every filing, read within the hour
Insiders tell the SEC.
We tell you which ones to believe.
When several executives buy their own company's stock at the same time, most people call it a signal. We tested 2,465 of them. The buying itself predicts almost nothing. The buyers' own track record does. So that is what we score.
Latest filings read—
insider purchases read
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historical signals tested
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insiders with a record on file
1h
from filing to your screen
The finding
The cluster means little.
The buyer's record means a lot.
We took every case since 2023 where two or more insiders bought the same stock within a few weeks and measured the stock 90 days later against the S&P 500. The famous signal is noise. What the specific buyers had done before is not. Our first score ignored that, so we threw it away and rebuilt it.
The full backtest, caveats included →Average result 90 days later, vs the market
Every cluster buy
2,452 cases, 2023 to 2026
-0.6%
41% beat the market 90 days later
Buyers with a strong record
the same people had beaten the market before, 131 cases
+10.8%
49% beat the market 90 days later
Everyone else
919 cases
0.0%
42% beat the market 90 days later
What you get
A signal reads like a sentence.
Which company, who bought, how much, what those people's earlier buys did, and a score you can argue with. Below are real ones, shown on the free 3-day delay.
The leaderboard
The people worth following.
Thousands of insiders with a record, each with their own page: every group buy they were part of and what the stock did in the 90 days after. When one of them buys again, you hear about it.
See the whole leaderboard →Nobody else does this
A live account you can audit. Losers included.
A simulated $1,000 account buys every signal scoring 60 or more at the close on the day it appears, holds it 90 days, and sells. Nothing is added later, nothing is removed, and every entry price is the one that was on the screen that day. The rules were fixed on 5 September 2026 and replayed over August at each signal's filing date; everything since is live, and each position says which it is. Watch it work or watch it fail.
See every position →The account
since —
Balance
$—
Return
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S&P 500
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Simulated. Entry at the close on the day a signal appears, 10% of the account per position, 90-day hold. Backfilled from 4 Aug 2026 under today's rules, live since 6 Sep 2026. Past results, simulated or real, do not guarantee future ones.
How it works
Three steps, no magic.
01
Every filing, within the hour
Executives and directors must report a purchase of their own stock to the SEC within two business days. We read every one of those filings as it lands.
02
The ones where they buy together
One insider buying can mean anything. Several buying the same company in the same few weeks is the pattern worth a second look. Those become signals.
03
Scored by who is buying
The score comes from what actually predicted results across 2,465 past cases. Most of the weight sits on whether these particular people have been right before.
A mandatory SEC disclosure that corporate insiders (executives, directors, 10%+ owners) must file within 2 business days of buying or selling their company's stock. It's public data. Most traders just never look at it systematically.
Because that's what the data said. Across 2,452 group buys with a full 90-day outcome, the average result was slightly below the market. When the specific buyers had beaten the market on their earlier buys, the next one averaged +10.8% above it. The size of the purchase and the titles involved added almost nothing.
No. Form4Signals is a research tool. We surface and score public data; we never tell you what to buy, we don't execute trades, and we don't hold your money.
Free accounts see every signal on a 3-day delay with the full methodology. Pro ($14/mo, first 14 days free) gets signals the day they're filed, the buyers' records on every card, alerts, exit alerts and the Monday briefing. Cancel anytime.
The next filing lands within the hour.
Free accounts get every signal on a 3-day delay. Pro gets it the day it's filed, 14 days free, then $14 a month, cancel anytime.