stock-liquidity（股票流动性）

Stock Liquidity Analysis Skill

Analyzes stock liquidity across multiple dimensions — bid-ask spreads, volume patterns, order book depth, estimated market impact, and turnover ratios — using data from Yahoo Finance via yfinance.

Liquidity matters because it determines the real cost of trading. The quoted price is not what you actually pay — spreads, slippage, and market impact all eat into returns, especially for larger positions or less liquid names.

Important: This is for research and educational purposes only. Not financial advice. yfinance is not affiliated with Yahoo, Inc.

Step 1: Ensure Dependencies Are Available

Current environment status:

!`python3 -c "import yfinance, pandas, numpy; print(f'yfinance={yfinance.__version__} pandas={pandas.__version__} numpy={numpy.__version__}')" 2>/dev/null || echo "DEPS_MISSING"`

If DEPS_MISSING, install required packages:

import subprocess, sys
subprocess.check_call([sys.executable, "-m", "pip", "install", "-q", "yfinance", "pandas", "numpy"])

If already installed, skip and proceed.

Step 2: Route to the Correct Sub-Skill

Classify the user's request and jump to the matching section. If the user asks for a general liquidity assessment without specifying a particular metric, run Sub-Skill A (Liquidity Dashboard) which computes all key metrics together.

Defaults

Sub-Skill A: Liquidity Dashboard

Goal: Produce a comprehensive liquidity snapshot combining all key metrics for one or more tickers.

A1: Fetch data and compute all metrics

import yfinance as yf
import pandas as pd
import numpy as np

def liquidity_dashboard(ticker_symbol, period="3mo"):
    ticker = yf.Ticker(ticker_symbol)
    info = ticker.info
    hist = ticker.history(period=period)

    if hist.empty:
        return None

    # --- Spread metrics (from current quote) ---
    bid = info.get("bid", None)
    ask = info.get("ask", None)
    current_price = info.get("currentPrice") or info.get("regularMarketPrice") or hist["Close"].iloc[-1]

    spread = None
    spread_pct = None
    if bid and ask and bid > 0 and ask > 0:
        spread = round(ask - bid, 4)
        midpoint = (ask + bid) / 2
        spread_pct = round((spread / midpoint) * 100, 4)

    # --- Volume metrics ---
    avg_volume = hist["Volume"].mean()
    median_volume = hist["Volume"].median()
    avg_dollar_volume = (hist["Close"] * hist["Volume"]).mean()
    volume_std = hist["Volume"].std()
    volume_cv = volume_std / avg_volume if avg_volume > 0 else None  # coefficient of variation

    # --- Turnover ratio ---
    shares_outstanding = info.get("sharesOutstanding", None)
    float_shares = info.get("floatShares", None)
    base_shares = float_shares or shares_outstanding
    turnover_ratio = round(avg_volume / base_shares, 6) if base_shares else None

    # --- Amihud illiquidity ratio ---
    # Average of |daily return| / daily dollar volume
    returns = hist["Close"].pct_change().dropna()
    dollar_volume = (hist["Close"] * hist["Volume"]).iloc[1:]  # align with returns
    amihud_values = returns.abs() / dollar_volume
    amihud = amihud_values[amihud_values.replace([np.inf, -np.inf], np.nan).notna()].mean()

    # --- Market impact estimate (square-root model) ---
    # For a hypothetical order of 1% of ADV
    adv = avg_volume
    order_size = adv * 0.01
    daily_volatility = returns.std()
    sigma = daily_volatility
    participation_rate = order_size / adv if adv > 0 else 0
    impact_bps = sigma * np.sqrt(participation_rate) * 10000  # in basis points

    return {
        "ticker": ticker_symbol,
        "current_price": round(current_price, 2),
        "bid": bid,
        "ask": ask,
        "spread": spread,
        "spread_pct": spread_pct,
        "avg_daily_volume": int(avg_volume),
        "median_daily_volume": int(median_volume),
        "avg_dollar_volume": round(avg_dollar_volume, 0),
        "volume_cv": round(volume_cv, 3) if volume_cv else None,
        "shares_outstanding": shares_outstanding,
        "float_shares": float_shares,
        "turnover_ratio": turnover_ratio,
        "amihud_illiquidity": round(amihud * 1e9, 4) if not np.isnan(amihud) else None,
        "daily_volatility": round(daily_volatility * 100, 2),
        "impact_1pct_adv_bps": round(impact_bps, 2),
        "observations": len(hist),
    }

A2: Interpret and present

Present as a summary card. For the Amihud illiquidity ratio, multiply by 1e9 for readability (standard convention).

Liquidity grade (use these rough thresholds for US equities):

When comparing multiple tickers, show a side-by-side table and highlight which is more liquid and why.

Sub-Skill B: Spread Analysis

Goal: Detailed bid-ask spread analysis including current spread, historical context from options data, and effective spread estimates.

B1: Current spread from quote

import yfinance as yf

def spread_analysis(ticker_symbol):
    ticker = yf.Ticker(ticker_symbol)
    info = ticker.info

    bid = info.get("bid", 0)
    ask = info.get("ask", 0)
    bid_size = info.get("bidSize", None)
    ask_size = info.get("askSize", None)
    current_price = info.get("currentPrice") or info.get("regularMarketPrice", 0)

    result = {"bid": bid, "ask": ask, "bid_size": bid_size, "ask_size": ask_size}

    if bid > 0 and ask > 0:
        midpoint = (bid + ask) / 2
        result["absolute_spread"] = round(ask - bid, 4)
        result["relative_spread_pct"] = round((ask - bid) / midpoint * 100, 4)
        result["relative_spread_bps"] = round((ask - bid) / midpoint * 10000, 2)
    return result

B2: Options spread context

Options data from yfinance includes bid/ask for each strike, which gives a sense of derivatives liquidity. Use the nearest expiration, extract near-the-money calls and puts, and compute spread and spread percentage for each.

See references/liquidity_reference.md § "Options Spread Analysis" for the full code template.

B3: Present results

Show:

• Current quoted spread (absolute, relative %, basis points)
• Bid/ask sizes if available
• Near-the-money options spreads for context
• How the spread compares to typical ranges for this market cap tier

Sub-Skill C: Volume Analysis

Goal: Analyze trading volume patterns — averages, trends, relative volume, and dollar volume.

C1: Compute volume metrics

import yfinance as yf
import pandas as pd
import numpy as np

def volume_analysis(ticker_symbol, period="3mo"):
    ticker = yf.Ticker(ticker_symbol)
    hist = ticker.history(period=period)

    if hist.empty:
        return None

    vol = hist["Volume"]
    close = hist["Close"]
    dollar_vol = vol * close

    # Relative volume (today vs average)
    rvol = vol.iloc[-1] / vol.mean() if vol.mean() > 0 else None

    # Volume trend (linear regression slope over the period)
    x = np.arange(len(vol))
    slope, _ = np.polyfit(x, vol.values, 1) if len(vol) > 1 else (0, 0)
    trend_pct = (slope * len(vol)) / vol.mean() * 100  # % change over period

    # Volume profile by day of week
    hist_copy = hist.copy()
    hist_copy["DayOfWeek"] = hist_copy.index.dayofweek
    day_names = {0: "Mon", 1: "Tue", 2: "Wed", 3: "Thu", 4: "Fri"}
    vol_by_day = hist_copy.groupby("DayOfWeek")["Volume"].mean()
    vol_by_day.index = vol_by_day.index.map(day_names)

    # High/low volume days
    high_vol_days = hist.nlargest(5, "Volume")[["Close", "Volume"]]
    low_vol_days = hist.nsmallest(5, "Volume")[["Close", "Volume"]]

    return {
        "avg_volume": int(vol.mean()),
        "median_volume": int(vol.median()),
        "avg_dollar_volume": round(dollar_vol.mean(), 0),
        "current_volume": int(vol.iloc[-1]),
        "relative_volume": round(rvol, 2) if rvol else None,
        "volume_trend_pct": round(trend_pct, 1),
        "volume_by_day": vol_by_day.to_dict(),
        "high_vol_days": high_vol_days,
        "low_vol_days": low_vol_days,
        "max_volume": int(vol.max()),
        "min_volume": int(vol.min()),
    }

C2: Present results

Show:

• Average daily volume (shares and dollar) with median for comparison
• Relative volume (RVOL) — today's volume vs. the average. RVOL > 1.5 is elevated; RVOL < 0.5 is unusually quiet
• Volume trend — is trading activity increasing or declining?
• Day-of-week pattern (if meaningful variation exists)
• Top 5 highest-volume days with context (earnings? news?)

Sub-Skill D: Order Book Depth

Goal: Estimate order book depth using available bid/ask data from the equity quote and options chain.

Yahoo Finance does not provide full Level 2 / order book data. Be upfront about this limitation. What we can do:

1. Equity quote: bid, ask, bid size, ask size (top of book only)
2. Options chain: bid/ask and open interest across strikes give a proxy for derivatives depth
3. Intraday volume distribution: how volume is distributed within the day suggests how deep the continuous market is

D1: Gather available depth data

Collect three data points:

1. Top of book — bid, ask, bidSize, askSize from ticker.info
2. Intraday volume distribution — 5-min bars over the last 5 days, grouped by time-of-day and normalized to percentage of daily volume
3. Options open interest — total call/put OI and volume from the nearest expiration as a derivatives depth proxy

See references/liquidity_reference.md § "Order Book Depth Proxy" for the full code template.

D2: Present results

Show:

• Top of book: current bid/ask with sizes
• Intraday volume shape: where volume concentrates (open/close vs. midday)
• Options depth: total open interest and volume as a proxy for derivatives liquidity
• Honest limitation: "Yahoo Finance provides top-of-book only. For full Level 2 depth, a direct market data feed (e.g., NYSE OpenBook, NASDAQ TotalView) is needed."

Sub-Skill E: Market Impact

Goal: Estimate how much a given order size would move the price, using the square-root market impact model.

The standard model in practice is: Impact (%) = σ × √(Q / V) where σ is daily volatility, Q is order size in shares, and V is average daily volume. This is a simplified version of the Almgren-Chriss framework used by institutional traders.

E1: Compute market impact estimate

import yfinance as yf
import numpy as np

def market_impact(ticker_symbol, order_shares=None, order_dollars=None, period="3mo"):
    ticker = yf.Ticker(ticker_symbol)
    hist = ticker.history(period=period)
    info = ticker.info

    if hist.empty:
        return None

    current_price = info.get("currentPrice") or hist["Close"].iloc[-1]
    avg_volume = hist["Volume"].mean()
    daily_volatility = hist["Close"].pct_change().dropna().std()

    # Determine order size in shares
    if order_dollars and not order_shares:
        order_shares = order_dollars / current_price
    elif not order_shares:
        # Default: estimate for various sizes
        order_shares = avg_volume * 0.01  # 1% of ADV

    participation_rate = order_shares / avg_volume if avg_volume > 0 else 0
    pct_adv = (order_shares / avg_volume * 100) if avg_volume > 0 else 0

    # Square-root impact model
    impact_pct = daily_volatility * np.sqrt(participation_rate) * 100
    impact_bps = impact_pct * 100
    impact_dollars = impact_pct / 100 * current_price * order_shares

    # Generate impact curve for multiple order sizes
    sizes = [0.001, 0.005, 0.01, 0.02, 0.05, 0.10, 0.20, 0.50]  # as fraction of ADV
    curve = []
    for s in sizes:
        q = avg_volume * s
        imp = daily_volatility * np.sqrt(s) * 100
        curve.append({
            "pct_adv": round(s * 100, 1),
            "shares": int(q),
            "dollars": round(q * current_price, 0),
            "impact_bps": round(imp * 100, 1),
            "impact_dollars_per_share": round(imp / 100 * current_price, 4),
        })

    return {
        "ticker": ticker_symbol,
        "current_price": round(current_price, 2),
        "avg_daily_volume": int(avg_volume),
        "daily_volatility_pct": round(daily_volatility * 100, 2),
        "order_shares": int(order_shares),
        "order_dollars": round(order_shares * current_price, 0),
        "pct_of_adv": round(pct_adv, 2),
        "estimated_impact_bps": round(impact_bps, 1),
        "estimated_impact_pct": round(impact_pct, 4),
        "estimated_impact_total_dollars": round(impact_dollars, 2),
        "impact_curve": curve,
    }

E2: Present results

Show:

• The estimated impact for the user's specific order size
• An impact curve table showing how cost scales with order size
• Context: "This uses the square-root market impact model, a standard institutional estimate. Actual impact depends on execution strategy (VWAP, TWAP, etc.), time of day, and current market conditions."
• If impact > 50 bps, flag that the order is large relative to liquidity and suggest the user consider algorithmic execution or splitting the order across days

Sub-Skill F: Turnover Ratio

Goal: Measure how actively a stock trades relative to its shares outstanding and free float.

F1: Compute turnover metrics

import yfinance as yf
import pandas as pd
import numpy as np

def turnover_analysis(ticker_symbol, period="3mo"):
    ticker = yf.Ticker(ticker_symbol)
    hist = ticker.history(period=period)
    info = ticker.info

    if hist.empty:
        return None

    avg_volume = hist["Volume"].mean()
    shares_outstanding = info.get("sharesOutstanding")
    float_shares = info.get("floatShares")

    result = {
        "avg_daily_volume": int(avg_volume),
        "shares_outstanding": shares_outstanding,
        "float_shares": float_shares,
    }

    if shares_outstanding:
        daily_turnover = avg_volume / shares_outstanding
        result["daily_turnover_ratio"] = round(daily_turnover, 6)
        result["annualized_turnover"] = round(daily_turnover * 252, 2)
        result["days_to_trade_float"] = round(
            (float_shares or shares_outstanding) / avg_volume, 1
        ) if avg_volume > 0 else None

    if float_shares:
        float_turnover = avg_volume / float_shares
        result["float_turnover_daily"] = round(float_turnover, 6)
        result["float_turnover_annualized"] = round(float_turnover * 252, 2)

    # Turnover trend
    vol = hist["Volume"]
    base = float_shares or shares_outstanding
    if base:
        hist_copy = hist.copy()
        hist_copy["turnover"] = hist_copy["Volume"] / base
        recent_turnover = hist_copy["turnover"].tail(20).mean()
        older_turnover = hist_copy["turnover"].head(20).mean()
        if older_turnover > 0:
            result["turnover_trend_pct"] = round(
                (recent_turnover - older_turnover) / older_turnover * 100, 1
            )

    return result

F2: Present results

Show:

• Daily and annualized turnover ratios (vs. outstanding and float)
• "Days to trade the float" — how many days at average volume to turn over the entire free float
• Turnover trend — is the stock becoming more or less actively traded?
• Context:

Step 3: Respond to the User

After running the appropriate sub-skill:

Always include

• The lookback period used for historical metrics
• The data timestamp — spreads and quotes are snapshots, not real-time
• Any tickers that returned empty data (invalid symbol, delisted, etc.)

Always caveat

• Yahoo Finance quote data has a 15-minute delay for most exchanges — spreads shown may not reflect the current live market
• Full order book (Level 2) data is not available through Yahoo Finance
• Market impact estimates are models, not guarantees — actual execution costs depend on strategy, timing, and market conditions
• Liquidity can change rapidly — a stock that's liquid today may not be tomorrow (especially around events, halts, or during extended hours)

Practical guidance (mention when relevant)

• Position sizing: If estimated impact exceeds 25 bps, the position may be too large for the stock's liquidity
• Small/micro-cap warning: Stocks with < $1M daily dollar volume require careful execution
• Spread costs compound: A 0.10% spread on a round-trip (buy + sell) costs 0.20% — this adds up for active strategies
• Illiquidity premium: Less liquid stocks historically earn higher returns as compensation — but the transaction costs can eat this premium

Important: Never recommend specific trades. Present liquidity data and let the user make their own decisions.

Reference Files

• references/liquidity_reference.md — Detailed formulas, extended code templates, metric interpretation guides, and academic references for all liquidity measures

Read the reference file when you need exact formulas, edge case handling, or deeper background on liquidity metrics.