<p>Matrix Partners, a Waltham-based venture capital firm, has raised $450 million for its newest investment fund, according to a report by Fortune. Matrix generally focuses on early-stage investments. During its 30-year history, some of the firm's most successful investments have included Apple Computer, Sandisk, Veritas, Sycamore Networks, Phone.com, Starent Networks, JBoss and Gilt Groupe.</p><p><a href="http://www.dmwmedia.com/news/2013/04/16/matrix-partners-raises-450-million-for-new-fund">Keep reading...</a></p>