BIST 100 for Foreign Investors: What the Index Does and Does Not Say
The BIST 100 is Borsa Istanbul’s benchmark index and the reference point for Turkish equity funds. It is also an index whose lira chart and dollar chart can tell opposite stories over the same period, which is the first thing a foreign reader needs to internalise.
Two charts, one index
Measured in lira, the BIST 100 has produced large nominal gains across periods when, measured in dollars, it went sideways or down. Neither chart is wrong. They answer different questions:
- The lira chart answers what a domestic investor’s holding did in the currency they spend.
- The dollar chart answers what a foreign investor’s holding did in the currency they spend.
Add inflation and there is a third question again: whether the domestic investor gained purchasing power at home. Any commentary citing “BIST 100 returns” without saying which of the three it means should be read carefully.
Where the funds fit
TEFAS carries roughly 190 funds in the equity family: 175 equity funds, 10 equity-intensive funds, 4 index funds and one foreign equity fund.
Only the index funds set out to track a benchmark. The rest are actively managed and may concentrate in sectors or themes, so their correlation with the BIST 100 varies. Equity-intensive funds must hold at least 80% in shares, which puts them in the highest risk bands, but a high equity weight is not the same as index tracking.
Index funds are usually the cheapest way into broad exposure precisely because they are not trying to beat anything — worth checking the fee alongside the return when comparing them with active peers.
Reading a Turkish equity fund page
The benchmark block on each fund page carries a BIST 100 row alongside CPI, gold, USD and EUR. Two comparisons do most of the work:
- Fund versus BIST 100. Did active management add anything over the index?
- Fund versus USD. Did the return survive translation into hard currency?
A fund can beat the index and still have lost money for a dollar-based holder. Both facts are true at once and neither cancels the other.
What the index does not capture
- Concentration. Index weights in a market this size mean a handful of large constituents drive a lot of the movement.
- Dividends, depending on which version of the index is quoted — price and total return series differ.
- Liquidity in stress. Index levels do not tell you how easily positions could be exited during a disorderly period.
For readers who cannot buy locally
Most non-residents cannot access TEFAS without a Turkish tax number and a local account — see can foreigners invest in Turkish mutual funds. The usual alternatives are Turkey-focused ETFs or depositary receipts listed elsewhere, which are different products with their own costs and tax treatment.
What TEFAS data offers regardless is a view of what domestic investors actually hold and earn — a useful cross-check on any externally listed Turkey product. Start with the equity funds.