Several executives committed their own, personal money to buying their company's stock this week. CNBC Pro screened for the five U.S. companies with the biggest insider buying activity over the past week, using data from VerityData. Intel — Director Lip-Bu Tan purchased 66,000 shares at an average price of $37.84 for a total of $2.5 million. Opko Health — CEO Phillip Frost bought 1 million shares at $1.27 apiece in a "high IQ" buy for a total of $1.27 million. Another notable insider purchase this week came from SolarEdge Technologies ' director Avery Moore, who bought about 15,000 shares at an average price of $70.96 for a total of $1.09 million.

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Persons: Seifi Ghasemi, Tan, Kristina Burow, Phillip Frost, Orlando Carvalho, Frost, Opko, Carvalho, FactSet, Avery Moore, SolarEdge Organizations: CNBC Pro, Air Products, Chemicals, Intel, Therapeutics, Health, Mercury Systems, SolarEdge Technologies