Options backdating is the practice of altering the date a stock option was granted, to a usually earlier (but sometimes later) date at which the underlying stock price was lower.
This is a way of repricing options to make them valuable or more valuable when the option "strike price" (the fixed price at which the owner of the option can purchase stock) is fixed to the stock price at the date the option was granted.
Numerous financial analysts replicated and expanded upon the prior academic research, developing lists of companies whose stock price performance immediately after options grants to senior management (the purported dates of which can be ascertained by inspecting a company's Form 4 filings, generally available online at the SEC's website) was suspicious.
Although many companies have been identified as having problems with backdating, the severity of the problem, and the consequences, fall along a broad spectrum.
At one extreme, where it is clear that top management was guilty of conscious wrongdoing in backdating, attempted to conceal the backdating by falsifying documents, and where the backdating resulted in a substantial overstatement of the company's profitability, SEC enforcement actions and even criminal charges have resulted.
While this conclusion is logical in cases of options backdating in which executives knowingly participated in the criminal actions, options backdating can be a result of normal accounting or corporate policies that are not criminal in nature, and is a legal practice as long as the backdated contract is appropriately reported for tax purposes.
Academic researchers had long been aware of the pattern, exhibited by some companies, of share prices rising dramatically in the days following grants of stock options to senior management.