Reading Richard Ferri's The ETF Book as a Muslim: A Bond Sleeve in Every Portfolio, Securities Lending in the Plumbing, and a Warning About Screens: A Sharia Analysis for Muslim Investors (2026)

Author: Zaid Alissa, CTO and Halal Finance Researcher | Published: September 2026 | Updated: September 2026

Richard Ferri's The ETF Book (John Wiley and Sons, 2008, ISBN 978-0-470-13063-6) is still the clearest mechanical account of how an exchange traded fund actually works. It explains the creation and redemption process, the six legal structures a product can use, why an index provider's rules matter more than the wrapper, and where the money quietly leaves your pocket. I read the whole of it, 415 pages in the edition I worked from, with one question in mind: how much of it survives contact with the Sharia screen.

The answer is that the mechanics survive almost entirely and the portfolio does not. Ferri wrote for an investor with no prohibition on interest, and it shows in the architecture rather than in any single sentence. Every strategic allocation he recommends holds 20 to 80 percent of the portfolio in diversified fixed income ETFs (p. 312 to 313). Nothing in the book is dishonest about that. It is simply a book written for somebody else, and the useful exercise is to separate the plumbing from the plan. Page numbers throughout are PDF page numbers from the copy I read; the printed page is the PDF page minus 29 for the main text.

Twenty one chapters in four parts, plus two appendices. Part I covers the history and the nuts and bolts. Part II is the part most retail investors skip and the part that matters most: the indexes ETFs follow, how securities are selected and how they are weighted. Part III walks through the categories, from broad equity to commodity and currency products. Part IV is portfolio construction. The foreword is by Don Phillips of Morningstar, who describes Ferri as a fee only investment advisor (p. 14).

The book's thesis is stated early and never abandoned: "It is not the ETF structure that leads to a good or bad return, it is the index strategy that each ETF follows" (p. 19). Ferri's Index Strategy Box classifies every fund by how it selects securities (passive, screened or quantitative) and how it weights them (capitalisation, fundamental or fixed weight), giving nine boxes of which exactly one, passive selection with capitalisation weighting, is a genuine market index (p. 127, p. 134). Everything else is a custom index, which is to say an investment strategy with a benchmark's name on it.

That classification is the single most useful thing in the book for a Muslim investor, because every Sharia compliant equity fund in existence sits in the screened row. Ferri would classify an Islamic index as screened selection with capitalisation weighting, and the whole of his analysis of that box applies to it. If you want the fiqh of the wrapper itself rather than the mechanics, our earlier article on index funds and ETFs covers it.

Authorised participants assemble baskets of stock and exchange them for creation units of 20,000 to 50,000 shares, paying a fee of about 1,000 dollars per unit (p. 63, p. 64). On a 50,000 share unit priced at 50 dollars, the unit is worth 50,000 times 50, which is 2,500,000 dollars, and the fee of 1,000 divided by 2,500,000 is 0.0004, that is 0.04 percent. The in kind exchange is what removes low basis stock from the fund and produces the tax efficiency ETFs are known for (p. 93 to 94).

Inside that process is a line most investors never read. "Those stocks can be loaned to APs during the ETF creation process and that earns the investment firm a small interest fee for the duration of the loan" (p. 62). Ferri restates it for registered investment companies: they "can also participate in securities lending programs. The revenue generated by these activities may help the ETF offset expenses that otherwise could cause the performance of the ETF to lag behind the performance of its index" (p. 78). He names State Street, Vanguard and Barclays Global Investors.

This is not a screening failure at the company level. It is an income stream at the fund level, and it is described in Ferri's own words as an interest fee. Mufti Faraz Adam, in his research paper "Solving the Dynamics of Shariah in ETFs and ETNs" (darulfiqh.com), treats interest bearing securities lending as one of the defects that a compliant fund has to avoid. So the first question to put to any halal ETF is not about its holdings. It is whether the fund lends its portfolio, and the answer belongs in the prospectus, not in the marketing page.

Allah says in Surah Al-Baqarah, verse 279:

فَإِن لَّمْ تَفْعَلُوا فَأْذَنُوا بِحَرْبٍ مِّنَ اللَّهِ وَرَسُولِهِ وَإِن تُبْتُمْ فَلَكُمْ رُءُوسُ أَمْوَالِكُمْ لَا تَظْلِمُونَ وَلَا تُظْلَمُونَ

"And if you do not, then be informed of a war [against you] from Allah and His Messenger. But if you repent, you may have your principal, [thus] you do no wrong, nor are you wronged." (Saheeh International)

Your principal back and nothing added is the boundary. Ferri's fixed income chapters describe, precisely and without embarrassment, an asset class built on crossing it. His bond return model states it as arithmetic: "An expected Treasury bond return equals interest payments, plus the reinvestment of interest, plus or minus unexpected changes in the expected inflation" (p. 317). He puts the bond risk premium at 2 percent over inflation and the corporate default premium at 0.5 to 0.8 percent (p. 318). His recommended fixed income sleeve is 60 percent total bond market, 20 percent investment grade corporate and 20 percent TIPS (p. 314). On a 100,000 pound portfolio held at the 40 percent bond point, that is 100,000 times 0.40, which is 40,000 pounds of bond ETFs, split 40,000 times 0.60 equals 24,000, plus 40,000 times 0.20 equals 8,000, plus 40,000 times 0.20 equals 8,000. The three add back to 40,000.

None of that is fixable by screening. It is riba by contract, in the same way that the bond allocation in Eric Tyson's book was. The Islamic substitute is not a cleaner bond fund but a different contract, which is what AAOIFI Shari'ah Standard No. 17 on Investment Sukuk sets out and what our article on sukuk explains.

Three smaller riba surfaces run through the rest of the book. Exchange traded notes are "direct debt obligations issued by a bank" that "pay no interest and offer no principal protection" (p. 83), and if the issuer fails, "ETN holders get in line at bankruptcy court with the rest of the debt holders" (p. 97). The absence of a coupon does not convert a debt certificate into a share; the holder owns a receivable. Commodity index total return includes "the income from the Treasury bills where the collateral sits" (p. 284), and currency trusts pay "a money market rate of interest" (p. 363). And at the account level, Ferri notes that settlement mismatches mean "most brokers will charge interest for the two-day delay" (p. 58), and that ETFs "can also be purchased on margin by borrowing money from a broker" (p. 89).

Set against that, one structural detail runs the right way. Unit investment trusts must park dividends in "a non-interest-bearing escrow account" until the quarterly payout (p. 77). Ferri treats this as a defect, cash drag on the tracking. For a Muslim it is the one place in the book where the legal structure removes an interest receipt rather than adding one.

AAOIFI Shari'ah Standard No. 31 on Controls on Gharar in Financial Transactions makes the sale of what cannot be adequately known defective. Ferri arrives at a version of the same rule from the investor protection side, and he is blunt about it. "Detailed rules for index creation and maintenance should be published in the public domain" (p. 125). "In general, the more complex the selection methodology, the less disclosure is provided" (p. 139). A fund labelled proprietary means "not enough public information is available to determine" how it picks stocks (p. 139), and of the Intellidex indexes he writes that "Even the authorized participants do not have access to details" (p. 193).

For a Muslim this is not merely a quality concern. If the methodology is secret, the buyer cannot verify the screen, cannot know the impure income proportion and cannot compute purification. The compliance claim becomes something you are asked to take on trust from a party with a commercial interest in your taking it.

The same applies to marketing arithmetic. Ferri asks of back tested performance charts, "Does that hypothetical performance have any relevance? Not to a knowledgeable investor" (p. 152), and gives the Value Line case where the published index and the fund tracking it diverged by 11 percent (p. 155 to 156). The gap between an index and a fund is not gharar in the contractual sense, but a Muslim buying on the strength of a hypothetical line on a chart is buying something whose actual object he has not examined.

Ferri's own conclusions get a Muslim most of the way here without any fiqh at all.

Leveraged and inverse funds "use a variety of derivatives such as futures contracts and index swaps... Often the fund manager will borrow against stock in the fund to finance the derivative transactions", and "the dividend is given up to pay for the leverage and fees, plus some" (p. 248). He counted 174 such funds on the market or in SEC registration from ProShares and Rydex alone, charging 0.95 percent (p. 247), and calls leveraged short ETFs "one of the most esoteric and risky funds in the ETF universe" (p. 248). Borrowed money, a derivative overlay and a surrendered dividend is a combination that fails on riba before it reaches maysir. Mufti Faraz Adam has ruled on this class of product directly in "Are inverse ETFs, stock options and naked options permissible?" (darulfiqh.com).

On commodities, "Commodities truly are a trading vehicle, not a long-term investment vehicle. Timing is everything" (p. 280). He records that USO fell 23.8 percent over a period in which oil itself fell 6.5 percent, a gap of 23.8 minus 6.5, that is 17.3 percentage points, lost to roll yield and fees (p. 280), and that commodity funds average 0.75 percent, the most expensive category in the book (p. 287). Physically backed metal is the exception he allows, and that structure has its own fiqh, which our article on the iShares Physical Gold ETC takes up.

On behaviour he is conservative in a way that reads almost like adab. "Investors can efficiently get their allocation into the investments they want in an hour and then change their allocation in the next hour. That is not something I recommend" (p. 89). "The ease of trading anytime during the day may cause some investors to trade too much" (p. 101). Of quantitative funds: "you are investing mainly on faith... A sense of adventure definitely helps when you put your money down on ETFs that follow complex indexes with very short track records" (p. 152). And of himself: "I personally do not use active strategies in my own portfolio, and my company does not use active strategies in the portfolios we manage for clients" (p. 353).

The book has no Islamic content. I searched the full text for islam, islamic, sharia, shariah, halal, sukuk, muslim, faith based, religion, religious and ethical. Nothing comes back except idioms: faith in banks, a leap of faith, full faith and credit. The nearest the book comes to faith based investing is its treatment of socially responsible indexes and a line in the foreword about investors who want to own "only companies that don't do business in Somalia" (p. 13).

What he does say about screens is worth hearing rather than resenting. Three claims:

"Screening is thus an active investment management decision" (p. 145). True, and a Muslim should concede it. A Sharia screened fund is not the market. It is a subset chosen by a rule, and its tracking, concentration and sector tilt all follow from the rule.

"There is no academic evidence to indicate that screening securities will improve market performance in the long-term after adjusting for portfolio risk" (p. 146). Also true, and irrelevant to the obligation. The screen is a constraint, not a performance strategy. Anybody selling a halal fund on the promise that piety outperforms is selling something the evidence does not support.

Then the passage that makes the case for reading the rulebook yourself: "Investors in socially screened ETFs should be aware of what industries are being screened out of an index. You may not agree with what is being called socially irresponsible... As a retired U.S. Marine Corps officer, I have an objection to the providers of those indexes stating that companies in the business of protecting our families, our freedom, and our way of life are socially unacceptable" (p. 242). Ferri is disclosing his own values and telling you that the index provider has disclosed theirs by implication. That is exactly the question a Muslim should ask of an Islamic index: whose filter is this, what does it remove, and at what threshold. The AAOIFI thresholds, as set out by Mufti Faraz Adam in "Making Sense of the 30% Rule in Islamic Finance" (Amanah Advisors, 14 December 2020), put interest bearing debt at or below 30 percent of market capitalisation, interest bearing deposits and securities at or below 30 percent, and prohibited income at or below 5 percent of total income. A company with a 200 billion dollar market capitalisation therefore passes the debt test at up to 200 times 0.30, which is 60 billion dollars of interest bearing debt. Most index providers use a different divisor. That is the subject of the fund by fund articles that follow this one, and you can run the same test on an individual holding with our stock screener.

On securities lending by a Sharia screened fund there is no settled position. Mufti Faraz Adam's ETF paper treats interest bearing lending as a defect to be avoided. Several Islamic index funds decline to lend at all and say so in their documentation; others are silent, which is not the same as a denial. No AAOIFI standard permits lending shares for a fee against cash collateral reinvested at interest, and no widely cited scholar has published a permission for it. Absence of a ruling is not a ruling either way, and the honest position is that the investor should establish the fund's policy and decide with that in hand.

On the wrapper itself, Mufti Taqi Usmani's "Principles of Shari'ah Governing Islamic Investment Funds" (albalagh.net) permits investment in companies carrying some interest income subject to conditions, chief among them that the proportion attributable to impure income is given away and not retained. The stricter position, held by scholars who read the prohibition as admitting no proportion, is that any interest bearing debt on the balance sheet disqualifies the share. Ferri's book is neutral between these, but the choice determines whether any of the screened funds he would classify are available to you at all. Neither position is a minority curiosity and this article does not pick between them.

Exchange traded notes, on the description Ferri himself gives: senior unsecured debt of a bank, no asset held, credit ranking with other bondholders in a bankruptcy (p. 83, p. 97). Bond ETFs of every kind, including TIPS, mortgage backed and preferred stock funds, on the contract rather than on the screen. Leveraged and inverse funds, which combine borrowing, derivatives and a surrendered dividend (p. 248). Margin purchase of any ETF, halal or otherwise (p. 89). Currency products that pay a money market rate of interest on the trust balance (p. 363). Ferri's own book will tell you which of these applies to a given product; the prospectus will confirm it.

Read Part II before Part III. The index rules decide what you own; the ticker only decides how you buy it.

Take Ferri's checklist and add two rows. His list is structure, index rules and disclosure, expense ratio, replication method and holdings count, tracking error, turnover, concentration caps, liquidity and spread, premium or discount, creation mechanics, tax, track record and portfolio fit. The two rows a Muslim adds are the fund's securities lending policy and the published purification figure, if there is one.

Use his premium and discount formula before you trade. It is (market price minus intraday value) divided by intraday value (p. 57), with the indicative value published every 15 seconds. At a price of 50.10 dollars against an intraday value of 50.00, that is 50.10 minus 50.00, which is 0.10, divided by 50.00, giving 0.002, a premium of 0.2 percent. Our earlier piece on halal ETF liquidity works through spreads on the funds Muslims actually buy.

Mind the small trade. Ferri's arithmetic is that a commission of 8 dollars on a 1,000 dollar purchase is 8 divided by 1,000, which is 0.008, that is 0.8 percent before you own anything (p. 97 to 98). For regular small contributions a no load fund can beat an ETF on cost.

Ignore the asset allocation chapters. Chapters 17 and 18 are built on a bond sleeve. What survives is the discipline of picking an asset class first and a fund second, and the point that costs compound against you. If your equity screen is the constraint, our portfolio design article rebuilds the allocation without the lending sleeve, and if part of your portfolio is in digital assets, the crypto screener applies the same discipline there.

The ETF Book remains worth a Muslim investor's time, on the condition that it is read as a manual for the wrapper rather than as advice about what to hold. Ferri is precise where precision matters, honest about costs, sceptical of complexity, and unusually direct about the fact that screened indexes are somebody's judgement rather than the market. He is also writing a portfolio that puts a fifth to four fifths of a Muslim's capital into instruments that return principal plus a contracted increase. Both of those things are true at once, and reading him well means taking the first and leaving the second.

The one line to carry out of the book is his own: it is the index strategy, not the wrapper, that determines what you own. For a Muslim that sentence has a second meaning. It is the screening rulebook, not the word Islamic on the fund factsheet, that determines whether you own it lawfully.

This article is educational and is not a fatwa. Consult a qualified scholar for a ruling on your own circumstances.

No. A full text search for islam, islamic, sharia, shariah, halal, sukuk and muslim returns nothing relevant across the whole book. The closest analogue is the treatment of socially responsible indexes in Chapters 8 and 13 and the foreword's example of investors excluding companies that do business in a particular country (p. 13). The book was published in 2008, before the current generation of Islamic ETFs.

Yes, and this is the practical answer for most readers. The chapters on structure, index construction, weighting, tracking error, liquidity and trading mechanics are about how a fund works, not about what a portfolio should contain. They apply identically to a Sharia screened fund.

The fund lends shares from its portfolio to another market participant in exchange for a fee, taking collateral in the meantime. Ferri describes it plainly as earning "a small interest fee" (p. 62) and notes that fund companies use the revenue to offset expenses (p. 78). Mufti Faraz Adam identifies it as a defect in his ETF research paper. Because the income accrues at fund level rather than company level, no equity screen catches it, so the policy has to be read from the fund documents.

On the description Ferri gives, no. An ETN is senior unsecured debt of the issuing bank, holds no underlying asset, and leaves the holder ranking with other bondholders if the issuer fails (p. 83, p. 97). Paying no coupon does not change the contract from a debt into an ownership interest.

It argues against selling Sharia screening as a performance strategy. He is reporting the academic evidence on social screens (p. 146), and the finding is about return, not about obligation. A Muslim screens because the contract and the underlying business have to be lawful, and would screen even if the evidence showed a cost.

Ferri defines a market index as passively selected and capitalisation weighted, and anything else as a custom index, which he describes as an investment strategy (p. 112, p. 134). Under that definition every Sharia screened index is a custom index, because a rule removes securities from the universe. That is not a criticism; it means his cautions about disclosure, turnover and concentration apply to Islamic funds too.

Chapter 14 on fixed income, the fixed income portions of Chapters 17 and 18, and the currency material in Chapter 15 for the reasons given above. The leveraged and inverse material in Chapter 13 is worth reading as a warning even though the products are not available to you.