Oil & Gas Drilling companies

9 US-listed companies file under Oil & Gas Drilling.

The 9 most heavily traded of 9 companies filing under Oil & Gas Drilling
Company	Files under
RIG Transocean Ltd.	Oil & Gas Drilling
PTEN PATTERSON UTI ENERGY INC	Oil & Gas Drilling
HP Helmerich & Payne, Inc.	Oil & Gas Drilling
NE Noble Corp plc	Oil & Gas Drilling
BORR Borr Drilling Ltd	Oil & Gas Drilling
SOC Sable Offshore Corp.	Oil & Gas Drilling
SDRL SEADRILL Ltd	Oil & Gas Drilling
NBR NABORS INDUSTRIES LTD	Oil & Gas Drilling
PDS PRECISION DRILLING Corp	Oil & Gas Drilling

Industry is as each company files it with the SEC.

Families group the sub-industries a filer can choose between, so Oil & Gas Drilling covers every variant inside it rather than splitting into a page per variant with two companies on each. The order is by what actually trades, price times volume on the latest stored bar, rather than by market capitalisation: that figure is derived from a filer-supplied share count which is sometimes wrong by orders of magnitude, and a ranking built on it puts those errors at the top.