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Top Insider Trades 10/17/13: EOX, QTS, ICPT, DLB

|Includes:DLB, Emerald Oil, Inc. (EOX), ICPT, QTS

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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 17, 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
Ga Qts Interholdco BO Qts Realty Trust QTS JB* $42,000,000
Edelman & Guill BO Emerald Oil EOX JB* $32,543,324
Manning Christopher DIR Antero Resources AR JB* $1,573,000
Williams Chad L CB,CEO Qts Realty Trust QTS JB* $999,999
Telegraph Hill Part BO Ldr Holding LDRH JB* $750,000
Ptv Sciences II BO Ldr Holding LDRH JB* $750,000
Marubeni DIR,BO Aircastle AYR B $530,061
Smith David E BO Catasys CATS JB* $500,000
Axon Thomas J CB,PR,BO Franklin Credit FCRM JB* $500,000
Miller Lloyd I Iii BO COSI COSI B $112,000

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Valueact DIR Adobe Systems ADBE S $132,060,128
Genextra S P A BO Intercept Pharm ICPT JS* $70,213,440
Page Lawrence CEO,DIR,BO Google GOOG AS $18,549,652
Dolby Dagmar BO Dolby Labs DLB AS,JS* $2,459,310
Kellogg WK Fdn BO Kellogg K AS $2,440,000
Goldberg Evan CTO,CB,DIR Netsuite N AS $2,122,598
Natural Gas Part BO Resolute Energy REN AS $1,557,000
Streeter Bruce A PR,CEO Gulfmark Offshore GLF S $1,301,978
Zook Dennis R VP Costco Wholesale COST S $1,163,700
Wang Feng Ming PR,CEO,DIR Ambarella AMBA AS $987,342

Source: | Key to Insider Title and Trans Type Codes