You see it every day. Someone on Reddit, X, or a newsletter says a stock has the best margins in its sector, or trades cheaper than its peers, or has a bulletproof dividend. It sounds confident. Checking whether it is actually true means pulling the company and every rival by hand, so most people skip it and take the claim on faith. Here is the faster way.
The twenty-minute problem
A claim is easy to say and slow to check. "Company X has the best margins in its sector" means looking up X, finding its peers, pulling the same metric for each one, and lining them up. Twenty minutes later you have an answer to a single question. So in practice you do not check. You scroll on, and the claim quietly becomes something you believe. Shibui turns that twenty-minute lookup into one question.
Verify a claim about margins
Say someone claims NVIDIA has the best profit margins of the big chip stocks. Ask Claude to rank them, and you have the answer before you would have finished opening the first tab. The figures below come from the database as of June 2026, sourced from Tiingo and SEC EDGAR.
"Which big US semiconductor stocks have the highest net profit margins? Rank the large caps by trailing-twelve-month net margin."
Big US chip stocks, ranked by net profit margin (trailing 12 months):
Ticker Company Net margin
────── ─────────────────── ──────────
NVDA NVIDIA 63.0%
MU Micron Technology 41.5%
AVGO Broadcom 38.8%
KLAC KLA Corp 35.7%
LRCX Lam Research 30.9%
AMAT Applied Materials 29.3%
TXN Texas Instruments 29.1%
NVIDIA leads, and the gap is wide: 63% versus 41.5% for the runner-up.The claim holds. NVIDIA does lead on net margin, and not by a little: 63% against Micron's 41.5% in second place. The order behind it is the part you could not have guessed from headlines, with the memory maker and the chip designers sitting ahead of the equipment names.
How it works
Three steps, and only the first one is setup.
- Paste the connector URL into Claude once. It takes about two minutes and needs no API key.
- Ask your question in plain English, the way you would say it out loud.
- Claude writes the query, runs it against the database, and hands back a table of real numbers.
Verify a claim about valuation
Valuation claims work the same way. Someone says Costco is far more expensive than the other big retailers. Ask for the multiples side by side.
"Is Costco really more expensive than Walmart, Target, and Dollar General? Show their P/E ratios."
Big US retailers, by trailing P/E ratio:
Ticker Company P/E
────── ──────────────── ─────
COST Costco 49.3
WMT Walmart 42.4
TGT Target 17.8
DG Dollar General 16.2
Costco carries the richest multiple; Target and Dollar General trade
at roughly a third of it.Confirmed, with the spread attached. Costco trades near 49 times earnings and Walmart near 42, while Target and Dollar General sit around 18 and 16. Costco's multiple is close to three times Target's, for businesses that look similar from the outside. That is the gap a one-line claim flattens.
Verify a claim about a dividend
Income claims work the same way. Someone calls Coca-Cola's dividend rock-solid. Ask whether earnings and cash flow actually cover it.
"Is Coca-Cola's dividend covered? Show the yield, the payout ratio, and how much of free cash flow goes to the dividend."
Coca-Cola (KO) dividend safety, trailing 12 months:
Metric Value
──────────────────────────── ──────
Dividend yield 3.1%
Payout ratio (% of earnings) 80%
Dividends as % of free cash 87%
Covered: the dividend fits inside both earnings and free cash flow,
though the cushion is thin at 87% of free cash flow.Covered, with a caveat. Coca-Cola pays out about 80% of earnings and 87% of free cash flow to fund a 3.1% yield. The dividend is safe today, but there is little room left before it would absorb the entire cash flow. That caveat is the part a flat "rock-solid" claim hides.
More claims you can check
This is what stock claim verification looks like in practice: ask, read the real numbers, move on. A couple more you can paste in as they are:
"Has Eli Lilly grown revenue every quarter for the last two years, or is the streak a story?"
"Is Nike actually oversold right now, with an RSI under 30, or does it just feel beaten down?"
What this is, and what it isn't:
- Real numbers, checked live. Every table above comes from the database, not a guess. You can ask Claude for the exact query it ran.
- End-of-day data. Prices and valuations refresh daily and lag about a day, so this is for research, not real-time trading.
- US common stock on NYSE and NASDAQ. No options, crypto, or international listings. SEC data is filing metadata, not full text.
- A data tool, not advice. It tells you what the numbers say. What you do with them is your call.
Questions
How do I verify a stock claim without manual lookups?
Connect Shibui to Claude, then ask the claim as a plain-English question, for example "does NVIDIA have the best net margins among big chip stocks?". Claude writes a query against the database and returns a ranked table of real numbers in seconds, instead of you pulling each company by hand.
Where does the data come from, and is it real?
It is real NYSE and NASDAQ data: 31 million daily price records back to 1962, quarterly and annual financial statements, daily valuations, and SEC filing metadata, sourced from Tiingo and SEC EDGAR. Claude queries the database directly and returns actual numbers instead of generating them from memory.
Can't Claude just hallucinate the numbers?
On its own, Claude can hallucinate stock figures, because it generates them from training data. Shibui removes that risk: it makes Claude write a query against a live database, so every number traces back to a real row instead of being made up. Ask, and Claude will show you the exact query it ran.
Do I need to code or pay for a subscription?
No. You ask in plain English, with no SQL and no spreadsheets. Shibui is free, needs no API key, and works on any Claude plan, including the free tier.
How current is the data?
Prices and valuations are end-of-day and refresh daily, so they lag about a day. It is built for research, screening, and fact-checking, not for real-time or intraday trading.
What kinds of claims can it check?
Claims about margins, valuation multiples, dividend coverage, revenue and earnings growth, technical signals such as RSI, and peer comparisons across roughly 9,900 US-listed companies. If a claim is about the fundamentals, prices, or filings of a US stock, Claude can usually check it.
What can't it do?
There are no intraday or real-time prices, no options or crypto, and no international listings beyond US exchanges. SEC coverage is filing metadata, not full text. Shibui is a data tool, not financial advice.
Fact-checking claims is one way people use Shibui. Browse 20 real-world examples, see how investors build screening frameworks, or read the full feature guide.
Shibui Finance is free, and built by Christian Richter in Berlin.
Contact
Checking claims as part of your work and want to compare notes? chris@shibui.finance
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