Watertown-based athenahealth laying off about 500 employees

An athenahealth worker processed paperwork. –Pat Greenhouse/Globe Staff/File

Athenahealth Inc., the digital health care services company in Watertown, is eliminating about 500 jobs as part of a cost-cutting plan detailed Thursday in the face of pressure from an activist investor.

The company said the job reductions would amount to 9 percent of its workforce, but it did not say how many of the cuts would be in Watertown, where it is the largest employer.

Athenahealth, which has about 5,600 total employees, also plans to close two offices, in San Francisco and Princeton, N.J. Its other locations are in Belfast, Maine; Austin, Texas; Atlanta; and India.