Virginia-based Amentum holds an ownership stake in about 30 active joint ventures, the company said in a financial filing last week with the Securities and Exchange Commission (SEC).
Amentum’s ownership percentages in these joint ventures, typically limited liability corporations or LLCs, “range from 25% to 50%,” the company said in an SEC filing around the time it reported quarterly earnings.
“Many of our joint ventures only perform on a single contract,” Amentum said in the filing. “The modification or termination of a contract under a joint venture could trigger an impairment in the fair value of our investment in these entities. In the aggregate, our maximum exposure to losses was $218 million related to our equity method investments as of January 2, 2026.”
Amentum is part of joint ventures doing billions of dollars’ worth of business in the Department of Energy’s nuclear complex, including being lead partner in environmental contracts at the Idaho National Laboratory, the Portsmouth Site in Ohio and the Oak Ridge Site in Tennessee.