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Top Insider Trades 3/27/13: TTPH, PRTS, APA, FB

|Includes: APA, FB, PRTS, Tetraphase Pharmaceuticals (TTPH)

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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 Wednesday, March 27, 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
Srinivasan Mallika DIR AGCO AGCO AB $11,529,373
Skyline Qual Pur Fd BO Tetraphase Pharm TTPH JB* $4,767,084
Cmea Ventures Vi BO Tetraphase Pharm TTPH JB*,B $4,499,999
Excel Medical Fund BO Tetraphase Pharm TTPH JB* $3,472,847
Nia Mehran BO U S Auto Parts PRTS JB* $1,499,999
Ferlic Randolph M DIR Apache APA B $744,782
Khazani Sol DIR U S Auto Parts PRTS JB* $499,999
Rakolta John Jr DIR Agree Realty ADC B $409,422
Russell Dowe M O Brkfield Mort Op Inc BOI B $264,000
Frost Phillip MD CEO,CB,BO Opko Health OPK B $171,604

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Kellogg WK Fdn BO Kellogg K AS $5,433,660
Newman Richard G DIR Aecom Technology ACM AS $4,084,725
Mueller Perry Jr DIR Prosperity Banc PB S $2,373,002
Crosslink Capital O Pandora Media P S $2,215,983
Panattoni Lisa R VP Ross Stores ROST S $2,015,980
Greene Ronald G DIR Denbury Resources DNR S $1,900,000
Rosenfeld Eric DIR Primoris Services PRIM S $1,643,121
Pickett C Taylor CEO,DIR Omega Healthcare OHI S $1,312,910
Ullyot Theodore W VP,GC,SEC Facebook FB AS $1,307,001
Schroepfer Michael CTO Facebook FB AS $1,206,861

Source: | Key to Insider Title and Trans Type Codes