# See Berkshire 13F holdings and changes

**Use case:** 

Gets the top 20 positions of Berkshire Hathaway from its latest 13F-HR filing, with quarter-over-quarter changes (NEW, INCREASED, DECREASED, SOLD_OUT), portfolio weight and value. Useful for tracking what a major fund bought or sold last quarter.

## Input

```json
{
  "tickers": [
    "NVDA",
    "TSLA"
  ],
  "ciks": [
    "1067983"
  ],
  "formType": "13F-HR",
  "days": 30,
  "transactionCodes": [
    "P",
    "S"
  ],
  "minTransactionValueUsd": 0,
  "includeDerivative": true,
  "quarters": 1,
  "compareWithPrevious": true,
  "aggregateByCusip": true,
  "maxHoldingsPerFiling": 20,
  "includeAmendments": true,
  "onlyNew": false,
  "stateStoreName": "sec-insider-13f-state",
  "maxFilingsPerEntity": 200,
  "maxResults": 20
}
```

## Output

```json
{
  "recordType": {
    "label": "Type",
    "format": "string"
  },
  "filingDate": {
    "label": "Filed",
    "format": "string"
  },
  "ticker": {
    "label": "Ticker",
    "format": "string"
  },
  "issuerName": {
    "label": "Company",
    "format": "string"
  },
  "insiderName": {
    "label": "Insider",
    "format": "string"
  },
  "insiderRelationship": {
    "label": "Role",
    "format": "string"
  },
  "transactionDate": {
    "label": "Trade date",
    "format": "string"
  },
  "transactionCode": {
    "label": "Code",
    "format": "string"
  },
  "transactionType": {
    "label": "Transaction",
    "format": "string"
  },
  "shares": {
    "label": "Shares",
    "format": "number"
  },
  "pricePerShare": {
    "label": "Price ($)",
    "format": "number"
  },
  "totalValueUsd": {
    "label": "Value ($)",
    "format": "number"
  },
  "sharesOwnedAfter": {
    "label": "Owned after",
    "format": "number"
  },
  "fundName": {
    "label": "Fund",
    "format": "string"
  },
  "reportPeriod": {
    "label": "Quarter",
    "format": "string"
  },
  "nameOfIssuer": {
    "label": "Holding",
    "format": "string"
  },
  "cusip": {
    "label": "CUSIP",
    "format": "string"
  },
  "valueUsd": {
    "label": "Position ($)",
    "format": "number"
  },
  "portfolioWeightPct": {
    "label": "Weight %",
    "format": "number"
  },
  "positionChange": {
    "label": "QoQ",
    "format": "string"
  },
  "sharesChangePct": {
    "label": "Change %",
    "format": "number"
  },
  "filingUrl": {
    "label": "Filing",
    "format": "string"
  }
}
```

## How it works

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

The SEC Insider Trading API: Form 4, 13F Holdings, Funds Actor is ready to run with the inputs already set for "See Berkshire 13F holdings and changes". [Sign up or log in](https://console.apify.com/create-task-from-example/yCGQa0szjmEv4hAEP) and you'll land in Apify Console with a copy of this exact task.

### 2. Start the "See Berkshire 13F holdings and changes" task

The SEC Insider Trading API: Form 4, 13F Holdings, Funds Actor will start running based on the input automatically. You can also change all the input fields, like tickers, CIK numbers (funds or insiders), and more, to match your specific use case.

### 3. Receive the "See Berkshire 13F holdings and changes" 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 type, filed, ticker, 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 "See Berkshire 13F holdings and changes" task via API](https://apify.com/actose/sec-edgar-insider-trades-13f.md).

## About this Actor

This example demonstrates how to use [SEC Insider Trading API: Form 4, 13F Holdings, Funds](https://apify.com/actose/sec-edgar-insider-trades-13f.md) with a specific input configuration. Visit the [Actor detail page](https://apify.com/actose/sec-edgar-insider-trades-13f.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/actose/sec-edgar-insider-trades-13f.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`).