MarketPeel
Insider Trading Intelligence
MB

Mark Steven Bender

WLK
EVP AND CFO · WESTLAKE CORP · CIK 0001330417
FILING MIX · LIFETIME45%/55%
BUYS
66
SELLS
82
TOTAL VALUE
$36.37M
COMPANIES
2
ACTIVE SINCE
Feb 2020
HOLDINGS NOW
49,895
AVG SELL PX
$108.56
TRADE KIND
SHOWING 148 / 148
Trades · vs SPY
Loading price series…
Performance · forward returns vs SPY
27 backtested trades · 8 horizons · 9 pendingHow are these numbers computed? →
Forward-return performance of every backtestable P/S trade by Mark Steven Bender, measured at 8 horizons from 7 days to 2 years. Deduped per economic event so co-filings count once. Excess return = trade return minus SPY return over the same window.
HORIZONTRADESWIN RATEINSIDER RETURNSPY RETURNMEAN EXCESSMEDIAN EXCESST-STAT
7d27+59.26%-1.78%-0.38%-1.40%-2.12%
14d27+62.96%-0.78%-0.08%-0.70%-0.32%
30d27+33.33%+3.70%-0.59%+4.29%+6.02%
60d27+22.22%+6.43%-0.80%+8.31%+9.46%
90d27+59.26%-3.96%-1.63%-1.39%-1.57%
180d27(3 pending)+70.83%-1.43%+0.20%-1.64%-13.59%
1y27(3 pending)+62.50%+8.12%+5.89%+2.23%+2.54%
2y27(3 pending)+20.83%+25.77%+19.51%+6.26%+6.85%
How to read this: Insider Returnis the average raw return of the filer's trades over the horizon. SPY Return is what SPY did over those same windows — reference only, not a comparison. The headline alpha number is Mean Excess = Insider − SPY; green means the filer beat SPY, red means they trailed it. Win rate is the share of individual trades where the filer beat SPY. T-statvalues above 2 mean the alpha is unlikely to be chance given the sample size. "Pending" counts trades where the horizon hasn't elapsed yet; their stats are not included in the row average.
Holdings over time
WLK · 35,895 shares · as of May 13, 2026
018,63437,26855,90174,535202120222023202420252026SHARES HELD
Trading cadence · quarterly flow
BUY SELL
2020
2020
2020
2020
2021
2021
2021
2021
2022
2022
2022
2022
2023
2023
2023
2023
2024
2024
2024
2024
2025
2025
2025
2025
2026
2026
FLOW · 66 buys / 82 sellsCOVERAGE · 26 quarters
Form 4 filings · all activity
COMPANYTYPESHARESPRICEVALUEHELD AFTERTRADE DATEFILEDDETAILS
WLK
WESTLAKE CORP
SALE
EVP & CFO
5,284$97.34$514.3K35,895May 13, 2026May 14, 2026View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
13,1640May 12, 2026May 14, 2026View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
13,16441,179May 12, 2026May 14, 2026View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
16,413$112.54$1.85M28,015Mar 27, 2026Mar 30, 2026View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
6,4940Feb 27, 2026Mar 2, 2026View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
12,693$98.20$1.25M61,842Feb 27, 2026Mar 2, 2026View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
6,199$65.81$408.0K68,041Feb 27, 2026Mar 2, 2026View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
6,1990Feb 27, 2026Mar 2, 2026View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
16,988$100.91$1.71M44,854Feb 27, 2026Mar 2, 2026View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
421$101.52$42.7K44,433Feb 27, 2026Mar 2, 2026View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
6,494$86.54$562.0K74,535Feb 27, 2026Mar 2, 2026View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
445$94.10$41.9K61,842Feb 20, 2026Feb 23, 2026View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
28,38928,389Feb 20, 2026Feb 23, 2026View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
7,7477,747Feb 20, 2026Feb 23, 2026View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
1,77762,287Feb 19, 2026Feb 23, 2026View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
1,209$98.95$119.6K60,510Feb 18, 2026Feb 19, 2026View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
4,7510Feb 17, 2026Feb 19, 2026View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
4,75161,719Feb 17, 2026Feb 19, 2026View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
6,3916,391Feb 21, 2025Feb 24, 2025View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
3,530$110.54$390.2K56,968Feb 21, 2025Feb 24, 2025View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
19,27919,279Feb 21, 2025Feb 24, 2025View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
8,81960,498Feb 20, 2025Feb 24, 2025View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
4,264$111.46$475.3K51,861Feb 19, 2025Feb 20, 2025View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
132$112.76$14.9K51,679Feb 19, 2025Feb 20, 2025View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
50$112.46$5.6K51,811Feb 19, 2025Feb 20, 2025View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
13,98756,125Feb 18, 2025Feb 20, 2025View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
13,9870Feb 18, 2025Feb 20, 2025View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
1,156$145.44$168.1K42,138Aug 14, 2024Aug 15, 2024View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
2,9380Aug 13, 2024Aug 15, 2024View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
2,93843,294Aug 13, 2024Aug 15, 2024View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
4,950$152.19$753.3K40,356May 3, 2024May 6, 2024View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
4,804$141.02$677.5K45,306Mar 6, 2024Mar 7, 2024View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
4,854$137.57$667.8K50,110Feb 26, 2024Feb 28, 2024View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
5,597$129.92$727.2K55,511Feb 20, 2024Feb 21, 2024View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
547$138.68$75.9K54,964Feb 20, 2024Feb 21, 2024View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
5,5580Feb 19, 2024Feb 21, 2024View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
5,55861,108Feb 19, 2024Feb 21, 2024View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
4,4594,459Feb 16, 2024Feb 20, 2024View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
12,34412,344Feb 16, 2024Feb 20, 2024View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
11,15055,550Feb 16, 2024Feb 21, 2024View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
12,6066,494Aug 7, 2023Aug 9, 2023View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
19,598$133.48$2.62M47,025Aug 7, 2023Aug 9, 2023View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
12,0330Aug 7, 2023Aug 9, 2023View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
12,033$107.75$1.30M56,433Aug 7, 2023Aug 9, 2023View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
12,606$86.54$1.09M69,039Aug 7, 2023Aug 9, 2023View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
2,625$133.99$351.7K44,400Aug 7, 2023Aug 9, 2023View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
2,416$132.43$320.0K66,623Aug 7, 2023Aug 9, 2023View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
13,16413,164May 12, 2023May 16, 2023View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
1,084$120.03$130.1K44,400May 8, 2023May 10, 2023View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
1,084$65.81$71.3K45,484May 8, 2023May 10, 2023View →
WLK
WESTLAKE CORP
PURCHASE
EVP & CFO
1,0846,199May 8, 2023May 10, 2023View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
5,728$104.32$597.5K44,704Mar 13, 2023Mar 15, 2023View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
304$104.76$31.8K44,400Mar 13, 2023Mar 15, 2023View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
3,000$120.50$361.5K50,432Feb 27, 2023Feb 28, 2023View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
3,0007,283Feb 27, 2023Feb 28, 2023View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
3,000$65.81$197.4K53,432Feb 27, 2023Feb 28, 2023View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
14,34250,432Feb 17, 2023Mar 15, 2023View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
14,34250,432Feb 17, 2023Feb 17, 2023View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
12,97112,971Feb 17, 2023Feb 21, 2023View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
4,7514,751Feb 17, 2023Feb 21, 2023View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
25$122.56$3.1K36,090Feb 15, 2023Feb 16, 2023View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
1,760$121.86$214.5K36,115Feb 15, 2023Feb 16, 2023View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
7,1500Feb 14, 2023Feb 16, 2023View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
7,15037,875Feb 14, 2023Feb 16, 2023View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
2,0610Mar 31, 2022Apr 1, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
2,061$79.83$164.5K32,786Mar 31, 2022Apr 1, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
100$124.99$12.5K30,725Mar 31, 2022Apr 1, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
3,960$65.81$260.6K36,746Mar 31, 2022Apr 1, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
3,9600Mar 31, 2022Apr 1, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
5,921$124.34$736.2K30,825Mar 31, 2022Apr 1, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
3,0003,960Mar 30, 2022Mar 31, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
3,000$65.81$197.4K36,725Mar 30, 2022Mar 31, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
3,0002,061Mar 30, 2022Mar 31, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
2,938$124.50$365.8K33,787Mar 30, 2022Mar 31, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
3,000$79.83$239.5K33,725Mar 30, 2022Mar 31, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
3,062$125.10$383.0K30,725Mar 30, 2022Mar 31, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
4,000$122.44$489.7K30,725Mar 29, 2022Mar 30, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
2,000$79.83$159.7K32,725Mar 29, 2022Mar 30, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
2,0005,061Mar 29, 2022Mar 30, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
2,0006,960Mar 29, 2022Mar 30, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
2,000$65.81$131.6K34,725Mar 29, 2022Mar 30, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
4,000$65.81$263.3K38,725Mar 25, 2022Mar 28, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
4,0007,061Mar 25, 2022Mar 28, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
4,000$79.83$319.3K34,725Mar 25, 2022Mar 28, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
5,053$125.11$632.2K33,672Mar 25, 2022Mar 28, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
4,0008,960Mar 25, 2022Mar 28, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
2,947$125.74$370.6K30,725Mar 25, 2022Mar 28, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
4,00012,960Mar 24, 2022Mar 25, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
4,000$65.81$263.3K38,725Mar 24, 2022Mar 25, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
4,00011,061Mar 24, 2022Mar 25, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
8,000$125.38$1.00M30,725Mar 24, 2022Mar 25, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
3,000$65.81$197.4K36,725Mar 23, 2022Mar 24, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
5,656$125.14$707.8K31,069Mar 23, 2022Mar 24, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
3,00015,061Mar 23, 2022Mar 24, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
344$125.69$43.2K30,725Mar 23, 2022Mar 24, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
3,00016,960Mar 23, 2022Mar 24, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
2,810$118.51$333.0K30,725Mar 14, 2022Mar 15, 2022View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
7,92333,536Feb 18, 2022Feb 22, 2022View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
13,98713,987Feb 18, 2022Feb 22, 2022View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
14,98014,980Feb 18, 2022Feb 22, 2022View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
7,92233,535Feb 18, 2022Mar 15, 2022View →
WLK
WESTLAKE CORP
SALE
EVP & CFO
1,171$104.96$122.9K25,608Feb 16, 2022Mar 6, 2026View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
1,166$104.96$122.4K25,613Feb 16, 2022Feb 17, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
4,7550Feb 15, 2022Feb 17, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
4,75526,779Feb 15, 2022Feb 17, 2022View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
2,369$101.57$240.6K22,024Nov 11, 2021Nov 15, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
631$100.77$63.6K24,393Nov 8, 2021Nov 10, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
6,356$98.80$627.9K25,024Nov 5, 2021Nov 8, 2021View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
2,9382,938Aug 13, 2021Aug 16, 2021View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
4,000$79.83$319.3K34,725Mar 24, 2021Mar 25, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
3,000$79.83$239.5K33,725Mar 23, 2021Mar 24, 2022View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
10,740$45.70$490.8K42,120Mar 12, 2021Mar 15, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
10,7400Mar 12, 2021Mar 15, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
9,920$94.39$936.3K37,200Mar 12, 2021Mar 15, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
5,820$95.23$554.2K31,380Mar 12, 2021Mar 15, 2021View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
5,000$61.87$309.3K47,120Mar 12, 2021Mar 15, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
5,0000Mar 12, 2021Mar 15, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
15,9955,000Mar 9, 2021Mar 10, 2021View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
15,995$61.87$989.5K57,191Mar 9, 2021Mar 10, 2021View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
9,816$63.98$628.0K41,196Mar 9, 2021Mar 10, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
9,8160Mar 9, 2021Mar 10, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
25,811$92.27$2.38M31,380Mar 9, 2021Mar 10, 2021View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
5,5585,558Feb 19, 2021Feb 22, 2021View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
19,10019,100Feb 19, 2021Feb 22, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
808$85.08$68.7K31,380Feb 18, 2021Feb 18, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
4$87.38$35028,958Feb 16, 2021Feb 17, 2021View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
398$85.73$34.1K28,962Feb 16, 2021Feb 17, 2021View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
398$85.73$34.1K28,962Feb 16, 2021Feb 17, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
4$87.38$35028,958Feb 16, 2021Feb 17, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
3,2300Feb 16, 2021Feb 18, 2021View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
3,23032,188Feb 16, 2021Feb 18, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
1,4780Feb 14, 2021Feb 17, 2021View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
1,47829,360Feb 14, 2021Feb 17, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
1,4780Feb 14, 2021Feb 17, 2021View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
1,47829,360Feb 14, 2021Feb 17, 2021View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
1,600$74.79$119.7K27,882Nov 6, 2020Nov 10, 2020View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
420$74.54$31.3K29,482Nov 5, 2020Nov 6, 2020View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
24,9960Nov 5, 2020Nov 6, 2020View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
24,996$44.42$1.11M54,478Nov 5, 2020Nov 6, 2020View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
24,576$73.98$1.82M29,902Nov 5, 2020Nov 6, 2020View →
WLKP
WESTLAKE CHEMICAL PARTNERS LP
PURCHASE
SVP, CFO
1,000$14.91$14.9K14,000Mar 13, 2020Mar 16, 2020View →
WLKP
WESTLAKE CHEMICAL PARTNERS LP
PURCHASE
SVP, CFO
1,000$15.07$15.1K13,000Mar 12, 2020Mar 16, 2020View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
1,457$60.52$88.2K29,482Feb 18, 2020Feb 19, 2020View →
WLK
WESTLAKE CORP
SALE
EVP and CFO
5,3750Feb 17, 2020Feb 19, 2020View →
WLK
WESTLAKE CORP
PURCHASE
EVP and CFO
5,37530,939Feb 17, 2020Feb 19, 2020View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
30,24330,243Feb 14, 2020Feb 18, 2020View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
7,1507,150Feb 14, 2020Feb 18, 2020View →
WLK
WESTLAKE CORP
PURCHASEGRANT
Stock grant
1,4781,478Feb 14, 2020Feb 18, 2020View →
Other insiders · WLK
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About this filer
CIK 0001330417
ROLE
EVP and CFO
PRIMARY
WLK
COMPANIES
2
ACTIVE SINCE
Feb 2020
MARKETPEEL · /INSIDER/0001330417DATA · SEC EDGAR · FORM 4 · CONSOLIDATED TAPE
FREE · DAILY · 6 AM ET

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