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Top Insider Trades 4/15/13: SPRT, ESL, LTD, CLMS

|Includes:CLMS, ESL, LB,, Inc. (SPRT)

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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, April 15, 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
Winship Henry W DIR Esterline Tech ESL B $2,111,500
Calamos John P CB,CEO,BO Calamos Ast Mgt CLMS B $517,771
RGM Capital BO Support Com SPRT B $397,820
Fishman Arnold L DIR Aerovironment AVAV B $319,057
Marxe & Greenhouse BO Magnetek MAG B $115,511
Johnson Edwin D PR,COO Casella Waste CWST B $81,000
Neel Carlton VP Zweig Tot Ret Fd ZTR B $64,800
Neel Carlton VP Zweig Fund ZF B $64,250
George W Whitney VP,FO,BO Royce Focus Tr FUND B $59,622
Rimmer Roy T Jr BO Tel Offshore Tr TELOZ B $59,251

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Apollo Mgt V BO Metals Usa MUSA JS* $407,396,608
Wexner Leslie H CB,CEO,BO LTD Brands LTD S $73,980,000
MSDC Mgt BO Journal Comms JRN S $3,066,432
Hung David PR,CEO,DIR Medivation MDVN AS $2,631,030
Jacobson Mitchell DIR,BO MSC Industrial MSM S $1,151,362
Wicki Andreas DIR Pacira Pharm PCRX AS $1,046,820
Blum Capital BO Career Education CECO S,JS* $965,027
Ristau Ronald W CFO Signet Jewelers SIG S $822,360
Golsby Stephen W PR,CEO,DIR Mead Johnson MJN AS $770,525
Alexander George VP,SO Thermon THR AS $629,400

Source: | Key to Insider Title and Trans Type Codes