'Roarke Enterprises' seems to be used interchangeably with 'Roarke Industries'. Whether or not it is a separate branch of Roarke Industries is unknown.
Additional Note: On the inside cover of the US paperback edition of Divided in Death (ISBN 0-425-19795-6) it reads:
"Reva Ewing was a former member of the Secret Service, and then a security specialist for Roarke Enterprises - until she was found standing over the dead bodies of her husband ..."
Throughout the book, however, it is stated that Reva works for Roarke Industries, that the Securecomp contract is held by Roarke Industries, et cetera. This may (or may not) be additional indication that the names are used interchangeably.
The following companies are owned by Roarke Enterprises:
- From Strangers in Death, "It was interesting, but not surprising, that Anders Worldwide's New York Headquarters were housed in the sleek black tower on Fifth. Roarke Enterprises' New York headquarters also housed its base there and owned ever inch of that sleek black tower."