Shareholders are entitled to receive a company's annual reports, sometimes through the mail. Suppose I own less than one share (a fractional share, say, 0.8 shares) of a company. Will I be entitled to receive the company's annual reports? Will I even be considered a shareholder?
Paper copies of annual reports cost the company money to produce and mail out, and it is doubtful that they would mail a copy to everyone that owns less than one share. In fact, companies are no longer required to mail out paper annual reports to anyone.
However, generally all publicly-held companies post electronic copies of their annual report to their corporate website, on their investor relations page.
Yes, even if you own less than a full share, you are a shareholder, as you legally own a portion of the company, and your fractional share has value. However, you generally do not have any voting rights until you own at least one whole share.