Sector: Platform IT Infrastructure

What This Sector Is

Platform IT covers the foundational technology stack that all other software runs on — public cloud, cybersecurity, observability + monitoring, data infrastructure, DevOps + developer tools, networking, storage, and AI/ML infrastructure. It's the largest enterprise-software category (~$600B+ global), the most innovation-heavy, and home to many of the best-performing tech stocks of the last decade (NVDA, CRWD, NET, DDOG, SNOW, MDB, PANW).

Buyers: CIO / CTO / CISO / VP Infrastructure / SRE leaders. Long sales cycles at enterprise; rapid adoption at dev-first companies. Developer-led bottom-up adoption is a defining pattern — individual developers try a tool, teams standardize, IT ratifies.

Sub-categories

Public Cloud Infrastructure (IaaS + PaaS)

The "big 3" hyperscalers dominate:

• Amazon (AMZN) — AWS, ~35% global cloud share, ~$100B+ revenue run-rate
• Microsoft (MSFT) — Azure, ~25% share, ~$80B+ run-rate (including AI-driven growth)
• Alphabet/Google (GOOGL/GOOG) — Google Cloud, ~10-12% share, ~$40B+ run-rate