Package deepvalue on DUB

A small, dependency-free D library for deep-value and net-net stock screening: net current asset value (NCAV), net-net working capital, Graham number, margin of safety, and Graham-style balance-sheet checks.

To use this package, run the following command in your project's root directory:

deepvalue

A small, dependency-free D library for deep-value and net-net stock screening — the balance-sheet math Benjamin Graham used to buy companies below liquidation value.

It turns the line items on a balance sheet and income statement into the handful of numbers a value screener actually checks, with no external dependencies and every function @safe pure.

The screening model and thresholds mirror the one published at deepvalueradar.com.

What it computes

Function	Meaning
`ncav(currentAssets, totalLiabilities)`	Net current asset value — Graham's liquidation floor.
`ncavPerShare(...)`	NCAV spread over the diluted share count.
`netNetWorkingCapital(cash, receivables, inventory, liabilities, preferred)`	Graham's NNWC, haircutting receivables to 75% and inventory to 50%.
`isNetNet(price, ncavPerShare)`	True when price is below ⅔ of NCAV/share (a "net-net").
`grahamNumber(eps, bvps)`	`sqrt(22.5 · EPS · BVPS)` — the defensive-investor fair-value ceiling.
`marginOfSafety(price, intrinsic)`	Discount of price to an intrinsic value.
`priceToEarnings(price, eps)` / `priceToBook(price, bvps)`	The two defensive-investor valuation ratios.
`piotroskiFScore(inputs)`	A 0–9 balance-sheet quality score to weed out value traps.
`grahamDefensiveChecks(...)`	P/E ≤ 15, P/B ≤ 1.5, current ratio ≥ 2.0, and long-term debt ≤ working capital.

Why the constants

The Graham number's 22.5 is 15 · 1.5 — Graham's twin defensive rules that a stock should trade below a P/E of 15 and a price-to-book of 1.5. The grahamDefensiveChecks thresholds (P/E ≤ 15, P/B ≤ 1.5, current ratio ≥ 2.0) come straight from the classic defensive-investor criteria.

Usage

import deepvalue;

// Is this a Graham net-net?
immutable nps = ncavPerShare(500_000, 300_000, 40_000); // = 5.00 / share
immutable cheap = isNetNet(3.00, nps);                  // price < 2/3 * 5 = 3.33 -> true

// Fair-value ceiling and margin of safety.
immutable fair = grahamNumber(3.0, 30.0);   // sqrt(22.5*3*30) = 45.0
immutable mos  = marginOfSafety(36.0, fair); // (45-36)/45 = 0.20 -> 20% margin

// Full defensive screen.
auto verdict = grahamDefensiveChecks(
    /* price */ 20.0, /* eps */ 2.0, /* bvps */ 16.0,
    /* current assets */ 400.0, /* current liabilities */ 150.0,
    /* long-term debt */ 100.0);
assert(verdict.passes);

// Quality overlay to avoid value traps.
PiotroskiInputs f = { netIncome: 120, operatingCashFlow: 150, /* ... */ };
immutable score = piotroskiFScore(f); // 0..9

Build & test

dub build --compiler=ldc2
dub test  --compiler=ldc2

0.1.0	2026-Jul-16
~main	2026-Jul-16

deepvalue ~main

deepvalue

What it computes

Why the constants

Usage

Build & test

License