General Info
Steven Sinofsky, a Board Partner at Andreessen Horowitz, is an angel investor with investments in a16z, Box, Tanium, Product Hunt, and Everlaw. His investments are typically in promising companies. Sinofsky has made investments in Local motion and Spreadsheet. He has a track record of over 20 years with Microsoft, where he was the president of the Windows division. Sinofsky’s partnership and collaboration style emphasize teamwork and horizontal integration. The investment check size for Sinofsky’s investments ranges, with examples like $90 million into a company valued at about $900 million. He is industry agnostic and invests personal money into companies for equity. Additional insights can be found on his Medium profile and various writing on different topics.
Location: Menlo Park, CA
Country: United States of America
Industries:
Investment Regions: EU, NA
Investment Stages: pre-seed, seed
angel-individual
EU, NA
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🤖 AI Activity Report
Status: very-active
AI Reasoning: I found recent public activity indicating Steven Sinofsky’s involvement with Everlaw (he publicly commented Oct 2, 2025) and ongoing board/advisory roles. The most recent known investment-related activity is within the last 6 months (Everlaw announcement/related posts in 2025), which places him in the highest activity band. The startup mentioned: Everlaw.
Angel activity thresholds:
Low Activity – Only known angel investments more than 12 months ago.
Active – Known angel investments between the last 12 and 6 months.
Very Active – Known angel investments in the last 6 months.
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