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In business, a white knight may be a corporation, a private company, or a person that intends to help another firm. There are many types of white knights. Alternatively, a gray knight is an acquiring company that enters a bid for a hostile takeover in addition to the target firm and first bidder, perceived as more favorable than the black knight (unfriendly bidder), but less favorable than the white knight (friendly bidder).

The first type refers to the friendly acquirer of a target firm in a hostile takeover attempt by another firm. The intention of the acquisition is to circumvent the takeover of the object of interest by a third, unfriendly entity, which is perceived to be less favorable. The knight might defeat the undesirable entity by offering a higher and more enticing bid, or strike a favorable deal with the management of the object of acquisition.

In short, if Company T (target) is going to be acquired by Company H (hostile firm), but Company A (acquirer) can acquire ownership of Company T, then Company A would be acting as the white knight.

The second type refers to the acquirer of a struggling firm that may not necessarily be under threat by a hostile firm. The financial standing of the struggling firm could prevent any other entity being interested in an acquisition. The firm may already have huge debts to pay to its creditors, or worse, may already be bankrupt. In such a case, the knight, under huge risk, acquires the firm that is in crisis. After acquisition, the knight then rebuilds the firm, or integrates it into itself.

A white squire is similar to a white knight, except that it only exercises a significant minority stake, as opposed to a majority stake. A white squire doesn't have the intent to take over a company, but rather serves as a figurehead to a defense to a hostile takeover. The white squire may often also get special voting rights for their equity stake. An example of a white squire might be Warren Buffett.

• 1953 - United Paramount Theaters buys nearly bankrupt ABC
• 1982 - Allied Corporation buys Bendix Corporation in a situation involving the "Pac-Man defense". Allied is drafted in when the company that Bendix tries a hostile takeover on fights back by buying up Bendix stock in attempt to create a reverse hostile takeover.
• 1986 - George Soros's Harken Energy buying George W. Bush's Spectrum 7
• 1998 - Compaq merging with financially weak DEC
• 2001 - Dynegy attempts to merge with Enron to cover Enron's massive debts (the merger failed as it became obvious that Enron had been committing fraud, resulting in the Enron scandal.)
• 2003 - SAP was seen by analysts as the most likely to help defeat Oracle's hostile for PeopleSoft, however it came to nothing.
• 2006 - Severstal almost acted as a white knight to Arcelor as the merger negotiations were in place between Arcelor and Mittal Steel
• 2006 - Bayer acted as a white knight to Schering as the merger negotiations were in place between Schering and Merck KGaA
• 2007 - Nissin launching a friendly 37bn yen ($314m; £166m) bid for Myojo Foods after US hedge fund Steel Partners offered 29bn yen to buy the firm.^[1]

1. ^ Cup Noodle white knight ups bid

• Economics
• Takeover
• Microeconomics
• Industrial organization