Taken directly from Zardiw's link:
The Anatomy of a Short Attack — Abusive shorting are not random acts of a renegade hedge funds, but rather a coordinated business plan that is carried out by a collusive consortium of hedge funds and prime brokers, with help from their friends at the DTC and major clearinghouses. Potential target companies are identified, analyzed and prioritized. The attack is planned to its most minute detail.
The plan consists of taking a large short position, then crushing the stock price, and, if possible, putting the company into bankruptcy. Bankrupting the company is a short homerun because they never have to buy real shares to cover and they don't pay taxes on the ill-gotten gain.
When it is time to drive the stock price down, a blitzkrieg is unleashed against the company by a cabal of short hedge funds and prime brokers. The playbook is very similar from attack to attack, and the participating prime brokers and lead shorts are fairly consistent as well.
Typical tactics include the following:
Flooding the offer side of the board — Ultimately the price of a stock is found at the balance point where supply (offer) and demand (bid) for the shares find equilibrium. This equation happens every day for every stock traded. On days when more people want to buy than want to sell, the price goes up, and, conversely, when shares offered for sale exceed the demand, the price goes down.
The shorts manipulate the laws of supply and demand by flooding the offer side with counterfeit shares. They will do what has been called a short down ladder. It works as follows: Short A will sell a counterfeit share at $10. Short B will purchase that counterfeit share covering a previously open position. Short B will then offer a short (counterfeit) share at $9. Short A will hit that offer, or short B will come down and hit Short A's $9 bid. Short A buys the share for $9, covering his open $10 short and booking a $1 profit.
By repeating this process the shorts can put the stock price in a downward spiral. If there happens to be significant long buying, then the shorts draw from their reserve of “strategic fails-to-deliver” and flood the market with an avalanche of counterfeit shares that overwhelm the buy side demand. Attack days routinely see eighty percent or more of the shares offered for sale as counterfeit. Company news days are frequently attack days since the news will “mask” the extraordinary high volume. It doesn't matter whether it is good news or bad news.
Flooding the market with shares requires foot soldiers to swamp the market with counterfeit shares. An off-shore hedge fund devised a remarkably effective incentive program to motivate the traders at certain broker dealers. Each trader was given a debit card to a bank account that only he could access. The trader's performance was tallied, and, based upon the number of shares moved and the other “success” parameters, the hedge fund would wire money into the bank account daily. At the end of each day, the traders went to an ATM and drew out their bribe. Instant gratification.
