revenue-model-builder

中文文档：README-zh.md

A bottom-up revenue forecasting framework — turn a driver tree (market_base × penetration × share × price) into an auditable revenue model that aligns to reported totals via a structural residual line. Core engine has zero third-party dependencies (pure Python stdlib), including the Monte Carlo + sensitivity layer.

The design encodes five hard-won modeling rules (see design principles): a structural residual that absorbs un-modeled business, A/B/C data grading for traceability, incremental (not growth-rate) penetration forecasts, a certainty pyramid for prioritizing forecast inputs, and a history-first workflow.

Why

Most open-source finance tooling covers trading / backtesting (zipline, backtrader, QuantLib) or DCF valuation. Driver-based revenue forecasting — decomposing revenue into base × penetration × share × price, what sell-side analysts and PE associates actually do — has almost no open-source presence.

The closest neighbors are TAM/SAM/SOM prompt skills for AI agents (e.g. slgoodrich/agents, deanpeters/Product-Manager-Skills) — they describe the methodology in natural language, but none is a runnable engine. This project is: a minimal, pip-installable encoding of the workflow with the math enforced in code rather than left to a prompt.

A sell-side revenue model lives or dies on whether you can defend every number — "where did this penetration come from? why isn't it higher?" Manual spreadsheets answer that with cryptic comments. revenue-model-builder makes it structural: every driver carries a credibility grade and a source, the residual is a first-class line, and an alignment check catches the classic "back-solved penetration" trap before it poisons the forecast.

How it compares

Core idea

segment_revenue = market_base × penetration × share × price
total_revenue   = Σ(segments) + residual          # residual absorbs un-modeled biz

Unit derivation: base in million units × price in yuan = million yuan (when penetration & share are fractions in [0,1]). So Segment.revenue() returns million yuan by construction.

Install

pip install -e .                  # core engine only (pure stdlib, zero deps)
pip install -e ".[excel]"         # + openpyxl, to render .xlsx output
pip install -e ".[docx]"          # + python-docx & matplotlib, to render .docx memos
pip install -e ".[dev]"           # + pytest, to run the test suite
pip install -e ".[backtest]"      # + statsmodels, for Holt/ARIMA backtesting

Quick start

Build a model and validate it aligns to reported totals:

from revenue_model import Driver, Segment, RevenueModel, BASE, PENETRATION, SHARE, PRICE

seg = Segment(
    name="cockpit-domestic",
    base=Driver("China passenger car sales", BASE, {2022: 22.0, 2023: 23.0},
                level="A", unit="million units", source="CAAM"),
    penetration=Driver("DMS penetration", PENETRATION, {2022: 0.04, 2023: 0.06},
                       level="B", unit="fraction", source="research institute"),
    share=Driver("market share", SHARE, {2022: 0.10, 2023: 0.12},
                 level="C", unit="fraction", source="estimate"),
    price=Driver("ASP", PRICE, {2022: 600, 2023: 620},
                 level="C", unit="yuan", source="benchmark"),
)
model = RevenueModel("DemoCo", [seg], total_revenue={2022: 110.0, 2023: 215.0})

for r in model.validate_all():
    print(r.year, f"segments={r.segment_sum:.1f}", f"residual={r.residual:.1f}",
          f"({r.residual_ratio:.0%})", r.warnings)

Run the fictional demo (NovaTech, an automotive-AI company — all data fabricated):

python -m revenue_model.demo

Render the model to a formatted .xlsx (needs the [excel] extra):

python -m revenue_model.excel_builder output.xlsx

Render the model to a Word research memo (.docx) (needs the [docx] extra):

Language: the memo is bilingual — lang="en" (default, for the global / PyPI audience) or lang="zh" (中文版). Every memo carries a footnote showing the active language and how to switch.

from revenue_model.docx_builder import build_docx

build_docx(model, "memo.docx", lang="en")            # English (default)
build_docx(model, "memo_zh.docx", lang="zh")         # 中文版

Or via CLI:

python -m revenue_model docx -o memo.docx --lang en      # default
python -m revenue_model docx -o memo.docx --lang zh      # 中文版
python -m revenue_model docx -o memo.docx --no-charts    # tables only (skip matplotlib)

The 7-section memo — Executive Summary → Company & Segment Overview → ABC-graded Driver Tables → Residual Alignment → Uncertainty & Scenarios (with embedded Monte Carlo distribution / tornado / forecast charts) → Limitations → Methodology — is the narrative counterpart to the Excel working paper. Two honest defaults: ranges=None flags the default ±10% Monte Carlo bands as illustrative; forecast_years=None produces a historical-only memo (or a [not yet populated] alarm if passed unfilled) — never silent.

Build a model from tushare (A-share, NEV / intelligent-driving):

The structured-data adapter auto-fills total_revenue from tushare's income statement and seeds intelligent-driving segment drivers from an industry template (智能驾驶 / 智能座舱; values are [adapter] placeholders for you to fill — the machine gives the anchor + structure, the analyst fills the C-grade driver values).

from revenue_model.tushare_adapter import build_model_from_tushare
# load token via your secrets manager; never hardcode
model = build_model_from_tushare("002405.SZ", token=TUSHARE_TOKEN)

Or via CLI:

TUSHARE_TOKEN=... python -m revenue_model tushare 002405.SZ
python -m revenue_model tushare 002405.SZ --token ... --years 2020 2021 2022

Verified end-to-end on 德赛西威 (002405.SZ): 20 years of real revenue pulled and aligned as the residual anchor.

US equities via SEC EDGAR (no key needed — SEC is public):

from revenue_model.sec_adapter import build_model_from_sec
model = build_model_from_sec("NVDA")   # US ticker

HK equities via AKShare (needs the [data] extra):

from revenue_model.akshare_adapter import build_model_from_akshare
model = build_model_from_akshare("01211")   # HK code, e.g. 比亚迪股份

Or via CLI: python -m revenue_model sec NVDA / akshare 01211.

Reported segment revenue via stockanalysis.com (needs the [scrape] extra — playwright; SEC XBRL segment tags vary per issuer, so this fills the gap sec_adapter leaves):

from revenue_model.sa_adapter import build_model_from_sa
model = build_model_from_sa("NVDA")   # pulls Compute & Networking + Graphics

The three total-revenue adapters (tushare / sec / akshare) fill total_revenue from structured official sources and seed intelligent-driving segment drivers as placeholders. The segment adapter (sa) additionally fills each Segment's reported_revenue A-grade anchor (history-first, Principle 5); drivers stay as the forecast layer a human fills. Verified: NVDA FY22-FY26, Σ reported segments == total.

Quarterly market-platform detail via q4cdn IR PDFs (needs the [pdf] extra — PyMuPDF; some companies publish a finer "Revenue by Market Platform" PDF supplement on Q4 Inc's CDN, e.g. NVDA's "Rev by Mkt Qtrly Trend"):

from revenue_model.q4cdn_adapter import fetch_market_platform, fiscal_year_rollup
# Quarterly granularity (Q1FY25..Q1FY27) + sub-market splits (Hyperscale / ACIE / Edge)
data, quarters = fetch_market_platform(url)
dc_annual, dc_complete = fiscal_year_rollup(data["Data Center"])   # quarters -> FY; dc_complete = years with all 4 quarters

Quarterly granularity and sub-market detail the annual adapters can't reach. The market-platform caliber differs from the business-segment caliber, so this adapter is a data layer (no build_model_*) — see examples/web_scraping/.

Caching — the network adapters (sec / sa / q4cdn) cache their raw fetches to disk (default ~/.cache/rmb/; override via RMB_CACHE_DIR, e.g. RMB_CACHE_DIR=D:\rmb_cache). Repeat calls read the cache instead of re-fetching (faster, fewer requests, warm-cache works offline); refresh=True forces a re-fetch. Injectable getters bypass the cache so tests stay offline.

Monte Carlo & sensitivity

Turn point forecasts into distributions and find out which assumption matters most — pure stdlib, no numpy:

from revenue_model import simulate_model, tornado

# Revenue distribution: sample uncertain drivers, multiply, repeat
mc = simulate_model(model, 2024, {
    "market share": (0.10, 0.18),      # C-grade, wide band
    "ASP": (620, 680),
}, n=20000, seed=0)
print(mc.median, mc.percentiles["p5"], mc.percentiles["p95"])  # P5/median/P95

# Tornado: per-driver bands (NOT a uniform %) -> ranked swing
for it in tornado(seg, 2024, {
    "China passenger car sales": (23.5, 24.5),   # A-grade, narrow
    "DMS penetration": (0.07, 0.12),             # B-grade
    "market share": (0.10, 0.18),                # C-grade, wide
    "ASP": (620, 680),
}):
    print(f"{it.driver:28s} swing {it.swing:.1f}")

Why per-driver bands, not a uniform ±%? Revenue is a product (base × pen × share × price), so perturbing every factor by the same percentage yields identical swings — the tornado would have zero discriminating power. A tornado is only meaningful when each band reflects that driver's real uncertainty: narrow for A-grade hard data, wide for C-grade estimates. (This is why A/B/C grading and sensitivity are linked.)

Stochastic processes (experimental)

Upgrade uniform-sampling Monte Carlo to driver-specific stochastic processes — pure stdlib, no numpy. Prices follow geometric Brownian motion; bounded ratios (penetration, share) follow a logit-OU process that stays in (0, 1); drivers can be correlated via Cholesky.

from revenue_model.stochastic import (
    GBMDriver, LogitOUDriver, CorrelatedBundle, simulate_revenue, logit)

price = GBMDriver("ASP", S0=650.0, mu=0.03, sigma=0.10)                # log-normal price
share = LogitOUDriver("market share", p0=0.14, theta=2.0,
                      mu_bar=logit(0.18), sigma=0.10)                  # bounded, mean-reverting
bundle = CorrelatedBundle([price, share], rho=[[1.0, -0.3], [-0.3, 1.0]])

mc = simulate_revenue(segment, 2024, bundle, n=20000, seed=0)         # -> MCResult
print(mc.median, mc.percentiles["p5"], mc.percentiles["p95"])

See design principles: stochastic layer for the SDEs and why logit-OU keeps bounded ratios bounded.

Experimental — the uniform Monte Carlo above remains the default. See tests/test_stochastic.py for analytic-solution validation (GBM mean, OU stationary variance, induced correlation).

Backtesting

How accurate is a revenue forecast, really? The backtest extra answers that with honest out-of-sample evaluation — fit on history, predict the next year, slide the window forward, and never let a method see the value it must predict.

Five methods head-to-head: Naive (random walk — the benchmark to beat), Linear trend, CAGR (log-linear / constant-growth), Holt exponential smoothing, and ARIMA. Pure-stdlib metrics (sMAPE / MAPE / MAE / RMSE / R² / directional accuracy); sMAPE is the headline number because it stays robust across companies of very different sizes. Naive / Linear / CAGR need nothing; Holt / ARIMA lazy-import statsmodels.

from revenue_model.backtest import (
    Naive, LinearTrend, LogLinearCAGR, HoltLinear, ARIMA,
    rolling_backtest, evaluate, score_table,
)

steps = rolling_backtest(
    years, values,
    [Naive(), LinearTrend(), LogLinearCAGR(), HoltLinear(), ARIMA()],
    min_train=8, horizon=1)
print(score_table(evaluate(steps)))

Real A-share data loads through the data extra (akshare, cached as CSV for reproducibility). Ten companies spanning six growth regimes:

What this teaches about the framework itself. On the revenue total level, adaptive statistical methods dominate fixed trends — high-growth names grow exponentially, so a linear fit systematically under-predicts and even gets the direction wrong. The value of the driver decomposition is therefore not "guess the total more accurately" (statistics does that better) but locating structure: which segment rides a trend and which rides a one-off event (e.g. Luxun's 2025 Leoni acquisition — invisible to any aggregate method). Accuracy and interpretability are complements, not substitutes. See examples/backtest_demo/.

NVIDIA demo — where driver trees work, and where they break

The first U.S.-equity demo. NVIDIA is a deliberately two-faced test: same company, same base × penetration × share × price tree, same engine — Gaming hold-out sMAPE 1.0% (mature trend market) vs Data Center 60% (AI regime shift; FY2025 actual $115.2B vs forecast $18.4B). The demo then closes the loop with a Monte Carlo scenario band whose Bull tail frames the actual where the point forecast collapsed.

Accuracy is a property of the industry, not the model. See examples/nvda_demo/ and the flagship methodology doc docs/industry-fit-analysis.md — the industry-fit matrix, five techniques for event-driven growth, and why this library chooses honesty over false precision.

Segment extraction (from annual reports)

Automate the tedious part of segment build-up — pull a segment skeleton (business lines, revenue, share, YoY, margin, a driver-type tag, driver hints) out of an annual report's "main business analysis" text via an LLM. Pure stdlib HTTP (no SDK); the LLM call is injectable, so tests/CI need no API key.

from revenue_model import extract_segments, alignment_check

# text = the "main business analysis" section (extracted upstream via PyMuPDF)
parsed = extract_segments(text, api_key="<your-llm-key>")   # load via secrets manager
print(parsed["segments"])                                   # segment skeletons
print(alignment_check(parsed))                             # Σ + residual ≈ reported total

The output matches the schema in docs/proposal-segment-extraction.md §4. Filling concrete driver values (C-grade estimates) remains a human step — see the proposal's semi-automated boundary (§7). Proprietary / non-public company data must not enter the repo; real-company demos (Luxun, NVIDIA) use only public disclosures (see DISCLAIMER.md). The fictional NovaTech is the zero-real-data default.

News-impact validation (8-K events + honest event studies)

Direction-3 asked whether filing events can improve revenue forecasts. The answer, after a six-company pooled validation (NVDA / AMD / SDGR / REGN / GILD / GM, 409 8-K events, 2019-2026): not at monthly granularity for large caps — a seductive single-company p-value (SDGR p = 0.033) dissolved under pooling, market adjustment and multiplicity control. The full story, including two sec_adapter data bugs the rebuild uncovered, is in docs/news-impact-validation.md.

What ships from the exercise:

from revenue_model import form8k_adapter, news_impact, sec_adapter
from datetime import date

events = form8k_adapter.fetch_8k_events("NVDA", since=date(2019, 1, 1))
# [{"date": ..., "category": "Earnings"|"Agreement"|"M&A"|..., "items": ...}]

quarters = sec_adapter.fetch_fiscal_quarters(cik)   # fiscal-year general,
# concept-merged single quarters (NVDA's late-Jan FY handled; incomplete
# trailing years excluded)

res = news_impact.event_study(
    events_by_sample={"NVDA": [(e["date"], e["category"]) for e in events],
                      "AMD": ...},                  # pool, never one issuer
    outcomes_by_sample={"NVDA": {q[2]: q[3] for q in quarters_yoy}, ...},
    min_n=8)                                          # small n -> note, no test
# res.rows[i].welch_p / mwu_p / significant / bonferroni_significant

• form8k_adapter — 8-K events from SEC's submissions API: universal coverage, official item classification, no key, cached, http_get injectable.
• news_impact — pure-stdlib Welch t + Mann-Whitney U (scipy-verified), pooled event studies with automatic Bonferroni family correction and small-sample guards.
• sec_adapter fixes — revenue-concept switching no longer drops years; YTD/discrete period collisions no longer corrupt single-quarter differencing; new fetch_fiscal_quarters() builds fiscal-general quarterly series.

Design principles

Plus a validation layer (triangulation, assumption documentation, S-curves): docs/design-principles.md.

API

Driver(name, kind, values, level="C", unit="", source="")
#   kind ∈ {BASE, PENETRATION, SHARE, PRICE};  level ∈ {"A","B","C"}

Segment(name, base, penetration, share, price)
#   .revenue(year) -> float  (million yuan)

implied_driver(segment, year, target_revenue, solve_kind) -> float
#   calibrate one driver to a known revenue (e.g. reported segment revenue);
#   prefer solve_kind=PRICE/BASE over PENETRATION (avoids the back-solve trap)

RevenueModel(company, segments, total_revenue)
#   .validate(year)  -> YearResult   (segment_revenues, residual, warnings)
#   .validate_all()  -> list[YearResult]

simulate_segment(segment, year, ranges, n=10000, seed=0) -> MCResult
simulate_model(model, year, ranges, n=10000, seed=0)     -> MCResult
#   ranges: {driver_name: (low, high)};  MCResult has mean/median/stdev/percentiles

tornado(segment, year, ranges) -> list[SensitivityItem]   # ranked by swing

scenarios(mc, *, bear_p=0.10, bull_p=0.90) -> list[Scenario]  # Bear/Base/Bull from the distribution

extract_segments(text, *, api_key=None, llm=None) -> dict  # segment skeleton from annual report
alignment_check(parsed) -> dict                            # Σ + residual ≈ reported total

Project structure

revenue-model-builder/
├── revenue_model/
│   ├── driver.py        # Driver — one factor (base/pen/share/price) + ABC grade
│   ├── segment.py       # Segment — revenue = base × pen × share × price
│   ├── model.py         # RevenueModel — residual + alignment validation
│   ├── monte_carlo.py   # revenue distribution + tornado sensitivity (pure stdlib)
│   ├── extractor.py     # annual-report text -> segment skeleton (LLM, pure stdlib)
│   ├── excel_builder.py # render to .xlsx (ABC colors, IF formulas, residual)
│   ├── docx_builder.py  # render to .docx research memo (bilingual, ABC, charts)
│   ├── backtest/        # out-of-sample backtesting (metrics / methods / rolling / data)
│   ├── form8k_adapter.py # 8-K filing events from SEC submissions (item-classified)
│   ├── news_impact.py   # honest event studies: Welch/MWU (stdlib) + Bonferroni guards
│   └── demo.py          # NovaTech fictional example
├── tests/               # 240 tests — formula, validation, residual, MC, tornado, extractor, backtest, docx, i18n, tushare/sec/akshare/sa/q4cdn/ir/form8k adapters + cache + news_impact
├── docs/
│   └── design-principles.md
└── pyproject.toml

Roadmap

• Monte Carlo revenue distribution + sensitivity (tornado) analysis
• Segment skeleton extraction from annual-report text (LLM)
• Driver extrapolation API (incremental / logistic / trend-fit)
• Driver value estimation (C-grade, from industry data)
• Bear / Base / Bull scenarios (sliced from the Monte Carlo distribution)
• Multi-market data source adapters (A股 tushare / 美股 SEC EDGAR / 港股 AKShare)
• Automated driver extraction from annual-report text
• Reported segment-revenue adapter (stockanalysis.com via playwright, [scrape] extra)
• q4cdn IR-PDF adapter (quarterly market-platform detail, [pdf] extra)
• Word memo builder (.docx research memo, bilingual, with embedded charts)
• PyPI release
• Visualization charts (distribution / tornado / waterfall / forecast)
• Interactive Streamlit app (driver sliders -> live charts)
• Backtesting — out-of-sample method comparison (Naive / Linear / CAGR / Holt / ARIMA)
• News-impact validation (8-K event layer + honest pooled event studies; monthly/large-cap null documented)

Who is this for

Sell-side research, PE/VC investment teams, equity analysts, and students of fundamental analysis who want a reusable, auditable revenue-modeling scaffold rather than rebuilding the same spreadsheet structure by hand.

License & disclaimer

MIT — see LICENSE. This is a research/education tool, not investment advice — full statement in DISCLAIMER.md.