Thoma Bravo, a private equity investment firm focused on the software sector, agreed to invest in PDFTron, a provider of document technology solutions for software developers. Existing investors Silversmith Capital Partners and the PDFTron management team will remain significant shareholders. Financial terms were not disclosed. "Partnering with Thoma Bravo a short two years after our first external investment from Silversmith is validation of our category leadership, focus on innovation, and the scale of the market opportunity ahead of us. Thoma Bravo shares our commitment to deeply understanding our market and anticipating customer needs to fuel further product innovation. We look forward to sharing the benefits of their software expertise and investment capital with our clients, partners, and employees," Catherine Andersz, PDFTron CEO.