AlphaSignalStack
Alternative Finance Data.
One API.
Congressional trades, 13F hedge fund holdings, SEC insider filings, social sentiment, dark pool volume — all under one roof at retail prices. Built on TimescaleDB. EU-hosted. GDPR-compliant.
Datasets
14 datasets across 5 categoriesInsider Activity
3Buys/sells by corporate insiders, role, ownership change %, 10b5-1 plan, filing delay
Stock trades by US senators and congress members, party, committee, post-trade return tracking
Quarterly portfolios of all institutional investors >$100M AUM — Buffett, Soros, Ackman and 5,000+ more
Market Structure
3Short volume %, float short %, squeeze score — detect potential squeeze setups
Off-exchange institutional activity via FINRA ADF/TRF — dark pool prints as positioning signal
Aggregated calendar: earnings dates, IPOs, M&A, dividends, splits, shelf registrations
Sentiment & NLP
3Sentiment score (-1 to +1), mention count, velocity, volatility, bear/bull ratio from Reddit WSB/stocks/investing
NLP analysis of earnings call transcripts — CEO/CFO tone shifts before the market reacts
Environmental, Social, Governance scores and controversy tracker — GDPR/SFDR relevant for EU clients
Fundamentals & Macro
2PE ratio, EPS, market cap, 50/200-day averages — core valuation metrics per ticker
Fed rates, inflation, employment, GDP — FRED API data, 15+ indicators
Growth Signals
3Open positions per ticker/company/department — headcount growth as early signal
Which companies win US government contracts — strong signal for Defense, Healthcare, IT stocks
USPTO/EPO filings per ticker — R&D activity indicator, especially for Tech and Pharma