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Top Insider Trades 7/31/12: WPRT, PNK, INVN, SWI

|Includes:Westport Fuel Systems, Inc. (WPRT)

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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 Tuesday, July 31, 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
1 Douglas Kevin BO Westport Innovations WPRT B $7,695,000
2 Ford Scott T DIR At & T T B $2,058,650
3 Frost Phillip MD et al CEO,CB,BO Opko Health OPK B $429,928
4 Pflueger Russell DIR Quality Systems QSII B $160,600
5 Bristol George H DIR Quality Systems QSII B $160,200
6 Birzer H Kevin DIR Tortoise Energy Ind Fund NDP JB* $112,500
7 Shanks Virginia E VP,SO Pinnacle Entertainment PNK B $102,950
8 Blumont Capital BO Intelgenx Technologies IGXT JB*,B $99,220
9 Stewart Terence P DIR Libbey LBY B $98,755
10 Zucaro Aldo C CB,CEO,DIR Old Republic International ORI B $78,000

Source: | Key to Insider Title and Trans Type Codes

Insider Sales
#: Filer Name Insider Titles Company Name Ticker Trans
Dollar Value
1 Gates William H III DIR Microsoft MSFT AS $147,869,504
2 Green Equity Investors V DIR Whole Foods Market WFM S $123,781,768
3 Yonce Donald BO Solarwinds SWI S $51,186,332
4 Neupaver Albert J PR,CEO,DIR Westinghouse Air Brake WAB S $10,442,939
5 Hussein Ahmed D DIR,BO Quality Systems QSII S $7,606,807
6 Mastercard Foundation BO Mastercard MA S $4,761,968
7 Schmidt Eric E CB,DIR Google GOOG AS $4,490,456
8 Stull Steven T DIR Fleetcor Technologies FLT AS $3,688,960
9 Artiman BO Invensense INVN AS $3,370,904
10 Fradin Roger PR,CEO Honeywell International HON S $3,017,966

Source: | Key to Insider Title and Trans Type Codes

Disclosure: I am long WPRT.

Additional disclosure: Our weekly InsiderInsights Newsletter has been issuing independent research on WPRT since it was entered on the Recommended List way back in February 2010.

Stocks: WPRT