Business: Provides Web-based management systems for physician practice groups, including billing and collections, subscriptions services and cost-reduction methods.

Headquarters: Waltham, Mass.

Founded: August 1997

VC raised to date: $46.4 million

Capital raised one year ago: $35 million

Investors: Cardinal Partners, Draper Fisher Jurvetson, Draper Richards, Venrock Associates and Oak Investment Partners

Plans one year ago: The company planned to use proceeds from the Series B round it closed last November to continue building out its infrastructure, expand its sales and marketing capabilities and ramp up its management team. Athenahealth’s investors gave it a post-money valuation of $89.5 million at the transaction’s close.

Status: Anthenahealth last month formed a strategic partnership with Siemens Medical Solutions Health Services. Siemens will sell Athenahealth’s solution to its client base of physicians. Athenahealth expects to sign on upwards of 2,000 additional physicians to its service by year-end.