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$WLK

$74.80 -$0.91 (1.2%)

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Insider Transactions

Insider Transaction Summary

LLC TTWFGP

47,257,252 shares

Net: 0 B/S: -

Jean-Marc Gilson

109,139 shares

Net: +109,139 B/S: ∞

Dorothy C Jenkins

73,778 shares

Net: 0 B/S: -

Albert Chao

54,763 shares

Net: +141,883 B/S: 16.39

Roger L. Kearns

40,148 shares

Net: 0 B/S: -

Mark Steven Bender

35,895 shares

Net: +1,248 B/S: 1.63

Robert F. Buesinger

34,482 shares

Net: +18,901 B/S: 6.03

James Chao

27,382 shares

Net: +37,415 B/S: ∞

L. Benjamin Ederington

25,656 shares

Net: +29,555 B/S: ∞

H JOHN JR RILEY

22,652 shares

Net: 0 B/S: -

R BRUCE NORTHCUTT

21,183 shares

Net: 0 B/S: -

Michael J Graff

21,142 shares

Net: 0 B/S: -

Andrew Kenner

20,362 shares

Net: 0 B/S: -

Thomas J. Janssens

17,127 shares

Net: 0 B/S: -

Simon Bates

15,079 shares

Net: 0 B/S: -

Scott Thomas Szwejbka

14,595 shares

Net: +22,549 B/S: ∞

Jeffrey Wayne Sheets

12,759 shares

Net: 0 B/S: -

Kimberly S Lubel

11,653 shares

Net: 0 B/S: -

Marius Haas

11,631 shares

Net: 0 B/S: -

ROBERT T BLAKELY

10,989 shares

Net: 0 B/S: -

Lawrence E. Teel

9,805 shares

Net: 0 B/S: -

MARK A MCCOLLUM

9,656 shares

Net: 0 B/S: -

David Tsung-Hung Chao

8,912 shares

Net: 0 B/S: -

MAX L LUKENS

7,713 shares

Net: 0 B/S: -

Michael J. Mattina

6,506 shares

Net: 0 B/S: -

Catherine T. Chao

5,580 shares

Net: 0 B/S: -

George J Mangieri

4,695 shares

Net: 0 B/S: -

Johnathan Stevan Zoeller

4,416 shares

Net: 0 B/S: -

Jeffrey Adam Holy

4,394 shares

Net: +5,070 B/S: ∞

John Tsung-chen Chao

4,044 shares

Net: +4,494 B/S: ∞

Carolyn Chao Sabat

3,580 shares

Net: 0 B/S: -

Brian John Powers

1,961 shares

Net: +1,961 B/S: ∞

Bhavesh V. Patel

1,852 shares

Net: +1,852 B/S: ∞

ROGER A CREGG

1,339 shares

Net: +1,339 B/S: ∞

Insider Name	Current Shares	Net Change (1yr)	Buy/Sell Ratio
LLC TTWFGP	47,257,252	0	-
Jean-Marc Gilson	109,139	+109,139	∞
Dorothy C Jenkins	73,778	0	-
Albert Chao	54,763	+141,883	16.39
Roger L. Kearns	40,148	0	-
Mark Steven Bender	35,895	+1,248	1.63
Robert F. Buesinger	34,482	+18,901	6.03
James Chao	27,382	+37,415	∞
L. Benjamin Ederington	25,656	+29,555	∞
H JOHN JR RILEY	22,652	0	-
R BRUCE NORTHCUTT	21,183	0	-
Michael J Graff	21,142	0	-
Andrew Kenner	20,362	0	-
Thomas J. Janssens	17,127	0	-
Simon Bates	15,079	0	-
Scott Thomas Szwejbka	14,595	+22,549	∞
Jeffrey Wayne Sheets	12,759	0	-
Kimberly S Lubel	11,653	0	-
Marius Haas	11,631	0	-
ROBERT T BLAKELY	10,989	0	-
Lawrence E. Teel	9,805	0	-
MARK A MCCOLLUM	9,656	0	-
David Tsung-Hung Chao	8,912	0	-
MAX L LUKENS	7,713	0	-
Michael J. Mattina	6,506	0	-
Catherine T. Chao	5,580	0	-
George J Mangieri	4,695	0	-
Johnathan Stevan Zoeller	4,416	0	-
Jeffrey Adam Holy	4,394	+5,070	∞
John Tsung-chen Chao	4,044	+4,494	∞
Carolyn Chao Sabat	3,580	0	-
Brian John Powers	1,961	+1,961	∞
Bhavesh V. Patel	1,852	+1,852	∞
ROGER A CREGG	1,339	+1,339	∞

Individual Transactions

May 13, 2026

Mark Steven Bender

Tax Payment

Change: -5,284

Price: $97.34

Shares: 35,895

Value: -$514,344

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Mark Steven Bender	May 14	Tax Payment (F) Tax Payment	35,895	-5,284	$97.34	-$514,344

May 12, 2026

Mark Steven Bender

Option Exercise/Conversion

Change: +13,164

Price: $0.00

Shares: 41,179

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Mark Steven Bender	May 14	Option Exercise/Conversion (M) Compensation/Award	41,179	+13,164	$0.00	+$0

April 02, 2026

Brian John Powers

Grant/Award Acquisition

Change: +1,961

Price: $0.00

Shares: 1,961

Value: +$0

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Brian John Powers	Apr 06	Grant/Award Acquisition (A) Compensation/Award	1,961	+1,961	$0.00	+$0

March 27, 2026

Robert F. Buesinger

Open Market Sale

Change: -4,000

Price: $115.25

Shares: 34,482

Value: -$461,000

Mark Steven Bender

Open Market Sale

Change: -16,413

Price: $112.54

Shares: 28,015

Value: -$1,847,036

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Robert F. Buesinger	Mar 31	Open Market Sale (S) Market Sale	34,482	-4,000	$115.25	-$461,000
Mark Steven Bender	Mar 30	Open Market Sale (S) Market Sale	28,015	-16,413	$112.54	-$1,847,036

February 27, 2026

Mark Steven Bender

Option Exercise/Conversion

Change: +6,199

Price: $65.81

Shares: 68,041

Value: +$407,971

Mark Steven Bender

Open Market Sale

Change: -16,988

Price: $100.91

Shares: 44,854

Value: -$1,714,259

Mark Steven Bender

Disposition to Issuer

Change: -12,693

Price: $98.20

Shares: 61,842

Value: -$1,246,452

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Mark Steven Bender	Mar 02	Option Exercise/Conversion (M) Compensation/Award	68,041	+6,199	$65.81	+$407,971
Mark Steven Bender	Mar 02	Open Market Sale (S) Market Sale	44,854	-16,988	$100.91	-$1,714,259
Mark Steven Bender	Mar 02	Disposition to Issuer (D) Payment to Issuer	61,842	-12,693	$98.20	-$1,246,452

February 20, 2026

Bhavesh V. Patel

Grant/Award Acquisition

Change: +1,852

Price: $0.00

Shares: 1,852

Value: +$0

Scott Thomas Szwejbka

Grant/Award Acquisition

Change: +14,595

Price: $0.00

Shares: 14,595

Value: +$0

Scott Thomas Szwejbka

Tax Payment

Change: -91

Price: $94.10

Shares: 13,773

Value: -$8,563

Jeffrey Adam Holy

Grant/Award Acquisition

Change: +4,394

Price: $0.00

Shares: 4,394

Value: +$0

Jeffrey Adam Holy

Tax Payment

Change: -81

Price: $94.10

Shares: 5,124

Value: -$7,622

Jean-Marc Gilson

Grant/Award Acquisition

Change: +109,139

Price: $0.00

Shares: 109,139

Value: +$0

L. Benjamin Ederington

Grant/Award Acquisition

Change: +25,656

Price: $0.00

Shares: 25,656

Value: +$0

L. Benjamin Ederington

Tax Payment

Change: -357

Price: $94.10

Shares: 80,158

Value: -$33,594

Robert F. Buesinger

Grant/Award Acquisition

Change: +19,351

Price: $0.00

Shares: 19,351

Value: +$0

Robert F. Buesinger

Tax Payment

Change: -326

Price: $94.10

Shares: 38,482

Value: -$30,676

Mark Steven Bender

Grant/Award Acquisition

Change: +28,389

Price: $0.00

Shares: 28,389

Value: +$0

Mark Steven Bender

Tax Payment

Change: -445

Price: $94.10

Shares: 61,842

Value: -$41,874

Insider	Filing Date	Transaction	Shares	Change	Price	Value
Bhavesh V. Patel	Feb 24	Grant/Award Acquisition (A) Compensation/Award	1,852	+1,852	$0.00	+$0
Scott Thomas Szwejbka	Feb 23	Grant/Award Acquisition (A) Compensation/Award	14,595	+14,595	$0.00	+$0
Scott Thomas Szwejbka	Feb 23	Tax Payment (F) Tax Payment	13,773	-91	$94.10	-$8,563
Jeffrey Adam Holy	Feb 23	Grant/Award Acquisition (A) Compensation/Award	4,394	+4,394	$0.00	+$0
Jeffrey Adam Holy	Feb 23	Tax Payment (F) Tax Payment	5,124	-81	$94.10	-$7,622
Jean-Marc Gilson	Feb 23	Grant/Award Acquisition (A) Compensation/Award	109,139	+109,139	$0.00	+$0
L. Benjamin Ederington	Feb 23	Grant/Award Acquisition (A) Compensation/Award	25,656	+25,656	$0.00	+$0
L. Benjamin Ederington	Feb 23	Tax Payment (F) Tax Payment	80,158	-357	$94.10	-$33,594
Robert F. Buesinger	Feb 23	Grant/Award Acquisition (A) Compensation/Award	19,351	+19,351	$0.00	+$0
Robert F. Buesinger	Feb 23	Tax Payment (F) Tax Payment	38,482	-326	$94.10	-$30,676
Mark Steven Bender	Feb 23	Grant/Award Acquisition (A) Compensation/Award	28,389	+28,389	$0.00	+$0
Mark Steven Bender	Feb 23	Tax Payment (F) Tax Payment	61,842	-445	$94.10	-$41,874