Bastille

Bastille sells what it calls Wireless Airspace Cybersecurity — a network of software-defined radio (SDR) sensors that continuously scans a facility’s RF spectrum to detect, locate, and classify every Bluetooth, BLE, Wi-Fi, cellular, and IoT-emitting device in range, whether or not that device ever touches the wired network. The pitch is a real architectural gap: firewalls, EDR, and network access control all assume an attacker’s path runs through a monitored network segment, but a rogue Bluetooth tracker, an unauthorized personal hotspot, or a cellular-connected implant bypasses that entirely. Bastille’s founding team, including CTO Bob Baxley (signals intelligence background at the NSA), built the company around closing that blind spot.

The platform has expanded from general enterprise and government wireless intrusion detection into a specific, well-timed use case: monitoring the airspace around AI data centers, where a wireless bridge smuggled past physical security controls could exfiltrate data or bypass air-gapping assumptions entirely. Bastille announced a partnership with Oracle in 2026 to deploy RF sensors around AI data center facilities, using its detection engine to classify transmissions by type and flag unauthorized devices in real time.

Bastille has raised roughly $97 million across multiple rounds, including a $44 million Series C in January 2024 led by Goldman Sachs Asset Management, and operates with a headcount in the 75-100 range. In March 2026 it published its first annual "State of Wireless Security" report, a self-authored piece of research aimed at establishing category leadership in a niche — wireless/RF threat detection — that has few direct, well-funded competitors.

The company’s core bet is that as BLE trackers, wearables, and wireless-connected IoT proliferate inside secure facilities, the RF attack surface will keep growing faster than most security architectures account for, and that Bastille’s SDR-based sensor network is a more scalable answer than the Wi-Fi-only WIDS/WIPS features bundled into enterprise access points.