Financial Data Collector

Collect and validate real financial data for US public companies using free data sources. Output is a standardized JSON file ready for consumption by other financial skills.

When to Use

Use this skill when the user wants to:

• collect filing and market data for a US public company
• prepare structured inputs for valuation work
• ground downstream analysis in sourced SEC and market data
• generate a machine-readable financial dataset instead of a narrative report

Usage

Recommended flow:

collect data
-> validate output
-> preserve source attribution
-> hand off standardized JSON to downstream analysis

For the most portable workflow, prefer the SEC helper first because it uses Python standard library only. Use the

yfinance

collector when you specifically need market data and analyst estimates.

Critical Constraints

NO FALLBACK values. If a field cannot be retrieved, set it to

null

with

_source: "missing"

. Never substitute defaults (e.g.,

beta or 1.0

). The downstream skill decides how to handle missing data.

Data source attribution is mandatory. Every data section must have a

_source

field.

CapEx sign convention: yfinance returns CapEx as negative (cash outflow). Preserve the original sign. Document the convention in output metadata. Do NOT flip signs.

yfinance FCF ≠ Investment bank FCF. yfinance FCF = Operating CF + CapEx (no SBC deduction). Flag this in output metadata so downstream DCF skills don't overstate FCF.

Workflow

Step 1: Collect Data

Run the collection script:

python scripts/collect_data.py TICKER [--years 5] [--output path/to/output.json]
python scripts/collect_data.py TICKER --engine yfinance
python scripts/collect_data.py TICKER --engine yahoo-web

The recommended collection path collects in this priority:

1. yfinance — full-quality market data, historical financials, beta, analyst estimates
2. SEC official APIs — ticker to CIK mapping, submissions, and companyfacts for filing-grounded checks
3. Yahoo web parser — low-dependency helper path for controlled environments and parser validation
4. User supplement — for years where public data returns NaN (report to user, do not guess)

SEC parsing helper:

python scripts/sec_api.py AAPL ^
  --tickers assets/sample_sec_company_tickers.json ^
  --submissions assets/sample_sec_submissions.json ^
  --companyfacts assets/sample_sec_companyfacts.json

That path is dependency-light and easier to reuse across AI coding tools.

collect_data.py

defaults to

--engine auto

, which now resolves to the

yfinance

path when the optional dependency is installed. If not installed, the script fails clearly instead of silently dropping to a weaker live path.

Step 2: Validate Data

python scripts/validate_data.py path/to/output.json

Checks: field completeness, cross-field consistency (Market Cap = Price × Shares), range sanity (WACC 5-20%, beta 0.3-3.0), sign conventions, and source attribution.

Step 3: Deliver JSON

Single file:

{TICKER}_financial_data.json

. Schema in

references/output-schema.md

.

Do NOT create: README, CSV, summary reports, or any auxiliary files.

Output Schema (Summary)

{
  "ticker": "META",
  "company_name": "Meta Platforms, Inc.",
  "data_date": "2026-03-02",
  "currency": "USD",
  "unit": "millions_usd",
  "data_sources": { "market_data": "...", "2022_to_2024": "..." },
  "market_data": { "current_price": 648.18, "shares_outstanding_millions": 2187, "market_cap_millions": 1639607, "beta_5y_monthly": 1.284 },
  "income_statement": { "2024": { "revenue": 164501, "ebit": 69380, "tax_expense": ..., "net_income": ..., "_source": "yfinance" } },
  "cash_flow": { "2024": { "operating_cash_flow": ..., "capex": -37256, "depreciation_amortization": 15498, "free_cash_flow": ..., "change_in_nwc": ..., "_source": "yfinance" } },
  "balance_sheet": { "2024": { "total_debt": 30768, "cash_and_equivalents": 77815, "net_debt": -47047, "current_assets": ..., "current_liabilities": ..., "_source": "yfinance" } },
  "wacc_inputs": { "risk_free_rate": 0.0396, "beta": 1.284, "credit_rating": null, "_source": "yfinance + ^TNX" },
  "analyst_estimates": { "revenue_next_fy": 251113, "revenue_fy_after": 295558, "eps_next_fy": 29.59, "_source": "yfinance" },
  "metadata": { "_capex_convention": "negative = cash outflow", "_fcf_note": "yfinance FCF = OperatingCF + CapEx. Does NOT deduct SBC." }
}

Full schema with all field definitions:

references/output-schema.md

<correct_patterns>

Handling Missing Years

if pd.isna(revenue):
    result[year] = {"revenue": None, "_source": "yfinance returned NaN — supplement from 10-K"}
# Report missing years to the user. Do NOT skip or fill with estimates.

CapEx Sign Preservation

capex = cash_flow.loc["Capital Expenditure", year_col]  # -37256.0
result["capex"] = float(capex)  # Preserve negative

Datetime Column Indexing

year_col = [c for c in financials.columns if c.year == target_year][0]
revenue = financials.loc["Total Revenue", year_col]

Field Name Guards

if "Total Revenue" in financials.index:
    revenue = financials.loc["Total Revenue", year_col]
elif "Revenue" in financials.index:
    revenue = financials.loc["Revenue", year_col]
else:
    revenue = None

</correct_patterns>

<common_mistakes>

Mistake 1: Default Values for Missing Data

# ❌ WRONG
beta = info.get("beta", 1.0)
growth = data.get("growth") or 0.02

# ✅ RIGHT
beta = info.get("beta")  # May be None — that's OK

Mistake 2: Assuming All Years Have Data

# ❌ WRONG — 2020-2021 may be NaN
revenue = float(financials.loc["Total Revenue", year_col])

# ✅ RIGHT
value = financials.loc["Total Revenue", year_col]
revenue = float(value) if pd.notna(value) else None

Mistake 3: Using yfinance FCF in DCF Models Directly

yfinance FCF does NOT deduct SBC. For mega-caps like META, SBC can be $20-30B/yr, making yfinance FCF ~30% higher than investment-bank FCF. Always flag this in output.

Mistake 4: Flipping CapEx Sign

# ❌ WRONG — double-negation risk downstream
capex = abs(cash_flow.loc["Capital Expenditure", year_col])

# ✅ RIGHT — preserve original, document convention
capex = float(cash_flow.loc["Capital Expenditure", year_col])  # -37256.0

</common_mistakes>

Known yfinance Pitfalls

See

references/yfinance-pitfalls.md

for detailed field mapping and workarounds.

Official SEC Sources

See

references/sec-official-sources.md

for the official SEC endpoints and how to use them in a filing-grounded workflow.