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Top Insider Trades 10/1/12: DVA, NATR, SBX, MSCC

|Includes:DaVita HealthCare Partners Inc. (DVA), MSCC, NATR, SBX

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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, October 1, 2012 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
Berkshire Hathaway BO Davita DVA B $28,814,692
Mesdag Willem DIR,BO Natures Sunshine NATR B $4,103,768
Ebrahimi Farhad Fred BO Ml Macadamia Orchards NNUT B $2,347,268
Juneau John B PR,CEO,DIR Contango Oil & Gas MCF B $2,278,844
Pfau Norman E Jr DIR Community Bank Sh CBIN B $325,624
Fort Ashford BO Food Technology VIFL B $207,496
Frost Phillip MD et al CEO,CB,BO Opko Health OPK B $199,017
O Connell Michael BO RCM Technologies RCMT B $116,847
Goodwin Daniel L DIR,BO Inland Real Estate IRC B $99,600
Nelson David C DIR Smithfield Foods SFD B $97,800

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Morfit G Mason DIR Bard C R BCR S $11,574,905
OJSC Third Generation BO Plug Power PLUG JS* $3,576,849
Doerr L John DIR Google GOOG AS $3,037,011
Gergasko Richard J COO Seabright SBX S $1,615,666
Peterson James J PR,CEO,DIR Microsemi MSCC AS $1,611,332
Miller Lloyd I III BO Ditech Networks DITC S $1,410,000
Press Clifford DIR Seabright SBX S $1,237,625
Black J Brandon PR,CEO,DIR Encore Capital ECPG AS $1,132,000
Krausz Steven M DIR Guidewire Software GWRE S $896,143
Masters J Kent CEO,DIR Foster Wheeler Ag FWLT AS $888,368

Source: | Key to Insider Title and Trans Type Codes