How many different industry stocks to buy to be considered diversified portfolio?

Hi guys,

I am mainly investing on US stocks and these are the following industry i am focusing on. If you have any other recommendation, please give me some suggestions.

1) EV
2) AI
3) 3D Printing
4) Biotech
5) Energy

Discussion (1)

What are your thoughts?

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1M45

17 Jan 2021

If diversification is what you looking for . Why not just buy ETF for each industry?

EV = DRIV, IDRV, ARKQ....

AI = BOTZ , IRBO, ARKQ....

3D printing = PRNT, DDD....

Biotech = IBB, Arkg, xbi...

Energy = XLE, ICLN, VDE...

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How many shares per stock should I buy, if I were to diversify with 10 stocks in different sectors for buy and hold investing strategy?

Should I buy many different penny stocks where I can more a fair amount or do I save up to buy 1 growth stock?

1st time investment with capital $10k, with OCBC bluechip investment per month ($500) & considering stocks investment. What's the difference if buy bluechip via OCBC Securities as a stock?

What is the difference investing in S-REITs as a diversified portfolio offered by a Robo-advisor (specifically OCBC's RoboInvest: Singapore Stable REITs) versus a multiple REITs on the stock market?

People always say diversification in stocks buying is important. But should I diversify across countries, industries, or nature of business (startups, big firms)? Any thoughts?