Lockheed Martin Corporation (NYSE:LMT) is among the 7 Best Defense Dividend Stocks to Buy. On December 19, JP Morgan downgraded the stock’s rating to Neutral from Overweight, citing concerns about the defense contractor’s long-term cash flow estimates. JP Morgan Downgrades Lockheed Martin Corporation (LMT) Citing Cash Flow Concerns Jordan Tan / Shutterstock.com Analyst Seth Seifman told investors in a research note that pension-related outflows expected next year were likely to limit cash flow growth, m ...