Costco Wholesale Corp. (COST), one of the leading U.S. warehouse club operators, is seeing interesting Call activity ahead of this week's Q1 earnings release.

Tiffany & Co. (TIF) sees an investor roll a Bullish option position from the Jan. 60 Calls out to the Feb. 70 Calls.

Tesoro Corp. (TSO) is seeing Bullish option activity this morning with investors focusing on the Dec. 18 Calls.

Forest Laboratories, Inc. (FRX) is seeing unusual Bullish Call activity this morning with the Dec. 32 and 33 strikes receiving the most attention.

Mylan Inc. (MYL) has already seen nearly triple its average daily option volume with investors focusing on the Dec. 20 and 21 Calls

The Coca-Cola Co. (KO) is seeing early option buying activity with investors scooping up the Jan. 65 Calls.

Yahoo! Inc. (YHOO) is seeing unusual option volume today buoyed by a large opening Bullish Call spread.

eBay, Inc. (EBAY) is seeing early Bearish option activity this morning with investors selling the Jan. 31 thru 33 Calls.

The Williams Co. Inc. (WMB), is seeing unusual option activity this morning with the Jan. 27 Calls in focus.

Fairchild Semiconductor Intl. (FCS) is seeing unusual Put activity this morning following an upgrade from Citigroup.

Cypress Semiconductor Corp. (CY) is seeing Bullish Put activity this morning following a price target upgrade from $15 to $18 at Capstone Investments.

Merck & Co. Inc. (MRK) is seeing interesting option activity this morning ahead of next week's research report to the American Heart Association about its new drug that could help combat heart disease.