It's better to buy stocks before splits as just after split, stocks price reduces in split ratio, then more buyers buy the stocks resulting in increased stocks price.
Stock split is a corporate action and does not really matter either you buy before or after the split. Due to higher availability of floating stock the prices tend to come down slightly after the bonus / stock split.
A stock split changes nothing about the fundamentals of a business. Yes, you should invest in a business when they are doing a stock split, because they have momentum and the stock price is increasing.
When the stock splits there are more investors that can afford to purchase the stock. Historically, stocks have a bump after they split.
Companies also want to lock in their gains. When a stock splits it lowers the price of the stock. This lowers the perceived volatility, it wont move as high or as low as it would prior to the split.
You should not invest because a company does a split. You should invest based on your investment criteria.
Criteria:
Is a company growing revenue?
Are they selling more products/services?
Is the industry growing?
What vision does management have for the business?
Who are the business competitors?
There is no substitute for the financial statements. Is the business moving in the right direction.
Invest when you are totally confident in the business and be a long term investor.
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