Iran has the only stock exchange in the world where Shariah compliance is not just an overlay but the actual legal framework of the market. Every single listed company on the Tehran Stock Exchange (TSE) is required to operate within Iranian Islamic law, because Iranian commercial and banking law is itself built around Shariah principles. There is no conventional interest-based banking in Iran at the regulatory level. All banks operate under Islamic contracts like Murabaha, Mudarabah, Musharakah, and Qard Hasan. All corporate financing structures are designed to avoid riba.

That makes the TSE unique. Every other exchange in this series has been a conventional market with a Shariah-compliant subset. Tehran is the opposite: a fully Shariah-native exchange where the question is not whether individual stocks pass screens but rather whether the Iranian legal framework matches your understanding of Shariah.

The practical problem is sanctions. US and European sanctions on Iran make it effectively impossible for most international investors to buy Iranian stocks. That is why the TSE almost never appears in any discussion of halal investing despite being the single largest Shariah-structured equity market in the world.

Let me walk through what the TSE actually is and why it matters, even if you cannot directly invest in it.

The scale of the exchange

The Tehran Stock Exchange was founded in 1967 and operated in various forms through the 1979 revolution and the subsequent decades. Total market cap sits around 14,500 trillion rials, which depending on the exchange rate used (and Iran has multiple exchange rates) is roughly between 180 and 350 billion US dollars as of early April 2026. The exchange lists around 670 companies across roughly 40 sectors.

That market cap would make the TSE larger than Qatar, Kuwait, UAE, and Pakistan, and roughly comparable in size to Saudi Arabia's Tadawul before the Aramco IPO in 2019. In other words, Iran has built one of the biggest equity markets in the Middle East despite being cut off from Western capital for most of the past 45 years.

Trading volume is typically high relative to market cap because domestic Iranian investors use the exchange as a hedge against rial depreciation. Inflation in Iran has run in double digits for most of the past decade, and at times has exceeded 40 percent annually. Investors buy stocks as a store of value because real estate and dollars are harder to access.

The legal and Shariah framework

Iranian banking law, formalized in the Law for Usury-Free Banking of 1983, requires all banks to operate under Islamic contracts. The country has 28 commercial banks and several specialized banks, all of which structure their deposits and lending as profit-sharing or cost-plus arrangements rather than interest-bearing transactions.

Iranian accounting standards require companies to report based on Islamic compliance principles. Sukuk issuance is standard practice for government and corporate financing. The Tehran Stock Exchange itself operates under regulations that require companies to meet Shariah standards.

That said, Iranian Shariah interpretation differs from AAOIFI in some respects. The Shia juristic tradition (Iran is overwhelmingly Shia) has its own scholarly framework that differs in detail from the Sunni-majority AAOIFI standards used across the Gulf. For example, some Shia scholars accept certain forms of contingent transactions that Sunni scholars have historically rejected. There are also differences in how Zakat is calculated and distributed.

For a strict AAOIFI-adherent investor, an Iranian stock might not automatically qualify as halal just because it trades on the TSE. You would still want to apply the AAOIFI screens on debt ratios, cash holdings, and non-compliant income to be sure. In practice, most Iranian listed companies would pass AAOIFI screens easily because the legal environment does not permit the kinds of conventional use and financial structures that cause problems elsewhere.

The major listed companies

The largest stocks on the TSE include:

Mobarakeh Steel Company is the largest steel producer in the Middle East and one of the top 20 steel companies in the world by production volume. Iran is a major global steel producer because of abundant iron ore reserves and cheap energy.

Iran National Copper Industries is a large copper mining and refining operation.

Isfahan Oil Refining Company is one of several listed oil refineries.

Tehran Oil Refining Company is another major refiner.

Persian Gulf Petrochemical Industries Company is a petrochemicals holding company with stakes in multiple operating subsidiaries. Iran has one of the largest petrochemicals industries in the Middle East.

Bank Mellat, Bank Melli, Bank Saderat, and Bank Tejarat are the major state-owned banks, all of which operate under Islamic banking principles.

Parsian Bank is a private bank and one of the more liquid listings.

Telecommunication Company of Iran is the incumbent telecom operator.

MCI, Mobile Communication Company of Iran, is the largest mobile operator.

Saipa Automotive and Iran Khodro are the two major state-linked automakers, producing Peugeot, Renault, and Kia models under license historically.

Golgohar Mining is an iron ore producer.

Chadormalu Mining is another iron ore miner.

The point of listing these is not to recommend them (most are inaccessible to foreign investors anyway) but to show that the TSE has a real industrial and commercial base. It is not a pure paper market.

Why sanctions matter

US sanctions on Iran have been in place in various forms since 1979 and were significantly tightened in 2018 when the Trump administration withdrew from the Joint Comprehensive Plan of Action nuclear deal. European sanctions are also in place. Most international banks, including those in the Gulf, will not process transactions connected to the Iranian financial system because of secondary sanctions risk.

This means:

US persons and entities cannot legally invest in Iranian stocks
European persons face severe restrictions
Gulf investors have limited indirect channels
Major international brokers do not offer TSE market access
Iran is excluded from every major global emerging market ETF and index

The practical outcome is that the TSE is a domestic-only market for Iranian residents and a handful of investors who can access it through specific legal structures in countries without sanctions alignment, like Oman or Turkey.

The theoretical halal case for Iranian stocks

If sanctions did not exist, a case could be made that the TSE is the most genuinely Shariah-compliant stock market in the world. Every listing operates under Islamic legal structures at the regulatory level. There is no conventional banking. There is no conventional insurance. There are no alcohol, pork, or gambling industries to worry about.

Some halal indexes and academics include Iran in theoretical discussions of the global Shariah universe for exactly this reason. The Iran Shariah Equity Index, maintained by domestic Iranian index providers, is arguably the cleanest index in existence from a strict Shariah principles perspective.

But theory and practice diverge here. The sanctions regime is firm, the political risk is severe, the currency risk is extreme given the rial's volatility, and the corporate governance standards fall short of what most international investors expect.

Bottom line

The Tehran Stock Exchange is a fascinating case study for anyone interested in Islamic finance. It represents the only fully Shariah-native equity market in the world, with roughly 670 listings structured under Islamic legal principles. The major listed companies span steel, mining, petrochemicals, banking, telecommunications, automotive, and consumer sectors. Theoretical halal investors would find a deep and genuinely compliant universe to work with.

In practice, sanctions, political risk, and currency volatility make the TSE effectively off-limits for international investors. US persons cannot legally invest. Major brokers do not offer access. ETFs and index funds exclude Iran entirely. If and when the sanctions environment changes, the TSE could become one of the most interesting emerging markets for halal investors. Until then, it serves primarily as a reference point that illustrates what a fully Shariah-structured equity market looks like when the legal framework itself is built around Islamic principles rather than being overlaid on a conventional market.

For practical halal portfolio construction, stick to the markets we have covered earlier in this series: Tadawul, DFM, ADX, Bursa Malaysia, the Indian exchanges, Pakistan's PSX, and the Gulf bourses that are actually accessible. The TSE remains the outlier. Worth knowing about. Not currently investable.

Tehran Stock Exchange: Sanctioned but Shariah-Native