Since the beginning of the week, the tech sector was witness to several important insider purchases. So, in this article I will take a look at three big –and interesting- insider purchases within this segment.

First off is National Instruments Corp (NASDAQ:NATI), a $3.47 billion market cap designer, manufacturer and marketer of computer-based instrumentation software and hardware products for scientists and engineers. On May 13, Loan Duy Le, Board Director, acquired 3,500 shares of Common Stock for $27.5688 per share. Following this transaction, in which he spent more than $96.000, Mr. Le owns 69,852 shares of the company. Amongst several other prominent investors of National Instruments Corp (NASDAQ:NATI), we can count Chuck Royce’s Royce & Associates, the largest hedge fund shareholder, with 5.99 million shares, and Tom Henwood’s Omt Capital Management, which declared in its latest 13F form,  holding 271,850 shares of National Instruments Corp (NASDAQ:NATI), up 2% in relation to the previous quarter.

National Instruments

Second in this list is KEYW Holding Corp. (NASDAQ:KEYW), a $386 million market cap specialized provider of mission-critical cybersecurity, cyber superiority and geospatial intelligence solutions to US Government defense, intelligence and national security agencies and commercial enterprises. The company saw two insiders purchase its stock this week. The first one was Leonard Moodispaw, President and CEO, who, on May 13, purchased 10,000 shares of Common Stock, spending more than $105,000. He now owns 334,250 shares of the company. Two days later, Chris Fedde, Executive Vice President of KEYW Holding Corp. (NASDAQ:KEYW), acquired 2,000 shares of the company for $10.76 each, and now holds 24,500 shares of Common Stock.

In addition to these insiders, other prominent investors, like Ken Gray and Steve Walsh of Bryn Mawr Capital, and Cliff Asness of AQR Capital Management hold long stakes of KEYW Holding Corp. (NASDAQ:KEYW). For instance, Mr. Gray’s and Mr. Walsh’s Bryn Mawr Capital recently declared owning more than 48,000 shares of the company.

Finally, there’s Parametric Sound Corp (NASDAQ:HEAR), a technology company focused on delivering audio solutions through its HyperSound (HSS(r)) technology platform. Although it is one of the smallest in term of market cap ($380 million), it witnessed the largest insider purchase amongst the companies here analyzed. Juergen M. Stark, CEO, initiated a stake with 40,000 shares of Parametric Sound Corp (NASDAQ:HEAR), on which he spent $350,800.

In addition to the company’s CEO, a few major hedge funds are bullish about Parametric Sound Corp (NASDAQ:HEAR). Chuck Royce’s Royce & Associates reported having increased its stakes in the company by 722% over Q1, to 205,700 shares. Furthermore, Israel Englander’s Millennium Management also upped its bets, by 23%, to 31,350 shares.

Disclosure: Javier Hasse holds no position in any stocks mentioned

Share.