Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Tangoe (Nasdaq: TNGO) tanked today by as much as 24% after a recent bearish report was released by Copperfield Research, alleging that the company is a fraud.

So what: The report believes that Tangoe has "significantly misrepresented" its figures and has all the usual signs of accounting "shenanigans" that usually lead to scandals. Copperfield also says it is calling for a probe by the SEC to investigate the company's financials. Just last week the company was the victim of another short attack by

Now what: In both cases, the publishers of the reports disclosed holding short positions, with StreetSweeper closing the majority of its short position almost immediately after releasing its scathing report. Allegations in these types of reports deserve some attention, but I wouldn't rush to any conclusions so quickly. For example, Copperfield had also attacked Ebix last year, and StreetSweeper tackled Universal Display in December, both of which have since recovered those related losses and remain active official Fool recommendations.

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