Finjan Holdings | 849 followers on LinkedIn. Finjan Holdings (NASDAQ:FNJN), founded in 1996, is a technology company committed to enabling innovation. The Company’s engineers and developers’ pioneered behavior-based, real-time detection of online threats by identifying patterns and expected behavior of code and content rather than relying solely on “signatures” of existing and already known threats. Having such valuable assets, we have invested considerable time, effort and resources to secure our inventions with U.S. and foreign patents.