What is the 13F Pro Quality Score for WLK?

13F Pro ranks WESTLAKE CORP (WLK) on the 13F Pro Quality Score, a 0–100 composite of 32 fundamental signals including return on invested capital, free cash flow consistency, balance-sheet strength, earnings quality, growth durability, and valuation discipline. The score refreshes after each 10-K and 10-Q filing on SEC EDGAR. View WLK's current score at https://13fpro.ai/research/WLK (free sign-up required for the full ranking).

Which hedge funds own the most WLK stock?

Based on the most recent Form 13F-HR filings on SEC EDGAR, the largest reported institutional holders of WLK include Orbis Allan Gray Ltd, Capital World Investors, BlackRock,. Holdings are reported quarterly within 45 days of quarter-end and updated on https://13fpro.ai/research/WLK as soon as new 13F filings post.

Where does 13F Pro source WLK data?

All WESTLAKE CORP fundamentals and ownership data come directly from SEC EDGAR. WESTLAKE CORP files with the SEC under CIK 1262823. 13F Pro ingests XBRL financial facts from 10-K and 10-Q filings, Form 13F-HR institutional holdings, and Form 4 insider transactions, with no third-party rewrites or estimates.

What sector is WLK in?

WESTLAKE CORP (WLK) is classified in the Materials sector. 13F Pro publishes sector-level fund flow analysis and quality leaders at https://13fpro.ai/research/sector/materials.

How often is WLK research updated on 13F Pro?

WLK's fundamentals refresh within hours of each new 10-K or 10-Q filing on SEC EDGAR. Institutional ownership updates after each quarterly 13F filing window. Insider transactions update after each Form 4 filing. The 13F Pro Quality Score recalculates after every fundamentals refresh.

WESTLAKE CORP(WLK)Stock Analysis

AI analysis on 2,800+ stocks →Deep AI analysis on 2,800+ stocks →

Materials →NYSE

Institutional-grade research for retail investors

SEC EDGAR: CIK 1262823 WLK stock profile & AI dashboard →

13F Pro Quality Score

34.6/100

Rank #2,185 of 2,879 stocks

View Materials peers →

Rankings refresh quarterly once 80% of peers have filed (~45 days after quarter-end). Next update: ~Aug 14, 2026.

Revenue Growth

17.7/100

Profitability

18.9/100

Balance Sheet

23.0/100

Earnings Quality

30.0/100

Free Cash Flow

21.1/100

Institutional Flow

41.0/100

Revenue Scale

87.6/100

Dilution Risk

79.9/100

WLK Stock Analysis & AI Quality Score

AI stock analysis and institutional research for WESTLAKE CORP (WLK), a Materials sector company. 13F Pro's AI-powered ranking engine scores WLK at 34.6/100 on a 32-signal composite quality model, placing it at rank #2,185 of 2,879 stocks — the bottom half of the AI-ranked universe. WLK scores in the top quartile across revenue scale (87.6). Areas of concern include revenue growth (17.7) and profitability (18.9), which score below median versus the broader universe. Based on the latest XBRL financial filings (Q1 2026), WESTLAKE CORP reports quarterly revenue of $2.7B, net income of $-169.0M, free cash flow of $-303.0M. Top institutional holders of WLK by reported 13-F value include Orbis Allan Gray Ltd, Capital World Investors, BlackRock,, based on the most recent SEC filings. WLK trades on the NYSE exchange and files with the SEC under CIK 1262823. 13F Pro's AI research platform runs 10 specialized AI analysts — value, growth, momentum, macro, and activist specialists — that debate WLK daily and publish AI-generated analysis with cited SEC sources. The platform aggregates historical XBRL financial facts, 10-Q and 10-K filings, insider Form 4 transactions, and institutional 13-F holdings for WESTLAKE CORP directly from SEC EDGAR. WESTLAKE CORP's 13F Pro composite quality score has ranged between 8 and 80 since 2021, currently 34.6 — a declining long-term trajectory across 56 quarterly and live scoring snapshots.

✦

Fun facts about WESTLAKE CORP

Quirks, history, and lore behind WLK — the kind of stuff that makes a stock memorable.

1
The Basics
U.S. materials company · large-cap · listed on the NYSE · headquartered in Houston, Texas.
2
The Numbers
Annual revenue in the range of $5–6 billion, with operations spanning North America, Europe, and Asia — a genuinely global chemicals footprint from a Texas base.
3
The History
Founded in 2004 through the combination of several legacy chemical assets, it grew aggressively through acquisitions, including a major deal to absorb a large chlorovinyls rival and nearly double in size.
4
The Secret
It is one of the largest producers of chlor-alkali products and PVC in North America — meaning it quietly underpins everything from water pipes to house siding.
5
The Lore
The company snapped up Axiall Corporation in 2016 for roughly $3.8 billion, vaulting itself into the top tier of vinyls and chlorine chemistry globally — not exactly cocktail-party talk, but enormous scale.
6
The Giveaway
Ticker WLK, master of PVC, chlor-alkali, and epoxy resins — this Houston chemicals giant's name sounds like a lakeside stroll but its business is pure industrial backbone.

▶ Think you know your stocks? Play the Daily Ticker

Revenue

Q1 2026

$2.7B

Net Income

Q1 2026

$-169.0M

Free Cash Flow

Q1 2026

$-303.0M

D/E Ratio

Q1 2026

0.71

Revenue & Net Income

Earnings Per Share

Key Financials Over Time

Export Financial Table · Pro+

Revenue

-8.0% YoY

$11.17BFY 2025

FY21 $11.78BFY23 $12.55BFY24 $12.14BFY25 $11.17B

Net Income

-350.5% YoY

$-1.51BFY 2025

FY21 $2.02BFY23 $479.0MFY24 $602.0MFY25 $-1.51B

Operating Income

-280.3% YoY

$-1.58BFY 2025

FY21 $2.80BFY23 $729.0MFY24 $875.0MFY25 $-1.58B

EPS (Diluted)

-352.2% YoY

$-11.70FY 2025

FY21 $15.58FY23 $3.70FY24 $4.64FY25 $-11.70

Total Assets

-3.8% YoY

$19.96BFY 2025

FY21 $18.46BFY23 $21.04BFY24 $20.75BFY25 $19.96B

Total Debt

+33.1% YoY

$6.08BFY 2025

FY21 $5.45BFY23 $5.21BFY24 $4.57BFY25 $6.08B

Op. Cash Flow

-64.6% YoY

$465.0MFY 2025

FY21 $2.39BFY23 $2.34BFY24 $1.31BFY25 $465.0M

Metric	FY 2025	FY 2024	FY 2023	FY 2021	FY 2020	FY 2019
Revenue	$11.17B -8.0%	$12.14B -3.2%	$12.55B +6.5%	$11.78B +57.0%	$7.50B -7.6%	$8.12B
Net Income	$-1.51B -350.5%	$602.0M +25.7%	$479.0M -76.2%	$2.02B +510.6%	$330.0M -21.6%	$421.0M
Operating Income	$-1.58B -280.3%	$875.0M +20.0%	$729.0M -74.0%	$2.80B +552.7%	$429.0M -34.6%	$656.0M
EPS (Diluted)	$-11.70 -352.2%	$4.64 +25.4%	$3.70 -76.3%	$15.58 +508.6%	$2.56 -21.2%	$3.25
Total Assets	$19.96B -3.8%	$20.75B -1.4%	$21.04B +14.0%	$18.46B +33.4%	$13.84B +4.3%	$13.26B
Total Debt	$6.08B +33.1%	$4.57B -12.2%	$5.21B -4.5%	$5.45B +52.8%	$3.57B +3.5%	$3.44B
Operating Cash Flow	$465.0M -64.6%	$1.31B -43.8%	$2.34B -2.4%	$2.39B +84.6%	$1.30B -0.3%	$1.30B

AI Insight: WLK Financial Trends

Westlake has posted six consecutive quarters of losses, with equity eroding $2B and debt surging to $6.1B as operating income collapsed from $406M to -$172M.

• Operating income deteriorated sharply from $406M in Q2 2024 to -$172M in Q1 2026, a swing of nearly $578M.

• Revenue declined steadily from $3,207M in Q2 2024 to $2,533M in Q4 2025, a 21% drop, with only modest recovery to $2,652M in Q1 2026.

• Total debt rose from $4,568M in Q4 2024 to $6,081M in Q4 2025, while equity fell from $10,527M to $8,547M in Q1 2026.

• Operating cash flow turned negative (-$94M) in Q1 2026, repeating the same pattern seen in Q1 2025 (-$77M), suggesting seasonal working-capital pressure.

⚠ Net losses totaling over $1.6B across Q3–Q4 2025 drove equity below $9B; further losses risk meaningful leverage-ratio deterioration.

⚠ Debt jumped $513M in Q3 2025 alone and reached $6,081M by Q4 2025 — monitor refinancing risk and covenant headroom.

⚠ A return to positive operating income is the key inflection to watch; six straight quarters of deterioration suggest no near-term floor yet.

AI Insight: WLK Ratio Trends

Westlake has posted negative operating margins for five consecutive quarters, with ROIC collapsing from 10.3% in Q2 2024 to -4.7% in Q1 2026.

• Operating margin deteriorated from 12.7% in Q2 2024 to -6.5% in Q1 2026, marking five straight quarters of operating losses.

• ROIC swung from a positive 10.3% in Q2 2024 to -20.7% in Q3 2025, recovering only modestly to -4.7% in Q1 2026.

• Leverage rose materially: D/E expanded from 0.43 in Q3–Q4 2024 to 0.71 by Q1 2026, pressuring the balance sheet.

• Q1 2026 operating margin of -6.5% is a sequential improvement from the Q3–Q4 2025 trough of -27.0% and -26.5%, respectively.

⚠ D/E at 0.71 in Q1 2026 is the highest in the dataset; continued losses could accelerate leverage further.

⚠ The partial margin recovery in Q1 2026 warrants monitoring — confirm whether the Q3–Q4 2025 losses were one-off impairments or structural.

⚠ NPM TTM of -14.9% versus Q1 2026 quarterly -6.4% suggests drag from prior quarters; sustained improvement needed to shift TTM positive.

Get alerted when WLK's score changes

Free account: watchlist tracking, the daily AI brief, and the AI screener.

Passwordless sign-in · Payments by Stripe · Auth by Clerk

Available Research

13F Pro tracks comprehensive data for WESTLAKE CORP including:

SEC EDGAR filings (10-K, 10-Q, 8-K)

XBRL financial facts (revenue, EPS, margins)

Insider transactions (Form 4)

Institutional 13F holdings

Quality rankings (32 signals)

AI analyst debates & daily meetings

Historical financial trends

Peer comparison & sector analysis

Top Institutional Holders of WLK

Orbis Allan Gray Ltd
$618.4M5,293,519 sh
Capital World Investors
$491.9M4,211,006 sh
BlackRock, Inc.
$359.7M3,079,087 sh
BRANDES INVESTMENT PARTNERS, LP
$215.3M1,842,650 sh
WELLINGTON MANAGEMENT GROUP LLP
$209.5M1,793,517 sh
VANGUARD PORTFOLIO MANAGEMENT LLC
$206.7M1,769,808 sh
DIMENSIONAL FUND ADVISORS LP
$171.3M1,466,020 sh
VANGUARD CAPITAL MANAGEMENT LLC
$170.0M1,455,594 sh
GOLDMAN SACHS GROUP INC
$162.8M1,393,327 sh
STATE STREET CORP
$161.3M1,380,493 sh

Fund	Value	Shares
Orbis Allan Gray Ltd	$618.4M	5,293,519
Capital World Investors	$491.9M	4,211,006
BlackRock, Inc.	$359.7M	3,079,087
BRANDES INVESTMENT PARTNERS, LP	$215.3M	1,842,650
WELLINGTON MANAGEMENT GROUP LLP	$209.5M	1,793,517
VANGUARD PORTFOLIO MANAGEMENT LLC	$206.7M	1,769,808
DIMENSIONAL FUND ADVISORS LP	$171.3M	1,466,020
VANGUARD CAPITAL MANAGEMENT LLC	$170.0M	1,455,594
GOLDMAN SACHS GROUP INC	$162.8M	1,393,327
STATE STREET CORP	$161.3M	1,380,493

More Materials Companies

View all Materials →

Alcoa Corp

AAUC

Allied Gold Corp

ABAT

AMERICAN BATTERY TECHNOLOGY Co

AEC

ANFIELD ENERGY INC.

AEM

AGNICO EAGLE MINES LTD

FIRST MAJESTIC SILVER CORP

AGI

ALAMOS GOLD INC

ALB

ALBEMARLE CORP

Put WLK on your watchlist

Track score changes the day WESTLAKE CORP files with the SEC, follow the hedge funds that own it, screen 2,800+ AI-scored stocks, and get the daily brief — free.

View Pricing

Free tier includes 13F data, economic indicators, and market overview. Pro starts at $6.67/mo (billed annually).

Passwordless sign-in · Payments by Stripe · Auth by Clerk

Popular Research

AAPL

Apple

MSFT

Microsoft

NVDA

NVIDIA

GOOG

Alphabet

AMZN

Amazon

Is WLK a good stock to buy?

13F Pro's AI-powered analysis of WESTLAKE CORP (WLK) draws on SEC EDGAR-sourced fundamentals, institutional 13F holdings, and insider Form 4 transactions in the Materials sector (listed on NYSE). The 32-signal AI Quality Score, current rank, and full bull/bear verdict for WLK are available on the WLK stock profile dashboard — with the same data, AI insights, ratios, and institutional activity refreshed after every 10-K, 10-Q, 13F, and Form 4 filing.

Which hedge funds own WLK?

Institutional investors are required to disclose their holdings quarterly via SEC Form 13F. 13F Pro aggregates these filings to show which hedge funds, mutual funds, and asset managers are buying or selling WLK. Combined with insider transaction data from Form 4 filings and AI-powered analysis from 10 specialized research agents, 13F Pro provides a comprehensive view of WESTLAKE CORP's investment landscape.