July 17 (Reuters) - Travelers Companies' ( TRV ) profit

surged nearly three-fold in the second quarter, the insurance

bellwether reported on Thursday, boosted by stronger

underwriting and higher investment returns.

Insurance demand has remained strong despite economic

uncertainty, as businesses and individuals maintain or increase

coverage to protect against financial risks, natural disasters

and other potential losses.

Net written premiums, the total value of policies sold after

accounting for reinsurance, rose 4% in the second quarter to

$11.5 billion.

Catastrophe losses from hurricanes, wildfires and severe

storms are a key swing factor for insurers, with the scale and

timing of such events often sharply affecting quarterly earnings

despite efforts to price in risks and share them through

reinsurance.

Travelers posted catastrophe losses of $927 million on a

pre-tax basis in the reported quarter, compared with $1.51

billion a year earlier.

Losses were moderate despite some hailstorms, making it one

of the better quarters following a spell of elevated

weather-related claims across the industry.

The company's results often serve as a bellwether for the

property and casualty insurance sector, reflecting broader

industry trends in underwriting, pricing and catastrophe losses.

The underlying combined ratio came in at 84.7% in the

quarter. A ratio below 100 indicates that the insurer collected

more in premiums than it paid out in claims and expenses.

Travelers posted underlying underwriting income of $1.6

billion on a pre-tax basis, up 35% from a year earlier.

Stronger underwriting reflects the insurer's ability to

price risk accurately and limit losses, helping boost profits

even when claims arise.

Meanwhile, net investment income, which comes from

investments in bonds, stocks and other low-risk financial

assets, rose 6% to $942 million. These returns are a key source

of profit for insurers and help cushion the impact from natural

disasters and other large claims.

Core income climbed to $1.5 billion, or $6.51 per share, in

the three months ended June 30. That compares with $585 million,

or $2.51 per share, a year earlier.