Travelers Cos., the lone property-casualty insurer in the Dow Jones Industrial Average, had about $224 million of energy-related bonds that were rated below investment grade as of Dec. 31.

The insurer also has $216 million in publicly traded stock tied to the industry and $343 million in private-equity energy holdings, the New York-based company said Thursday in a presentation on its website.

The combined holdings account for about 1.1 percent of the company’s investment portfolio. Travelers increased disclosure amid investor concerns about risks tied to the decline in oil prices.

“We believe the exposure to be quite manageable,” Chief Financial Officer Jay Benet said today on a conference call.