What is SIC code 4991?

SIC code 4991 represents the Cogeneration Services & Small Power Producers industry. SIC (Standard Industrial Classification) is a four-digit code system used by the U.S. SEC to classify companies by their primary line of business. There are 3 public companies registered under this code in the SEC EDGAR database.

What is the largest Cogeneration Services & Small Power Producers company by revenue?

AES CORP is the largest company in the Cogeneration Services & Small Power Producers industry by revenue, reporting $12.2B in FY2025 according to its SEC EDGAR 10-K annual filing. Companies in this industry with available XBRL data collectively reported $12.2B in revenue across their most recent fiscal years.

Cogeneration Services & Small Power Producers

Q: How many public companies are in the Cogeneration Services & Small Power Producers industry?

There are 3 SEC-registered public companies classified under SIC code 4991 (Cogeneration Services & Small Power Producers) in the SEC EDGAR database.

SIC 4991 · 3 companies

This page lists all SEC-registered public companies classified under SIC code 4991 (Cogeneration Services & Small Power Producers). SIC — Standard Industrial Classification — is a four-digit code system used by the SEC to group companies by their primary line of business. You can also view financial rankings for this industry.

The Cogeneration Services & Small Power Producers industry includes 3 SEC-registered public companies. The largest by revenue is AES CORP, which reported $12.2B in FY2025. Companies in this industry with available XBRL data collectively reported $12.2B in revenue across their most recent fiscal years.

Company	Ticker	Exchange	State	Filings
AES CORP	AES	NYSE	DE	1,005
LELANTOS HOLDINGS INC.	LNTO	OTC	FL	26
MASS MEGAWATTS WIND POWER INC	MMMW	OTC	MA	353