shareholder

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun One that owns a share or shares of a company or investment fund.

from The Century Dictionary.

• noun One who holds or owns a share or shares in a joint-stock or incorporated company, in a common fund, or in some property: as, a shareholder in a railway, a mining or banking company, etc.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who holds or owns a share or shares in a joint fund or property.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One who owns shares of stock.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun someone who holds shares of stock in a corporation