query: SELECT ?item ?revenue ?hq ?date ?prof ?emp
  WHERE
  {
      ?item wdt:P31/wdt:P279* wd:Q4830453 .
      ?item wdt:P159 ?hq . 
      MINUS { ?hq wdt:P17 wd:Q213 . }
      MINUS { ?item wdt:P749 [] . }
      ?item wdt:P127 ?owner .
      ?owner wdt:P27 wd:Q213 . 
      OPTIONAL {
         ?item p:P2139 ?revenueSt .
         ?revenueSt a wikibase:BestRank; ps:P2139 ?revenue .
         ?revenueSt pq:P585 ?date .
      }
      OPTIONAL { ?item wdt:P2295 ?prof } . 
      OPTIONAL { ?item wdt:P1128 ?emp } .
  }
  ORDER BY DESC(?revenue)
  LIMIT 20