# Inspect W. R. Berkley Schedule 13D ownership

**Use case:** 

Inspect the March 2026 amendment. Overlapping reporting-person holdings are kept separate and must not be summed.

## Input

```json
{
  "companies": [],
  "filingUrls": [
    "https://www.sec.gov/Archives/edgar/data/11544/000119312526092603/primary_doc.xml"
  ],
  "include13G": false,
  "lookbackDays": 365,
  "maxFilingsPerCompany": 4,
  "maxResults": 5,
  "comparePrevious": false,
  "onlyChanges": false,
  "snapshotName": "default",
  "stateStoreName": "maydit-major-shareholder-history",
  "maxRunSeconds": 240
}
```

## Output

```json
{
  "issuerName": {
    "label": "Issuer",
    "format": "text"
  },
  "reportingPersonName": {
    "label": "Reporting person",
    "format": "text"
  },
  "formType": {
    "label": "SEC form",
    "format": "text"
  },
  "eventDate": {
    "label": "Reported event date",
    "format": "text"
  },
  "aggregateOwned": {
    "label": "Reported shares",
    "format": "number"
  },
  "ownershipPercent": {
    "label": "Reported stake (%)",
    "format": "number"
  },
  "ownershipPercentagePointChange": {
    "label": "Change (percentage pts)",
    "format": "number"
  },
  "purposeStatus": {
    "label": "Item 4 availability",
    "format": "text"
  },
  "comparisonStatus": {
    "label": "Saved comparison",
    "format": "text"
  },
  "sourceUrl": {
    "label": "SEC filing",
    "format": "link"
  },
  "observedAt": {
    "label": "Observed",
    "format": "date"
  }
}
```

## How it works

### 1. Sign up on Apify or log in

The Major Shareholder Change Monitor - SEC 13D & 13G Actor is ready to run with the inputs already set for "Inspect W. R. Berkley Schedule 13D ownership". [Sign up or log in](https://console.apify.com/create-task-from-example/iJmFtloKA5dbHUS52) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "Inspect W. R. Berkley Schedule 13D ownership" task

The Major Shareholder Change Monitor - SEC 13D & 13G Actor will start running based on the input automatically. You can also change all the input fields, like company watchlist: ticker or cik, exact sec ownership xml urls, and more, to match your specific use case.

### 3. Receive the "Inspect W. R. Berkley Schedule 13D ownership" output

Monitor the progress in real time. You will be notified as soon as your dataset is complete and ready for review. Each result includes data such as issuer, reporting person, SEC form, and more.

### 4. Integrate into your workflow

The final output is delivered in JSON, CSV, or Excel format, ready to be plugged into your workflow. You can also [run the "Inspect W. R. Berkley Schedule 13D ownership" task via API](https://apify.com/maydit/major-shareholder-change-monitor.md).

## About this Actor

This example demonstrates how to use [Major Shareholder Change Monitor - SEC 13D & 13G](https://apify.com/maydit/major-shareholder-change-monitor.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/maydit/major-shareholder-change-monitor.md) to learn more, explore other use cases, and run it yourself.


## How to integrate an Actor?

This Task's input is already configured above. Use it as-is rather than inventing a new one.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For full API examples (JavaScript, Python, CLI, MCP, OpenAPI), see this Task's Actor page: https://apify.com/maydit/major-shareholder-change-monitor.md

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).