A few firms with links to the glass and glazing industry are on the Forbes list of America’s largest private companies, released last week.

Silhouette Group of People with American FlagThis year, 223 companies made it onto the annual ranking. Combined, these companies have revenues of $1.62 trillion and employ more than 4.5 million people, according to Forbes.

Here’s a look at the glass industry-related companies on the list (category in parenthesis):

No. 52: Momentive (chemicals)

An adhesive and sealant supplier to the building and construction industries, Momentive recorded 2015 revenues of $6.4 billion and employs 10,100 people.

No. 67: Guardian Industries (construction)

One of the world’s largest producers of flat glass had 2015 revenues of $5.6 billion. It employs 17,000 people around the world. Koch Industries (multicompany), which owns part of Guardian, came in at No. 2 with $100 billion in revenue and 100,000 employees.

No. 158: Aleris (materials)

The manufacturer of aluminum rolled products for building, construction and other industries recorded $2.92 billion in revenues with 5,200 employees.

Two other companies with ties to the glass industry also made the list:

No. 184: Andersen Windows and Doors (construction)

The manufacturer of doors and windows had 2015 revenues of $2.4 billion. It employs 9,000 people.

No. 150: Infor (IT Software and Services)

The maker of business-specific software produces products used in the door and window industry. Its revenue in 2015 was $3 billion and it employs 14,000 people.

*The list included 26 companies in the “construction” category.