Key TakeawaysThe Travelers Companies reported a gain in second-quarter revenue and net premiums written, but they both fell short of estimates and shares declined Friday.The big insurer also saw catastrophe losses rise by $30 million because of what it called "severe convective storms."Adjusted profit was higher than forecasts. The Travelers Companies (TRV) shares dropped in intraday trading Friday as the big insurance provider missed estimates for second-quarter sales and net premiums written. The company ...