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Top Insider Trades 10/31/13: AGCO, ZIOP, MRTX, GSPE

|Includes:AGCO Corporation (AGCO), GSPE, MRTX, ZIOP

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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 Thursday, October 31, 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
Srinivasan Mallika DIR AGCO AGCO AB $19,795,180
Kirk Randal J DIR,BO Ziopharm Oncology ZIOP JB* $10,000,000
Orbimed Advisors BO Mirati Therapeutics MRTX JB* $2,187,500
Ghasemi Seifi DIR Air Products APD B $1,621,332
Askew James M DIR,BO Gulfslope Energy GSPE JB* $600,000
Kain Gary D PR,CIO American Capital AGNC B $541,500
Kkr Asset Mgt BO Amedisys AMED B $472,010
Marubeni DIR,BO Aircastle AYR B $350,615
Priest Jeffrey W PR,CEO Gen Amer Inv GAM B $302,282
Frija Kevin CEO,DIR Vapor VPCOR JB* $210,000

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Gates William DIR Microsoft MSFT AS $110,374,536
Arora Nikesh VP Google GOOG AS $26,849,374
Plank Kevin A CEO,CB,BO Under Armour UA AS $23,684,197
Gibeau Frank D PR Electronic Arts EA S $5,694,099
Lasry Marc BO Yrc Worldwide YRCW S $5,241,365
Silver Star Dev BO Synnex SNX S $3,307,163
Stryker Ronda E DIR Stryker SYK AS $1,552,134
Lyons Mark D VP,CFO,TR Arch Capital ACGL S $1,503,057
Bilban Frank J VP,CFO Encore Wire WIRE S $1,496,209
Dolby Dagmar BO Dolby Labs DLB AS $1,445,824

Source: | Key to Insider Title and Trans Type Codes