Is ISDU halal?

ISDU tracks the MSCI USA Islamic Index, which starts from the broad MSCI USA universe of large- and mid-cap US companies and applies Shariah business-activity and financial-ratio screens, leaving roughly 141 constituents. The result skews heavily toward technology, at just under half the portfolio by sector weight, with energy and healthcare as the next largest sectors, a composition shaped by the exclusion of nearly the entire conventional financial sector. Microsoft is the single largest position by a wide margin, followed by Tesla, Micron Technology, and Advanced Micro Devices. Notably, Tesla and several semiconductor names carry meaningfully larger weights in ISDU than in comparable US-listed halal ETFs like SPUS, a function of differences in how the MSCI Islamic methodology screens and weights financial ratios versus the S&P Shariah methodology SPUS uses. Investors comparing the two should not assume identical screening produces identical portfolios; different index providers draw the line in slightly different places.

MSCI's Islamic Index Series applies a two-part screen consistent with AAOIFI standards but implemented with MSCI's own technical specifications. The business-activity screen excludes companies with material revenue from alcohol, tobacco, pork, conventional banking and insurance, gambling, adult entertainment, and weapons. The financial-ratio screen caps total debt, cash plus interest-bearing securities, and accounts receivable each at 33.33% of the company's total assets, with a tighter 30% threshold applied to new index inclusions, anchoring the leverage test to the balance sheet rather than to a trailing market-capitalization average as some other index providers do. MSCI reviews the index quarterly and rebalances semi-annually, with an independent Shariah board overseeing the methodology. This is a rules-based, transparent process, and MSCI publishes its full Islamic index methodology document publicly, which makes ISDU's screening among the more auditable in the category for investors who want to verify the mechanics themselves rather than take a fund provider's compliance claim on faith.

At 0.30%, ISDU undercuts every US-listed halal ETF in this review by 15 to 35 basis points, a meaningful cost advantage over long holding periods. But cost is not the primary consideration for a US-based investor: ISDU is a UCITS (Undertakings for Collective Investment in Transferable Securities) fund domiciled in Ireland and listed on the London Stock Exchange, structured for European and UK retail distribution. It is dual-listed with a GBP share class trading as ISUS and this USD share class trading as ISDU. US persons face two practical obstacles: most US brokerages do not offer LSE-listed UCITS funds to retail clients, and the IRS treats non-US mutual funds and many UCITS ETFs as passive foreign investment companies, triggering complex and often costly PFIC tax reporting and potentially punitive tax treatment on gains. A US investor who somehow holds ISDU should consult a tax professional before assuming it behaves like a domestic ETF at tax time.

ISDU suits UK-based, European, and other international Muslim investors who want low-cost, broad exposure to Shariah-screened large-cap US equities and who can access London Stock Exchange-listed funds through their local brokerage. It is a strong option on cost and methodology transparency grounds for that audience. It does not suit most US-based investors, who face access and tax obstacles that outweigh the 0.30% expense ratio advantage; SPUS (0.45%) or HLAL (0.50%) are the more practical US-domiciled alternatives with essentially the same underlying economic exposure to Shariah-screened US large caps.

iShares does not publish a consolidated per-share purification figure for ISDU the way some US-listed halal ETF providers do. Because the fund tracks the MSCI USA Islamic Index, which screens out companies with impermissible core business activities but tolerates a small amount of incidental income (commonly interest earned on corporate cash reserves) under the standard tolerance threshold, individual constituent companies still generate a sliver of non-compliant income embedded in their dividends. Investors holding ISDU are generally expected to calculate their own purification obligation, either by using each constituent company's publicly disclosed interest income relative to total revenue, weighted by portfolio composition, or by relying on a third-party Shariah screening service such as Zoya, Musaffa, or Islamicly, several of which offer portfolio-level purification calculators that can import an ETF's holdings and estimate the purification percentage automatically. This is a materially less turnkey experience than SP Funds' quarterly published purification calculator or Wahed's quarterly per-share figure, and it is worth factoring into a decision between ISDU and its more purification-transparent US-listed counterparts, even before weighing the access and tax considerations above.