WLKWestlake CorporationBasic Materials · Chemicals - Specialtyas of 2026-09-16
Horizon

Issued 2026-09-16 at $70.66 · now $70.66 (2026-09-16, +0.0% since)

Based on its own history, a month from the 2026-09-16 close, WLK has typically landed between $59.97 and $82.08 — a range of −15.1% to +16.2% from the issuance price $70.66.

Range of outcomes in historically similar periods — not a price prediction. Ranges are scored publicly on /methodology.
  • Actual close
  • Typical path (median)
  • Middle 50% of outcomes
  • 90% range

5,003 overlapping 1 month windows · 2006-09-26 – 2026-08-17 · basis climatology · forecast (batch). Probability up 53.9% (90% CI 51.7–56.1%, ≈1,408 obs).

The cone is anchored at the 2026-09-16 issuance close ($70.66) — the price the forecast resolves against on 2026-10-15, not the latest close. The drawn path shape is illustrative (bands widen with √t); every labeled number is real — the anchor, the scored batch p90/IQR endpoints, and the typical move.

Where WLK has typically landed a month from the 2026-09-16 close of $70.66 — the range is history, not a prediction.

$59.97worst · -15.1%$82.08best · +16.2%
  • now $70.66 (+0.0%)
  • typicalThe typical outcome — half of similar past periods did better and half did worse (not an average, so a few wild periods don't skew it). $70.67 (+0.0%)
  • middle 50%The central range of outcomes — half of similar past periods landed inside it, a quarter finished above, a quarter below. $65.89–$75.44
  • 90% rangeA nine-in-ten range — in about nine of every ten similar past periods the outcome stayed within these bounds. $59.97–$82.08
Actual 1-month windows behind the coneiEvery overlapping 1-month window in this security's own price history was ranked by realized return; shown are the 3 worst and 3 best of 5,003 windows spanning 2006-09-26 to 2026-09-16. Not cherry-picked — these are the extremes of the full sample. Max drop / max rise are the deepest and highest points reached within each window. See /methodology.
StartReturnMax dropMax rise
3 worst
2020-02-13−55.1%−55.1%+0.0%
2020-02-11−51.2%−51.2%+1.8%
2020-02-14−49.5%−53.7%+0.0%
3 best
2009-03-05+62.3%−1.3%+62.3%
2010-07-06+61.4%+0.0%+61.4%
2009-03-06+57.3%−3.1%+59.3%

5,003 overlapping windows · 2006-09-26 – 2026-09-16 · not cherry-picked

Seasonality · by month iHow this security has tended to do in each calendar month historically — a frequency, never a prediction.

iFor each calendar month, the share of years this security closed higher than the month before, and the average month-over-month return, over ~20 years of its own price history. Cells are shaded by average return. This is historical frequency, not a prediction — no month is a signal.
Jan
50%
+2.1%
n=20
Feb
45%
+2.0%
n=20
Mar
65%
+3.1%
n=20
Apr
60%
+5.1%
n=20
May
45%
−3.6%
n=20
Jun
40%
−2.1%
n=20
Jul
60%
+5.0%
n=20
Aug
60%
+2.4%
n=20
Sep
55%
−0.7%
n=20
Oct
45%
−0.8%
n=20
Nov
65%
+3.7%
n=20
Dec
45%
+0.7%
n=20

Up-frequency and average month-over-month return · historical frequency, not a prediction

Reported insider & political trades

Every Form 4 the people closest to this company have filed with the SEC — plotted against the share price, aggregated by month, and shown with the gap between when each trade happened and when it was disclosed. A public record, not advice.

Share price & reported tradesMonthly open-market valueReporting lag — trade date to filing date2026-092026-082026-072026-062026-052026-042026-032026-022026-012025-122025-112025-102025-092025-08$123$552026-08-11: 2 insider sales, $3.1M — Chao Albert …2026-03-27: 2 insider sales, $2.3M — Bender Mark Steven, Buesinger Robert F.2026-02-27: 2 insider sales, $1.8M — Bender Mark Steven …2025-12-22: 3 insider sales, $3.0M — Chao Albert …2025-12: 3 open-market sales, $3.0M2026-02: 2 open-market sales, $1.8M2026-03: 2 open-market sales, $2.3M2026-08: 2 open-market sales, $3.1M↑ buys↓ salesdirector Chao Albert — Sale on 2026-08-11, filed same daydirector Chao Albert — Sale on 2026-08-11, filed same dayofficer Bender Mark Steven — Sale on 2026-03-27, filed 3 days after the tradeofficer Buesinger Robert F. — Sale on 2026-03-27, filed 4 days after the tradeofficer Bender Mark Steven — Sale on 2026-02-27, filed 3 days after the tradeofficer Bender Mark Steven — Sale on 2026-02-27, filed 3 days after the tradedirector Chao Albert — Sale on 2025-12-22, filed 1 day after the tradedirector Chao Albert — Sale on 2025-12-22, filed 1 day after the tradedirector Chao Albert — Sale on 2025-12-22, filed 1 day after the trade
DatePersonRoleActionShares @ priceValueOwnership Δvs S&P 1mvs S&P 6mOwned afterFiling
2026-08-11Chao AlbertdirectorSale31,384 @ $80.42$2.5M−4.7% of holding−9.8%not yet — horizon still open642,880Form 4 · filed same day
2026-08-11Chao AlbertdirectorSale7,489 @ $79.70$597K−1.1% of holding−9.8%not yet — horizon still open674,264Form 4 · filed same day
2026-03-27Bender Mark StevenofficerSale16,413 @ $112.53$1.8M−36.9% of holding−14.2%not yet — horizon still open28,015Form 4 · filed 3 days after the trade
2026-03-27Buesinger Robert F.officerSale4,000 @ $115.25$461K−10.4% of holding−14.2%not yet — horizon still open34,482Form 4 · filed 4 days after the trade
2026-02-27Bender Mark StevenofficerSale16,988 @ $100.91$1.7M−27.5% of holding+18.2%−40.1%44,854Form 4 · filed 3 days after the trade
2026-02-27Bender Mark StevenofficerSale421 @ $101.52$43K−0.9% of holding+18.2%−40.1%44,433Form 4 · filed 3 days after the trade
2025-12-22Chao AlbertdirectorSale30,604 @ $73.80$2.3M−4.6% of holding+13.9%−3.8%628,243Form 4 · filed 1 day after the trade
2025-12-22Chao AlbertdirectorSale9,711 @ $72.82$707K−1.5% of holding+13.9%−3.8%658,847Form 4 · filed 1 day after the trade
2025-12-22Chao AlbertdirectorSale521 @ $74.44$39K−0.1% of holding+13.9%−3.8%627,722Form 4 · filed 1 day after the trade
2025-05-27Buesinger Robert F.officerSale83 @ $72.70$6K−100.0% of holding+0.9%−29.9%0Form 4 · filed 13 days after the trade
2025-04-22Buesinger Robert F.officerPurchase83 @ $93.39$8Kownership Δ n/a−31.1%−44.6%83Form 4 · filed 48 days after the trade

The vs-S&P columns are a labeled look-back on what the stock did after each filing, measured against the index over the same window. Descriptive history, not a claim about the person or a reason to trade.

245 award / exercise / gift records — not counted as purchases

Awards, option exercises, gifts and tax-withholding disposals are shown separately and never counted as open-market purchases or sales — they carry no conviction information.

DatePersonRoleActionSharesOwned afterFiling
2026-08-31Darby TommyofficerAward / grant1,7911,791Form 4
2026-08-14NORTHCUTT R BRUCEdirectorAward / grant2,1842,184Form 4
2026-08-14Sheets Jeffrey WaynedirectorAward / grant2,1842,184Form 4
2026-08-14Chao Catherine T.directorAward / grant2,1842,184Form 4
2026-08-14CREGG ROGER AdirectorAward / grant2,1842,184Form 4
2026-08-14Lubel Kimberly SdirectorAward / grant2,1842,184Form 4
2026-08-14MCCOLLUM MARK AdirectorAward / grant2,1842,184Form 4
2026-08-14Graff Michael JdirectorAward / grant2,1842,184Form 4
2026-08-14Patel Bhavesh V.directorAward / grant2,1842,184Form 4
2026-08-14Chao David Tsung-HungdirectorAward / grant2,1842,184Form 4
2026-08-14Sabat Carolyn ChaodirectorAward / grant2,1842,184Form 4
2026-08-11Chao AlbertdirectorOption exercise38,873681,753Form 4
2026-08-11Chao AlbertdirectorOption exercise38,87338,873Form 4
2026-08-08CREGG ROGER AdirectorOption exercise2,1682,168Form 4
2026-08-08Chao Catherine T.directorOption exercise2,1682,168Form 4
2026-08-08NORTHCUTT R BRUCEdirectorOption exercise2,1682,168Form 4
2026-08-08Sabat Carolyn ChaodirectorOption exercise2,1682,168Form 4
2026-08-08Chao David Tsung-HungdirectorOption exercise2,1682,168Form 4
2026-08-08MCCOLLUM MARK AdirectorOption exercise2,1682,168Form 4
2026-08-08Graff Michael JdirectorOption exercise2,1682,168Form 4
2026-08-08Sheets Jeffrey WaynedirectorOption exercise2,1682,168Form 4
2026-08-08Lubel Kimberly SdirectorOption exercise2,1682,168Form 4
2026-08-08MCCOLLUM MARK AdirectorOption exercise2,16811,824Form 4
2026-08-08NORTHCUTT R BRUCEdirectorOption exercise2,16823,351Form 4
2026-08-08Sabat Carolyn ChaodirectorOption exercise2,1685,748Form 4
2026-08-08Sheets Jeffrey WaynedirectorOption exercise2,16814,927Form 4
2026-08-08Chao Catherine T.directorOption exercise2,1687,748Form 4
2026-08-08Chao David Tsung-HungdirectorOption exercise2,16811,080Form 4
2026-08-08Graff Michael JdirectorOption exercise2,16823,310Form 4
2026-08-08Lubel Kimberly SdirectorOption exercise2,16813,821Form 4
2026-08-08MCCOLLUM MARK AdirectorOption exercise2,16811,824Form 4
2026-08-08NORTHCUTT R BRUCEdirectorOption exercise2,16823,351Form 4
2026-08-08Sabat Carolyn ChaodirectorOption exercise2,1685,748Form 4
2026-08-08Sheets Jeffrey WaynedirectorOption exercise2,16814,927Form 4
2026-08-08CREGG ROGER AdirectorOption exercise2,1683,507Form 4
2026-08-08CREGG ROGER AdirectorOption exercise2,1683,507Form 4
2026-08-08Chao Catherine T.directorOption exercise2,1687,748Form 4
2026-08-08Chao David Tsung-HungdirectorOption exercise2,16811,080Form 4
2026-08-08Graff Michael JdirectorOption exercise2,16823,310Form 4
2026-08-08Lubel Kimberly SdirectorOption exercise2,16813,821Form 4

Source: SEC Form 4 filings. Each row links to its original filing.

Across 2012–2021, stocks where a CEO, C-suite officer, or director had recently made an open-market common-stock purchase ran about +28 bp per month above the universe average (n=34,268 stock-weeks). A historical tendency, not a prediction.

Congressional disclosures

No congressional trades disclosed for this company.

Research tool, not investment advice — historical frequencies, not recommendations. A product of Marovel Technologies LLC. Full terms.