Silicon Valley

What it is

Silicon Valley is a technology cluster concentrated in Santa Clara County, California, extending north through San Francisco city. The name dates to 1971, coined by journalist Don Hoefler, and references the silicon semiconductor chips that defined the region's first industry wave. Today it is the world's highest-concentration venue for venture capital, software companies, AI research, and defence technology spinouts, anchored by Stanford University, UC Berkeley, and a network of specialist law, accounting, and investment firms. Core VC institutions include Sequoia Capital, Andreessen Horowitz, Khosla Ventures, Kleiner Perkins, and Y Combinator, which together have funded the majority of the world's most valuable private technology companies.

History

The modern cluster formed in 1957 when eight engineers left Shockley Semiconductor Laboratory to found Fairchild Semiconductor in Mountain View, California. Fairchild alumni co-founded Intel in 1968, establishing the VC-backed spinout model that still defines the region. Apple Computer incorporated in Cupertino in 1977; Cisco Systems and Sun Microsystems emerged from Stanford labs in the early 1980s. The dot-com boom of 1995 to 2000 drew roughly US$350 billion in global capital before the crash of 2000-01 erased approximately US$5 trillion in US market capitalization. Google's 2004 IPO and Facebook's 2012 listing marked successive recovery waves. Cloud computing from 2010, then generative AI from 2022, have been the two most recent high-growth cycles, each resetting the region's employment mix and valuation norms.

Current state

As of mid-2026, Silicon Valley's innovation metrics are near historic highs while the labor market contracts. The 2026 Silicon Valley Index (Joint Venture Silicon Valley) counted US$92 billion in venture capital deployed in 2025, with AI firms capturing US$80 billion, or 83% of regional venture dollars. California as a whole received US$191.2 billion, roughly 60% of all US VC, per the NVCA 2026 Yearbook. The region holds 312 unicorns, roughly half the US total, and 27 decacorns. GDP per worker stands at US$336,515; average wages reached US$189,000 in 2025. Employment fell 13,100 jobs (-0.8%) from 2024 to 2025. Oracle's June 2026 disclosure of 21,000 job cuts, citing AI agents now handling 94% of database administration tasks, shows how automation compresses headcount even as investment totals climb. Baseten raised US$1.5 billion at a US$13 billion valuation in June 2026 to serve 1 billion daily AI inference calls, capturing the demand for production-layer infrastructure beneath AI applications. The median single-family home price reached US$1.98 million in 2025, with regional billionaire wealth estimated at US$1.1 trillion and 1.25 million households unable to meet basic needs.

Relationships

Silicon Valley now supplies the US defence sector at a pace that outstrips traditional defence contractors. Mach Industries raised US$300 million in June 2026, backed by Sequoia Capital and Khosla Ventures, quadrupling its valuation to US$1.8 billion on autonomous weapons drone production at a 115,000 sq ft factory in Huntington Beach, California. Generalist AI closed a US$400 million Series A in June 2026 for embodied foundation models, with Nvidia and Radical Ventures participating. Gigascale Capital, formally closed at US$250 million in June 2026, applies Silicon Valley networks to physical climate technology including Commonwealth Fusion and Form Energy, led by former Meta Chief Technology Officer Mike Schroepfer.

What to watch

Three forces will define Silicon Valley through 2027. First, the AI-employment paradox: venture capital is at record levels while the 2026 Silicon Valley Index estimates 410,000 local jobs include tasks AI can automate, and regional employment has already turned negative. Second, US federal AI governance: any regulatory framework for frontier AI models will be shaped primarily by companies headquartered here, with lobbying concentrated on executive branch rule-making rather than congressional legislation. Third, geopolitical concentration risk: the cluster attracted roughly 60% of all US venture capital in 2025, making it a single point of failure for the US technology economy if export controls or talent restrictions tighten further.