Why accession-number pinning is the whole product

2026-08-18

EDGAR is content-addressed by accident of regulation: an amendment gets its own accession number rather than overwriting the filing it amends. Most tooling ignores this and serves "the latest version", which means an amended 10-K can silently rewrite data your analysis thought it saw at the time, and you find out much later, if at all.

Everything this service returns can be pinned to an exact accession number. A diff computed last quarter still means the same thing this quarter, and a backtest that keys off anything fundamental stays point-in-time honest: the past cannot be quietly revised to flatter the present.

The failure this prevents is not hypothetical. The first user who described their EDGAR workflow to us reported that the server they used "served the latest amendment, silently invalidating my baseline", and that pinning alone would have saved them a week of baseline-tracking. That sentence is the product.

Computed with the Signal Nodus MCP server: 10-K and 10-Q section extraction and sentence-level diffs, pinned by accession number, priced per call. Company lookup is free and needs no key: https://mcp.signalnodus.ai/. Pricing - More research