Join

Compare · IOSP vs WLK

IOSP vs WLK

Side-by-side comparison of Innospec Inc. (IOSP) and Westlake Corporation (WLK): market cap, price performance, sector, and recent activity on the wire.

Summary

  • Both IOSP and WLK operate in Major Chemicals (Industrials), so they compete in similar markets.
  • WLK is the larger of the two at $10.84B, about 5.5x IOSP ($1.99B).
  • Over the past year, IOSP is down 7.4% and WLK is up 12.5% - WLK leads by 19.9 points.
  • WLK has been more active in the news (4 items in the past 4 weeks vs 2 for IOSP).
  • WLK has more recent analyst coverage (25 ratings vs 2 for IOSP).
PerformanceIOSP-7.42%WLK+12.49%
2025-06-09+0.00%2026-06-08
MetricIOSPWLK
Company
Innospec Inc.
Westlake Corporation
Price
$81.31+0.28%
$85.39+0.97%
Market cap
$1.99B
$10.84B
1M return
+6.17%
-12.31%
1Y return
-7.42%
+12.49%
Industry
Major Chemicals
Major Chemicals
Exchange
NASDAQ
NYSE
IPO
2004
News (4w)
2
4
Recent ratings
2
25
IOSP

Innospec Inc.

Innospec Inc. develops, manufactures, blends, markets, and supplies specialty chemicals in the United States, rest of North America, the United Kingdom, rest of Europe, and internationally. It operates through Fuel Specialties, Performance Chemicals, and Oilfield Services segments. The Fuel Specialties segment offers a range of specialty chemical products used as additives in various fuels. Its products are used in the operation of automotive, marine, and aviation engines; power station generators; and heating oil. The Performance Chemicals segment provides technology-based solutions for its customers' processes or products focused in the personal care, home care, agrochemical, and metal extraction markets. The Oilfield Services segment develops and markets products to prevent loss of mud in drilling operations; chemical solutions for fracturing, stimulation, and completion operations; and products for oil and gas production, which enable flow assurance and maintain asset integrity. It sells its products primarily to oil and gas exploration and production companies, oil refineries, fuel manufacturers and users, personal care and home care companies, formulators of agrochemical and metal extraction formulations, and other chemical and industrial companies. The company was formerly known as Octel Corp. and changed its name to Innospec Inc. in January 2006. Innospec Inc. was founded in 1938 and is headquartered in Englewood, Colorado.

WLK

Westlake Corporation

Westlake Chemical Corporation, together with its subsidiaries, manufactures and markets basic chemicals, vinyls, polymers, and building products worldwide. It operates through two segments, Vinyls and Olefins. The Vinyls segment provides specialty and commodity polyvinyl chloride (PVC), vinyl chloride monomers, ethylene dichloride, chlorine, caustic soda, chlorinated derivative, and ethylene products. This segment also manufactures and sells PVC compounds and building products fabricated from PVC, including residential siding, trim and molding, pipe and fittings for various water, sewer and industrial applications, profiles for windows and doors, decking products, films for various inflatables, wall covering tapes, roofing applications, and composite roof tiles. The Olefins segment offers polyethylene, styrene monomers, and various ethylene co-products, as well as sells propylene, crude butadiene, pyrolysis gasoline, and hydrogen products. Westlake Chemical Corporation offers its products to a range of customers, including chemical processors, plastics fabricators, small construction contractors, municipalities, and supply warehouses in various consumer and industrial markets, such as flexible and rigid packaging, automotive products, coatings, water treatment, refrigerants, and residential and commercial construction, as well as other durable and non-durable goods. The company was founded in 1986 and is headquartered in Houston, Texas. Westlake Chemical Corporation is a subsidiary of TTWF LP.