The investment also raises the stakes as Rivian prepares to take on Tesla, which produces S.U.V.s as well as sedans and last month announced plans for what it is calling the Cybertruck.

Analysts have said Rivian’s truck is aimed more at recreational activities than at work use. Its truck is shorter than the best-selling Ford F-150. Ford, which invested $500 million in Rivian earlier this year, has said it will release a hybrid F-150 next year and is working on an all-electric version.

Amazon, which led a $700 million investment round in Rivian in February, is collaborating with the company to develop an electric delivery van. Rivian said Monday that Amazon had ordered 100,000 of the vans and that it expected to start delivering them in 2021. The vans would presumably become part of an end-to-end logistics network that Amazon has been working on since 2015.

A Rivian representative declined to specify the company’s valuation based on the latest investment. The investment is T. Rowe’s first in the company. No new board seats were added as a result of the investment, Rivian said.

As a private company, Rivian does not release financial data that would reflect its progress. As Tesla has shown, building new facilities can take far longer than expected and consume huge amounts of cash. But if Rivian manages mass production of popular vehicles without significant problems, it could establish itself as a competitor to Tesla.