Lockheed Martin is one of the worst stocks on the S&P 500 todayDefense stock Lockheed Martin Corp (NYSE:LMT) was last seen down 8.4% at $422, after the company recorded a$1.6 billion in loss attributed to its classified programs, cutting deeply into second-quarter profits. The maker of the F-35 fighter jet also trimmed its 2025 profit outlook by 25%. On the charts, the $420 level appears to be keeping today's pullback in check -- as it did in both April and February. LMT is down 12% since the start of 2025 ...