With sales more than quadrupling in 2013, TigerText, a secure mobile messaging service for co-workers, has closed a series B funding. Shasta Ventures led the deal with corporate venturing units Reed Elsevier and Telus also taking part.

TigerText, a US secure, real-time messaging for businesses, has closed a $21m series B round of funding. The investment round was led by Shasta Ventures who was joined by OrbiMed, Reed Elsevier Ventures, and Telus Corporation, along with returning Series A investors, Easton Capital, New Leaf Venture Partners, and New Science Ventures. The latest round brings the company’s reported funding to $31.2m.

Through the TigerText app, staff and colleagues can securely message each other from any smartphone, tablet or computer…