There are many ETFs that cover particular S&P 500 sectors. These typically have less than 100 stocks each. Two of these are available on Trading 212. IITU (technology), IUHC (heathcare). It would be nice if the others were also available, see this link
However, it would also be interesting to have an ETF of the largest 100 companies by market cap,
AAPL, MSFT, AMZN, FB, GOOGL, GOOG, JNJ, BRK.B, PG, V etc. Top 20 would make an interesting pie.
