# TradeStar Insider — Insider Buy Signals

> Filing-verified U.S. insider open-market purchase signals parsed from SEC EDGAR
> Form 4 filings. We keep only two well-defined kinds of open-market buy — cluster
> buys (two or more insiders in one company within seven days) and buys large relative
> to the insider's existing holdings. This is a clean, filing-verified filter over
> public purchases, not a return prediction: we tested whether these filters precede
> price moves over our own history and could not find a return edge distinguishable
> from base rate, so we don't claim one. Every returned field (shares, price, USD value,
> percent vs. holdings) is parsed from a real filing and ships with a link to that
> filing on sec.gov. Records that cannot be linked to a filing are dropped, never
> guessed. No scores, no unsourced numbers.

Data coverage: 2026-01-20 to 2026-09-28 — 175 U.S. trading days, every one covered (no gaps in the window; market holidays such as Presidents' Day carry no filings and are not gaps). Grows every U.S. trading day. Source: SEC EDGAR Form 4.
Information, not investment advice, and not a return forecast. We sell verified filings, not predictions.

## Programmatic access

- [REST API — OpenAPI 3.0.2 contract](https://api.tradestarinsider.com/v1/openapi.json): JSON over HTTPS, versioned under /v1. Metered plans on RapidAPI; free Basic tier (3,000 req/month).
- [MCP server (Streamable HTTP)](https://mcp.tradestarinsider.com/mcp): open, free, per-IP rate-limited. Add to Claude: `claude mcp add --transport http insider-signals https://mcp.tradestarinsider.com/mcp`
- [MCP server card](/.well-known/mcp/server-card.json): name, description, tool list.

## MCP tools

- `insider_signals_today`: Rule-2 insider-buy signals filed today (SEC code P open-market purchases). Returns the newest 25 by default (set `limit`; page with `offset`); the response's `total_matched` reports the full count. Optional `days`/`ticker` filters. Each record carries its source filing_url.
- `insider_signals_by_ticker`: All Rule-2 insider-buy signals for one ticker (case-insensitive). Returns the newest 25 by default (set `limit`; page with `offset`; optional `days`); `total_matched` reports the full count. Each record carries its source filing_url.
- `insider_signals_by_date_range`: Rule-2 insider-buy signals filed within an inclusive ISO date range. Returns the newest 25 by default (set `limit`; page with `offset`; optional `days`/`ticker`); `total_matched` reports the full count. Each record carries its source filing_url.
- `insider_cluster_buys`: Rule-2 cluster buys only (>=2 insiders buying the same issuer in-window) — the highest-signal subset. Each row carries `uniform_price_cluster`: true when >=3 distinct insiders bought at the IDENTICAL price on the same filed_date for the same issuer — the fingerprint of an offering/conversion (one administered price), NOT independent open-market conviction. Note Form-4 code P covers open-market purchases AND some offering/conversion purchases filed under P; this flag marks the latter. Genuine clusters rank ABOVE uniform-price ones. Returns the newest 25 by default (set `limit`; page with `offset`; optional `days`/`ticker`); `total_matched` reports the full count. Each record carries its source filing_url.
- `insider_filing_lookup`: The single Rule-2 record for one SEC filing accession, with its filing_url. Returns an error if no gated filing matches the accession.
- `federal_awards_recent`: Recently signed U.S. federal new awards from USAspending.gov, newest first. Returns the newest 25 by default (set `limit`; page with `offset`); `total_matched` reports the full count. Optional min_amount (USD floor) and `days` (last-N-days window). Every award carries its source award_url; awards without a source link are dropped and never returned.
- `activist_stakes_recent`: Recent activist Schedule 13D / 13D-A filings on US-listed companies, newest first then by stated-intent strength (control/take-private > board/proxy > strategic/value, or none stated). Returns the newest 25 by default (set `limit`; page with `offset`); `total_matched` reports the full count. Optional min_percent (percent-of-class floor), ticker, and `days` (last-N-days window). Every stake carries its source filing_url; filings without a source link are dropped.
- `fund_position_changes`: What large institutional filers CHANGED quarter-over-quarter in their SEC 13F-HR holdings (opened / added / trimmed / exited a position) — the delta is the product; the raw snapshot is only the input. Every row carries as_of_quarter_end, filed_date and lag_days (values are up to ~45 days stale), value_usd in whole dollars, cusip + issuer_name, and its source filing_url. ticker is null (no authoritative free CUSIP->ticker source; never guessed). A missing prior quarter is the explicit state 'first_filing_on_record', not 'everything new'. Covers LONG US 13(f)-listed positions only — no shorts, non-US, or options. UNIVERSE: the fifty largest 13F filers by reported value as of the latest quarter, re-ranked quarterly. Because it is ranked BY REPORTED VALUE, the head is the biggest asset managers (BlackRock, Vanguard, State Street, Fidelity, ...) whose quarter-over-quarter changes largely reflect index rebalancing, not conviction; the feed reports WHAT WAS FILED, not what it means, and does not tag any manager active or passive (that would be inference). Coverage is PER SEC CIK, not per brand: a firm filing under several CIKs appears as several entries, and when a filer's 13F moves to a new CIK, historical coverage stays attached to the CIK that filed it. This is a convenience/completeness view of public data, NOT a trading edge. Returns the newest 25 by default (set `limit`; page with `offset`); `total_matched` reports the full count. Optional filer, change_type, min_value_usd, and `days` (last-N-days window).
- `verify_insider_purchase`: Check a claim about an insider open-market buy (ticker/issuer, person, amount, timeframe) against the filed record. Returns status=confirmed with the source filing(s) + link; not_found; partial (same insider/company but value/date differs, itemised claimed-vs-filed); out_of_scope (sales/options/grants aren't covered); or out_of_coverage (outside the collected window). Every response states the coverage window checked. Rule-2: no estimates, no unlabelled partial matches — absence is reported as absence, never guessed.
- `verify_activist_13d`: Check a claim about an activist stake (ticker/subject, filer, percent-of-class, stated intent, timeframe) against the filed Schedule 13D/13D-A record. Returns status=confirmed with the source filing(s) + link; not_found; partial (same filer/subject but percent/intent/date differs, itemised claimed-vs-filed); out_of_scope (passive 13G isn't covered); or out_of_coverage (outside the collected window). Every response states the coverage window checked. Rule-2: no estimates — absence is reported as absence, never guessed.
- `verify_8k_event`: Check a claim that a registrant (cik/company/accession) filed an 8-K carrying specific SEC item code(s) in a timeframe, against the filed record. Returns status=confirmed with the source filing(s) + link; not_found; partial (same registrant/filing but the claimed item(s) aren't carried, or the date differs — itemised claimed-vs-filed); out_of_scope (claims about the body's meaning/materiality aren't covered — the filing is never paraphrased); or out_of_coverage. Every response states the coverage window checked. Rule-2: item codes are the SEC controlled vocabulary parsed from the filing — never inferred from prose.
- `verify_13f_holding`: Check whether a fund (filer name/CIK) HELD an issuer (issuer_name or cusip) as of a quarter, against the filed 13F-HR record. Returns status=held with the source filing(s) + link; not_held (the fund reported the position EXITED that quarter — a filed 'no', distinct from not_found); not_found (no such row in the covered window); or out_of_coverage (the claimed quarter is outside the collected as-of window). Every response states the coverage window checked. Rule-2: LONG US 13(f) positions only, values are as-of quarter-end and up to ~45 days stale, and ticker is never guessed — match on issuer_name or cusip.

## Pages

- [Landing / what it is](https://www.tradestarinsider.com/): what the data is, a live sample, pricing, add-to-Claude.
- [How to check insider purchases with an AI assistant](https://www.tradestarinsider.com/docs/insider-buys-with-ai.html)
- [How to verify a financial claim against a filing](https://www.tradestarinsider.com/docs/verify-a-claim.html)
- [Fund position changes from SEC 13F filings](https://www.tradestarinsider.com/docs/fund-position-changes.html)

# Generated 2026-09-28 from the live serving store. Coverage reflects real data on disk.