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Top Insider Trades 12/5/13: SGEN, RST, ACCL, DLTR

|Includes: ACCL, DLTR, RST, Seattle Genetics, Inc. (SGEN)

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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, December 5, 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
Baker Felix DIR,BO Seattle Genetics SGEN B $43,442,732
RGM Capital BO Accelrys ACCL B $1,349,377
Blue Harbour BO Caci Intl CACI B $1,232,779
Marubeni DIR,BO Aircastle AYR B $1,097,715
Coxe Tench DIR,BO Mattersight MATR JB* $1,077,371
Bvf Partners LP BO Chemocentryx CCXI B $951,154
Fair William E DIR Independent Bank IBTX B $350,336
Tannenbaum L M CEO,DIR Fifth St Sr FR FSFR B $203,837
Mulroy Robert J CEO,DIR Merrimack Pharm MACK B $146,226
Hall Conrad M DIR Dollar Tree DLTR B $110,600

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Hoag Jay C DIR Zillow Z S $36,338,100
Levine Jeremy S DIR YELP YELP S $20,677,160
Witt Laura DIR Rosetta Stone RST JS* $17,007,738
Bhusri Aneel CEO,CB,BO Workday WDAY AS $4,934,753
Davidar David D VP,OO,DIR Globus Medical GMED AS $1,443,750
Branson Kenneth DIR Guidewire Software GWRE AS $1,143,965
Kluge Robert H PR Varian Medical VAR AS $1,034,560
Toma Ihab M VP Transocean RIG S $1,001,334
Hayes John A CB,PR,DIR Ball BLL S $989,418
Nelson Zachary CEO,DIR Netsuite N AS $926,066

Source: | Key to Insider Title and Trans Type Codes