Arch Venture Partners

Money Moves

Largest shareholder, about 35% pre-IPO

City Therapeutics closed its upsized Nasdaq IPO on October 19, raising $230 million before fees after underwriters bought all 1.67 million extra shares. The Cambridge biotech sold 12.8 million shares at $18 each. Its stock rose about 24% in its October 16 debut.

Updated Oct 21

Money Moves

As of June 2026: Investor in Prometheus across both the April 2026 and June 2026 rounds

Prometheus, the AI startup co-founded by Jeff Bezos and Vik Bajaj in November 2025, emerged from stealth on June 11, 2026. The company announced a $12 billion Series B at a $41 billion valuation, backed by Goldman Sachs, BlackRock, JPMorgan, DST Global, and Arch Venture Partners. Total capital raised across three rounds now exceeds $28 billion — all in seven months.

Updated Jun 12