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Top Insider Trades 5/14/13: GHDX, WES, GGP, X

|Includes: GGP, Genomic Health, Inc. (GHDX), WES, X

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In a victory for common sense, the trading behavior of company executives, directors, and large shareholders in the stocks of firms they're registered "insiders" at have been proven profitable to monitor by both academic studies and (more importantly) the experience of professional investors.

Below are lists of the top 10 mainly open-market insider purchases and sales filed at the Securities and Exchange Commission Tuesday, May 14, 2013 as ranked by dollar value.

Please note, however, that these are factual lists (with edits to remove some noise), not buy and sell recommendations. Dollar value is only one metric to assess the importance of an insider transaction, and, frankly, often not even the most important metric that determines if an insider transaction is significant.

We should also point out that we are presently in a slow filing time for insiders because many companies still have their trading windows closed to their executives until their June quarter earnings are released.

But at, we find new investment ideas just about every day using these and more intricate insider screens to determine where we should focus our subsequent fundamental and technical analysis. And while stocks don't (or shouldn't) move up or down based on insider activity alone, insiders tend to be good indicators of when real stock-moving events like earnings surprises, corporate actions, and new products may be in the offing.

So use these regular blog posts as the initial research tools they are meant to be, and click the links in the tables to analyze a company's or insider's full insider history. Also feel free to email with any questions on our proprietary insider data, and how it is best analyzed.

Insider Purchases
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Baker Felix DIR,BO Genomic Health GHDX B $8,257,066
Arch Venture Fd BO Receptos RCPT JB* $3,982,790
Venrock Assoc V BO Receptos RCPT JB* $3,717,938
Lilly Ventures Fd BO Receptos RCPT JB* $1,999,998
Crane James R DIR Western Gas WES B $1,529,500
Gerber Murry DIR US Steel X B $1,368,704
Sokol David L BO Middleburg Finl MBRG B $649,080
Getz James F CB,PR,CEO Tristate Capital TSC JB*,B $373,705
Smith G Stacy DIR Independent Bank IBTX B $353,932
Loewenbaum GW DIR Luminex LMNX B $344,487

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Schreiber John DIR General Growth Pr GGP JS* $536,588,288
Goldman Sachs BO Cobalt Intl Energy CIE JS* $401,545,888
Warburg Pincus DIR Webster Financial WBS JS* $196,759,120
Bdt Capital DIR,BO Colfax CFX JS* $170,893,600
Page Lawrence CEO,DIR,BO Google GOOG AS $36,751,212
Wilson Dennis J DIR,BO Lululemon Athletica LULU AS $34,095,872
Murdoch James COO,CB,CEO News NWS S $25,056,640
Mackey John P CEO,DIR Whole Foods WFM S $7,816,852
Carr Robert O CB,CEO,DIR Heartland Pmt Sys HPY S $6,521,880
Taylor Philip MD Invesco IVZ S $4,729,200

Source: | Key to Insider Title and Trans Type Codes