Sharia share screening: the business and financial ratio tests

Why screening exists at all

If you buy a share, you own a slice of a business. That is the starting principle, and it is why equity ownership is treated as a natural fit for Islamic finance — you are a partner in a venture, exposed to its gains and losses, which is exactly the risk-sharing shape the system prefers.

The complication is that almost no listed company is pure. A supermarket chain sells alcohol somewhere in its range. A manufacturer has a bank facility. An airline holds cash in an interest-bearing account. A hotel group has a bar. If the standard were absolute purity, the investable universe would be close to empty, and the practical effect would be to push observant investors out of equity markets entirely — which is not what the rules are for.

Screening is the compromise. It accepts that a shareholder does not control day-to-day management, applies limits on how much impermissible activity can be tolerated inside an otherwise acceptable business, and pairs those limits with a requirement to dispose of the tainted portion of income. The thresholds are the product of scholarly reasoning and judgement, not scriptural text — which is precisely why different bodies land in different places.

Screens run in two gates. The first asks what the company does. The second asks how it is financed. A company must pass both.

Gate one — what the business actually does

The activity screen excludes companies whose core business is impermissible. The list is broadly consistent across providers, and the written standards on dealing in shares set out the conditionsSource^source.

Typically excluded core activities:

• Conventional banking, insurance and other interest-based financial services
• Alcohol production and distribution
• Pork products
• Gambling, casinos and betting
• Adult entertainment
• Tobacco, in most methodologies
• Weapons and defence, in some methodologies but not all
• Conventional derivatives and interest-bearing securities as a primary business

The exclusions are easy to state and harder to apply, because real companies are mixed. Three examples that force the issue:

**A hotel group.** Its core business is accommodation, which is fine. But it earns revenue from minibar sales, bar service and possibly a casino floor. Is it a hotel company with incidental alcohol income, or a hospitality-and-gaming company? Providers answer this by measuring the impermissible revenue as a share of total revenue and applying a tolerance threshold. Below the threshold it passes with purification required; above it, the company is excluded outright.

**An airline.** Its business is transport. It serves alcohol on board. Almost every methodology treats this as incidental, because the revenue attributable to it is trivially small relative to ticket sales. The screen catches it in the impure-income calculation rather than excluding the company.

**A diversified conglomerate.** It owns a food business, a logistics arm and a conventional insurance subsidiary. Here the answer depends on segment reporting. If the insurance arm's revenue is material, the conglomerate fails. If it is a small legacy holding, it may pass with purification. This is why screens rely on segment-level financial disclosure and why companies with poor segment reporting are sometimes excluded for lack of data rather than for anything they do.

The general shape of the tolerance is that revenue from non-core impermissible activity must stay small — commonly cited limits sit around five percent of total revenue, though the exact figure and the exact definition of the denominator vary by provider. Check your provider's published methodology rather than assuming a number.

Gate two — the financial ratio tests

A company can pass the activity gate and still fail. The financial screens exist because a company loaded with interest-bearing debt is, in substance, passing a great deal of riba-based finance through to its shareholders even if its products are unobjectionable.

Three ratios do most of the work. A fourth appears in some methodologies.

The debt ratio

This measures interest-bearing debt against a size denominator. The reasoning is that a business financed overwhelmingly by conventional borrowing is deriving a large part of its returns from a structure the system objects to.

Commonly used limits cluster around a third — that is, interest-bearing debt should not exceed roughly a third of the chosen denominator. The denominator is where providers diverge, and it matters enormously. Some use trailing average market capitalisation. Some use total assets. Standards bodies and index providers publish these choices explicitlySource^source.

The interest-bearing securities and cash ratio

This measures cash plus interest-bearing investments against the same denominator, with a limit typically also around a third. The logic is symmetric to the debt test. A company sitting on an enormous pile of cash in conventional deposits is running an interest-earning operation alongside its stated business.

This ratio catches companies you would not expect. A profitable technology firm that has accumulated years of cash without deploying it can fail this test while carrying no debt at all and selling a perfectly permissible product.

The receivables or illiquidity ratio

This measures accounts receivable — or in stricter versions, total liquid assets — against the denominator. The reasoning here is different and more technical. It draws on the rules for trading debt and monetary claims, which cannot be exchanged at anything other than par. If a company is essentially a bundle of receivables, buying its shares starts to look like trading debt at a premium or discount rather than trading a real business.

Not every methodology applies this test, and among those that do the threshold varies more than the others. Some set it near a third; more conservative approaches require that tangible assets exceed liquid assets.

The impure income threshold

Separately from the activity gate, providers cap total income from impermissible sources — interest received, incidental alcohol sales, dividends from non-compliant subsidiaries — usually at around five percent of total revenue or total income. Passing this threshold is what makes purification possible rather than mandatory divestment. Above it, the company is out.

Screening a hypothetical company end to end

Take a fictional company. Call it Northwind Logistics. Suppose it reports the following for a financial year, all figures hypothetical:

• Total revenue 2,000 million
• Revenue from a small in-house vehicle insurance arm 60 million
• Interest income on deposits 14 million
• Interest-bearing debt 900 million
• Cash and interest-bearing investments 700 million
• Accounts receivable 800 million
• Total assets 3,400 million
• Trailing average market capitalisation 3,000 million

**Gate one.** Core business is freight and logistics — permissible. The insurance arm is conventional insurance, which is an excluded activity, so it must be measured. It is 60 of 2,000, or 3.0% of revenue. Under a 5% tolerance it passes, but the income is impure and must be purified.

**Debt ratio.** 900 against a 3,000 market cap denominator is 30.0%. Against a 3,400 total assets denominator it is 26.5%. Under a roughly one-third limit, it passes either way — though notice how close the market cap version runs. If the share price fell by 15%, the market cap denominator would drop to 2,550 and the ratio would rise to 35.3%, failing the test. The business would not have changed at all.

**Cash and interest-bearing securities.** 700 against 3,000 is 23.3%; against 3,400 it is 20.6%. Passes.

**Receivables.** 800 against 3,000 is 26.7%; against 3,400 it is 23.5%. Passes under a one-third limit, though a stricter tangible-assets test would need separate calculation.

**Impure income.** 60 million of insurance revenue plus 14 million of interest income is 74 million against 2,000 million total revenue, or 3.7%. Under a 5% cap it passes, and 3.7% is the figure that drives purification.

Northwind passes the screen. But the exercise shows two things the label alone would hide. First, its debt ratio is close enough to the line that ordinary share price movement could flip it. Second, roughly one dividend riyal in twenty-seven is attributable to impure income and needs to be given away.

Why two good providers disagree

If you have ever seen a company appear on one compliant list and not another, here is why.

1. **Different denominators.** Market capitalisation is volatile; total assets are stable. A company can pass on assets and fail on market cap simultaneously. This is the single largest source of divergence.
2. **Different averaging windows.** Providers that use market cap typically use a trailing average — twelve months, twenty-four months, or a point-in-time figure. Each produces a different answer.
3. **Different thresholds.** The limits are scholarly judgements. Boards that weight caution differently set them differently.
4. **Different treatment of the receivables test.** Some apply it, some do not, and among those that do the definitions differ.
5. **Different review frequency.** Quarterly rebalancing versus annual review means the same company can be in one universe and out of another for months purely because of timing.
6. **Different data sources and fiscal year alignment.** Companies report on different calendars; providers make different choices about which filing to use.

None of this means screening is arbitrary. It means it is a documented procedure with contestable inputs, and international standards on Shari'ah governance treat disclosure of that methodology as an expectation for institutions offering compliant productsSource^source. Your reasonable response is to pick a methodology whose reasoning you accept, understand its choices, and apply it consistently — rather than shopping between providers until one gives you the answer you wanted.

What screening does not tell you

This is where the most common misreading happens.

• **It is not a quality signal.** A company can pass every screen and be badly run, overpriced, or in structural decline. Compliance and investment merit are orthogonal.
• **It is not an ethical audit.** Screens do not measure labour practices, environmental damage, tax conduct or governance quality. A company with an unblemished screening result may behave in ways you find objectionable. If those matter to you, they are a separate layer you apply yourself.
• **It is not permanent.** Screens are point-in-time. A pass this quarter is not a pass next quarter.
• **It does not eliminate purification.** Passing means the impure portion is small enough to be tolerated and cleaned, not that it is zero.
• **It does not settle the derivatives question.** Screening addresses the underlying company, not the instrument you use to gain exposure. Options, futures and margin arrangements raise separate issues.
• **It is not a substitute for diversification or for affordability.** A screened universe is still a universe of risky assets that can fall in value.

Screening is a filter, not a recommendation. Everything that determines whether an investment is sensible for you — price, concentration, time horizon, whether you can afford to lose the money — sits entirely outside the screen and remains your responsibility to assess.

When a holding drops off the list

This will happen if you hold shares for any length of time, and it is worth having a diagnostic ready rather than reacting blindly. Work through in order.

1. **Did the business change?** An acquisition, a new segment, a disposal. This is the substantive case.
2. **Did the balance sheet change?** New borrowing, a large cash build-up, a change in receivables. Also substantive.
3. **Did the share price fall?** If your provider uses a market cap denominator, a price decline alone can push the debt ratio over the line with no operational change whatsoever. This is a methodology artefact, and the mainstream view is that it still requires a response, but it should change how you think about the cause.
4. **Did the provider change its methodology or rebalancing date?** Check the published methodology notes.
5. **Is it a data or timing issue?** A late filing or a fiscal year alignment change can move a company temporarily.

On what to do next, opinions differ. A common approach is a grace period — allow a defined window, often to the next review date, to see whether the failure is temporary, purify any income received in the meantime, and divest if the failure persists. Some scholars require prompt disposal on failure. Some require that any gain attributable to the non-compliant period also be purified rather than kept. Your provider's Shari'ah board will have a stated position; find it before you need it.

A workable routine

• Choose one screening methodology and read its published document rather than the marketing page.
• Record which denominator it uses, its thresholds, and its rebalancing schedule.
• Re-check holdings at each rebalance, not continuously.
• Track impure income percentages as you go, so purification is a calculation rather than an archaeology project at year end.
• Keep a written note of what you did and why. If you ever put the question to a scholar, they will ask.

Screening rewards understanding the procedure far more than it rewards trusting the label. If a specific holding raises a question you cannot resolve from the methodology document, that is the point to ask someone qualified — with the company's actual figures in front of you.