title: How to retrieve all associated company RICs for a specified exchange RIC using the Refinitiv Eikon API?
body: <p>Using the Refinitiv (formerly known as Thomson Reuters ) Eikon Data API, does anyone know how to quickly return all associated company RICs for exchanges such as Oslo Stock Exchange?</p>
  
  <p>The RIC for Oslo Stock Exchange seems to be <code>.OSEBX</code></p>
  
  <p>And <code>eikon.get_data</code> has a few examples in the docstring:</p>
  
  <pre><code>import eikon as ek
  ek.set_app_key('set your app key here')
  data, err = ek.get_data(["IBM", "GOOG.O", "MSFT.O"], ["TR.PriceClose", "TR.Volume", "TR.PriceLow"])
  data, err = ek.get_data("IBM", ['TR.Employees', {'TR.GrossProfit':{'params':{'Scale': 6, 'Curn': 'EUR'},'sort_dir':'asc'}}])
  fields = [ek.TR_Field('tr.revenue'),ek.TR_Field('tr.open',None,'asc',1),ek.TR_Field('TR.GrossProfit',{'Scale': 6, 'Curn': 'EUR'},'asc',0)]
  data, err = ek.get_data(["IBM","MSFT.O"],fields)
  </code></pre>
  
  <p>So I've tried different variations with <code>eikon.get_data(instruments = ".OSEBX", fields = "RIC")</code>, but with no success.</p>
  
  <p>Any suggestions?</p>