Shield Capital Research
Investment Thesis
Shield Capital invests in entrepreneurs building technologies that matter at the convergence of commercial technology and national security. The firm concentrates on four core sectors: artificial intelligence, autonomy, cybersecurity, and space. Its team is built around "veteran investors, founders & national security leaders," pairing traditional venture operators with a deep bench of former senior defense and intelligence officials. The firm's public positioning ("Mission Matters at SHIELD") emphasizes backing dual-use technology companies whose commercial products also serve national security customers, rather than pure government contractors.
Sector Focus
Shield Capital's four stated pillars are:
- Artificial Intelligence - AI-native platforms, including for human-machine teaming and operator augmentation
- Autonomy - autonomous systems spanning air, land, sea, and space (drones, maritime vehicles, space logistics)
- Cybersecurity - both enterprise and government-facing cyber defense, cyber-physical security, and AI security
- Space - space situational awareness, space-based sensing/imaging, and orbital logistics
The portfolio skews heavily dual-use: companies that sell into commercial markets while also serving Department of Defense and intelligence community customers.
Stage Focus
Shield Capital is an early-stage investor, primarily Seed through Series A/B, with selective follow-on participation in later rounds of existing portfolio companies (e.g., its Series B follow-on in mPower Technology).
Check Size
Typical initial check size ranges from roughly $1M to $15M, scaling with round size and conviction. Recent disclosed rounds include a $20M Series A lead (SiFly) and a $65M Series A co-lead (Star Catcher), indicating willingness to write larger checks into later, more capital-intensive space and hardware rounds.
Lead Tendency
Shield Capital frequently leads or co-leads its rounds. Of the investments disclosed in its 2025-2026 newsroom, it led SiFly's Series A, co-led Star Catcher's Series A (with B Capital and Cerberus Ventures), led Autonomous Cyber's seed round, and co-led UForce's seed round (with Lakestar).
Recent Activity
Shield Capital has been actively deploying through 2025-2026:
- August 2026: Led a $20M Series A in SiFly
- May 2026: Co-led a $65M Series A in Star Catcher (space-based power) with B Capital and Cerberus Ventures
- May 2026: Led a seed round in Autonomous Cyber, an AI-native platform for human operator augmentation
- March 2026: Co-led a seed round in UForce with Lakestar, supporting the European industrial base
- May 2025: Follow-on participation in mPower Technology's $21M Series B (space solar power)
- February 2025: Led a $10M round in Seasats, an autonomous maritime systems company
The firm closed its inaugural fund, Shield Capital Fund I, L.P., at $186M in October 2023 (55% above its original $120M target), and reports over $300M in total assets under management. No successor fund had been publicly announced as of this research.
Portfolio Highlights
Shield Capital's portfolio spans roughly 35+ companies across its four pillars, including HawkEye 360 (space-based RF geolocation), Armada (edge AI infrastructure), Snorkel AI (AI data development platform), Vannevar Labs (defense/intelligence data analytics), Elroy Air (autonomous cargo aircraft), Authentic8 (secure browser isolation), Unstructured (unstructured data ingestion for AI), Nexla (data integration), Dedrone (counter-drone detection), Starfish Space (in-space servicing/logistics), Albedo (very low earth orbit imaging), Overwatch Imaging (airborne ISR sensing), Vorlon Security and Knostic (AI/data security), Pillar Security (AI application security), mPower Technology (space solar power), and Seasats (autonomous maritime vehicles).
Team
Shield Capital was co-founded by Philip Bilden (former HarbourVest executive) and Raj Shah (former F-16 pilot and founding Managing Partner of the Defense Innovation Unit's commercial arm). The investment team includes Partners Michael Brown and John Serafini, Operating Partner Pat O'Reilly, Principals Akhil Iyer and David Rothzeid, Vice President Maggie Gray, and Associate Matt Kaplan. The firm is supported by a large operating and investor-relations bench (COO Dan Holland, fractional CFO David DeRuff, and a capital formation/IR team), plus a roster of Venture Partners including Ray Rothrock, Jillian Manus, Lou Manousos, JJ Jack, Matt Scullin, and recently retired Air Force Lieutenant General Dan "Razin" Caine.
Beyond the core team, Shield Capital maintains an unusually senior National Security Advisory Board, including Gen. Charles Q. Brown Jr. (Ret.), former Chairman of the Joint Chiefs of Staff; LTG H.R. McMaster (Ret.), former National Security Advisor; ADM James Stavridis (Ret.), former NATO Supreme Allied Commander Europe; Gen. David Goldfein (Ret.), former Air Force Chief of Staff; Hon. Sean Stackley, former Acting Secretary of the Navy; and Letitia (Tish) Long, former Director of the National Geospatial-Intelligence Agency. This roster is a distinctive part of Shield Capital's value proposition to founders selling into government and defense markets.
Decision Process
Shield Capital operates as a multi-partner investment team (Bilden and Shah as co-founders alongside Partners Brown and Serafini), consistent with a partnership-style decision process rather than a solo-GP structure.
Founder Preferences
Shield Capital's public messaging and advisory bench suggest a strong preference for founders building genuinely dual-use technology - products with real commercial traction that also address national security missions - rather than founders solely pursuing government contracts. Many portfolio founders have technical or operator backgrounds relevant to defense, aerospace, or cybersecurity.
Geographic Focus
Shield Capital is headquartered in the San Francisco Bay Area and invests primarily in US-based dual-use technology companies, with at least one disclosed European investment (UForce, co-led with Berlin-based Lakestar) supporting the European industrial base.