Shibui Finance is a free insider buying screener that runs inside Claude. Most insider trackers show you a feed of recent filings for one company at a time. Shibui screens the entire US market at once: 6.4 million parsed Form 3, 4, and 5 filings across nearly 10,000 companies, with the ability to filter by transaction type, insider role, dollar amount, and combine insider activity with any other financial criteria.
What the screener covers
6.4 million insider transactions
Every Form 3, 4, and 5 filing parsed into individual transactions with shares traded, price per share, and transaction codes. Not just filing summaries.
Filter by insider role
Separate CEO and CFO purchases from director buys and 10%+ holder accumulation. Officer purchases carry a different signal than board member purchases.
Combine with any criteria
Cross-reference insider buying with P/E, RSI, revenue growth, or market cap in one request. Traditional insider trackers cannot do this.
Track dollar amounts
A $50,000 purchase means something different from a $5 million one. Filter by total dollar value to find the insider buys that represent real conviction.
What makes insider buying a useful signal
Company insiders (officers, directors, and 10%+ shareholders) are required to report their trades to the SEC within two business days on Form 4. These are legal, public transactions.
Insider buying is considered one of the more reliable bullish signals because insiders spend their own money. They already hold company stock through compensation; when they go into the open market and buy more, they are making a voluntary bet with personal capital. Insider selling is less informative because insiders sell for many reasons (taxes, diversification, planned 10b5-1 programs).
The strongest signals come from clusters of insider buying: multiple insiders at the same company purchasing within a short window. A single director buying $20,000 in shares could mean anything; three officers each buying six-figure amounts in the same month is harder to ignore.
Cluster insider buying right now
As of July 2026, these companies had 3 or more distinct insiders making open-market purchases within 30 days of each other. All transactions are discretionary (10b5-1 plans, gifts, and tax withholding excluded).
"Show me companies where 3 or more different insiders made discretionary open-market purchases within 30 days of each other. Exclude 10b5-1 plans. Show the company, number of unique buyers, total value, and market cap."
10 companies with cluster insider buying (3+ buyers within 30 days), last 60 days:
Company Sector Buyers Total Value Mkt Cap
───────────────────────── ────────────────────── ────── ──────────── ─────────
Quantinuum (QNT) Information Technology 11 $271.3M $17.6B
Vital Farms (VITL) Consumer Staples 11 $3.1M $0.6B
Hudson Technologies (HDSN) Industrials 9 $19.4M $0.3B
Shake Shack (SHAK) Consumer Discretionary 6 $29.1M $2.3B
Fiserv (FISV) Financials 6 $7.7M $27.1B
Granite Ridge (GRNT) Energy 6 $5.0M $0.6B
DENTSPLY SIRONA (XRAY) Health Care 6 $2.6M $2.4B
Norwegian Cruise (NCLH) Consumer Discretionary 5 $50.0M $8.4B
Ryan Specialty (RYAN) Financials 5 $18.4M $10.9B
CarMax (KMX) Consumer Discretionary 5 $6.1M $7.1BLargest insider purchases this quarter
The biggest individual open-market insider buys in the last 90 days by dollar value. Only discretionary purchases (no pre-arranged 10b5-1 plans, no ESPP/401k auto-buys).
"What are the largest insider purchases in the last 90 days by dollar value? Exclude 10b5-1 plans and automatic programs. Show the company, insider name, their role, date, and dollar value."
8 largest discretionary insider purchases, last 90 days:
Company Insider Role Date Value
───────────────────── ───────────────────────── ────────── ────────── ──────────
Rivian (RIVN) Volkswagen AG 10%+ Owner 2026-04-30 $1,000.0M
Parabilis Med (PBLS) RA Capital Healthcare Fund 10%+ Owner 2026-06-11 $394.6M
Jefferies (JEF) Sumitomo Mitsui Financial 10%+ Owner 2026-05-01 $352.5M
Liberty LatAm (LILAK) John C. Malone 10%+ Owner 2026-05-22 $106.5M
Summit Thera (SMMT) Robert W. Duggan Co-CEO 2026-06-12 $50.0M
Summit Thera (SMMT) Maky Zanganeh Co-CEO 2026-06-12 $50.0M
Republic Svcs (RSG) Cascade Investment 10%+ Owner 2026-05-13 $35.1M
Republic Svcs (RSG) Cascade Investment 10%+ Owner 2026-05-14 $31.4MWhat OpenInsider and Finviz can't do
OpenInsider and Finviz are good at browsing recent filings one company at a time. What they cannot do is combine insider data with other financial criteria in a single query:
- "Show me insider buys where the stock also has P/E under 15 and RSI below 30"
- "Find companies where 3+ insiders bought within 30 days and revenue grew 20%+ YoY"
- "Which stocks had insider cluster buying within 90 days of a positive earnings surprise?"
These queries cross-reference insider transactions with fundamentals, technicals, and earnings data. Traditional insider trackers show the filing data; Shibui lets you filter on any combination of the company's financial profile at the same time.
Example screens
"Show me companies where 3 or more different insiders made open-market purchases in the last 30 days. Include each insider's name, title, shares bought, and total dollar value."
This finds cluster buying. Multiple insiders buying around the same time is a stronger signal than any single purchase.
"Find stocks where an insider purchased more than $500,000 worth of shares in the last 60 days, the current P/E is under 15, and the market cap is above $1 billion."
This combines insider conviction with value criteria. Traditional insider trackers show the filing; Shibui lets you filter by the company's valuation at the same time.
"Show me all open-market purchases by CEOs or CFOs in the last 90 days where the purchase was at least $100,000. Exclude 10b5-1 plan transactions."
C-suite purchases are the highest-signal insider buys. Excluding 10b5-1 pre-arranged plans filters out automated selling and buying programs, leaving only discretionary trades.
"Find stocks where insiders bought shares in the last 30 days and the current RSI(14) is below 35. Show the stock, the insider name, purchase amount, and current RSI."
Insiders buying while the stock is technically oversold. This cross-references Form 4 data with daily technical indicators, which no standalone insider tracker can do.
What data is in each filing
| Field | What it tells you |
|---|---|
| Transaction date | When the trade actually happened (not the filing date) |
| Transaction code | Purchase (P), sale (S), award (A), exercise (M), gift (G), and others |
| Shares traded | Number of shares in the transaction |
| Price per share | The price at which the insider traded |
| Insider name and title | Who made the trade and their role (CEO, CFO, Director, 10% Owner) |
| Is officer / is director / is 10% owner | The insider's relationship to the company |
| 10b5-1 flag | Whether the trade was part of a pre-arranged trading plan |
| Shares owned after | The insider's total holdings after the transaction |
How it compares to other insider trackers
| Feature | Shibui | OpenInsider | Finviz |
|---|---|---|---|
| Price | Free | Free | Free (basic) / $39/mo (Elite) |
| Insider data | 6.4M transactions, Forms 3/4/5 | Form 4 only | Basic insider tab |
| Market-wide screening | Yes, any criteria in plain English | Pre-set filters | Pre-set filters |
| Combine with fundamentals | Yes (P/E, revenue, margins, etc.) | No | Separate screener |
| Combine with technicals | Yes (RSI, MACD, Bollinger Bands) | No | Separate screener |
| Custom compound screens | Yes (any combination) | No | No |
| 10b5-1 plan filter | Yes | Yes | No |
| Historical depth | Full SEC filing history | ~10 years | Recent only |
OpenInsider and Finviz are good for browsing recent filings. Shibui is built for screening: find stocks where insider buying lines up with specific valuation, technical, or fundamental criteria. The insider trading tracker guide walks through the data in more detail.
Frequently asked questions
How do I find stocks with insider buying?
Connect Shibui Finance to Claude and describe what you want in plain English. You can filter by the number of insiders buying, the dollar amount, the time window, and the insider's role. Claude queries 6.4 million parsed filings and returns the results.
Is there a free insider buying screener?
Yes. Shibui Finance is free. You need a Claude account (free or paid) and a one-time connection setup. There is no API key, no subscription, and no data limit for screening.
What is insider buying and why does it matter?
Insider buying is when a company officer, director, or major shareholder purchases shares on the open market with personal funds. It is reported to the SEC on Form 4 within two business days. It is considered a bullish signal because insiders know their company's operations and are voluntarily betting their own money.
What is the difference between insider buying and insider trading?
Insider buying refers to legal, publicly reported purchases by company insiders. Insider trading, in the illegal sense, means trading on material non-public information. All data in Shibui covers legal, SEC-reported transactions.
Can I combine insider buying with other screening criteria?
Yes. Shibui has insider filings, fundamentals, technicals, and valuations in one database. You can screen for insider buying alongside P/E ratios, RSI levels, revenue growth, or any other metric in a single request.
Related SEC filing pages:
- SEC Filings Hub — overview of all filing types and data coverage
- Insider Trading Tracker — Form 4 deep-dive: transaction codes, timing, cluster detection
- 13D and 13G Filings — activist investors and major holders above 5%
- Track Filing Activity — triage the daily 8-K feed by market cap
Connect Shibui to Claude in 2 minutes
Shibui is free. Connect it to Claude (free or paid plan) and screen 10,000 US stocks for insider buying alongside any criteria you define.
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