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There are many different strategies to trade stocks and one of them is to find insider trading of stocks. When corporate insiders trade in their own securities, they must report their trades to the Securities and Exchange Commission (SEC), usually within a few business days of the trade. Insider trading cannot be based on material non-public information. However, many investors believe that corporate insiders may have better insights into the growth of a company and its proceedings.

In this article, I will focus on notable insider buy transactions (market cap greater than $200 million) filed at the Securities and Exchange Commission on September 12, 2012. I have also included the key financial metrics for the first three companies. You can use this list as a potential starting point for your analysis.

Definition of Insider: Corporate insiders are either a company's officers, directors, or any beneficial owners of more than ten percent of a class of the company's equity securities registered under Section 12 of the Securities Exchange Act of 1934.

1. NuStar Energy LP (NS): NuStar Energy engages in the terminalling, storage, and transportation of petroleum products primarily in the United States, Canada, Mexico, the Netherlands, St. Eustatius in the Caribbean, the United Kingdom, and Turkey. NuStar has a market cap of $3.77 billion and is currently trading around $48.95 with a 52-week range of $48.44 to $62.64. The stock has fallen 13.61% year to date.

According to SEC filings on September 12, 2012, NuStar had two insiders (Bates Jesse D and Greehey William E) combined purchase a total of 492,000 shares at a total value of $24,078,247. Out of these, 490,000 Common Units were purchased by Mr. Greehey directly from the underwriter at a price equal to the public offering price. Please refer the footnotes from Form 4 for more information on the ownership. Multiple insider purchases are usually a positive sign. The current stock price is fairly close to its 52-week low. Over the past three months, there have been a total of six insider transactions with four Buy transactions. The key financial metrics for NuStar are given below:

The following chart provides the insider trading summary for a three-month and 12-month period.

2. AP Pharma Inc (APPA.OB): AP Pharma Inc is a specialty pharmaceutical company, engages in developing pharmaceutical products using its proprietary Biochronomer polymer-based drug delivery technology. AP Pharma has a market cap of $28.84 million and is currently trading around $0.72, with a 52-week range of $0.16 to $0.78. The stock has gained 212.61% year to date.

According to SEC filings on September 12, 2012, SPCH LLLP (Beneficial Owner) purchased a total of 38,095,238 shares at a total value of $20,000,000. Over the past three months, there have been a total of two insider transactions and all of them are Buy transactions. The key financial metrics for AP Pharma are given below:

The following chart provides the insider trading summary for a three-month and 12-month period.

3. AGCO Corporation (AGCO): AGCO Corporation manufactures and distributes agricultural equipment and related replacement parts worldwide. AGCO Corporation manufactures and distributes agricultural equipment and related replacement parts worldwide. AGCO Corp has a market cap of $4.36 billion and is currently trading around $44.8, with a 52-week range of $30.11 to $54.00. The stock has gained 4.26% year to date.

According to SEC filings on September 12, 2012, Srinivasan Mallika (Director) purchased a total of 114,079 shares at a total value of $5,063,815, through Rule 10b5-1 trading plan. Please refer the footnotes from Form 4 for more information on the ownership. Over the past three months, there have been a total of three insider transactions and all of them are Buy transactions. The key financial metrics for AGCO Corp are given below:

The following chart provides the insider trading summary for a three-month and 12-month period.

Other notable insider buy transactions (minimum transaction value of $200,000) filed with the SEC on September 12, 2012, are as follows:

4. Hot Topic Inc (HOTT): Hot Topic Inc operates as a mall and Web-based specialty retailer in the United States. It operates Hot Topic and Torrid store concepts. Hot Topic Inc has a market cap of $376.71 million and is currently trading around $8.91 with a 52-week range of $6.44 to $10.73. The stock has gained 34.8% year to date. According to SEC filings on September 12, 2012, Hot Topic Inc had two insiders combine purchased a total of 103,106 shares at a total value of $939,960. Please refer the footnotes from Form 4 for more information on the ownership. Multiple insider purchases are usually a positive sign.

5. Blackrock Build America Bond Trust (BBN): BlackRock Build America Bond Trust is a non-diversified, closed-end management investment company. The Trust's primary investment objective is to seek high current income, with a secondary objective of capital appreciation. The Trust seeks to achieve its investment objectives by investing primarily in a portfolio of taxable municipal securities known as Build America Bonds (BABs). Blackrock Build America Bond Trust has a market cap of $1.33 billion and is currently trading around $23.33 with a 52-week range of $19.41 to $24.17. The stock has gained 9.27% year to date. According to SEC filings on September 12, 2012, Harris Jerrold B (Director) purchased a total of 12,200 shares at a total value of $287,218.

6. Opko Health Inc (OPK): Opko Health Inc is a pharmaceutical and diagnostics company, engages in the discovery, development, and commercialization of novel and proprietary technologies primarily in the United States, Chile, and Mexico. Opko Health has a market cap of $1.30 billion and is currently trading around $4.37 with a 52-week range of $4.00 to $5.85. The stock has fallen 10.82% year to date. According to SEC filings on September 12, 2012, Frost Phillip MD ET AL (CEO & Chairman) purchased a total of 60,000 shares at a total value of $262,938. Please refer the footnotes from Form 4 for more information on the ownership.

7. Southwest Bancorp Inc (OKSB): Southwest Bancorp operates as a bank holding company for the Stillwater National Bank and Trust Company, and Bank of Kansas that provides commercial and consumer banking services in Oklahoma, Texas, and Kansas. Southwest Bancorp has a market cap of $216.67 million and is currently trading around $11.14 with a 52-week range of $3.75 to $11.45. The stock has gained 88.18% year to date. According to SEC filings on September 12, 2012, Southwest Bancorp had two insiders combined purchase a total of 11,594 shares at a total value of $128,230.

8. Thomas Properties Group Inc (TPGI): Thomas Properties Group is a real estate company, owns, acquires, develops, leases, and manages primarily office properties and related parking garages, as well as mixed-use and residential properties in the United States. Thomas Properties Group has a market cap of $350.97 million and is currently trading around $6.02 with a 52-week range of $1.88 to $6.15. The stock has gained 80.78% year to date. According to SEC filings on September 12, 2012, Thomas James A (Chairman, President & CEO) purchased a total of 35,700 shares at a total value of $202,866. Please refer the footnotes from Form 4 for more information on the ownership.

Source: Some of the data is sourced from Google Finance, Nasdaq, Finviz, Fidelity, and SEC.gov.

Source: Insiders Bought These Shares On September 12