query: PREFIX schema: <http://schema.org/>
  
  SELECT ?item ?itemLabel ?itemDescription ?hq WHERE {
    ?item wdt:P31 wd:Q4830453.
    ?item schema:description ?label.
    MINUS { ?item wdt:P159 ?hq. }
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
    FILTER((LANG(?label)) = "en")
    FILTER(CONTAINS(STR(?label), "company in"))
  }