ISIN meaning

How an ISIN is built

1. Two letters: the country code. For a fund it is the domicile, not where it trades or who runs it. Most European ETFs are IE (Ireland) or LU (Luxembourg); US-domiciled ETFs and stocks are US.
2. Nine characters: the national number. For a US security this is its CUSIP, so Apple's ISIN is US + CUSIP 037833100 + a check digit.
3. One check digit. It catches a mistyped character, which is why a copy-paste from the issuer's page beats retyping.

Example: IE00B5BMR087 is the iShares Core S&P 500 UCITS ETF (accumulating): Irish-domiciled, sold in dollars as CSPX on LSE and in euros as SXR8 on Xetra. Same fund, same holdings, two tickers.

ISIN vs ticker

• A ticker belongs to a listing. Each exchange assigns its own, in its own trading currency, and the same letters can mean different things on two exchanges.
• An ISIN belongs to the security. Every listing of the fund shares it, so it is the one code to give a broker or search an issuer's site with.
• Share classes get their own ISIN. An accumulating and a distributing class of the same fund, or a currency-hedged one, track the same index under different ISINs, so check the class before you compare fees or returns.

Which listing to buy, and from which broker, is covered in Find your ETF markets.

From an ISIN to the issuer

The fund's name almost always carries the issuer's brand: "iShares" → BlackRock, "Xtrackers" → DWS, "SPDR" → State Street, and Amundi, Invesco, WisdomTree, VanEck and Vanguard under their own names. Searching the ISIN on a fund database such as justETF gives you the name, issuer, index, fee and listings in one place. The fund's Key Information Document (KID) and factsheet name the manager too.

Finding the full holdings

Fund databases and charting sites usually show only the top ten holdings. The complete list lives on the issuer's own product page, normally as a dated CSV or XLSX download under a "Holdings" or "Portfolio" tab. A few things to know when you open it:

• Search the issuer's site by ISIN: some product URLs use an internal number, not the ISIN.
• Every issuer lays the file out differently, and some prepend disclaimer rows above the table.
• The file is as of a date, usually the previous trading day. Weights drift with prices between files.
• A synthetic (swap-based) ETF's file lists the substitute basket it actually holds; the index exposure comes through a swap, so the index constituents are a separate list.

Example · iShares MSCI Global Semiconductors

The product page below carries the fund's ISIN, its listings and the full holdings download.