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Top Insider Trades 12/16/13: SGEN, BERK, PGC, IO

|Includes:BERK, IO, PGC, 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 Monday, December 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, 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 $16,145,428
Frost Phillip Md CEO,CB,BO Opko Health OPK B $1,365,592
Marubeni DIR,BO Aircastle AYR B $549,636
Marx Moses DIR,BO Berkshire Bancorp BERK B $438,046
Consi Anthony J DIR Peapack Gladstone PGC JB* $286,909
Lapeyre James DIR Ion Geophysical IO B $226,250
Winemaster Gary S DIR,BO Power Solutions PSIX B $222,486
Brubaker Terry L COO,DIR Gladstone Invest GAIN B $220,869
Sanders William DIR Mid Amer Apt MAA B $192,503
Maritz Philip F DIR Asbury Automotive ABG B $172,095

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Page Lawrence CEO,DIR,BO Google GOOG AS $17,771,586
Bergman Stanley M CB,CEO Henry Schein HSIC S $8,728,495
Hochschild Mining BO Gold Resource GORO JS* $7,848,000
Alon Israel Oil BO Alon Usa Energy ALJ S $6,007,169
Lefkofsky Eric P CEO,DIR,BO Groupon GRPN AS $4,689,264
Bernstein Ralph J DIR Air Methods AIRM S $3,040,834
Edison Vent Fd BO Jth Holding LTAXA JS* $2,789,043
Reichental Abraham CEO,DIR 3d Systems DDD S $2,022,750
Smith Robert E DIR,BO Sinclair Broadcast SBGI S $1,882,669
Klein Charles D DIR Ametek AME S $1,739,500

Source: | Key to Insider Title and Trans Type Codes