EQQQ is available: Invesco Nasdaq 100 (EQQQ) | InvestEngine
Unfortunately it provides income rather than accumulation, which wouldn’t be my preference. But I have shares in it anyway. Perhaps I should switch to CNX1, which is lower TER and accumulates.
Thinking about the three options (EQQQ, CNX1, and IITU), EQQQ and CNX1 seem to both mirror the Nasdaq 100 very closely. I’d recommend CNX1 because of the lower TER and accumulation, although it’s also worth considering liquidity (I don’t personally, because I haven’t worked out how to do it easily). IITU is different, as you’d expect for something that tracks a different index. Nasdaq is 11% Apple, 10.5% Microsoft, 5.7% Amazon, 4.6% Nvidia, 3.9% Meta, roughly 3% each for Broadcom, Alphabet, and Tesla, and 2% Adobe. S&P IT is 25.2% Apple, 19.7% Microsoft, 12% Nvidia, Broadcom 4%, Adobe 3%. So you’re getting much more exposure to Apple, Microsoft, and Nvidia, and less to Amazon, Meta, Alphabet, and Tesla. Now personally, I think diversification is the prudent thing and would therefore choose the Nasdaq index, but if you think Apple, Microsoft and Nvidia are likely to outperform Amazon, Meta, Alphabet and Tesla then S&P IT might make more sense for you.
I’d be careful about looking at the past performance of US indexes and assuming the next 30 years will look like the last 30 years. Emerging Markets are likely to grow as a share of global capital. I’d also be very cautious about overinvesting in tech - you might recall that about a year ago the big tech companies all laid off large portions of their workforce, and people who needed liquidity at that time were left holding the bag. There are good reasons to be sceptical about whether the boom that has lifted those 5-7 Goliaths over the last fifteen years (or more) will hold in a tighter regulatory market, the end of low interest rates, market saturation, innovations that might fail, the threats to American democracy, etc.
For me regional diversification is king. I’m quite exposed to India, Brazil, Mexico, Indonesia, and South Africa. Yes there are disasters that could plausibly affect all of them and the US and Europe and the Developed Asia-Pacific, but the odds of those are lower than a disaster affecting any one country or region.