Related Clues:

• Business orgs.
• Dow Jones listings: Abbr.
• Trig calculation
• Amex listings: Abbr.
• Orgs. with 'Inc.' in their names
• Funny Bill's nickname
• Romaine variant
• Romaine lettuce, alternately
• 'I Spy' co-star Bill, familiarly
• ___ lettuce (romaine)
• "Cliff Huxtable," to pals
• Inc. article subjects
• NASDAQ listings
• Romaine's other name
• Funnyman Bill's nickname