FormFactor, Inc. (NASDAQ:FORM) announced today that it was added as a member of the US large-cap Russell 1000® Index, effective when the US market opens on June 29th, as part of the 2026 Russell indexes reconstitution. Membership in the Russell 1000® Index, which remains in place for half a year beginning 2026, is based on membership in the broad-market Russell 3000® Index. The stock also was automatically added to the appropriate growth and value indexes.