Find deep value and squeeze set-ups across every US stock.
Plumb reads the financial statements, short interest and insider trades of every US company and scores each one: how cheap it really is, how much pressure short sellers are under, and whether insiders are buying. Every score comes with its reasons.
Plumb is a research and screening tool, not investment advice. Its scores summarise public information; they are not recommendations to buy or sell any security and do not predict prices. Low-priced, heavily shorted and OTC stocks are highly risky and can lose most or all of their value. Data comes from third-party sources and may be delayed, incomplete or wrong; always read the company's latest filings. Plumb is not affiliated with or endorsed by the SEC, FINRA or Yahoo.
Free official data. Measured, not guessed.
Some of the most dramatic stock moves start the same way: a company trading for less than the cash in its bank account, a large share of its stock sold short, and insiders quietly buying. Finding that combination usually means expensive data terminals. Plumb does it with free, official data.
To plumb is to measure depth. Plumb is strict about data quality: a stock with stale filings, a stale price or figures that don't add up is kept out of the screens and labelled with the reason, so bad data never shows up as a fake bargain.
How it scores.
Four scores, each with every point shown. The Plumb score combines them.
Is it priced below what it plainly owns? Cash after all liabilities against market value, Graham's net-net test, price to book, sales and free cash flow.
The share of stock sold short, days to cover, rising short interest, a small share count and fresh activist stakes.
Officers and directors buying on the open market with their own money, especially several at once.
The value-trap filter. Heavy dilution, cash running out, financial distress and thin trading all cost points.
Plumb score = 40% Value + 30% Squeeze + 15% Insider + 15% Safety
What's inside.
Every US stock, every day
All Nasdaq, NYSE, NYSE American and OTC names, about 18,000+ tickers including OTC, refreshed in the background.
Value you can verify
Cash after all liabilities, net current assets, book value and free cash flow, taken from companies' own SEC filings.
Squeeze set-ups
Short % of shares, days to cover and short-interest trends from FINRA, plus a small share count and activist 13D stakes.
Insider buying that matters
Only real open-market purchases count; grants, option exercises and pre-planned trades are excluded.
Value-trap filter
Dilution, cash burn, Altman Z'' distress, negative equity and illiquidity are flagged in red.
Nine ready-made screens
Value + squeeze, top scores, cash > market cap, Graham net-nets, below book, most shorted, insider buying, activist stakes and your watchlist.
Every score explained
A plain-English breakdown of every point, the key numbers and links to the source filings.
Strict about data quality
Stale or inconsistent data is excluded, never ranked, and the reason is shown.
Export to CSV
Take any screen into Excel or your own models.
See it in action.
Illustrative screenshots: demo data, fictional companies.
Three steps
- Install and enter your email. The SEC requires one for automated access; it only goes to sec.gov.
- Wait about 5 to 10 minutes while Plumb downloads the whole market the first time. After that it updates in the background.
- Pick a screen, click a stock, read the reasons. Star the ones worth watching.
What you'll need
- Windows
- 10 or 11, 64-bit. No administrator rights needed.
- Internet
- For the free SEC, FINRA and price data.
- The SEC requires one for automated data access.
- Data sources
- SEC EDGAR, FINRA and free public price data. Plumb is not affiliated with or endorsed by the SEC, FINRA or Yahoo.
Questions
Is this a "meme stock" picker?
No. Plumb finds stocks whose public numbers show deep value, heavy short interest or insider buying, and explains why. Whether any of them ever move is unknowable; most cheap stocks are cheap for a reason, which is why the Safety score exists.
Where does the data come from?
Companies' own SEC filings, FINRA's official short-interest reports, SEC insider and activist filings, and free public price data.
How current is it?
Prices refresh twice a day, financial statements daily and insider filings twice a day. Short interest follows FINRA's twice-monthly schedule. Plumb is a research screener, not a trading terminal.
Does it cover OTC stocks?
Yes, optionally. They're included by default and can be switched off in Settings.
Why is a stock "excluded from screens"?
Its numbers can't be trusted: the latest filing is too old, the price is stale, figures disagree between sources, or the filing doesn't add up. It's still listed under All stocks with the reason.
Does it send my data anywhere?
No. Your watchlist and settings stay on your PC, your email is only sent to the SEC, and Plumb sends no usage data.
Mac or Linux?
Windows only for now.
Coming soon.
Plumb is being finished now. Leave your email and we'll tell you the day it's ready.