Why Two Halal Screeners Disagree About the Same Stock

You look up a stock on one halal screener and it says compliant. You check a second and it says doubtful. A third says avoid. Same company, same day, three different answers. So who is right - and what are you supposed to do with that?

The honest answer is that none of them is lying to you. A halal screen is not a single fixed law applied the same way everywhere. It is a set of choices - which standard, which numbers, measured against what, and how often. Change one of those choices and a borderline stock can flip from pass to fail without the business doing anything at all. Here are the four reasons screeners disagree, and how to read the disagreement instead of being paralysed by it.

1. They use different thresholds

Most modern screens trace back to AAOIFI, the standard-setting body whose financial ratios are the common starting point. But not everyone draws the line in the same place. A strict AAOIFI-style screen caps interest-bearing debt at 30% of the measure it uses. The widely followed Dow Jones Islamic Market methodology allows up to 33.33%. That gap sounds tiny until a stock sits between the two.

Take PPG Industries. On our own screen as at early October, PPG's interest-bearing debt was 33.7% of its market capitalisation. Against a 30% line it fails. Against a 33.33% line it still fails, but only just - and a company sitting at 31% would clear the looser standard and fail the stricter one. Neither screen is wrong. They have simply chosen different cut-offs, and both can point to a credible source.

2. They divide by different things

This is the big one, and the one almost nobody explains. The debt ratio is a fraction: interest-bearing debt on top, divided by a company's size on the bottom. The argument is over what goes on the bottom. Some screens use market capitalisation - the price of all the shares. Others use total assets - everything the company owns on its balance sheet.

The two can be far apart. A software company with few physical assets often has a market cap many times its total assets, so a market-cap screen looks kinder to it. An asset-heavy industrial, or any company whose share price has slumped, can be the other way round: its total assets outweigh its market cap, so the same pile of debt looks smaller as a share of assets. A stock can legitimately be "31% of market cap" (fail) and "22% of total assets" (pass) at the very same moment. Two screeners can read the identical debt figure from the identical filing and reach opposite verdicts, purely because of what sits under the line. When a screen says halal and another says no, the denominator is the first place to look.

3. The business-mix line is a judgement call

Every screen also asks whether income from non-compliant activities stays under a small share of revenue - 5% is the usual figure. The trouble is that company filings rarely itemise this cleanly. A conglomerate might earn a sliver from interest, or from a financing arm, or from a product line that one scholar counts and another sets aside. Automated screens estimate it; human screeners sometimes override it. This is exactly why our own tool returns "needs a closer look" on so many names rather than a confident green - the one line that most often separates compliant from doubtful is the hardest to read from raw data, and we would rather say so than pretend.

4. They re-check at different times

A screen that divides by today's market cap moves whenever the share price moves - even if the company's debt is unchanged. (Some methodologies smooth this by averaging market cap over the past two or three years, which is one more reason their answers differ.) When a price falls, the market cap falls, the debt-to-market-cap ratio rises, and a stock that was comfortably inside the limit can cross it. The business did nothing. The denominator shrank.

We saw this with PPG: it cleared our screen on 2 September with debt at 29.9% of market cap - a whisker under the line - and by early October it was back above it at 33.7%. When a stock sits that close to the limit, ordinary price moves are enough to push it either side. In the first week of October alone, several large names - a chemicals group, a mining company, an analytics firm - crossed the line back and forth on different days as prices swung. A screener that only re-runs its numbers once a quarter will show you a verdict that is weeks out of date. One that re-checks daily will disagree with it - and both are "correct" as at their own date.

So what do you actually do about it?

You stop treating a one-word verdict as the whole story and start asking three questions of any screener, including ours:

• Which standard is this? A 30% line and a 33.33% line are both defensible. Pick the one you are comfortable following, then apply it consistently rather than shopping around for the answer you wanted.
• What is it dividing by, and how fresh is it? Market cap or total assets changes everything near the threshold, and a verdict with no date on it is a verdict you cannot trust. A dated, regularly updated record beats a confident label with no timestamp.
• Is this a business problem or a price problem? A stock that fails because its debt genuinely ballooned is a different situation from one that fails only because its price dropped and dragged the ratio up. The screen reads the same; the meaning is not.

This is the whole reason we publish a dated verdict ledger rather than a single yes-or-no badge: so you can see when a verdict changed, and why, and decide for yourself with the standard you have chosen. A screen is a tool for thinking, not a fatwa. Use it as one.

Educational only - not financial advice. Our halal screen is an automated AAOIFI-style estimate, not a religious ruling; confirm any borderline name with a qualified screener or scholar and do your own research before acting.