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Top Insider Trades 5/16/13: DXM, SPB, AMTD, GHDX

|Includes:AMTD, Dex Media (DXM), GHDX, SPB

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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, May 16, 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
Paulson & Co BO Dex Media DXM B $5,974,475
Harbinger BO Spectrum Brands SPB B $3,278,093
Baker Felix DIR,BO Genomic Health GHDX B $2,603,787
Loewenbaum GW DIR Luminex LMNX B $723,728
Chatila Ahmad R PR,CEO,DIR Memc Electronic WFR JB*,B $407,075
Jornayvaz Robert CB,DIR,BO Intrepid Potash IPI B $348,761
Fulton Stephen P FO Western Asset Mtg WMC B $204,191
Tworecke Frank DIR Hampshire HAMP B $141,602
Okumoto Richard DIR Lifevantage LFVN B $122,000
Morgan John L CB,CEO,BO Winmark WINA B $121,780
Click to enlarge

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

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Type
Dollar Value
TD Luxembourg BO Td Ameritrade AMTD JS* $325,800,000
TC IV BO SS&C Tech SSNC JS* $240,112,496
Summit Ventures BO Fleetcor Tech FLT JS* $205,950,000
Glenview Capital BO Tenet Healthcare THC JS* $191,000,000
Rowan Marc J MD,DIR,BO Apollo Global Mgt APO JS* $107,874,488
Av Partners VIII BO Homeaway AWAY S $48,517,264
Natural Gas Part BO Resolute Energy REN JS* $43,500,000
Page Lawrence CEO,DIR,BO Google GOOG AS $37,808,836
Smith Robert E DIR,BO Sinclair Broadcast SBGI JS* $22,887,424
General Catalyst BO Demandware DWRE S,JS* $21,562,974
Click to enlarge

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

Stocks: DXM, SPB, AMTD, GHDX