What is the best insider buying tracker?
By Daniel, The Philosopher Investor · updated October 2, 2026 · every tool named is one we have used or read closely; no prices quoted because they move
OpenInsider is the best free screener for SEC Form 4 filings, with ready-made views of cluster buys. Insider Screener adds alerts and markets outside the US. Finviz shows insider trades next to its stock screener. Quiver Quantitative puts insiders beside other alternative data. The Philosopher Investor reads the insider buying on each stock page, next to the options flow and the chart.
Which tools are in the running?
1. OpenInsider
Good at: Free Form 4 screener with cluster buys, top officer purchases and filters by role, size and date.
Fits when: You want the raw filings, free, and you will do the reading yourself.
2. Insider Screener
Good at: Custom screens and daily alerts on insider transactions, across several markets.
Fits when: You want an alert when a director buys, including outside the US.
3. Finviz
Good at: Recent insider trades on the stock page and a market-wide insider list, inside a free screener.
Fits when: You already screen on Finviz and want the insiders one click away.
4. Quiver Quantitative
Good at: Insider trades next to Congress trading, lobbying and government contracts, with backtests and an API.
Fits when: You run your own research across many alternative data sets.
5. The Philosopher Investor
Good at: The insider buying on every public stock page, next to that name's options flow, dealer gamma and Congress filings.
Fits when: You trade the name and want the insider read in context, in the same place as its other data.
Where does The Philosopher Investor fit?
- Insiders sell for many reasons and buy for one, so the desk reads the buying: open-market purchases, by whom, how large, and whether several insiders buy at once.
- Every public stock page carries the insider record on that name.
- The paid desk adds the cluster boards across the market, crossed with the flow and the chart, in one plan with the dealer map and the Congress records.
Common questions
- How fast are insider trades public?
- Officers, directors and holders above 10 % must file a Form 4 within two business days of the trade. That makes insider buying one of the freshest public signals, far faster than Congress filings or 13F holdings.
- Is insider selling a bad sign?
- Rarely on its own. Insiders sell for taxes, houses, diversification and scheduled plans. Open-market buying with their own money says more, and several insiders buying in the same weeks says more still.
- What is an insider buying cluster?
- Several insiders of the same company buying on the open market within a short window. It is the pattern most studies find worth watching, more than a single purchase.
- Which insider trackers are free?
- OpenInsider and Finviz are free. Insider Screener and Quiver have free tiers. This desk shows the insider record free on every public stock page.