Returns JSON object with fields including:
- Company: symbol, longName, sector, industry, longBusinessSummary, website, city, country
- Price: currentPrice, previousClose, open, dayHigh, dayLow, fiftyTwoWeekHigh, fiftyTwoWeekLow
- Valuation: marketCap, enterpriseValue, trailingPE, forwardPE, priceToBook, pegRatio
- Trading: volume, averageVolume, averageVolume10days, bid, ask, bidSize, askSize
- Dividends: dividendRate, dividendYield, exDividendDate, payoutRatio
- Financials: totalRevenue, revenueGrowth, earningsGrowth, profitMargins, operatingMargins
- Performance: beta, fiftyDayAverage, twoHundredDayAverage, trailingEps, forwardEps

Note: Available fields vary by security type. Timestamps are converted to readable dates.

Returns a JSON object with the fields supplied by Yahoo Finance:
- current: Current market price
- low: Lowest analyst price target
- high: Highest analyst price target
- mean: Mean analyst price target
- median: Median analyst price target

Analyst coverage and available fields vary by symbol.

Returns analyst actions newest first. Fields supplied by Yahoo Finance can include:
- GradeDate: Date and time of the analyst action
- Firm: Analyst firm name
- ToGrade and FromGrade: New and previous ratings
- Action: Rating action, such as upgrade, downgrade, initiation, or reiteration
- priceTargetAction: Price target action, such as Raises, Lowers, or Maintains
- currentPriceTarget and priorPriceTarget: New and previous price targets

Available fields vary by symbol and analyst action.

Returns JSON array where each news item has:
- id: Unique article identifier
- content: Object containing:
    - title: Article headline
    - summary: Brief article summary
    - pubDate: Publication date (ISO 8601 format)
    - provider: Object with displayName (e.g., "Yahoo Finance") and url
    - canonicalUrl: Object with article url, site, region, lang
    - thumbnail: Object with image URLs and resolutions
    - contentType: Type of content (e.g., "STORY", "VIDEO")

Use this to track company announcements, market sentiment, and breaking news.

Returns JSON with search results based on search_type:

- 'quotes': Array of securities with:
    - symbol: Ticker symbol
    - shortname/longname: Company name
    - quoteType: Security type (EQUITY, ETF, MUTUALFUND, etc.)
    - exchange: Exchange code
    - sector: Business sector
    - industry: Industry classification
    - score: Search relevance score

- 'news': Array of articles with:
    - uuid: Article identifier
    - title: Headline
    - publisher: News source
    - link: Article URL
    - providerPublishTime: Unix timestamp
    - relatedTickers: Array of related symbols
    - thumbnail: Image URLs

- 'all': Object with both 'quotes' and 'news' arrays

Use this to find ticker symbols, discover related securities, or search financial news.

This unified tool provides access to various rankings:
- ETFs and mutual funds focused on the sector
- Largest companies by market capitalization
- Fastest-growing companies by revenue/earnings
- Best-performing stocks by price appreciation

Returns JSON data with relevant metrics for each entity type.

When chart_type is None, returns Markdown table with columns:
- Date: Trading date (index)
- Open: Opening price
- High: Highest price
- Low: Lowest price
- Close: Closing price
- Volume: Trading volume
- Dividends: Dividend payments (if any)
- Stock Splits: Split events (if any)

When chart_type is specified, returns a chart image:
- 'price_volume': Candlestick chart with volume bars
- 'vwap': Price with Volume Weighted Average Price overlay
- 'volume_profile': Volume distribution by price level

Set prepost=True to include pre-market and post-market data when available.

Note: Not all period/interval combinations are valid. Minute intervals (1m, 5m, etc.)
only work with short periods (1d, 5d).

Returns JSON with calls and/or puts data for each expiration date.

JSON fields include:
- contractSymbol: Option contract identifier
- strike: Strike price
- lastPrice: Last traded price
- bid/ask: Bid and ask prices
- volume: Trading volume
- openInterest: Open interest
- impliedVolatility: Implied volatility (IV)
- inTheMoney: Whether option is ITM
- contractSize: Contract size (REGULAR)
- currency: Currency (USD)

Use this to analyze options pricing, IV surfaces, and strike levels.

Returns JSON array of expiration dates in YYYY-MM-DD format.

Use these dates with the 'yfinance_get_option_chain' tool to fetch
the options chain for a specific date.

Returns JSON with:
- major_holders: Aggregated breakdown including insider % held, institutional % held,
  institutional % float held, and institution count.
- institutional_holders: List of institutional investors with shares held, date reported,
  value, and % change.
- mutualfund_holders: List of mutual fund holders with same fields.
- insider_transactions: Recent insider transactions including shares, value, transaction
  type, and date.
- insider_purchases: Summary of insider buy/sell activity over the last 6 months.
- insider_roster: List of known insiders by name and position.

Use this to analyze ownership concentration, insider activity, and institutional interest.