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Top Insider Trades 3/11/13: DGI, NATR, WPZ, EL

|Includes: DigitalGlobe, Inc. (DGI), EL, NATR, WPZ

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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 Monday, March 11, 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 InsiderInsights.com, 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 support@insiderinsights.com with any questions on our proprietary insider data, and how it is best analyzed.

Insider Purchases
Filer Name Insider Titles Company Name Ticker Trans
Type
Dollar Value
Williams Cos BO Williams Partners WPZ JB* $142,980,000
G F W Energy X DIR,BO Triangle Petroleum TPLM JB* $55,800,000
Qatar Inv Auth BO Tiffany TIF B $12,824,385
Mesdag Willem DIR,BO Natures Sunshine NATR B $5,204,358
Skyler Jay S DIR Dexcom DXCM B $1,085,000
Termeer Henri A DIR Aveo Pharm AVEO B $373,736
Pennant Capital BO Universal Stainless USAP B $326,787
Frost Phillip MD CEO,CB,BO Opko Health OPK B $315,264
Owen David DIR Hyperdynamics HDY B $224,009
Straumins Jennifer PR,COO Calumet Specialty CLMT B $201,578

Source: InsiderInsights.com | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Type
Dollar Value
Feinberg Stephen BO Digitalglobe DGI JS* $141,500,000
Lauder Leonard A CB,DIR,BO Estee Lauder EL S $16,422,800
Mastercard Fdn BO Mastercard MA S $13,187,955
Grat Trust W Lauder TT,BO Estee Lauder EL S $13,146,019
Hicks Thomas O DIR Carpenter Tech CRS S $7,252,928
Tomczyk Fredric J CEO,DIR Td Ameritrade AMTD S $4,119,750
Petterson Lasse COO Chicago Bridge CBI AS $3,663,141
Macquarie Infra DIR Macquarie Infra MIC S $3,341,000
Tfi BO Vitran Corp VTNC S $3,100,000
Koski Christine L DIR,BO Sun Hydraulics SNHY S $2,897,155

Source: InsiderInsights.com | Key to Insider Title and Trans Type Codes