InterDigital Inc (IDCC)

[ELI_R]

Here's my answer to the drop today--and you see it constantly with stocks that have risen in value close to options expiration. If there is a large open intereset in calls (true in the case of IDCC -22.5 and 25's), MM's short the stock to drop the price thus causing a hurt in the option call owners--many of the holders close their call positions which alleviates the open interest so those bets are gone. After this occurs the MM's that are short start buying back the shares which brings the price back. Next week we're back testing 25. They do this for a few days just before expiration each month with stocks that fit the profile above.

Eli