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1. An illegal practice in which an investor with a long position on a security makes a buy order for that security and immediately cancels it without filling the order. Spoofing tends to increase the price of that security as other investors may then issue their own buy orders, which increases the appearance of demand. The first investor then closes his/her long position by selling the security at the new, higher price. Spoofing is a form of market manipulation. See also: Pump and dump.

2. The act of impersonating a person, usually over the Internet, with the intention of gaining access to another's personal or financial information. It is a means of identity theft.


Some market analysts maintain that the increased volatility in stock markets may be the result of an illegal practice known as spoofing, or phantom bids.

To spoof, traders who own shares of a certain stock place an anonymous buy order for a large number of shares of the stock through an electronic communications network (ECN). Then they cancel, or withdraw, the order seconds later.

As soon as the order is placed, however, the price jumps. That's because investors following the market closely enter their own orders to buy what seems to be a hot stock and drive up the price.

When the price rises, the spoofer sells shares at the higher price, and gets out of the market in that stock. Investors who bought what they thought was a hot stock may be left with a substantial loss if the price quickly drops back to its prespoof price.

Spoofing is a variant of the scam known as pump and dump.

References in periodicals archive ?
There is a possibility for failure if the spoofed attacker replies with random number, though it is very rare.
Hop-count filtering: An effective defense against spoofed DDoS traffic".
Another advantage of SPF is that it rejects spoofed e-mails before they ever enter a corporate network.
When recipients open a digitally signed e-mail, a displayed symbol indicates that the message has not been forged or spoofed.
MIR Khan in the song I Hate You, Like I Love you, spoofed Mithun Chakraborty by shaking a leg in his trademark style and dressing up in Disco Dancer style.
Ranbir spoofed SRK's DDLJ image by taking a leak on mustard field singing Tujhe dekha toh yeh jna Sanam , and mocked barechested, cleanshaven machismo by showing off a hairy chest.
Z spoofed email addresses to suggest that the message was sent by the FBI or CIA and requested that the attachment be opened to verify charges brought against the email recipient.
Once a pharming attack is identified, the AFCC handles the attack similar to a phishing attack - it analyzes the attack, proactively shuts down the spoofed site, conducts forensics, deploys technical counter-measures and reports the results to the bank.
AirMagnet products first protected customers, such as hot spot providers and hotels, from spoofed wireless access points (APs) and similar attacks in 2002, which have recently come to be known as "evil twins.
In fact, each day more than three million spoofed e-mails are identified and blocked by IronMail because they have failed SPF checks, and never make it into end users' inboxes.
com's domain name and perpetrating phishing scams with spoofed Amazon.