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Top Insider Trades 2/19/13: DVA, AON, AMZN, VCRA

|Includes:AMZN, AON, DaVita HealthCare Partners Inc. (DVA), VCRA

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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, February 19, 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
Berkshire Hathaway BO Davita Healthcare DVA B $37,713,044
Knight Lester B DIR AON AON B $1,427,450
Walter John R DIR Echo Global ECHO B $942,096
Steelhead Partners BO Endeavour Intl END B $884,270
Penn Arthur H CB,CEO,FO Pennantpark FR Cap PFLT B $582,467
Flug Jeffrey DIR Pennantpark Inv PNNT B $577,193
Frost Phillip MD CEO,CB,BO Opko Health OPK B $387,393
Shkreli Martin CEO,DIR,BO Desert Gateway RTRX JB* $360,000
Simmons Glenn R DIR Kronos Worldwide KRO B $262,393
Srinivasan Sam DIR Inphi IPHI B $157,757
Click to enlarge

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Bezos Jeffrey P CB,CEO,BO Amazon Com AMZN AS $51,449,364
Nada Hany DIR Vocera Comms VCRA AS $10,910,452
Manoogian Richard DIR Masco MAS S $10,073,640
Ryan Vincent J DIR Iron Mountain IRM AS $9,450,369
McAdam John PR,CEO,DIR F5 Networks FFIV AS $8,590,544
Grat Tr W Lauder TT,BO Estee Lauder EL AS $6,348,980
Smith Stephen M CEO,PR,DIR Equinix EQIX AS $5,184,637
Alon Israel Oil BO Alon Usa Energy ALJ S $3,753,185
Valentine H Brian VP Amazon Com AMZN AS $3,000,503
Martin William C BO Resource America REXI S $2,737,000
Click to enlarge

Source: | Key to Insider Title and Trans Type Codes