# cheapstocks

> A ticker directory, per-company balance-sheet analysis, a stock screener and a backtest
> built directly from primary sources: SEC EDGAR filings (10-K/10-K/A XBRL statements, SEC
> company facts including 10-Qs, the submissions feed and Form 3/4/5 insider data sets)
> and a daily stooq price archive. No analyst estimates and no third-party fundamentals
> vendor — every ratio is computed from the filings and the price, and links to its source.

Every company page has a markdown twin at `/t/:TICKER.md` (or send `Accept: text/markdown`
to `/t/:TICKER`). The JSON API is public, read-only and needs no key.

Coverage and limitations:

- Filings are 10-K and 10-K/A only. Amendments (10-K/A) are included as distinct filings.
  Foreign private issuers that file 20-F or 40-F instead of a 10-K are not covered.
- Financial statement figures come from each filing's structured XBRL. XBRL only exists
  from roughly 2009 onward, and a handful of filings from 2009-2011 still lack usable
  XBRL — those periods are absent rather than estimated or backfilled.
- Derived metrics are computed only from reported figures; a metric whose inputs a company
  doesn't report is shown as unavailable, never estimated. No analyst figures.
- Only companies still filing 10-Ks are covered: delisted companies drop out, so the
  screener and backtest are subject to survivorship bias. OTC-only stocks have no price data.
- Insider trades come from SEC's quarterly data sets and lag by up to a quarter.
- Daily prices are sourced from a stooq.com bulk archive and are back-adjusted for stock
  splits. Whether dividends are also back-adjusted is unconfirmed. There is no raw/
  unadjusted price column available.
- Not every listed company has a price file — only tickers matched against the stooq
  archive do. A company can have filings with no price data, or (rarely) the reverse.
- This is informational data, not investment advice.

## Pages

- [Home](https://cheapstocks.app/): a searchable directory of every US company with a 10-K on file at SEC EDGAR.
- [Company page](https://cheapstocks.app/t/AAPL): `/t/:TICKER` — daily price history with valuation multiples (P/E, P/B, P/S, P/FCF, EV/EBITDA); a balance-sheet analysis (net current asset value, net-net working capital, tangible book, common-size balance sheet, liquidity and leverage, Altman Z″, debt maturities, Piotroski F-score, Beneish M-score, accruals, revised figures, ROIC and DuPont ROE, per-share values, a reverse DCF, auditor, going-concern note, red-flag 8-Ks, late filings, 13D/13G stakes and open-market insider trades); plus the income statement, balance sheet and cash flow, merged period-by-period across every 10-K and 10-K/A the company has filed.
- [Screener](https://cheapstocks.app/screener): every active filer with the latest of those metrics, with preset screens (net-nets, below tangible book, Piotroski value, insider buying, cash yield, red flags) and CSV export.
- [Backtest](https://cheapstocks.app/backtest): the screener's balance-sheet and valuation screens replayed on every yearly rebalance since 2011, using only figures already filed on each date, with each year's holdings, returns and equal-/cap-weighted benchmarks.

## Markdown versions

- [Site overview](https://cheapstocks.app/index.md): pages, API and caveats in markdown.
- [Company page (markdown)](https://cheapstocks.app/t/AAPL.md): `/t/:TICKER.md` — company facts, JSON API links and caveats for one ticker.

## API

- [GET /tickers](https://api.cheapstocks.app/tickers): the full company directory.
- [GET /prices/:symbol](https://api.cheapstocks.app/prices/AAPL): daily OHLCV history for a ticker or CIK.
- [GET /filings/:symbol/:statement](https://api.cheapstocks.app/filings/AAPL/income_statement): merged historical income_statement, balance_sheet, or cash_flow data for a ticker or CIK.
- [GET /fundamentals/:symbol](https://api.cheapstocks.app/fundamentals/AAPL): annual and quarterly (trailing-twelve-month) derived fundamentals from SEC company facts.
- [GET /profile/:symbol](https://api.cheapstocks.app/profile/AAPL): SIC code, filer category, auditor, going-concern note and notable filing events.
- [GET /insiders/:symbol](https://api.cheapstocks.app/insiders/AAPL): open-market insider purchases and sales.
- [GET /screener](https://api.cheapstocks.app/screener): the screener's full data set.
- [GET /backtest](https://api.cheapstocks.app/backtest): point-in-time screener snapshots at each yearly rebalance date, with every company's return to the next one.

## Optional

- [Full company list](https://cheapstocks.app/llms-full.txt): this file plus every company page as a markdown link.
- [Sitemap](https://cheapstocks.app/sitemap.xml): the screener, backtest and every company page currently in the directory.