Hi,
For US listed stocks we have a database of CUSIPs... this includes stocks listed on the NASDAQ Global Select market.
It seems when using get_symbology from='CUSIP', it will return no results. An example is MHLD US Maiden Holdings which has a CUSIP (International Number, CIN): G5753U112.
The security does pop up in Eikon search. Looking using DIB function within Eikon, it seems G5753U112 is not in the TR.CUSIP field, but rather CUSIP (Extended/CIN) (TR.CUSIPExtended or TR.CinCUSIPCode).
I am able to get MHLD using CUSIP G5753U112 from send_json_request instead, but it may be worth supporting CUSIP CINs in get_symbology?