Introducing the Signals Feed: Algorithmic SEC Filing Alerts

The SEC receives many filings each day. Some report events that investors may want to review, such as a leadership change, a disclosed cybersecurity incident, or several insiders buying shares in the same week.

Finding those needles takes hours. I know because I've spent years doing it manually.

Today I'm launching the Signals Feed, a feed of algorithmically-detected patterns from SEC filings. No more skimming 8-Ks hoping to spot something important. No more building spreadsheets to track insider clusters. The feed does the pattern matching for you.

What Signals Detect

The feed currently tracks five signal types across two categories.

8-K Material Events

Companies generally must file 8-Ks within four business days of certain events, subject to the instructions for each item. The feed flags three item types for review:

Cybersecurity Incidents (Item 1.05) Companies must disclose material cybersecurity incidents under Item 1.05. Coupang filed an amended Item 1.05 report on December 29, 2025. Read the report and any amendment to understand what the company disclosed.

Bankruptcy (Item 1.03) Item 1.03 covers bankruptcy or receivership. Dynatronics reported that it filed for Chapter 7 relief on January 9, 2026; its 8-K was filed on January 12. Check the event date as well as the filing date.

Financial Restatements (Item 4.02) Item 4.02 reports that previously issued financial statements or an audit report should no longer be relied upon. Southwest Gas Holdings filed an Item 4.02 report on January 9, 2026 concerning interim tax accounting errors. Read the company's explanation to assess the scope.

Insider Transaction Clusters

Form 4 filings show when executives and directors buy or sell company stock. A single purchase tells you little. But when multiple insiders buy within the same week, that's unusual.

Cluster Buying We group reported purchases within a 7-day window when the detector's count and value thresholds are met. These thresholds limit which groups appear in the feed. They do not establish why anyone bought or whether the purchases were coordinated. Open the underlying Form 4 filings to check the transaction dates, prices, ownership, and footnotes.

Cluster Selling Same logic, but for sales. Multiple insiders selling in the same week suggests they know something, though selling is harder to interpret. Insiders sell for taxes, to spread out their holdings, and dozens of other reasons. Still worth flagging.

Why I Built This

I've watched the wrong things for years.

I used to set up RSS feeds for every company in my portfolio and scan headlines for material events. The problem is signal-to-noise ratio. For every meaningful 8-K, there are dozens of routine filings: earnings date confirmations, exhibit amendments, director committee assignments.

The real signals are buried. A cybersecurity disclosure lands at 4:47pm on a Friday. An insider cluster buy shows up across four separate Form 4s filed over a week. You'd have to be watching constantly and cross-referencing filings to catch it.

That's not realistic. So I built detection for the patterns that actually matter.

What the Feed Looks Like

Each signal includes:

• Company and ticker with a link to their full filing history
• Signal type badge so you can visually scan for what you care about
• Date the event occurred (or window end date for clusters)
• AI summary explaining what happened, for supported signal types
• Key stats like insider count and total dollar value for clusters

You can filter by signal type. If you only care about cluster buys, show only those. If you want to monitor all material 8-K events, filter to those three.

→ View the live signals feed

The Filtering Problem

Filtering matters more than speed.

The feed aims to show selected filing items and transaction patterns soon after they appear in EDGAR. Filtering helps you decide which filings to open.

The cluster buy filter is an example. It groups qualifying purchases by multiple insiders over a defined window. Instead of treating each Form 4 as an independent alert, you can review the related transactions together.

The 8-K filter focuses on Items 1.03, 1.05, and 4.02. Read the filing before drawing a conclusion: an item match says what the company reported, but does not measure the event's effect on its stock.

What's Next

The five signal types I launched with are the ones I've found most useful for my own research. But there's more to detect:

• Activist positions: 13D filings where an investor crosses 5% and discloses activist intent
• Large insider sales by individual: When a CEO sells $50M of stock, that's different from routine selling to spread out holdings
• Earnings guidance changes: 8-K Item 7.01 voluntary disclosures that update guidance
• Auditor changes: Item 4.01 filings where a company fires their auditor

If you have signal ideas, I want to hear them. What patterns do you watch for manually that could be automated?

Try It Now

The Signals Feed is live and free to use.

→ Browse the signals feed

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Signals are algorithmic pattern detection, not investment advice. The SEC filing is always the authoritative source. Use signals to know when to pay attention, then read the actual document.