Fundamental Factor Screening

Purpose

Filter stocks using fundamental financial data (PE/PB/ROE, etc.) to build value or growth screen signals for backtesting. Supports multiple markets with different data sources.

Market Support

Market	Data Source	Method	Supported Metrics
A-shares	tushare daily_basic	extra_fields in config.json	pe, pb, pe_ttm, ps_ttm, dv_ttm, total_mv, circ_mv, roe
A-shares	Tushare statements	fundamental_fields in config.json	income, balancesheet, cashflow, fina_indicator fields
US stocks	yfinance Ticker.info	Direct API call	trailingPE, forwardPE, priceToBook, returnOnEquity, marketCap, dividendYield
HK stocks	yfinance Ticker.info	Direct API call	trailingPE, priceToBook, returnOnEquity, marketCap

Signal Logic

Value Filter (Default)

1. PE < pe_max AND PE > 0 (exclude loss-making stocks)
2. PB < pb_max
3. ROE > roe_min
4. All conditions met → long (1), otherwise → flat (0)

Growth Filter (Optional)

1. PE_TTM within reasonable range (0 < PE_TTM < pe_ttm_max)
2. ROE > roe_min (profitability floor)
3. Market cap > mv_min (exclude micro-caps)

A-Share Usage (tushare)

config.json

{
  "source": "tushare",
  "codes": ["000001.SZ", "600036.SH", "000858.SZ"],
  "start_date": "2023-01-01",
  "end_date": "2024-12-31",
  "extra_fields": ["pe", "pb", "pe_ttm", "roe", "total_mv"],
  "initial_cash": 1000000,
  "commission": 0.001
}

The extra_fields columns are automatically merged into the daily DataFrame by the DataLoader.

A-Share Statement Pre-Filter

Use fundamental_fields when the strategy needs PIT-safe financial statement data instead of daily valuation fields:

{
  "source": "tushare",
  "codes": ["000001.SZ", "600036.SH", "000858.SZ"],
  "start_date": "2023-01-01",
  "end_date": "2024-12-31",
  "fundamental_fields": {
    "income": ["total_revenue", "n_income"],
    "balancesheet": ["total_hldr_eqy_exc_min_int"],
    "fina_indicator": ["roe", "debt_to_assets"]
  },
  "initial_cash": 1000000,
  "commission": 0.001
}

The backtest runner queries the configured tables through TushareFundamentalProvider and merges each published statement snapshot into daily bars only after its announcement/disclosure date. Statement columns are prefixed by table name:

Requested field	SignalEngine column
income.total_revenue	income_total_revenue
income.n_income	income_n_income
balancesheet.total_hldr_eqy_exc_min_int	balancesheet_total_hldr_eqy_exc_min_int
fina_indicator.roe	fina_indicator_roe

Representative financial-quality pre-filter:

revenue = row.get("income_total_revenue")
profit = row.get("income_n_income")
net_assets = row.get("balancesheet_total_hldr_eqy_exc_min_int")
roe = row.get("fina_indicator_roe")

passes = (
    revenue is not None and revenue > 0
    and profit is not None and profit > 0
    and net_assets is not None and net_assets > 0
    and roe is not None and roe >= 8.0
)

HK/US Stock Usage (yfinance)

For HK/US stocks, fundamental data is not available as daily time-series via the backtest loader. Instead, use yfinance Ticker info for point-in-time screening:

import yfinance as yf

def screen_us_stocks(tickers, criteria):
    """Screen US/HK stocks by fundamental criteria."""
    passed = []
    for symbol in tickers:
        info = yf.Ticker(symbol).info
        pe = info.get("trailingPE")
        pb = info.get("priceToBook")
        roe = info.get("returnOnEquity")  # Decimal (e.g., 0.25 = 25%)
        mcap = info.get("marketCap")

        if pe is None or pb is None or roe is None:
            continue  # Skip stocks with missing data

        if (0 < pe < criteria["pe_max"]
            and pb < criteria["pb_max"]
            and roe > criteria["roe_min"]
            and (mcap or 0) > criteria.get("mcap_min", 0)):
            passed.append({
                "symbol": symbol,
                "pe": pe,
                "pb": pb,
                "roe": round(roe * 100, 1),  # Convert to percentage
                "mcap": mcap,
            })

    return passed

# Example: screen S&P 500 components
criteria = {"pe_max": 20, "pb_max": 3.0, "roe_min": 0.08, "mcap_min": 10_000_000_000}
results = screen_us_stocks(["AAPL", "MSFT", "JNJ", "JPM", "XOM"], criteria)

HK Stock Screening

# HK stocks use the same yfinance interface
hk_tickers = ["0700.HK", "9988.HK", "1810.HK", "2318.HK", "0005.HK"]
results = screen_us_stocks(hk_tickers, criteria)  # Same function works

Parameters

Parameter	Default	Description
pe_max	20.0	PE ceiling (exclude overvalued)
pb_max	3.0	PB ceiling
roe_min	8.0	ROE floor (%), exclude low-profitability
pe_min	0.0	PE floor (exclude loss-making stocks)
mcap_min	0	Market cap floor (for US/HK, in USD)

Common Pitfalls

• extra_fields columns may contain NaN (new listings, ST stocks) — must fillna or dropna
• fundamental_fields columns are prefixed by table and may be NaN before the first statement is published in the backtest window
• fundamental_fields is daily-only: an announcement date has no time of day, so an intraday interval is rejected rather than silently making a filing visible from the first bar of its own announcement day. "fundamental_subdaily": "next_day" opts in, with day D's filing visible from the first bar of D+1
• Do not forward-fill statement rows manually before their ann_date / f_ann_date; the runner's merge already enforces point-in-time visibility
• Negative PE means loss-making — always filter with pe > 0
• ROE units differ: tushare uses percentage (e.g., 15 = 15%), yfinance uses decimal (e.g., 0.15 = 15%)
• For portfolio strategies: N stocks passing the screen each get weight 1/N
• yfinance Ticker.info is a point-in-time snapshot, not historical time-series — cannot directly use for daily rebalancing backtests on US/HK stocks
• For US/HK daily fundamental backtests, consider using the screening results as a stock universe, then applying technical signals within that universe

Dependencies

pip install pandas numpy yfinance

Signal Convention

• 1/N = selected for long (N = number of stocks passing the screen), 0 = not selected