In October, Patterson-UTI Energy Inc., Houston, (Nasdaq: PTEN) had 283 rigs in operation, 270 in the U.S. and 13 in Canada compared with 281 in September—268 in the U.S. and 13 in Canada. The company has 350 marketable land-based drilling rigs in its fleet. Patterson-UTI has onshore contract-drilling operations across North America.—JAS