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Never miss a 13D or 13G: tracking big new stakes with SEC Stock Signals

Big new stakes in public companies are disclosed in SEC filings, and they are easy to miss. SEC Stock Signals alerts you when a filing hits a company on your watchlist and explains what changed.

AgentStructure.AI5 min read

Works with

  • Muse.ai
  • Instinct
  • Grok
  • Claude
  • ChatGPT
  • Any MCP-capable assistant
Big new stakes show up in SEC filings first, and SEC Stock Signals can tell you when one lands on a company you follow.
Example alert. Names and numbers are illustrative.

Key takeaways

The short version.

  • Filings that disclose large stakes are easy to miss because nobody tells you when they appear.
  • SEC Stock Signals alerts you when a breaking SEC filing hits a company on your watchlist.
  • Each alert explains what changed and what it could mean for your holding, with a link to the original.
  • You can get alerts by text, email, or in your favorite AI, such as a personal AI like Instinct or Muse.
  • The app reports; it never gives investment advice and never trades for you.

Who it is for

Why do big new stakes slip past so many investors?

  • Here is the problem.

  • Checking the SEC's site by hand every day does not scale.

  • SEC Stock Signals is for people who hold or follow a handful of public companies and want to hear about filings as they happen.

Here is the problem. When an investor builds a large position in a public company, the news often arrives in an SEC filing, commonly a Schedule 13D or 13G. Those filings land at any hour, in dense legal formatting, among thousands of other documents. If you hold a stock or follow it closely, you usually find out late: a headline the next day, a forum post, or a friend's message.

Checking the SEC's site by hand every day does not scale. Ten companies means ten pages to check, and you still have to read each filing to work out what is new and what it might mean. Most people end up checking only when something has already moved.

SEC Stock Signals is for people who hold or follow a handful of public companies and want to hear about filings as they happen. You pick a watchlist. When a breaking SEC filing hits one of those companies, you get an alert with AI analysis of what changed and what it could mean for your portfolio. It reports. It does not tell you what to buy or sell, and it never acts on its own.

Use cases

4 ways people use Never miss a 13D or 13G: tracking big new stakes.

  1. Filing on your holding

    1. A new filing lands on a company you own

    Say you hold shares in a mid-sized company and a new filing appears overnight. Without an alert, you might not see it for days. With SEC Stock Signals, the company is on your watchlist, so the alert reaches you when the filing hits.

    The alert says what the filing is and summarizes what changed, with a link to the original document. What you do next is up to you: read the source, compare it with your own notes, or decide there is nothing to act on.

  2. Watchlist, not homework

    2. You follow several companies and cannot read everything

    Suppose you follow eight companies for a small personal portfolio. Reading every filing is unrealistic. The app's watchlist lookups let you ask your AI what is new across all of them at once.

    For example, you can ask whether anything new has appeared on your watchlist today. You get a short answer: how many new filings there are, a summary of each, and why it may matter. Then you open only the ones worth your time.

  3. Check the track record

    3. You want to know if a past event usually mattered

    A filing is more useful with context. The free plan includes event-study verdicts, integrity checks, and event families, which help you see how a type of event has tended to play out and whether a signal looks sound.

    Say an alert arrives about a type of filing you have not seen before. You can ask your AI to explain the event family and what the verdict says. That gives you a better starting point for your own research. It is information, not a prediction and not advice.

  4. Text, email, or AI

    4. You want it in the place you already look

    Some people want a text, some want email, and some want to talk to a personal AI such as Instinct or Muse. SEC Stock Signals supports all three, so the alert reaches you where you will notice it.

    Pick the channel that matches your day. A text works if you are away from your desk. Email suits a record you can search later. Your AI works best when you want to ask follow-up questions.

On your phone

What the alerts look like.

Filing on your holding

Figure 1

An alert for a company on your watchlist, as it lands on your phone.
Daily watchlist check

Figure 2

Asking your AI about the whole watchlist.
Past event context

Figure 3

Asking what an event type has meant before.

Example alerts. Every name, number and event shown is illustrative.

How to

How do I set up SEC Stock Signals?

  1. Step 1

    Open secstocksignals.com and sign in.

  2. Step 2

    Pick what to watch: the companies on your watchlist.

  3. Step 3

    Open the app's connect page and copy the API key and MCP address.

  4. Step 4

    Connect your AI assistant with them, or choose text or email alerts instead.

  5. Step 5

    Ask your AI what is new on your watchlist to confirm it works.

The apps are free during the beta, and premium lookups are included. SEC Stock Signals reports filings and analysis; it never gives investment advice and never trades for you.

Open Never miss a 13D or 13G: tracking big new stakesConnect your AI

FAQ

Frequently asked questions.

Does SEC Stock Signals tell me what to buy or sell?

No. It reports what changed and what it could mean, and links to the original filing. Decisions stay with you.

How do I receive alerts?

By text, by email, or in your favorite AI. A personal AI such as Instinct or Muse is a natural fit.

What does the free plan include?

Event-study verdicts, integrity checks, and event families. Premium adds ticker and watchlist lookups and new premium tools as they open, and premium is free during the beta.

Can I check the original filing myself?

Yes. Alerts include a link to the original, so you can read the source.

Where do I start?

Go to secstocksignals.com, sign in, pick what to watch, then use the connect page for your API key and MCP address.

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