fin-sig

Capital Intelligence Platform

Philanthropists fund reality 2–5 years before consensus pricing. fin-sig surfaces those early signals from SEC 13F filings — for free.

Signal Scoring Convergence Detection Open API & Export

Open Dashboard API Docs Read the Blog Post

Tracked Funders6

Data Sources4

Running Cost$0

API AccessFree

Live Dashboard

Real-time signal scores, funder activity, and convergence events from SEC 13F filings.

Open Full Dashboard

How It Works

Three-dimensional signal scoring from public data sources.

Confidence (40%)

Data quality and position size relative to portfolio. Higher weight = higher conviction signal.

Novelty (30%)

How recently the position changed. New entries and major increases score highest.

Convergence (30%)

Multiple unrelated funders moving on the same theme. The strongest alpha signal.

Tracked Funders

Institutional investors and mission-driven capital tracked across multiple data sources.

Gates Foundation Trust

SEC 13F

Global health, climate infrastructure, education technology

Berkshire Hathaway

SEC 13F

Value investing, insurance, energy infrastructure

Chan Zuckerberg Initiative

SEC 13F

Education, biomedical research, housing

Emerson Collective

Public Portfolio

Education, immigration, climate, media ventures

Open Philanthropy

Grant Database

AI safety, biosecurity, global health, animal welfare

Ford Foundation

IRS 990-PF

Social justice, democratic governance, economic equity

Embeddable Widgets

Drop fin-sig signals into any webpage. Shadow DOM isolation, zero style conflicts.

Signal Card

Score gauge with sub-score breakdown and funder list

Convergence Badge

Inline badge showing multi-funder alignment events

Timeline Sparkline

SVG portfolio value chart for any tracked funder

Embed in Your Site

<!-- Drop this anywhere on your site -->
<script type="module"
  src="https://jenninexus.com/fin-sig/widgets/finsig-widgets.js">
</script>

<finsig-signal-card
  data-theme="climate-infrastructure"
  data-api="https://jenninexus.com/fin-sig">
</finsig-signal-card>

Tech Stack

Python + FastAPI
Async backend with auto-generated API docs
SEC EDGAR API
Free public data, no API key required
Deterministic Scoring
Pure Python math — no black box, fully auditable
Preact + Shadow DOM Widgets
Self-contained ESM bundle, zero conflicts
Built with Claude
Entire codebase developed with Claude Code

API Endpoints

`GET`	`/fin-sig/api/signals`	All scored signals
`GET`	`/fin-sig/api/funders`	Tracked funders
`GET`	`/fin-sig/api/convergence`	Cross-funder overlap
`GET`	`/fin-sig/api/diffs/{id}`	Quarter-over-quarter
`GET`	`/fin-sig/health`	Health check
`GET`	`/fin-sig/docs`	Swagger UI
`GET`	`/fin-sig/redoc`	ReDoc

All endpoints return JSON. No authentication required. CORS enabled for widget embeds.

Swagger ReDoc Raw JSON

Start Tracking Capital Signals

Free dashboard, open API, embeddable widgets. No signup required.

Open Dashboard Explore the API