Robinhood will give you between $3 and $225 in one free stock just for downloading their app and opening a free account.
Stash – Micro-investing
Stash does offer $5 cash for signing up and depositing $5 in your account. You can take the $5 and buy free stocks with it.
You can receive free cash of $5 for signing up and making your first investment. You can take the $5 and buy free stocks with it.
Acorns – More Micro-investing
Webull will give you between $3 and $300 in one free stock just for opening a brokerage account with them.