Depending on the company bylaws you typically need at least a simple majority of the votes / stocks to issue new stocks. The company can also have a rule that says that existing share owners must have the right to purchase before everyone else, to "defend" their stake.
In general companies typically raise money because they think the cash infusion will benefit the existing shareholders in the long run, either by not going into ≈bankruptcy or having the cash to do investments / move into new markets etc.
In general companies typically raise money because they think the cash infusion will benefit the existing shareholders in the long run, either by not going into ≈bankruptcy or having the cash to do investments / move into new markets etc.