TSM
Taiwan Semiconductor Manufacturing Company Ltd.
stock NYSE ADR

TSM will fast become a monster play

Google, AVGO, TSM, AMZN, NVIDIA, VRT, ASML, IBIT.

because the adr doesn't let you directly convert your shares to local shares and people buy more $TSM cause its easier

I agree with this.. I'm 43 and already feel like I have too much in my 401k and will easily have ~2.5M by 60 if I stop contributing, so I have refocused efforts by only getting the 401k match and first priority is Roth IRA max and then HSA max but free money goes to taxable account which is more near term growth of my money 3-10 years.
Need to have your core in S&P like VOO or VTI and then allocate a smaller % to buy a few tech stocks that are going to outpace for years to come (NVDA, AMD, GOOG, TSLA, AMZN, TSM), also add some crypto like at least some IBIT.

Going to push back a bit on the "structural megatrend" framing... what looks like diversification is really 100% concentration in 2 themes. SMH is top-heavy in NVDA/TSM/AVGO (those few names drive most of the fund), and URA is similarly concentrated in Cameco/Kazatomprom. So "AI + nuclear" really becomes "if those handful of names keep working".
Hidden risk that hits hard: URA had roughly a 90% drawdown from its 2011 peak to 2020 trough, and took close to 10 years to recover. SMH dropped about 50% in 2022 alone. That's standard thematic-ETF behavior when narratives cool, not a freak event... "high risk tolerance" is honestly hard to test until you've actually sat through one.
My read - I'd anchor with a global core (VT if your broker carries US-domiciled, IWDA if you need UCITS) at 60-70%, and let SMH/URA be a 30-40% thematic tilt. Still captures the bets, but you're not betting 10 years of wealth on 2 narratives.
For a 3rd structural leg, gold (GLDM or PHAU) probably helps you more than another sector ETF given you're in Turkey... your country risk is basically the textbook gold use case.

What do you mean you don't know what to do? Buy more. If you don't think AMD, TSM are good buys anymore, then buy something else. If you feel like your emotions are getting in the way, then automate the process with weekly deposits and auto-buys. Then go back to living your life.

I just read through some of the 10F filings. I ended up selling out of my ASML stake in two tranches in Q1, while Dev Kantesaria cut his V stake in half to move it all to ASML. At these valuations I wonder what he saw to increase that stake?
I love the firm and think it's one of the key bottlenecks in the semi trade. China still hasn't even figured out how to mass produce an EUV machine let alone have it production ready, so there's no competition there.
Problem is that TSM can basically hold off buying bleeding edge High NA at will. Until Intel or Samsung really catch up to them, TSM remain the top dog in logic. Memory demand has absolutely exploded, but how many new fabs will the big three open up before the next bust cycle? I feel a lot of the upside in ASML is priced in, and it'll be hard to make outsized earnings for a bit.
Maybe I'm wrong, but it was hard not to take profit when valuations currently indicate that ASML would need to hit the top of their 2030 revenue guide (or higher) per their investor day to come close to their current price. For context I sold a large tranche at $1,050, and the second trance at $1,460. Most of my buys were at ~$600.

What makes TSM more like BABA than a US stock?

Avgo, TSM

i'd separate price anchoring from allocation. if you still want AMD/TSM exposure, DCA a fixed slice into VTI plus the names you actually understand, but don't go hunting small caps just because they haven't pumped yet.

You’re anchoring too hard to your old buy price. The market doesn’t care that you bought AMD at $20 or TSM at a quarter of today’s price what matters is whether you think the business will outperform from *today’s* valuation onward.
A lot of people make the mistake of refusing to add to winners because “it already went up too much,” then they end up rotating into worse companies just because they look cheaper. Expensive stocks can stay expensive for years if earnings keep compounding.
You also don’t need to go all-in at current prices. If you still believe in the long-term thesis, just keep DCA’ing gradually and accept that future returns probably won’t be as insane as the post-2020 run. That’s normal.
Personally I’d avoid forcing money into random small caps just because mega caps feel psychologically expensive. “Looks cheaper” and “is undervalued” are very different things.

I have exactly this problem. I have AMAT LRCX TSM NVIDIA KLA on ASML AMBIQ AMD . They are all up 100-300% and have made a considerable difference to the growth of my conservative portfolio in the last couple of years but I never added to them and can’t bring myself to now…. The only one I did add to was GOOG . If I’d done the same with the others I’d be laughing

Man I don't think it's a good idea to ask for stock prediction advice from somebody that missed the boat on this one. If you want my take though, I don't think there's anything you'd see right now and think "yeah that's an undervalued play I have to get my hands on". Hardware manufacturing is notoriously hard to scale, and the market has consistently, aggressively trawled upstream of the manufacturing chain to try and engage in supply/demand arbitrage. This is not to say that they won't continue to appreciate in value - they absolutely can - it's just that taking a fresh position now would essentially amount to speculation about the general health of the market and the sustainability of the AI datacenter buildout.
On the photonics front, outside of the components producers such as AXTI and AAOI (for eg), growth that isn't speculative would still lie in the domain of mature companies with appreciable SiPh arms. Something like AVGO, MRVL, TSM, UMC, GFS. It's not going to get you a 10 bagger by any means, but at least you could see them growing into their current valuations.
Based on earnings reports from the semiconductor equipment side though (ASML, AMAT, LRCX, KLAC), the lead times for equipment bookings are increasing despite ramping production, not decreasing, so it's entirely possible this AI extension still has legs. The moment the booking lead times hit an inflection point though, I would liquidate quite a bit. That's my plan, at least.

It’s the same what TSM is doing. incredibly tough. But yeah, ASML needs this just as much as Tata.
Asml has like only 3 or 4 customers. They would want to increase their customer base.

The old cost basis is messing with your head. The market doesnt care where you first bought AMD or TSM. New money needs a new reason at today’s price. If you cant explain why the next dollar still belongs there at this valuation, it goes into VTI until the answer is cleaner. Corrections help only if the business read is still intact, not because the chart got cheaper than last week. Small caps arent the cure for large caps running. They just give you different ways to be wrong. Keep the core boring. If you want single names, cap the weight, build in pieces & judge them against today’s earnings, margins, capex, valuation & risk. Your 2021 entry was not a permanent discount card.

All the tech stocks have been doing really well, bought in around 2021-ish with names like AMD TSM etc as well as the usual VTI. The thing is I didn't put in much capital back then since I was younger and now that I've saved up more capital to deploy to the market I'm not sure what to put my money in other than the VTI anymore. Even if the fundamental is still strong and I believe in the company for the next couple years, paying at over 4 times what I brought in years ago feels kinda crazy.
Just keep DCA'ing/deploy captial during corrections into the ones I believe in? start looking for other smaller market cap stocks that haven't had a run yet? not exactly sure what to do in current markets.

New investor here, in early 30s with moderate risk appetite. I’m considering the following individual stocks that make up a total of 20% of my portfolio. Is this diversified enough and good to go? :)
45% tech/semicon: NVDA, TSM, GOOG (10% each), MSFT, AMZN, NBIS (5% each)
20% memory: MU, SNDK (10% each)
15% space: RKLB, ASTS, PL (5% each)
10% lifestyle: RDDT, NFLX (5% each)
10% regional/others: Sony, Tencent (2% each), remaining 6 penny stocks - HOVR, AMPX, HGRAF, RZLV, DRTS, SLS (1% each)

It’s riskier yes but my individual holdings have outperformed voo. I hold a lot of voo but certain stocks have been both great performers and made it easy to sleep at night. For years AVGO just kept quietly grinding higher. TSM has been that way too. I don’t worry much holding googl, up or down either. It’s a monster. Unless a paradigm shifts, it will be fine. I’ve also owned AZN for a while and it is great too, just a great performer. I personally wouldn’t own individual stocks if wasn’t trying to out perform VOO/. The SP500. Besides those i  have stocks Im less committed to but those are ones that have been solid and steady growers. I also own msft, which seems like dead money for the last three years. Maybe it will wake up. I don’t hold huge percentages 

I hold individually: INTC, AMD, MU, NVDA, TSM. I should look for a good ETF. Any suggestions anyone?

afaik, all the empirical studies to test multi-factor models used equity only US value weighted stock market portfolio as MKT. So academia proved US TSM is efficient (the premise of this debate).
(I have not seen any empirical study that proved what OP proposed is efficient. Please correct me, if wrong)