"schmitz und co" refers to several business entities mostly in Germany, typically companies with the name "Schmitz & Co." or similar.

• One example is Schmitz & Co. Immobilien-Verwaltungs-GmbH, a family-run real estate management company in Germany, where family members take personal responsibility and cater to individual client needs.

• Another Schmitz & Co. Evers GmbH specializes in leather and foil products including sustainable materials for shoes, furniture, and automotive industries.

• Schmidt & Co GmbH, founded in 1990, operates in Mecklenburg-Vorpommern and deals with agricultural machinery repair and supply.

The phrase itself is German: "und" means "and" in English, and "Co" is an abbreviation for "Company." So "Schmitz und Co" literally means "Schmitz and Company" in English and is a common company name structure in German-speaking countries. If you meant a specific Schmitz & Co., please specify the industry or location for a more pinpointed explanation. Otherwise, it is a business naming convention used widely in Germany across various sectors.