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Top Insider Trades 10/22/12: BLK, FIRE, SONS, PBYI

|Includes:BlackRock, Inc. (BLK), FIRE, SONS

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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, October 22, 2012 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
Grosfeld James DIR Blackrock BLK B $57,079,209
Adage Capital Gp BO Puma Biotechnology PBYI JB* $9,760,000
Empire Capital Mgt BO Sonus Networks SONS B $1,077,094
Frost Phillip MD CEO,CB,BO Opko Health OPK B $861,756
SPH Group BO Dgt DGTC B $333,129
Buss Brad W CFO Cypress Semi CY B $193,800
Woolf Michael T DIR United Security Banc UBFO JB* $124,984
Sagard Capital BO Hudson Global HSON B $103,500
Mochizuki Robert M DIR United Security Banc UBFO JB* $90,842
Simmons Harold C CB,DIR,BO Valhi VHI B $67,099
Click to enlarge

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Casati Gianfranco CEO Accenture ACN AS $1,356,809
Roesch Martin F CTO,CEO,DIR Sourcefire FIRE AS $1,346,024
VA Retirement Sys BO Blackrock Kelso Cap BKCC S $1,142,092
Cleary James F Jr PR,CEO,DIR MWI Veterinary Supply MWIV AS $1,115,928
Miller Adam L CEO,DIR,BO Cornerstone Ondemand CSOD AS $989,441
O Brien Brien M O Piper Jaffray PJC S $958,130
Sweet Julie Spellman GC,SEC,CCO Accenture ACN AS $853,746
Christensen ChrisR PR,CEO,DIR Ensign ENSG AS $824,954
Hill Peter J CB,DIR Triangle Petroleum TPLM AS $714,048
Stryker Ronda E DIR Stryker SYK AS $476,120
Click to enlarge

Source: | Key to Insider Title and Trans Type Codes