The world’s largest owners of offshore drilling rigs fell the most in more than a month as oil’s drop below $40 extended their pain. Diamond Offshore Drilling Inc. fell 5.7 percent to $21.42 at 12:22 p.m. in New York after earlier dropping as much as 7.4 percent, the worst intraday tumble since May 9. Competitors Transocean Ltd., Ensco Plc and Noble Corp. all had their biggest intraday fall since July 5. Start your day with what’s moving markets. Get our markets daily newsletter. Business Your daily briefing on the most important business stories of the day. You will now receive the Business newsletter Politics The latest political news, analysis, charts, and dispatches from the campaign trail. You will now receive the Politics newsletter Pursuits What to eat, drink, wear and drive – in real life and your dreams. You will now receive the Pursuits newsletter Game Plan Advice nobody […]