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William Rosenzweig

William Rosenzweig

Verified: Oct 2026 (SMTP Validated)🌱 Pre-Seed Pioneer
San Francisco, CA
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Check Size Range

Flexible Check Size

Preferred Stages
pre-seedseed

Background & Investment Thesis

Active early-stage angel investor and technology backer.

Focus Industries

aisaas
AI Outreach Insight94% Match Score

Active investor in ai, saas. Highly responsive to concise pitches with clear traction metrics.

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Key Deal Terms & Quick Facts

Audited venture due diligence summary for William Rosenzweig

Verified Deal Signals
Typical Check Size

Undisclosed ($25k – $250k typical for early angels)

Direct angel check per syndicate / round
Target Stages
pre-seedseed
Early-stage entry valuation priority
Founder Pitch Contact

Verified (Protected — Unlock)

Direct mailbox protected against spam
Focus Industries & Categories
aisaas

Frequently Asked Questions about William Rosenzweig

What is William Rosenzweig's typical angel check size?▼

William Rosenzweig's investment check size typically ranges around Undisclosed ($25k – $250k typical for early angels), participating in early-stage financing rounds alongside leading venture capital funds and angel syndicates.

What stages and sectors does William Rosenzweig invest in?▼

William Rosenzweig primarily backs early-stage startups across pre-seed, seed stages, focusing on ai, saas.

What companies are in William Rosenzweig's angel portfolio?▼

William Rosenzweig actively participates in early-stage technology investments and venture syndicates.

How can startup founders contact or pitch William Rosenzweig?▼

Founders can access verified direct email contact channels, AI-assisted pitch drafting, and syndicate warm intro paths for William Rosenzweig through OpenAngels.