Company · WLK · CIK 1262823

Westlake Corp (WLK) SEC filings and CIK.

WLK’s SEC Central Index Key (CIK) is 0001262823, or 1262823 without leading zeros. The SEC’s ticker file lists it as WESTLAKE CORP.

Ticker: WLK
CIK: 0001262823
Other tickers: None
Insider transactions, Q3 2026: 12

Insider trading

In Q3 2026, insiders at Westlake Corp reported 12 non-derivative transactions on 22 Forms 3, 4 and 5, including 0 open-market purchases and 2 sales. See every WLK insider transaction →

Recent filings we observed

No filings for this CIK appear in our current observation window. The full history is available from the filings endpoint below and on SEC.gov.

Get WLK SEC data through the API

Filing history

curl "https://sec-api.dev/api/v1/filings?cik=1262823&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Company profile

curl "https://sec-api.dev/api/v1/companies/1262823" \
  -H "Authorization: Bearer $SEC_API_KEY"

Reported XBRL facts

curl "https://sec-api.dev/api/v1/facts/1262823?taxonomy=us-gaap&concept=Revenues&limit=10" \
  -H "Authorization: Bearer $SEC_API_KEY"

Ticker to CIK API · SEC filings API · Westlake Corp on SEC.gov

Questions

What is WLK’s CIK number?

WLK’s SEC Central Index Key (CIK) is 0001262823, or 1262823 without leading zeros. The SEC’s ticker file lists it as WESTLAKE CORP.

How do I find Westlake Corp’s 10-K?

Request /api/v1/filings?cik=1262823&form=10-K, or open the company’s EDGAR page and filter by 10-K. Foreign issuers file 20-F or 40-F instead.

Ticker and CIK: SEC company_tickers.json, cached 2026-11-02. Tickers can move between entities; the CIK identifies the filer.

Plain-text version for agents and LLMs: /companies/wlk.md

Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.