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Alex B

Point-in-time data for quant research: SEC filings, government records and alt data, made backtest-safe. Entity resolution, data quality, open-source tools. Self-taught, building in public.

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Alt Data Forge

Defense contract awards looked like a 10% edge. It was the sector.

Defense contract awards looked like a 10% edge. It was the sector.

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3 min read

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A vendor bar for a day nothing traded - why our completeness check was 97% wrong

A vendor bar for a day nothing traded - why our completeness check was 97% wrong

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3 min read
How do you know your company matching is right? We had to grade the grader

How do you know your company matching is right? We had to grade the grader

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3 min read
Why your AI agent gets fund holdings wrong: the SEC's "Ticker" field isn't a ticker

Why your AI agent gets fund holdings wrong: the SEC's "Ticker" field isn't a ticker

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3 min read
One developer, one year, 1.8 billion rows: a point-in-time alternative-data platform

One developer, one year, 1.8 billion rows: a point-in-time alternative-data platform

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3 min read
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