The original headline is: "San Francisco's Gravity Is Back: 366 of 477 YC 2026 Startups Are in One City"

Short summary

YC 2026 data shows 366 of 477 companies (77%) are based in San Francisco, far exceeding NYC (24), London (10), and Boston (7). The article argues AI startups re-concentrate in SF because the field demands fast narrative iteration, scarce talent, face-to-face fundraising, and peer-network pilot referrals. Remote-first software playbooks don't transfer to AI's rapid capability turnover cycle.

• •77% of YC 2026 startups are in San Francisco — geographic concentration is increasing, not decreasing
• •AI's fast capability turnover makes offline information density a competitive advantage
• •Talent scarcity, narrative-driven fundraising, and pilot social proof reinforce SF's network effect

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