Michael J. Mattina

Insider

First SEC filing: April 13, 2015 · Latest: April 13, 2015

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Insider at

0 buys (P) 0 sells (S) Net: $0 + 15 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

15 other filings hidden

Date	Ticker	Code	Shares	Price	Value	Owned after	Δ own	A/D	vs now
Feb. 15, 2017	WLK	F	217	$64.01	$13,890	6,506 Direct	-3.23%	Disposed	23.3% (price as of 2026-08-20)
Feb. 14, 2017	WLK	M	660	—	—	6,723 Direct	+10.89%	Acquired	(price as of 2026-08-20)
Feb. 14, 2017	WLK	M	660	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 15, 2016	WLK	M	1,582	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 15, 2016	WLK	M	1,334	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 15, 2016	WLK	M	15,358	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Nov. 15, 2016	WLK	S	18,274	$53.78	$982,776	6,063 Direct	-75.09%	Disposed	46.8% (price as of 2026-08-20)
Nov. 15, 2016	WLK	M	1,582	$45.70	$72,297	24,337 Direct	+6.95%	Acquired	72.7% (price as of 2026-08-20)
Nov. 15, 2016	WLK	M	1,334	$30.05	$40,087	22,755 Direct	+6.23%	Acquired	162.7% (price as of 2026-08-20)
Nov. 15, 2016	WLK	M	15,358	$15.80	$242,656	21,421 Direct	+253.31%	Acquired	399.7% (price as of 2026-08-20)
Aug. 24, 2016	WLK	F	2,443	$51.93	$126,865	6,063 Direct	-28.72%	Disposed	52.0% (price as of 2026-08-20)
Feb. 18, 2016	WLK	A	2,296	—	—	2,296 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 18, 2016	WLK	A	8,741	—	—	8,741 Direct	—	Acquired	(price as of 2026-08-20)
Feb. 17, 2016	WLK	F	296	$43.52	$12,882	8,506 Direct	-3.36%	Disposed	81.4% (price as of 2026-08-20)
Feb. 15, 2016	WLK	M	892	—	—	0 Direct	-100.00%	Disposed	(price as of 2026-08-20)
Feb. 15, 2016	WLK	M	892	—	—	8,802 Direct	+11.28%	Acquired	(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.

Options, RSUs and convertible securities reported on Form 4 Table II.

Date	Ticker	Security	Underlying	Exercise price	Expiration	Shares	A/D
Feb. 14, 2017	WLK	Restricted Stock Units	Common Stock (660)	—	—	660	Disposed
Nov. 15, 2016	WLK	Employee Option (right to buy)	Common Stock (1,582)	$45.70	Feb. 15, 2023	1,582	Disposed
Nov. 15, 2016	WLK	Employee Option (right to buy)	Common Stock (1,334)	$30.05	Feb. 17, 2022	1,334	Disposed
Nov. 15, 2016	WLK	Employee Option (right to buy)	Common Stock (15,358)	$15.80	Feb. 23, 2017	15,358	Disposed
Feb. 18, 2016	WLK	Restricted Stock Units	Common Stock (2,296)	—	—	2,296	Acquired
Feb. 18, 2016	WLK	Employee Option (right to buy)	Common Stock (8,741)	$44.42	Feb. 18, 2026	8,741	Acquired
Feb. 15, 2016	WLK	Restricted Stock Units	Common Stock (892)	—	—	892	Disposed

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

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

Date	Ticker	Security	Shares	Ownership
April 13, 2015	WLK	Common Stock	7,910	Direct
April 13, 2015	WLK	Restricted Stock Units→ Common Stock (892)	892	Direct
April 13, 2015	WLK	Restricted Stock Units→ Common Stock (660)	660	Direct
April 13, 2015	WLK	Restricted Stock Units→ Common Stock (644)	644	Direct
April 13, 2015	WLK	Employee Option (Right to Buy)→ Common Stock (1,334)	1,334	Direct
April 13, 2015	WLK	Employee Option (Right to Buy)→ Common Stock (1,582)	1,582	Direct
April 13, 2015	WLK	Employee Option (Right to Buy)→ Common Stock (2,054)	2,054	Direct
April 13, 2015	WLK	Employee Option (Right to Buy)→ Common Stock (2,148)	2,148	Direct
April 13, 2015	WLK	Employee Option (Right to Buy)→ Common Stock (15,358)	15,358	Direct