Company · CIK 0001262823 · SIC 2860 — Industrial Organic Chemicals · NYSE

WESTLAKE CORP · WLK

Insider activity reported against this company. All insider holders · Files at: WLKP. On EDGAR ↗

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

Open-market activity at this companybuys $0 · 0sales $75.7M · 53net −$75.7M

Reported at this company — common stock

Trade	Reported (ET)	Insider	Shares	Avg price	Total	Owned after	Δ stake	Flags
Aug 11, 2026 SForm 4 →	Aug 11, 5:45 pm EDT	Albert ChaoExecutive Chairman, Director	38,873	$80.28	$3,120,775	642,880	−5.70%
Aug 11, 2026 MForm 4 →	Aug 11, 5:45 pm EDT	Albert ChaoExecutive Chairman, Director	38,873	$61.87	$2,404,878	681,753	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:54 pm EDT	Jeffrey Wayne SheetsDirector	2,168	—	—	14,927	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:53 pm EDT	Carolyn Chao SabatDirector	2,168	—	—	5,748	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:53 pm EDT	R Bruce NorthcuttDirector	2,168	—	—	23,351	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:52 pm EDT	Mark A McCollumDirector	2,168	—	—	11,824	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:52 pm EDT	Kimberly S LubelDirector	2,168	—	—	13,821	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:51 pm EDT	Michael J GraffDirector	2,168	—	—	23,310	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:51 pm EDT	Roger A CreggDirector	2,168	—	—	3,507	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:50 pm EDT	David Tsung-Hung ChaoDirector	2,168	—	—	11,080	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:50 pm EDT	Catherine T. ChaoDirector	2,168	—	—	7,748	—
Feb 18, 2019 FMForm 4 →	Feb 20, 1:52 pm EST	Lawrence E. TeelEVP, Olefins	3,998	$73.51	$63,292	4,398	—	plan?
Feb 18, 2019 FMForm 4 →	Feb 20, 1:51 pm EST	George J MangieriSVP & Chief Accounting Officer	1,877	$73.48	$32,039	3,165	—	plan?
Feb 18, 2019 FMForm 4 →	Feb 20, 1:50 pm EST	Andrew KennerSVP - Chemical Manufacturing	3,637	$73.49	$58,275	13,488	—	plan?
Feb 18, 2019 MForm 4 →	Feb 20, 1:49 pm EST	L. Benjamin EderingtonSVP, GC, CAO and Secretary	3,302	—	—	15,347	—	plan?
Feb 18, 2019 FMForm 4 →	Feb 20, 1:47 pm EST	James ChaoChairman, Director, 10% Owner	22,477	$73.49	$391,199	63,323	—	plan?
Feb 18, 2019 FMForm 4 →	Feb 20, 1:46 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	28,623	$73.51	$526,971	338,939	—	plan?
Feb 18, 2019 FMForm 4 →	Feb 20, 1:45 pm EST	Robert F. BuesingerEVP, Vinyl Products	4,509	$73.49	$71,282	5,211	—	plan?
Feb 18, 2019 FMForm 4 →	Feb 20, 1:44 pm EST	Mark Steven BenderEVP and CFO	8,328	$73.51	$129,523	20,614	—	plan?
Jan 5, 2019 MForm 4 →	Jan 7, 3:08 pm EST	Jeffrey Wayne SheetsDirector	1,090	—	—	1,090	—	plan?
Jan 5, 2019 MForm 4 →	Jan 7, 3:07 pm EST	Marius HaasDirector	1,090	—	—	1,090	—	plan?
Jan 5, 2019 MForm 4 →	Jan 7, 3:07 pm EST	David Tsung-Hung ChaoDirector, 10% Owner	1,090	—	—	1,743	—	plan?
Nov 16, 2018 SForm 4 →	Nov 19, 9:29 am EST	Albert ChaoPresident & CEO, Director, 10% Owner	24,509	$71.75	$1,758,608	324,654	−7.02%	plan?
Nov 16, 2018 MForm 4 →	Nov 19, 9:29 am EST	Albert ChaoPresident & CEO, Director, 10% Owner	30,640	$7.12	$218,157	349,163	—	plan?
Nov 14, 2018 SForm 4 →	Nov 16, 1:06 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	49,130	$71.31	$3,503,643	318,523	−13.4%	plan?
Nov 14, 2018 MForm 4 →	Nov 16, 1:06 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	61,279	$7.12	$436,306	343,032	—	plan?
Nov 12, 2018 SForm 4 →	Nov 14, 1:14 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	40,000	$73.47	$2,938,808	306,374	−11.5%	plan?
Nov 12, 2018 MForm 4 →	Nov 14, 1:14 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	63,973	$7.12	$455,488	321,374	—	plan?
Aug 21, 2018 MForm 4 →	Aug 22, 9:32 am EDT	H John Riley Jr.Director	603	—	—	25,979	—	plan?
Aug 21, 2018 MForm 4 →	Aug 22, 9:31 am EDT	R Bruce NorthcuttDirector	603	—	—	8,367	—	plan?
Aug 21, 2018 MForm 4 →	Aug 22, 9:30 am EDT	Max L LukensDirector	603	—	—	6,607	—	plan?
Aug 21, 2018 MForm 4 →	Aug 22, 9:30 am EDT	Michael J GraffDirector	603	—	—	8,367	—	plan?
Aug 21, 2018 MForm 4 →	Aug 22, 9:29 am EDT	Robert T BlakelyDirector	603	—	—	10,989	—	plan?
Aug 21, 2018 MForm 4 →	Aug 22, 9:28 am EDT	Dorothy C JenkinsDirector, 10% Owner	603	—	—	58,005	—	plan?
Aug 17, 2018 MForm 4 →	Aug 20, 11:36 am EDT	H John Riley Jr.Director	2,724	—	—	25,376	—	plan?
Aug 17, 2018 MForm 4 →	Aug 20, 10:53 am EDT	R Bruce NorthcuttDirector	2,724	—	—	7,764	—	plan?
Aug 17, 2018 MForm 4 →	Aug 20, 10:52 am EDT	Max L LukensDirector	2,724	—	—	6,004	—	plan?
Aug 17, 2018 MForm 4 →	Aug 20, 10:50 am EDT	Dorothy C JenkinsDirector, 10% Owner	2,724	—	—	57,402	—	plan?
Aug 17, 2018 MForm 4 →	Aug 20, 10:49 am EDT	Michael J GraffDirector	2,724	—	—	7,764	—	plan?
Aug 17, 2018 MForm 4 →	Aug 20, 10:48 am EDT	Robert T BlakelyDirector	2,724	—	—	10,386	—	plan?
May 24, 2018 SForm 4 →	May 25, 9:45 am EDT	James ChaoChairman, Director, 10% Owner	33,305	$120.69	$4,019,580	51,492	−39.3%	plan?
May 21, 2018 SForm 4 →	May 22, 12:18 pm EDT	Mark Steven BenderEVP and CFO	12,066	$122.83	$1,482,122	15,810	−43.3%	plan?
May 21, 2018 MForm 4 →	May 22, 12:18 pm EDT	Mark Steven BenderEVP and CFO	12,066	$68.09	$821,574	27,876	—	plan?
May 15, 2018 SForm 4 →	May 16, 2:16 pm EDT	Robert F. BuesingerEVP, Vinyl Products	1,447	$118.88	$172,012	2,642	−35.4%	plan?
May 11, 2018 SForm 4 →	May 14, 9:38 am EDT	Mark Steven BenderEVP and CFO	23,506	$117.33	$2,757,959	15,810	−59.8%	plan?
May 11, 2018 MForm 4 →	May 14, 9:38 am EDT	Mark Steven BenderEVP and CFO	23,506	$28.02	$658,736	39,316	—	plan?
May 10, 2018 SForm 4 →	May 11, 3:33 pm EDT	Dorothy C JenkinsDirector, 10% Owner	52	$117.01	$6,085	54,678	−0.10%	plan?
May 10, 2018 MForm 4 →	May 11, 3:33 pm EDT	Dorothy C JenkinsDirector, 10% Owner	7,652	$10.41	$79,676	54,730	—	plan?
Mar 9, 2018 SForm 4 →	Mar 12, 12:13 pm EDT	Andrew KennerSVP - Chemical Manufacturing	6,028	$120.00	$723,360	11,437	−34.5%	plan?
Mar 9, 2018 MForm 4 →	Mar 12, 12:13 pm EDT	Andrew KennerSVP - Chemical Manufacturing	3,412	$61.87	$211,083	17,465	—	plan?
Mar 5, 2018 SForm 4 →	Mar 6, 2:50 pm EST	Robert F. BuesingerEVP, Vinyl Products	19,349	$113.04	$2,187,203	4,089	−82.6%	plan?
Mar 5, 2018 MForm 4 →	Mar 6, 2:50 pm EST	Robert F. BuesingerEVP, Vinyl Products	15,315	$59.49	$911,037	23,438	—	plan?
Mar 5, 2018 SForm 4 →	Mar 6, 2:49 pm EST	George J MangieriSVP & Chief Accounting Officer	2,161	$113.41	$245,079	2,160	−50.0%	plan?
Mar 5, 2018 SForm 4 →	Mar 6, 2:48 pm EST	Andrew KennerSVP - Chemical Manufacturing	24,318	$110.61	$2,689,814	14,053	−63.4%	plan?
Mar 5, 2018 MForm 4 →	Mar 6, 2:48 pm EST	Andrew KennerSVP - Chemical Manufacturing	24,318	$54.77	$1,331,968	38,371	—	plan?
Feb 28, 2018 SForm 4 →	Mar 1, 12:47 pm EST	George J MangieriSVP & Chief Accounting Officer	4,335	$111.22	$482,139	4,321	−50.1%	plan?
Feb 28, 2018 MForm 4 →	Mar 1, 12:47 pm EST	George J MangieriSVP & Chief Accounting Officer	4,335	$56.07	$243,058	8,656	—	plan?
Feb 27, 2018 SForm 4 →	Feb 28, 11:36 am EST	Robert T BlakelyDirector	4,038	$111.00	$448,218	7,662	−34.5%	plan?
Feb 26, 2018 SForm 4 →	Feb 27, 11:24 am EST	Lawrence E. TeelEVP, Olefins	9,351	$111.86	$1,046,003	2,122	−81.5%	plan?
Feb 26, 2018 MForm 4 →	Feb 27, 11:24 am EST	Lawrence E. TeelEVP, Olefins	9,351	$55.84	$522,186	11,473	—	plan?
Feb 26, 2018 SForm 4 →	Feb 27, 11:23 am EST	Mark Steven BenderEVP and CFO	5,000	$111.69	$558,470	15,810	−24.0%	plan?
Feb 22, 2018 SForm 4 →	Feb 26, 11:54 am EST	Mark Steven BenderEVP and CFO	2,000	$110.64	$221,270	20,810	−8.77%	plan?
Feb 22, 2018 SForm 4 →	Feb 23, 12:54 pm EST	Max L LukensDirector	17,558	$110.93	$1,947,757	3,280	−84.3%	plan?
Feb 22, 2018 SForm 4 →	Feb 23, 12:49 pm EST	L. Benjamin EderingtonSVP, GC, CAO and Secretary	6,942	$111.45	$773,665	12,045	−36.6%	plan?
Feb 22, 2018 MForm 4 →	Feb 23, 12:49 pm EST	L. Benjamin EderingtonSVP, GC, CAO and Secretary	6,942	$67.46	$468,297	18,987	—	plan?
Feb 22, 2018 SForm 4 →	Feb 23, 12:45 pm EST	Mark Steven BenderEVP and CFO	4,000	$110.97	$443,880	22,810	−14.9%	plan?
Feb 20, 2018 MForm 4 →	Feb 22, 9:31 am EST	L. Benjamin EderingtonSVP, GC, CAO and Secretary	1,762	—	—	12,045	—	plan?
Feb 20, 2018 FMForm 4 →	Feb 22, 9:30 am EST	Albert ChaoPresident & CEO, Director, 10% Owner	18,787	$106.98	$556,510	282,401	—	plan?
Feb 20, 2018 FMForm 4 →	Feb 22, 9:29 am EST	Andrew KennerSVP - Chemical Manufacturing	2,258	$106.98	$48,783	14,053	—	plan?
Feb 20, 2018 FMForm 4 →	Feb 22, 9:29 am EST	Lawrence E. TeelEVP, Olefins	2,206	$106.98	$47,499	2,122	—	plan?
Feb 20, 2018 FMForm 4 →	Feb 22, 9:28 am EST	Mark Steven BenderEVP and CFO	4,495	$106.98	$93,714	26,810	—	plan?
Feb 20, 2018 FMForm 4 →	Feb 22, 9:27 am EST	James ChaoChairman, Director, 10% Owner	15,040	$106.98	$446,321	84,797	—	plan?
Feb 20, 2018 FMForm 4 →	Feb 22, 9:27 am EST	George J MangieriSVP & Chief Accounting Officer	1,167	$106.98	$27,173	4,321	—	plan?
Feb 20, 2018 FMForm 4 →	Feb 22, 9:26 am EST	Robert F. BuesingerEVP, Vinyl Products	2,476	$106.98	$52,848	8,123	—	plan?
Dec 4, 2017 GForm 4 →	Dec 6, 8:27 am EST	James ChaoChairman, Director, 10% Owner	15,000	—	—	93,969	—	plan?
Dec 4, 2017 SForm 4 →	Dec 5, 1:08 pm EST	Mark Steven BenderEVP and CFO	6,500	$97.83	$635,902	24,067	−21.3%	plan?
Dec 4, 2017 MForm 4 →	Dec 5, 1:08 pm EST	Mark Steven BenderEVP and CFO	6,500	$22.92	$148,948	30,567	—	plan?
Dec 1, 2017 GForm 4/A →	Dec 4, 3:43 pm EST	James ChaoChairman, Director, 10% Owner	10,000	—	—	108,969	—	plan?
Dec 1, 2017 SForm 4 →	Dec 4, 9:58 am EST	Robert F. BuesingerEVP, Vinyls Products	2,674	$98.50	$263,389	6,635	−28.7%	plan?
Nov 29, 2017 GForm 4 →	Nov 29, 2:56 pm EST	James ChaoChairman, Director, 10% Owner	10,000	—	—	108,969	—	plan?
Nov 28, 2017 SForm 4 →	Nov 30, 12:49 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	41,844	$94.84	$3,968,421	274,018	−13.2%	plan?
Nov 28, 2017 MForm 4 →	Nov 30, 12:49 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	41,844	$9.65	$403,585	290,862	—	plan?
Nov 27, 2017 SForm 4 →	Nov 28, 10:53 am EST	Albert ChaoPresident & CEO, Director, 10% Owner	25,000	$93.96	$2,349,055	274,018	−8.36%	plan?
Nov 27, 2017 MForm 4 →	Nov 28, 10:53 am EST	Albert ChaoPresident & CEO, Director, 10% Owner	25,000	$9.65	$241,125	299,018	—	plan?
Nov 22, 2017 SForm 4 →	Nov 27, 12:40 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	45,000	$94.76	$4,264,077	274,018	−14.1%	plan?
Nov 22, 2017 MForm 4 →	Nov 27, 12:40 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	45,000	$9.65	$434,025	294,018	—	plan?
Nov 22, 2017 SForm 4 →	Nov 27, 12:33 pm EST	James ChaoChairman, Director, 10% Owner	76,135	$94.69	$7,209,193	118,969	−39.0%	plan?
Nov 22, 2017 MForm 4 →	Nov 27, 12:33 pm EST	James ChaoChairman, Director, 10% Owner	76,135	$60.42	$4,599,701	184,995	—	plan?
Nov 21, 2017 SForm 4 →	Nov 22, 11:10 am EST	Albert ChaoPresident & CEO, Director, 10% Owner	25,000	$94.34	$2,358,375	274,018	−8.36%	plan?
Nov 21, 2017 MForm 4 →	Nov 22, 11:10 am EST	Albert ChaoPresident & CEO, Director, 10% Owner	25,000	$9.65	$241,125	299,018	—	plan?
Nov 21, 2017 SForm 4 →	Nov 22, 10:50 am EST	Mark Steven BenderEVP and CFO	20,382	$94.27	$1,921,309	24,067	−45.9%	plan?
Nov 17, 2017 SForm 4 →	Nov 20, 9:45 am EST	Robert F. BuesingerEVP, Vinyls Products	5,214	$93.82	$489,199	9,309	−35.9%	plan?
Nov 17, 2017 MForm 4 →	Nov 20, 9:45 am EST	Robert F. BuesingerEVP, Vinyls Products	5,214	$63.98	$333,579	14,523	—	plan?
Nov 14, 2017 SForm 4 →	Nov 15, 10:11 am EST	Robert T BlakelyDirector	4,367	$92.33	$403,190	11,700	−27.2%	plan?
Nov 13, 2017 SForm 4 →	Nov 15, 10:25 am EST	Mark Steven BenderEVP and CFO	29,804	$94.02	$2,802,082	44,449	−40.1%	plan?
Nov 13, 2017 MForm 4 →	Nov 15, 10:25 am EST	Mark Steven BenderEVP and CFO	29,804	$10.26	$305,864	74,253	—	plan?
Nov 13, 2017 SForm 4 →	Nov 15, 10:08 am EST	Lawrence E. TeelEVP, Olefins	12,712	$93.99	$1,194,765	804	−94.1%	plan?
Nov 13, 2017 MForm 4 →	Nov 15, 10:08 am EST	Lawrence E. TeelEVP, Olefins	11,912	$57.79	$688,452	13,516	—	plan?
Nov 13, 2017 SForm 4 →	Nov 15, 9:48 am EST	George J MangieriSVP & Chief Accounting Officer	13,381	$94.44	$1,263,766	3,662	−78.5%	plan?
Nov 13, 2017 MForm 4 →	Nov 15, 9:48 am EST	George J MangieriSVP & Chief Accounting Officer	10,466	$55.07	$576,319	17,043	—	plan?

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

Trade	Reported (ET)	Insider	Shares	Avg price	Total	Owned after	Δ stake
Aug 31, 2026 AForm 4 →	Sep 1, 7:14 am EDT	Tommy DarbyVP and CAO	1,791	—	—	1,791	—
Aug 14, 2026 AForm 4 →	Aug 17, 12:28 pm EDT	Jeffrey Wayne SheetsDirector	2,184	—	—	2,184	—
Aug 14, 2026 AForm 4 →	Aug 17, 12:28 pm EDT	Carolyn Chao SabatDirector	2,184	—	—	2,184	—
Aug 14, 2026 AForm 4 →	Aug 17, 12:27 pm EDT	Bhavesh V. PatelDirector	2,184	—	—	2,184	—
Aug 14, 2026 AForm 4 →	Aug 17, 12:27 pm EDT	R Bruce NorthcuttDirector	2,184	—	—	2,184	—
Aug 14, 2026 AForm 4 →	Aug 17, 12:27 pm EDT	Mark A McCollumDirector	2,184	—	—	2,184	—
Aug 14, 2026 AForm 4 →	Aug 17, 12:26 pm EDT	Kimberly S LubelDirector	2,184	—	—	2,184	—
Aug 14, 2026 AForm 4 →	Aug 17, 12:26 pm EDT	Michael J GraffDirector	2,184	—	—	2,184	—
Aug 14, 2026 AForm 4 →	Aug 17, 12:25 pm EDT	Roger A CreggDirector	2,184	—	—	2,184	—
Aug 14, 2026 AForm 4 →	Aug 17, 12:25 pm EDT	David Tsung-Hung ChaoDirector	2,184	—	—	2,184	—
Aug 14, 2026 AForm 4 →	Aug 17, 12:25 pm EDT	Catherine T. ChaoDirector	2,184	—	—	2,184	—
Aug 11, 2026 MForm 4 →	Aug 11, 5:45 pm EDT	Albert ChaoExecutive Chairman, Director	38,873	—	—	38,873	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:54 pm EDT	Jeffrey Wayne SheetsDirector	2,168	—	—	2,168	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:53 pm EDT	Carolyn Chao SabatDirector	2,168	—	—	2,168	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:53 pm EDT	R Bruce NorthcuttDirector	2,168	—	—	2,168	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:52 pm EDT	Mark A McCollumDirector	2,168	—	—	2,168	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:52 pm EDT	Kimberly S LubelDirector	2,168	—	—	2,168	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:51 pm EDT	Michael J GraffDirector	2,168	—	—	2,168	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:51 pm EDT	Roger A CreggDirector	2,168	—	—	2,168	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:50 pm EDT	David Tsung-Hung ChaoDirector	2,168	—	—	2,168	—
Aug 8, 2026 MForm 4 →	Aug 10, 1:50 pm EDT	Catherine T. ChaoDirector	2,168	—	—	2,168	—
Jun 15, 2026 AForm 4 →	Jun 16, 11:25 am EDT	Jonathan BakshtSVP and CFO	20,580	—	—	20,580	—
Feb 18, 2019 MForm 4 →	Feb 20, 1:52 pm EST	Lawrence E. TeelEVP, Olefins	3,137	—	—	0	—
Feb 18, 2019 MForm 4 →	Feb 20, 1:51 pm EST	George J MangieriSVP & Chief Accounting Officer	1,441	—	—	0	—
Feb 18, 2019 MForm 4 →	Feb 20, 1:50 pm EST	Andrew KennerSVP - Chemical Manufacturing	2,844	—	—	0	—
Feb 18, 2019 MForm 4 →	Feb 20, 1:49 pm EST	L. Benjamin EderingtonSVP, GC, CAO and Secretary	3,302	—	—	0	—
Feb 18, 2019 MForm 4 →	Feb 20, 1:47 pm EST	James ChaoChairman, Director, 10% Owner	17,154	—	—	0	—
Feb 18, 2019 MForm 4 →	Feb 20, 1:46 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	21,454	—	—	0	—
Feb 18, 2019 MForm 4 →	Feb 20, 1:45 pm EST	Robert F. BuesingerEVP, Vinyl Products	3,539	—	—	0	—
Feb 18, 2019 MForm 4 →	Feb 20, 1:44 pm EST	Mark Steven BenderEVP and CFO	6,566	—	—	0	—
Feb 15, 2019 AForm 4 →	Feb 19, 12:49 pm EST	Andrew KennerSVP - Chemical Manufacturing	13,719	—	—	2,859	—
Feb 15, 2019 AForm 4 →	Feb 19, 12:48 pm EST	Robert F. BuesingerEVP, Vinyl Products	18,563	—	—	3,869	—
Feb 15, 2019 AForm 4 →	Feb 19, 12:48 pm EST	Mark Steven BenderEVP and CFO	22,816	—	—	4,755	—
Feb 15, 2019 AForm 4 →	Feb 19, 12:47 pm EST	L. Benjamin EderingtonSVP, GC, CAO and Secretary	18,213	—	—	3,796	—
Feb 15, 2019 AForm 4 →	Feb 19, 12:46 pm EST	Lawrence E. TeelEVP, Olefins	18,563	—	—	3,869	—
Feb 15, 2019 AForm 4 →	Feb 19, 12:45 pm EST	James ChaoChairman, Director, 10% Owner	70,449	—	—	14,683	—
Feb 15, 2019 AForm 4 →	Feb 19, 12:44 pm EST	George J MangieriSVP & Chief Accounting Officer	5,329	—	—	1,111	—
Feb 15, 2019 AForm 4 →	Feb 19, 12:42 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	88,062	—	—	18,354	—
Feb 15, 2019 AForm 4 →	Feb 19, 12:41 pm EST	Roger L. KearnsEVP, Vinyls Chemicals	15,815	—	—	3,296	—
Jan 5, 2019 MForm 4 →	Jan 7, 3:08 pm EST	Jeffrey Wayne SheetsDirector	1,090	—	—	0	—
Jan 5, 2019 MForm 4 →	Jan 7, 3:07 pm EST	Marius HaasDirector	1,090	—	—	0	—
Jan 5, 2019 MForm 4 →	Jan 7, 3:07 pm EST	David Tsung-Hung ChaoDirector, 10% Owner	1,090	—	—	0	—
Nov 16, 2018 MForm 4 →	Nov 19, 9:29 am EST	Albert ChaoPresident & CEO, Director, 10% Owner	30,640	—	—	0	—
Nov 14, 2018 MForm 4 →	Nov 16, 1:06 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	61,279	—	—	30,640	—
Nov 12, 2018 MForm 4 →	Nov 14, 1:14 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	63,973	—	—	91,919	—
Aug 21, 2018 MForm 4 →	Aug 22, 9:32 am EDT	H John Riley Jr.Director	603	—	—	0	—
Aug 21, 2018 MForm 4 →	Aug 22, 9:31 am EDT	R Bruce NorthcuttDirector	603	—	—	0	—
Aug 21, 2018 MForm 4 →	Aug 22, 9:30 am EDT	Max L LukensDirector	603	—	—	0	—
Aug 21, 2018 MForm 4 →	Aug 22, 9:30 am EDT	Michael J GraffDirector	603	—	—	0	—
Aug 21, 2018 MForm 4 →	Aug 22, 9:29 am EDT	Robert T BlakelyDirector	603	—	—	0	—
Aug 21, 2018 MForm 4 →	Aug 22, 9:28 am EDT	Dorothy C JenkinsDirector, 10% Owner	603	—	—	0	—
Aug 17, 2018 AMForm 4 →	Aug 20, 11:36 am EDT	H John Riley Jr.Director	4,133	—	—	0	—
Aug 17, 2018 AForm 4 →	Aug 20, 10:54 am EDT	Jeffrey Wayne SheetsDirector	1,409	—	—	1,409	—
Aug 17, 2018 AMForm 4 →	Aug 20, 10:53 am EDT	R Bruce NorthcuttDirector	4,133	—	—	0	—
Aug 17, 2018 AForm 4 →	Aug 20, 10:52 am EDT	Mark A McCollumDirector	1,409	—	—	1,409	—
Aug 17, 2018 AMForm 4 →	Aug 20, 10:52 am EDT	Max L LukensDirector	4,133	—	—	0	—
Aug 17, 2018 AMForm 4 →	Aug 20, 10:50 am EDT	Dorothy C JenkinsDirector, 10% Owner	4,133	—	—	0	—
Aug 17, 2018 AForm 4 →	Aug 20, 10:50 am EDT	Marius HaasDirector	1,409	—	—	1,409	—
Aug 17, 2018 AMForm 4 →	Aug 20, 10:49 am EDT	Michael J GraffDirector	4,133	—	—	0	—
Aug 17, 2018 AForm 4 →	Aug 20, 10:49 am EDT	David Tsung-Hung ChaoDirector, 10% Owner	1,409	—	—	1,409	—
Aug 17, 2018 AMForm 4 →	Aug 20, 10:48 am EDT	Robert T BlakelyDirector	4,133	—	—	0	—
Aug 17, 2018 AForm 4 →	Aug 20, 10:35 am EDT	John Tsung-chen ChaoDirector, 10% Owner	1,409	—	—	1,409	—
May 21, 2018 MForm 4 →	May 22, 12:18 pm EDT	Mark Steven BenderEVP and CFO	12,066	—	—	0	—
May 18, 2018 AForm 4 →	May 21, 9:57 am EDT	Mark A McCollumDirector	987	—	—	987	—
May 18, 2018 AForm 4 →	May 21, 9:56 am EDT	H John Riley Jr.Director	144	—	—	144	—
May 18, 2018 AForm 4 →	May 21, 9:56 am EDT	R Bruce NorthcuttDirector	144	—	—	144	—
May 18, 2018 AForm 4 →	May 21, 9:55 am EDT	Max L LukensDirector	103	—	—	103	—
May 18, 2018 AForm 4 →	May 21, 9:55 am EDT	Dorothy C JenkinsDirector, 10% Owner	103	—	—	103	—
May 18, 2018 AForm 4 →	May 21, 9:54 am EDT	Michael J GraffDirector	103	—	—	103	—
May 18, 2018 AForm 4 →	May 21, 9:54 am EDT	Robert T BlakelyDirector	103	—	—	103	—
May 11, 2018 MForm 4 →	May 14, 9:38 am EDT	Mark Steven BenderEVP and CFO	23,506	—	—	0	—
May 10, 2018 MForm 4 →	May 11, 3:33 pm EDT	Dorothy C JenkinsDirector, 10% Owner	7,652	—	—	0	—
Apr 30, 2018 AForm 4 →	May 1, 11:21 am EDT	Roger L. KearnsEVP, Vinyls Chemicals	18,448	—	—	18,448	—
Mar 9, 2018 MForm 4 →	Mar 12, 12:13 pm EDT	Andrew KennerSVP - Chemical Manufacturing	3,412	—	—	6,928	—
Mar 5, 2018 MForm 4 →	Mar 6, 2:50 pm EST	Robert F. BuesingerEVP, Vinyl Products	15,315	—	—	8,652	—
Mar 5, 2018 MForm 4 →	Mar 6, 2:48 pm EST	Andrew KennerSVP - Chemical Manufacturing	24,318	—	—	3,682	—
Feb 28, 2018 MForm 4 →	Mar 1, 12:47 pm EST	George J MangieriSVP & Chief Accounting Officer	4,335	—	—	0	—
Feb 26, 2018 MForm 4 →	Feb 27, 11:24 am EST	Lawrence E. TeelEVP, Olefins	9,351	—	—	4,060	—
Feb 22, 2018 MForm 4 →	Feb 23, 12:49 pm EST	L. Benjamin EderingtonSVP, GC, CAO and Secretary	6,942	—	—	0	—
Feb 20, 2018 MForm 4 →	Feb 22, 9:31 am EST	L. Benjamin EderingtonSVP, GC, CAO and Secretary	1,762	—	—	0	—
Feb 20, 2018 MForm 4 →	Feb 22, 9:30 am EST	Albert ChaoPresident & CEO, Director, 10% Owner	13,585	—	—	0	—
Feb 20, 2018 MForm 4 →	Feb 22, 9:29 am EST	Andrew KennerSVP - Chemical Manufacturing	1,802	—	—	0	—
Feb 20, 2018 MForm 4 →	Feb 22, 9:29 am EST	Lawrence E. TeelEVP, Olefins	1,762	—	—	0	—
Feb 20, 2018 MForm 4 →	Feb 22, 9:28 am EST	Mark Steven BenderEVP and CFO	3,619	—	—	0	—
Feb 20, 2018 MForm 4 →	Feb 22, 9:27 am EST	James ChaoChairman, Director, 10% Owner	10,868	—	—	0	—
Feb 20, 2018 MForm 4 →	Feb 22, 9:27 am EST	George J MangieriSVP & Chief Accounting Officer	913	—	—	0	—
Feb 20, 2018 MForm 4 →	Feb 22, 9:26 am EST	Robert F. BuesingerEVP, Vinyl Products	1,982	—	—	0	—
Feb 16, 2018 AForm 4 →	Feb 20, 2:04 pm EST	George J MangieriSVP & Chief Accounting Officer	3,275	—	—	693	—
Feb 16, 2018 AForm 4 →	Feb 20, 2:03 pm EST	Andrew KennerSVP - Chemical Manufacturing	9,092	—	—	1,924	—
Feb 16, 2018 AForm 4 →	Feb 20, 2:02 pm EST	Lawrence E. TeelEVP, Olefins	10,845	—	—	2,295	—
Feb 16, 2018 AForm 4 →	Feb 20, 2:01 pm EST	L. Benjamin EderingtonSVP, GC, CAO and Secretary	11,681	—	—	2,472	—
Feb 16, 2018 AForm 4 →	Feb 20, 2:00 pm EST	Robert F. BuesingerEVP, Vinyl Products	12,140	—	—	2,569	—
Feb 16, 2018 AForm 4 →	Feb 20, 1:59 pm EST	Mark Steven BenderEVP and CFO	15,263	—	—	3,230	—
Feb 16, 2018 AForm 4 →	Feb 20, 1:57 pm EST	James ChaoChairman, Director, 10% Owner	44,801	—	—	9,480	—
Feb 16, 2018 AForm 4 →	Feb 20, 1:56 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	56,630	—	—	11,983	—
Jan 5, 2018 AForm 4 →	Jan 9, 9:00 am EST	Marius HaasDirector	1,090	—	—	1,090	—
Jan 5, 2018 AForm 4 →	Jan 9, 8:59 am EST	Jeffrey Wayne SheetsDirector	1,090	—	—	1,090	—
Jan 5, 2018 AForm 4 →	Jan 9, 8:57 am EST	David Tsung-Hung ChaoDirector, 10% Owner	1,090	—	—	1,090	—
Dec 4, 2017 MForm 4 →	Dec 5, 1:08 pm EST	Mark Steven BenderEVP and CFO	6,500	—	—	6,680	—
Nov 28, 2017 MForm 4 →	Nov 30, 12:49 pm EST	Albert ChaoPresident & CEO, Director, 10% Owner	41,844	—	—	0	—

Filed by this entity as an insider elsewhere — common stock

No reported common-stock activity in this period.

Filed by this entity as an insider elsewhere — derivatives (options, RSUs, warrants)

No reported derivative activity in this period.