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Top Insider Trades 10/5/12: WPP, TSLA, DG, TXI

|Includes: DG, TSLA, TXI, Wausau Paper Corp. (WPP-OLD)

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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 Friday, October 5, 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
Starboard Value BO Wausau Paper WPP B $2,182,479
Musk Elon CEO,DIR,BO Tesla Motors TSLA JB* $999,994
Lane Thomas K DIR Summit Midstream SMLP JB* $800,000
Lanigan Bernard Jr DIR Texas Industries TXI B $414,425
Frost Phillip MD et al CEO,CB,BO Opko Health OPK B $342,486
Giertz James R VP,CFO Fuller H B FUL B $90,052
Shaw Seth M CEO,DIR Immunovative NVNC JB* $35,648
Dahl James H BO Pope Resources POPE B $29,493
Stilwell Joseph DIR,BO Kingsway Financial KFS B $26,463
Lupp David B CFO,COO Mod Pac MPAC JB* $20,000

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
Buck Holdings BO Dollar General DG JS* $1,801,874,560
Fir Tree BO Rlj Acquisition RLJA JS* $18,531,876
Scopia Fund Mgt BO PHH PHH S $15,376,859
Diromualdo Robert F DIR Ulta Salon Cosmetics ULTA S $6,546,207
Cole John P Jr DIR Liberty Global LBTYA JS* $4,257,847
Hung David PR,CEO,DIR Medivation MDVN AS $2,895,780
Credit Suisse Ag BO Walker & Dunlop WD AS $1,705,979
Sherif Tarek CB,CEO,DIR Medidata Solutions MDSO AS $1,578,856
Lithia Holding Co BO Lithia Motors LAD AS $1,502,799
De Vries Glen Michael PR,DIR Medidata Solutions MDSO AS $1,097,869

Source: | Key to Insider Title and Trans Type Codes