Observed arrival · 2026-10-18

Stampfile puts SEC filing times on the backtest clock

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Editorial interest 78/100 Selection signal · not a rating of the site

Stampfile sells downloadable SEC datasets with filing acceptance times and the first market session when each event could have been traded.

Landing page captured for the 2026-10-18 issue.

For: Researchers and traders building SEC-based backtests
Worth noticing: Its security master includes 8,208 delisted companies, while ticker history records 30,807 dated name changes.

Field notes

The homepage separates 8-K items into event rows and lists categories such as earnings, M&A, leadership changes, and distress. It also describes ticker-to-company intervals and former-name records, giving backtests more than a current ticker lookup. Stampfile says large tables are split by year and rebuilt on weekday mornings; the page offers sample downloads as CSV while describing the full delivery format as Parquet.

Observed signals

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

$PaidCommerce or pricing visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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