Is Merck Stock Halal?
Merck & Co., Inc. · MRK · NYSE
Merck & Co., Inc. (MRK) passes our AAOIFI-based screen. Its core business is permissible, and (data as of 2026-03-31) interest-bearing debt is 16.7% of market cap and cash plus interest-bearing securities 1.9% — both inside the 30% AAOIFI thresholds. Ratios move with the share price, so check the data-as-of date; any incidental interest income should be purified.
Financial data as of 2026-03-31 · Screening basis: AAOIFI · Last reviewed 2026-06-15
Our Analysis
Merck & Co. is one of the world's largest research-based pharmaceutical companies, anchored by its blockbuster cancer immunotherapy Keytruda along with vaccines and a sizeable animal-health business. Developing and selling prescription medicines and vaccines is a permissible healthcare activity, with no alcohol, gambling, tobacco, or conventional-finance exposure — so Zoya, Musaffa, and HalalScreener all classify MRK as halal.
The financial ratios are solid: HalalScreener shows debt-to-market-cap at 15.7% and prohibited income at just 0.70% of revenue, both well inside AAOIFI limits, earning a B+ (79/100) compliance grade. A small amount of interest income means routine dividend purification applies, but it is minor.
The practical takeaway: MRK passes both screens with a comfortable margin. Some investors apply an ethical-conscience filter to specific pharmaceutical product lines, but that is a personal preference beyond the standard Shariah screen, which MRK clears. Re-check the ratios after new filings and avoid leverage.
Business Activity Screen
Merck & Co. (known as MSD outside the U.S. and Canada) is a research-driven pharmaceutical company. Its largest products include the oncology drug Keytruda, vaccines, and animal-health products. Revenue is from developing, manufacturing, and selling prescription medicines and vaccines — a permissible healthcare activity.
No alcohol, gambling, tobacco, or conventional-finance revenue is disclosed. HalalScreener reports non-compliant (prohibited) income at 0.70% of revenue and debt-to-market-cap at 15.7% — both well under AAOIFI thresholds. Modest dividend purification applies for the small interest-income share.
Financial Ratio Screen
| Screen | Value | AAOIFI limit | Result |
|---|---|---|---|
| Interest-bearing debt / market cap | 16.7% | < 30% | Pass |
| Cash + interest-bearing securities / market cap | 1.9% | < 30% | Pass |
| Impermissible income / total revenueInterest income $343.0M on $64.93B total revenue (Merck & Co., Inc. FY2025 (fiscal year ended 2025-12-31, Form 10-K)) = 0.5% — under AAOIFI's 5% limit. | 0.5% | < 5% | Pass |
Spot market cap at research date (consider trailing average for borderline names). Data as of 2026-03-31 · thresholds per AAOIFI Shariah standards.
This verdict uses the AAOIFI standard — the most widely used and, at a 30% debt limit, the most conservative mainstream Shariah standard. Interest-bearing debt and interest-bearing securities each stay under 30% of market cap, and impermissible income under 5% of revenue. Other standards (Dow Jones Islamic, S&P Shariah, MSCI Islamic, FTSE Yasaar) use ~33% limits or screen against total assets, so a borderline company can be rated differently by each. How we screen & why screeners disagree →
How Merck screens across Shariah standards
The standards disagree on this company. It passes some Shariah screens and fails others — which is exactly why you may see a different answer in different apps. Our headline verdict uses AAOIFI, the strictest and most widely cited mainstream standard.
| Standard | Debt | Cash & interest securities | Limit / basis | Result |
|---|---|---|---|---|
| AAOIFI (our standard) | 16.7% | 1.9% | < 30% of market cap | Pass |
| Dow Jones Islamic / S&P Shariah thresholdDow Jones and S&P apply this limit against a trailing 24–36-month average market cap; shown here on the same point-in-time market cap for comparison. | 16.7% | 1.9% | < 33% of market cap | Pass |
| MSCI Islamic / FTSE Yasaar basisTotal-assets denominator. MSCI/FTSE also apply entry/exit buffers and a receivables screen we do not reproduce. | 38.2% | 4.4% | < 33.33% of total assets | Fail |
HalalWallet computation reproducing each standard's threshold and denominator from public filings (balance sheet as of 2026-03-31) — not the providers' licensed index determinations, which can differ. Debt is interest-bearing borrowings (operating leases excluded). The impermissible-income screen (< 5% of revenue) is common to all of these standards and is shown in the ratio table above. Dow Jones and S&P apply their limit against a trailing 24–36-month average market cap; MSCI and FTSE add entry/exit buffers and a receivables screen. Full methodology →
Other stocks where Shariah screeners disagree
These companies pass under some mainstream standards and fail under others — the same pattern as this verdict. That is why two apps can show different answers.
AbbVieABBV
Passes market-cap screens · fails MSCI/FTSE (total assets)
AirbnbABNB
Passes market-cap screens · fails MSCI/FTSE (total assets)
Arista NetworksANET
Passes market-cap screens · fails MSCI/FTSE (total assets)
ArmARM
Passes market-cap screens · fails MSCI/FTSE (total assets)
BlockXYZ
Fails AAOIFI market-cap · passes MSCI/FTSE (total assets)
BroadcomAVGO
Passes market-cap screens · fails MSCI/FTSE (total assets)
Scholars' & Screeners' Positions
Published positions, cited as stated. Screeners can reach different conclusions on the same company because of ratio timing and methodology differences — we report the disagreement rather than flatten it.
Zoya
Classifies MRK as Shariah-compliant under its AAOIFI-based methodology.
Source →Musaffa
Classified HALAL as of February 2026 based on AAOIFI screens (report source: 2025 Annual Report).
Source →HalalScreener
Rates MRK Halal (B+, score 79/100): debt-to-market-cap 15.7%, interest-bearing deposits 4.9%, prohibited income 0.70% — all under AAOIFI limits.
Source →
Purification
Even Shariah-compliant companies typically earn a small amount of incidental interest on corporate cash. The standard practice is to purify: donate the proportion of your dividends (and, per some scholars, capital gains) attributable to impermissible income. Our purification calculator automates the math from your holding and the company's disclosed figures.
Purification calculatorKeep your portfolio halal
A pass today isn't a pass forever — ratios drift across thresholds between filings. A halal screener monitors holdings continuously.
Related guides
Consider Consulting an Islamic Scholar
Major whether Merck & Co., Inc. is halal decisions often involve nuances that vary by scholarly opinion and personal circumstance. While HalalWallet provides educational comparisons and tools, we are not scholars or financial advisors. For personal guidance on Shariah compliance, consider speaking with a qualified Islamic scholar, your local imam, or a Shariah-certified financial advisor familiar with your situation.
Important: HalalWallet is an educational comparison platform. We do not provide financial, legal, or religious advice.
Product structures and Shariah-compliance oversight vary by provider. Before applying:
- Verify halal compliance directly with the provider.
- Review the contract structure (Murabaha, Ijara, Musharakah, etc.) and any disclosed Shariah board opinions.
- Consult a qualified Islamic finance advisor or scholar for guidance on your individual circumstances.
Frequently Asked Questions
Sources and review process
This page is reviewed against HalalWallet editorial standards and source documentation.
Reviewed by: HalalWallet Editorial Team
Last reviewed: 2026-06-01
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Editorial Team, HalalWallet
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