NFX

NFX is a venture capital fund founded by Israeli entrepreneur Gigi Levy-Weiss, known for its network-effects investment thesis. The fund has increasingly focused on Israeli defense tech startups, recognizing the sector's rapid growth following the October 2023 conflict.

In May 2025, Calcalist reported that NFX led a $20 million seed round for Line 5, an Israeli defense startup focused on autonomous systems. This investment represents one of the largest defense tech seed rounds in Israel and signals NFX's commitment to the sector.

NFX's investment approach in defense tech leverages its network-effects expertise to identify startups whose technologies create defensible advantages through ecosystem integration, data network effects, and platform dynamics. The fund brings Silicon Valley scaling expertise to Israeli defense companies navigating international expansion.

The fund operates from offices in Tel Aviv and San Francisco, providing portfolio companies with access to both Israeli defense establishment connections and US defense/intelligence market access. This dual presence is particularly valuable for Israeli defense startups seeking to enter the US market through DIU, AFWERX, and other innovation pathways.

NFX's defense portfolio strategy focuses on autonomous systems, AI-enabled decision support, and sensor fusion technologies where network effects can create sustainable competitive advantages.