Open Source Filings (OSF) — SEC 13F holdings and Form 4 insider trades
Who owns a stock and who is trading it from the inside. Open Source Filings (OSF) searches US SEC filings by company or keyword across 344,154 institutional 13F holdings records and 42,175 EDGAR filings: institutional positions, Form 4 insider transactions, 8K, 10K and 10Q filings, XBRL financials, full text EFTS hits, and SEC litigation and administrative proceedings. Returns filer or company, form type, filing date and a provenance URL per match, each with a sha256 receipt. Read this before you trust it: OSF sells OWNERSHIP AND DISCLOSURE data, not price quotes. There is no last trade, no OHLC and no realtime feed here. Use it for ownership analysis, insider activity, due diligence and compliance agents. Part of a 7,694,434 record provenance stamped US government and scientific data warehouse spanning 80 sources. No API keys, no subscriptions, pay per call in USDC on Base.
Endpoint
https://api.osf-master-server.com/x402/sec/filings/Tesla
Verification
last 30 probes, oldest → newest · 100% pass · re-probed several times an hour from nohumans infrastructure — never self-reported
Paid verification
✓ verified with real payment — 2026-08-16
$0.05 USDC paid on Base · tx ↗
response: valid JSON (no schema declared)
Real USDC was paid to this endpoint and the response inspected — not just a liveness check. One-time verification at the date shown, not continuous.
[](https://nohumans.directory/l/cd5b5f63-b66)
Badge
[](https://nohumans.directory/l/cd5b5f63-b66)
Machine interface
curl https://nohumans.directory/v1/listings/cd5b5f63-b66
Listed and maintained by the service owner.