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Westlake Corporation: diluted weighted-average shares

Diluted weighted-average shares for Westlake Corporation. Inspect selected reporting periods, original units and SEC filing links; download the financial history.

All Westlake Corporation financial histories

What this measure means

Weighted-average shares used for diluted earnings per share. Potential shares are included under the applicable dilution rules, not simply added to outstanding shares.

Exact concept: us-gaap:WeightedAverageNumberOfDilutedSharesOutstanding. Each value covers an annual-duration reporting interval, shown with both start and end dates. Different units remain separate; no currency conversion or interpolation is applied.

Coverage of this history

Selected reporting periods run from 2009-01-01 to 2025-12-31. The SEC response was captured on 2026-09-20.

Selected filing history

Diluted weighted-average shares in original reported units, latest-filed observation per period
Period startPeriod endValueUnitFiledSource filing
2025-01-012025-12-31128,260,331shares2026-02-2610-K · 0001262823-26-000016
2024-01-012024-12-31129,206,922shares2026-02-2610-K · 0001262823-26-000016
2023-01-012023-12-31128,598,441shares2026-02-2610-K · 0001262823-26-000016
2022-01-012022-12-31128,845,562shares2025-02-2510-K · 0001262823-25-000011
2021-01-012021-12-31128,697,982shares2024-02-2210-K · 0001262823-24-000014
2020-01-012020-12-31128,089,058shares2023-02-2210-K · 0001262823-23-000011
2019-01-012019-12-31128,757,293shares2022-02-2310-K · 0001262823-22-000014
2018-01-012018-12-31129,985,753shares2021-02-2410-K · 0001262823-21-000023
2017-01-012017-12-31129,540,013shares2020-02-1910-K · 0001262823-20-000007
2016-01-012016-12-31129,974,822shares2019-02-2010-K · 0001262823-19-000012
2015-01-012015-12-31132,301,812shares2018-02-2110-K · 0001262823-18-000008
2014-01-012014-12-31133,643,414shares2017-02-2210-K · 0001262823-17-000008
2013-01-012013-12-31133,779,250shares2016-02-2410-K · 0001262823-16-000030
2012-01-012012-12-31133,282,990shares2015-02-2510-K · 0001262823-15-000007
2011-01-012011-12-3166,300,158shares2014-02-2110-K · 0001262823-14-000007
2010-01-012010-12-3165,676,664shares2013-02-2210-K · 0001262823-13-000007
2009-01-012009-12-3165,421,390shares2012-02-2310-K · 0001193125-12-075023

Related financial histories

Inspect the source

Entity
Westlake Corporation / CIK 0001262823
Captured
2026-09-20T07:47:15.635Z
SEC response SHA-256
cea7c11dfd3af2f332304a11e723d95447af9482ca953a1a21ea51067df2997b

Current SEC company facts · Download the original response snapshot (gzip) · Download the selected JSON

Latest-filed annual-report facts per unit and reporting period at capture time. Duration facts cover 300 to 400 days. This selection can include restatements and is not a point-in-time backtest dataset. Missing concepts are omitted, never zero-filled. Values retain original units and are not currency converted. Extended concepts require compatible unit shapes and at least three reporting ends with changing values within one unit. Constant or incompatible added histories are omitted.

Public company accounting reference, not market prices, returns, an investment recommendation, or ALPHAC performance. Validate a separately constructed return series with the validation API; accounting values are not returns.

Use this in research

A financial period ends before its results become public. Use the filing date as a minimum availability boundary, inspect amendments, and retain the original filing vintage when testing historical signals. This latest-filed selection can contain information unavailable at the time.

These pages do not supply prices, total-return histories, corporate-action adjustments or a tradable universe. Build those inputs separately before evaluating a strategy. A profitable backtest can still reflect selection bias or costs that were left out.

Research methodology · Execution and cost assumptions · Check backtest overfitting

Build with the open-source tools

Use these accounting records as inspectable inputs. When you have constructed a return series, the validation tools can help test its statistical evidence and preserve the result with its limitations.

Read the published dataset with Python
import json
from urllib.request import urlopen

with urlopen("https://canlicapital.com/company-data/0001262823.json") as response:
    record = json.load(response)
print(record["fetched_at"])
print(record["policy"])
for concept in record["concepts"]:
    print(concept["tag"], next(iter(concept["observations"])))