Update: Top unusual option activity

By David Russell,

Shutterstock photo

As of today's market close, here are the top 10 names showing unusual option activity on tradeMONSTER's LiveAction data system.

National Semiconductor (NSM): Option volume 3,040 percent above average. An investor bought some 10,000 September 24 calls for $0.85, looking for upside. NSM fell 0.04 percent to $24.54.

Mindray Medical (MR): Option volume 2,646 percent above average. Roughly 4,000 August 25 calls were sold for $1.65 to $1.95, and about 5,900 September 30 calls were bought for $1.05 to $1.45 as an investor sought more time for upside. MR fell 6.25 percent to $23.71.

Assuarant (AIZ): Option volume 1,869 percent above average. An investor rolled 1,875 September 32.50 calls to the September 30 strike at a net cost of $2.10, hoping for upside. AIZ fell 2.49 percent to $31.33.

Affymax (AFFY): Option volume 1,687 percent above average. An investor sold 2,250 October 5 calls for $0.70 and $0.65, calling a top in the drug developer. AFFY fell 10 percent to $4.67.

Market Vectors Russia ETF (RSX): Option volume 1,600 percent above average. Investors sold the September 32 puts for $2.05 and bought the August 29 puts in separate transactions. RSX fell 12 percent to $31.11.

Rounding out the rest of the top 10 are:

  • Janus Capital (JNS): Option volume 1,510 percent above average.
  • Endo Pharmaceuticals (ENDP): Option volume 1,387 percent above average.
  • ProShares Short S&P 500 ETF (SH): Option volume 1,376 percent above average.
  • Savient Pharmaceuticals (SVNT): Option volume 1,278 percent above average.
  • Photronics (PLAB): Option volume 1,089 percent above average.

Unusual Activity

(Chart courtesy of tradeMONSTER)

The views and opinions expressed herein are the views and opinions of the author and do not necessarily reflect those of Nasdaq, Inc.

Copyright © 2010 OptionMonster® Holdings, Inc. All Rights Reserved.

This article appears in: Investing Options
Referenced Stocks: AFFY , AIZ , MR , NSM , RSX

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