With my luck , All I have to do now is to buy calls and tesla gonna drop 30 % in the next week and stay down for years no matter the split.
A stock split reduces the cost to buy a single share, but not the valuation assigned by the market, so it only becomes optically cheaper. A key reason for such moves is to lower the entry point for private stockholders, as the nominal price is no barrier for professional money managers. - Stock splits convey mgmt confidence about the future. - Splits are announced by companies with strong fundamentals that are likely to continue. - Splits make it easier for retail investors to own shares. This is the answer to the question why it affects the rise of price.
Even with fractional shares, people (poor investors) still prefer to buy shares whole. And it can make tax-time a bit simpler I suppose. That said, splitting the shares allows more contract equity to come in because those priced out of the higher-stakes derivatives can now bite a little without having to play at nose-bleed risk. Yes, I know someone is going to point out that the poor-man can just do spreads to get around that, but spreads are not risk-free and have their own risks, particular with equities like Tesla, which has many already existing examples of spread disasters gone wrong...