForm 4 →	Jan 4, 6:22 pm EST	Sharon SjostromChief Product Officer	957	$9.24	$8,843	65,748	—	plan?
Jan 2, 2017 FForm 4 →	Jan 4, 6:20 pm EST	Ron HansonSVP of Operations of ADA-ES	41	$9.24	$379	21,893	—	plan?
Jan 2, 2017 FForm 4 →	Jan 4, 6:18 pm EST	L Heath SampsonPresident & CEO, Director	10,305	$9.24	$95,218	138,013	—	plan?
Oct 16, 2016 AForm 4 →	Oct 18, 6:24 pm EDT	L Heath SampsonPresident & CEO, Director	50,000	—	—	148,318	—	plan?
Aug 9, 2016 FForm 4 →	Aug 11, 6:42 pm EDT	Christine B. AmrheinOther	1,027	$7.34	$7,538	25,713	—	plan?
Jul 18, 2016 FForm 4 →	Jul 20, 7:42 pm EDT	Christine B. AmrheinGeneral Counsel	2	$6.70	$13	26,740	—	plan?
Jul 1, 2016 AForm 4 →	Jul 6, 6:23 pm EDT	Alta Fundamental Advisers SP LLC +1Director	6,212	—	—	862,975	—	plan?
Jul 1, 2016 AForm 4 →	Jul 6, 5:25 pm EDT	R Carter PateDirector	6,212	—	—	6,212	—	plan?
Jul 1, 2016 AForm 4 →	Jul 6, 5:22 pm EDT	Louis Spencer WellsDirector	6,212	—	—	12,223	—	plan?
Jul 1, 2016 AForm 4 →	Jul 6, 5:19 pm EDT	Taylor SimontonDirector	6,212	—	—	12,267	—	plan?
Jul 1, 2016 AForm 4 →	Jul 6, 5:15 pm EDT	Derek JohnsonDirector	10,353	—	—	40,544	—	plan?
Jul 1, 2016 AForm 4 →	Jul 6, 5:03 pm EDT	Alan Bradley GabbardDirector	6,212	—	—	46,138	—	plan?
May 10, 2016 AForm 4 →	May 12, 6:08 pm EDT	Sharon SjostromChief Product Officer	20,000	$7.74	$154,800	66,705	—	plan?
May 10, 2016 AForm 4 →	May 12, 6:03 pm EDT	Christine B. AmrheinGeneral Counsel	10,000	$7.74	$77,400	26,742	—	plan?
Mar 1, 2016 MForm 4 →	Mar 3, 7:41 pm EST	Christine B. AmrheinGeneral Counsel	2,608	—	—	16,742	—	plan?
Mar 1, 2016 FMForm 4 →	Mar 3, 7:33 pm EST	Jonathan R LagarenneOther	6,488	$5.25	$8,253	27,162	—	plan?
Mar 1, 2016 MForm 4 →	Mar 3, 7:24 pm EST	Sharon SjostromChief Product Officer	3,231	—	—	46,705	—	plan?
Mar 1, 2016 MForm 4 →	Mar 3, 7:14 pm EST	Graham O MattisonVP Investor Relations	2,119	—	—	15,644	—	plan?
Jan 16, 2016 FForm 4 →	Jan 19, 6:38 pm EST	Jonathan R LagarenneOther	5,137	$5.79	$29,743	23,818	—	plan?
Jan 4, 2016 AForm 4 →	Jan 6, 6:30 pm EST	L Heath SampsonPresident & CEO, Director	72,000	$7.54	$542,880	98,318	—	plan?
Jan 1, 2016 FForm 4 →	Jan 5, 8:03 pm EST	Jonathan R LagarenneExecutive Vice President	2,248	$7.07	$15,893	28,955	—	plan?
Jan 1, 2016 FForm 4 →	Jan 5, 6:55 pm EST	Sharon SjostromChief Product Officer	1,548	$7.07	$10,944	43,474	—	plan?
Jan 1, 2016 FForm 4 →	Jan 5, 6:49 pm EST	Graham O MattisonVP Investor Relations	1,115	$7.07	$7,883	13,525	—	plan?
Jan 1, 2016 FForm 4 →	Jan 5, 6:42 pm EST	Christine B. AmrheinGeneral Counsel	1,223	$7.07	$8,647	14,134	—	plan?
Aug 11, 2015 DFForm 4 →	Aug 13, 6:00 pm EDT	Christine B. AmrheinGeneral Counsel	792	$10.15	$670	30,994	—	plan?
Jul 18, 2015 FForm 4 →	Jul 21, 7:50 pm EDT	Christine B. AmrheinGeneral Counsel	132	$12.75	$1,683	15,357	—	plan?
Jul 3, 2015 AForm 4 →	Jul 7, 5:24 pm EDT	Sharon SjostromChief Product Officer	568	—	—	45,022	—	plan?
Jul 1, 2015 AForm 4 →	Jul 2, 7:58 pm EDT	Taylor SimontonDirector	3,941	—	—	6,055	—	plan?
Jul 1, 2015 AForm 4 →	Jul 2, 7:57 pm EDT	W Phillip MarcumDirector	3,941	—	—	83,083	—	plan?
Jul 1, 2015 AForm 4 →	Jul 2, 7:55 pm EDT	Kim B ClarkeDirector	3,941	—	—	9,209	—	plan?
Jul 1, 2015 AForm 4 →	Jul 2, 7:54 pm EDT	Louis Spencer WellsDirector	3,941	—	—	6,011	—	plan?
Jul 1, 2015 AForm 4 →	Jul 2, 7:53 pm EDT	Derek JohnsonDirector	3,941	—	—	30,191	—	plan?
Jul 1, 2015 AForm 4 →	Jul 2, 3:03 pm EDT	Coliseum Capital Management, LLC +5Director	3,941	—	—	2,099,345	—	plan?
Jun 12, 2015 AForm 4 →	Jun 16, 9:58 pm EDT	Alan Bradley GabbardChief Financial Officer, Director	31,138	—	—	39,926	—	plan?

Reported at this company — derivatives (options, RSUs, warrants)

Trade	Reported (ET)	Insider	Shares	Avg price	Total	Owned after	Δ stake	Flags
Sep 1, 2026 AForm 4 →	Sep 3, 5:32 pm EDT	Peter Oluoch OwinoChief Accounting Officer	61,047	—	—	61,047	—
Aug 1, 2026 AForm 4 →	Aug 4, 8:30 pm EDT	Claiborne Benson SmithGen Counsel, Corp Secretary	61,047	—	—	61,047	—
Aug 1, 2026 AForm 4 →	Aug 4, 8:29 pm EDT	Joseph M WongChief Technology Officer	61,047	—	—	61,047	—
Jul 31, 2026 AForm 4 →	Aug 4, 8:31 pm EDT	Shimon SteinmetzChief Financial Officer	243,023	—	—	93,023	—
Jul 17, 2026 ADForm 4 →	Jul 23, 5:12 pm EDT	Robert E. RasmusChief Executive Officer, Director	2,000,000	—	—	600,000	—	late
Aug 14, 2018 MForm 4 →	Aug 16, 5:31 pm EDT	L Heath SampsonPresident & CEO, Director	92,666	—	—	0	—
Mar 1, 2018 MForm 4 →	Mar 5, 6:32 pm EST	Sharon SjostromChief Product Officer	9,646	—	—	0	—
Mar 1, 2018 MForm 4 →	Mar 5, 6:10 pm EST	L Heath SampsonPresident & CEO, Director	29,166	—	—	0	—
Feb 28, 2017 MForm 4 →	Mar 2, 6:37 pm EST	Sharon SjostromChief Product Officer	5,780	—	—	0	—
Feb 28, 2017 MForm 4 →	Mar 2, 6:33 pm EST	L Heath SampsonPresident & CEO, Director	8,932	—	—	0	—
Oct 16, 2016 AForm 4 →	Oct 18, 6:24 pm EDT	L Heath SampsonPresident & CEO, Director	277,998	—	—	577,998	—
Apr 13, 2016 AForm 4 →	Apr 15, 4:41 pm EDT	W Phillip MarcumOther	24,448	—	—	24,448	—
Mar 1, 2016 MForm 4 →	Mar 3, 7:41 pm EST	Christine B. AmrheinGeneral Counsel	7,672	—	—	12,030	—
Mar 1, 2016 MForm 4 →	Mar 3, 7:33 pm EST	Jonathan R LagarenneOther	14,460	—	—	21,734	—
Mar 1, 2016 MForm 4 →	Mar 3, 7:24 pm EST	Sharon SjostromChief Product Officer	9,504	—	—	15,426	—
Mar 1, 2016 MForm 4 →	Mar 3, 7:14 pm EST	Graham O MattisonVP Investor Relations	6,232	—	—	11,744	—
Jul 3, 2015 AForm 4 →	Jul 7, 5:24 pm EDT	Sharon SjostromChief Product Officer	1,136	—	—	24,930	—
Jun 5, 2015 AForm 4 →	Jun 9, 4:44 pm EDT	L Heath SampsonPresident & CEO, Director	300,000	—	—	300,000	—
Mar 3, 2015 AForm 4 →	Mar 5, 8:31 pm EST	L Heath SampsonChief Financial Officer	29,166	—	—	38,098	—
Mar 3, 2015 AForm 4 →	Mar 5, 8:23 pm EST	Jonathan R LagarenneExecutive Vice President	12,942	—	—	36,194	—
Mar 3, 2015 AForm 4 →	Mar 5, 8:07 pm EST	Michael D DurhamPresident and CEO, Director	72,156	—	—	201,768	—
Mar 3, 2015 AForm 4 →	Mar 5, 7:58 pm EST	Sharon SjostromChief Technology Officer	8,510	—	—	23,794	—
Mar 3, 2015 AForm 4 →	Mar 5, 7:52 pm EST	Graham O MattisonVP Strategic Initiatives & IR	7,276	—	—	17,976	—
Mar 3, 2015 AForm 4 →	Mar 5, 7:44 pm EST	Christine B. AmrheinGeneral Counsel	7,250	—	—	19,702	—
Aug 22, 2014 MForm 4/A →	Feb 17, 2015, 4:37 pm EST	Michael D DurhamPresident and CEO, Director	98,020	—	—	0	—