bidder
noun [ C ]
uk/ˈbɪdər/ usa company or person that offers to pay a particular amount of money to buy something:
bidder for sth Nestle has been cited as a potential bidder for these businesses.
a company or organization that offers to do work for a particular price:
bidder for/on sth There have been several bidders on this project.
the highest bidder
the person or company that offers the most money:
Their home will be sold at auction to the highest bidder.
the lowest bidder
the person or company that offers to do a particular piece of work for the least amount of money:
The security contracts are usually awarded to the lowest bidder.