Given its stake in the startup, Neuralink technically comprises a part of Alphabet. That said, it's a minuscule stake compared to the overall size of Alphabet's business.
2. Invest in Tesla stock
Getting a stake in Neuralink by investing in Tesla (TSLA -0.84%) stock is an immensely speculative long shot, at best. In 2022, an analyst asked Musk if he would ever consider lumping all of his companies, including Tesla and Neuralink, into one publicly traded entity. Musk said he was unsure and that he saw no reason to combine the companies soon.
It seems incredibly unlikely that Neuralink and Tesla would ever be housed under one parent company. But Musk didn't completely rule it out when directly asked.
3. Just wait for Neuralink stock
As can be seen, investing in Neuralink stock is basically impossible at this stage of the game. But for investors who still want to invest directly in Neuralink, the last option is simply to set money aside now and wait for a future IPO.
Investors who choose this option will need to decide how much money to set aside for a Neuralink IPO. But investors shouldn't set an amount before considering the opportunity cost of waiting for an unknown length of time -- their money would likely earn better returns elsewhere in the market. Considering the IPO could still be years away (or may never come), it's probably best to set aside only a small amount of cash.