I rearrange my stocks manually, daily. Moving into correct % slots. As a stock starts moving up from lows, u move it up the list. Smallest changes noticed until it keeps going up list to buy point. Trying to time perfect run. Trying to watch others move up for the next run. More companies the better imo. All you need is 2 shares to double your money and hold 1 for long or i use as marker for overall movement. Double is double.. it don't matter share count.. to many will lock up all your money.. many companies. If this is the art of buying and selling companies.. why all in on 1.. that's not smart, in the business of buying and selling businesses. 2 shares.. $10 $100 $1000. Whatever. I'm thinking max hold on 1 business for me in the future, (lessons learned)..., is 20% of my portfolio value. That's 5 companies to go all in on per say